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Rewinding the Turnigy Rotomax 150cc BLDC to lower kV
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- Опубликовано: 18 янв 2016
- Description of how to reduce kV from 167 to 64 and 109 by increasing number of turns from original 3 to custom 5. Motor will have lower rpm and higher torque. Can drive propellers with bigger diameter and higher efficiency. More suitable for hanggliders and the E-Help system.
Many Thanks! Top tip - A few drops of acetone on the motor base screws will dissolve the cyano glue locking them in place, avoiding the oven step which could harm the magnets.
I know. Found out after some time. Also tipping a soldering iron just on the tip of the screw will loosen the CA
Just a tip, if you stick your armature on a thinner rod (than the axle) which is affixed horizontally to something, then find the end of the wire, loop it over something above the position of the armature and then simply throw the end with something heavy over your balcony, you'll unspool the thing faster than you think. Plus, you get to keep the wire for other things. Works up to one mm wire, after that, it simply doesn't bend anymore and you have to pull it.
É muito bom
My father told me the UK used to have many rewinding and battery repair shops when he came over, mid 60s. He got his beetle dyno & Datsun 120y rebuilt, the last shop I knew off run by a very tall Irish guy closed about 2003/05. Great work btw, looks very fiddly
WOW, that’s impressive I really wouldn’t know where to start apart stripping it, this is where matches comes handy I guess, impressive video.
Thanks :-)
Very impressive.I don't understand the details and would never try this myself but I hope such devices will be available commercially.This could revolutionize HG as we know it.Thank you for doing this Reidar.Please don't stop, your work is showing the way for many people.
Well, phg will probably never revolution to the sports. Its expencive and demanding ground handling. However, for the dedicated pilots it is the true and real motorglider for hanggliding. No theory, my flying time last 3 years have been increasing a lot due to electric assisted thermal hunting
any demand for powerful bldc motors, our company can provide more choice and customized service service for you
"I don't understand the details...." He electrically/magnetically "geared it down". And did a bang-up job doing it.
@@AcrodesignerLNSNI hi
Love that tune! Also the cat-Scan was very positive... any video that have a cat make things really great!!
reat!!, what i was looking for and excellently explained for people like me, newbie in the electronics
Thanks :-)
HERB ALBERT. MY MOM LISTEN TO THIS..BRING BACK MEMORIES
Thank you for having real music, a lot of the other RUclipsers use really annoying music.
Rewinding for paramotor. This is the channel I'm looking for. Subscribed.
I have built an E-Help for paraglider with this motor and setup.
I admire his confidence, and the tune makes it look easy...
Beautiful mate! Loved the music. Also good to see you gave this thing a cat scan before running it up ;-)
HA HA!!
ruclips.net/video/1Uv4d_WkkOc/видео.html
what an awesome job done here. Lots of work but good results.
You sir have both balls and skills....
What Is Islam?
Islam is not just another religion.
It is the same message preached by Moses, Jesus and Abraham.
Islam literally means ‘submission to God’ and it teaches us to have a direct relationship with God.
It reminds us that since God created us, no one should be worshipped except God alone.
It also teaches that God is nothing like a human being or like anything that we can imagine.
The concept of God is summarized in the Quran as:
{ “Say, He is God, the One. God, the Absolute. He does not give birth, nor was He born, and there is nothing like Him.”} (Quran 112:1-4)
Becoming a Muslim is not turning your back to Jesus.
Rather it’s going back to the original teachings of Jesus and obeying him
@@ahmdabdallah5811 hail satan!
caspar valentine agreed
BEST MUSIC EVER!!!
not this annoying what-ever power sounds ...
BRAVO!
Just a comment from author dated august 2017: since the video was made I have increased the number of strands to 12 for the motors intended for flatland start and use of the Menz 34x14 prop. The space in the stator for 12 strands is pretty marginal so it requires skills to compress all that copper. However, then You have probably the most optimal hangglider electric motor on the planet. Relatively small and lightweight compared to the bigger disc motors. And will at 52 volts and 140 amps spin a Menz 34x14 prop producing thrust enough for flatland launch of a 80 kg pilot on a 155 sq feet glider.
This what I like to see men do! Cool DIY bro
Do you sell those motors
Correct me if I'm wrong but that's about 40 percent better efficiency?
@@dominikknapik7990 i think mostly about larger prop at slower rpm to increase propeller efficiency (with help of lower kv to keep Volts higher enough and for Amps to be low enough within consumer ESC range). Maybe there's something how to increase motor electric efficiency at lower rpm too, but dunno, would be interesting to hear (maybe: star vs delta winding?)
Thank you for posting and not just because it’s Thanksgiving Day. Happy thanksgiving btw.
Thank you for posting this inspirational video and extremely informative. So much very good information in the comments!
That's the Cutest Cat Scan I've ever seen.
Sasha is a very nice workshop mate. He is now 8 years old, an russian Siberian allergic free cat. This Siberian cats does not have the enzyms in their spit and fur that triggers allergic reactions. My son is allergic to normal cats but not this one.
Well, Sasha IS the BEST Cat in the world to have...You're family is Very Lucky to have Him.
Sasha is now 7 years old and becoming more and more cozy. Siberian.
holy crap this is a ridiculous amount of work
Hobby Fun :-)
I am not interested in HG at all but I am into RC. I love the video, it's a great semi-instructional video. I can see me referencing this in the near future just because I have some smaller brushless motors that have to be rewound due to burning out. Thx. I am now subscribing
You have so much free time
Ha ha. Maybe true. Or not.
2:15 This is the moment when mom decides to come in without knocking.
At least your pants are on
Yeah not the absolute worst occasion
Ha ha... -could easily be worse stuff on the screen :-)
Awesome video, also the music is way better than the stupid/crazy free audio junk from youtube. Great job !
I bow to your genius. Thank you for the great video :)
Great cat! We have seven of 'em.... three of which are of immense help in my shop! At least they think so. :)
+SagaSeaCraft Lots of cat hairs in Your house ?
i also like to work with cats...nice video
très beau travail. vous avez eu de l'aide sympathique sur ce projet ;-))
Holy smokes man you're a glutton for punishment! Nice work though! Musta been one heckuva relief when the phases all had the same back EMF and the thing finally ran!
I, for one, probably would just 'cheat' and build a gearbox for it instead :)
I have built many many motors after this and all but one ran nicely. The one that did not run well was because I had shorted a wire against the stator iron sharp corner. Had to redo the whole job. Beer while making the motor was a factor there... :-)
@@AcrodesignerLNSNI Beer is frequently a significant factor. At least you were dealing with electric motors and not firearms :)
I bet you make a mean guitar pick up.. lol
but seriously thanks for posting all your e help. I think you are awakening the HG world to new and better ways to expand the sport.
Its dead simple. If you have a propeller say a 32 " diameter one for example, and say you have a 130Kv motor and your run it at 70V to get maximum power then the blade will spin at 9100 rpm. That means that the tips are totally supersonic and it's really inefficient. So to bring it to just below Mach 1 you have to run it at 60V which means that the motor is running at about 60/70 or 86% of its peak power. In fact its still quite inefficient and if you said that you wanted the tip speed to not exceed M0.7 to avoid compressibility losses you would have to run it at about 5600 rpm so you are now down to 61% of max power i.e 43 V. If instead you decided to use an 80kV motor then at 70V its running at 5600 rpm so its the sweet point. As Power = Torque x Omega where Omega is the rotational speed. So in the low Kv case you are running max power and in the 130kv you are running 61% of max power. For the same rpm the lower kv gives you a much higher torque. It's not about electrical theory and winding etc it's about matching your motor speed as close as possible to the rotational speed you need to operate whatever you are driving for it to be at its design point. If you geared the higher kv motor so it drove the propeller at the speed you wanted then there would be no difference.
Excactly.
OMG i would love to have this motor on my electric longboard, imagine the speed it could go and how steep hils it could climb, i bet it could go up a skatepark halfpipe :D
Naz95K Ha ha. On a longboard instead of D config go Y (star) and it goeas from 105KV and 4800 rpm to 80KV and some 3300 rpm. Probably go direktly on the longboard wheel. 7 kW or almost 10 horsepower on a longboard brobably would be a blast 😂😂😂
@@AcrodesignerLNSNI yeah too bad its expensive to make or buy such highend stuff, having that much torque would be cool, you know before i bought proper motors and belts etc i atached 4 drone propelors to it just to go faster downhill. Scary to ride on but so much fun
Reidar my friend !!!! Congratulations for this chanel !!!!! Very Good !!!!
Thankyou Rabi in Brazil :-)
What a beast
What are you using to control the speed control?i see something on your harness but not sure what it is or where to get one. Thanks for your time spent helping everyone!
This days use a wireless from RC cars suystem
Nice video
im misunderstanding something from the description, are you using LESS turns per spool on the stator or MORE ? And this allows lower rpm but more torque to drive bigger propellers with more efficiency?
More turns. The original 150KV has 3 turns per pole. Mine has 5 turns
As a rule, what about the old winding are you attempting to improve? The wire diameter? The turn ratio? What's your sliding scale so to speak, as in "fewer turns, thicker wire=more torque but higher current?
If I want more torque, what do I lose as far as P.I.E.R.
Great instructional, I am impressed.
Lower KV
Holy snail! Awesome! Congrats!
I love that motor
Great video, very interesting and informative. Good job.
Beware of oven temperature overshoot, may kill the magnets.
Best to wait say half an hour or so for temperature to stabilise.
Today I just blow the old windings with a heat gun for loosening the resing for just the reason U mention
Well, loved the content as well as the music
Hi thanks for sharing your project. I have just purchased a turnigy 150cc equivalent motor and 32 inch prop. I don't intend to rewire it but I do have a question for you if you would be so kind as to answer. Do you think the standard bearing system is safe from the factory. I was considering running the motor inline with secondary high speed bearings in bearing retainers inches of the factory system failing. Would rather not have the extra weight. Just wondering what your thoughts are on the standard factory system. Thanks Darren
Running a bunch of this motors since 2013 we never have had problems with bearings anytime. Even rough dissasemby and tinkering, propeller strikes and mishandling. My thinking is that as designed for RC model airplane usage, were small crashes, landing mishaps and nose overs are not uncommon, the motor is built quite robust. On my geared version I even put a belt driven sprocket gear direct on it with all the side forces that represented. Ran flawless for many years. I don't think You should be worried about those bearings
@@AcrodesignerLNSNI thanks so much for your reply. Just waiting on a bec and I will be ready to wire it all up. Already built a mini ppg carbon-kevlar frame and installed the motor, esc and made fire proof battery bags. Excited to get it working.
HI! congrats and easily the most interesting brushless mod on youtube. You wrote 6kw at 2.5Amp p er kg. I assume its 50v so that means you got 48kg of thrust with the 64kv mod! that is an insane thrust efficiency. would you please say if that is correct? thank you!
Salute 👨✈️
Did you build your e-help system? How did this motor work out? Still using it?
Hello, Yes this motor flew for many many hours. Built many more since. Alsoother KV's
I was faced with similar problems on my electric hang glider project but instead of rewinding the motor (I lack the skill!) I decided to use 2 motors running at reduced power instead. I run the stock Turnigy 150 motor with Xoar 30x12 props and climb at 5-7KW per motor (51.8V, 100A per motor.) Because there are 2 prop discs the prop efficiency remains high. The only downside is the weight and cost of 2 motors and controllers instead of one.
Yes, the reduced disc loading from two slow props will give good efficiency. How is the two motors arranged, trike ?
I saw your electric powered Millenium video. Very impressive !
Reidar Berntsenkkil1pqplq
If You look at another video on my channel showing the twin engined "Fugly" You can see two of this rewound motors with 34x12 props driving my big tandem glider with big wheels and tailwheel. Almost like a small ultralight. It was an experiment to try to obtain the lowest possible disc loading prop efficiency and see what performance that came out of that. It showed pretty good efficiency for the drive train. Two motors each pulling 70 amperes and producing 22 kg thrust each driven by one common ESC (Turnigy Dlux 250A) worked pretty well. It was a fun aircraft to fool around with at the airfield. However, the air resistance when gliding engine off was awful. It glided like a manholde cover and I soon named it after my instructors dog "Fugly". Which means fucking ugly. My goal is not to make an electrical ultralight, it is to use electrical to reach thermals and then soar away engine off.
Hello Reidar, do you think the tmotor prop G40x13.1 could be good match for this motor. rewound or not? thank you
Magnifique. .travail fait avec grand soin...👍
I don't even know what you said but I know it means awesome...
Interesting
Hello,
I am curious what ESC, Flight Controller, and props you would use for those motors? Batteries as well please? I am looking to build something with 4-6 of these motors to lift myself off the ground.
Also great work on the video, the synchronizing of props was very impressive.
The ESC is the Turnigy Dlux 250, prop is the Menz 34x14. Copper wiring we use 12 srrands of 0,6mm2 this days to get higher copper filling. For flatland start the E-Help is at 35 kg thust at 52 amperes (14s) and 122 amperes. Actuator is a RC control for cars
Reidar Berntsen 14S? You achieve this by LiIon, custom LiPo or what configuration of OTS batteries?
@@muntee33 off the shelf 14s lipos
@@AcrodesignerLNSNI Dear Reidar, Im in Sweden! you have such an amazing configuration in your video. Could you please enlighten me on your last specification at 08:40 : You wrote
6kw, 2.5Amp /kg. Which means: 6000watts / 52volts = 115Amps which means:
115amps/2.5amps = 46kg of thrust!!!!! is this real? you mean you got 46kg from 6kw? could you please clarify Reidar if you achieved 46kg, or what exactly kind of thrust did you achieve with 64kv. Thank you so much!
@@AcrodesignerLNSNI wow! 6,3kw for a massive 35kg of thrust! MOST impressive! Was that in delta or in star?
very impressive
Dear Everyone, we freerchobby can provide more powerful motors with any customize kv, even very lower kv to 10kv around. For our motors 12090 15kw, 120100 25kw, 15470 35kw and 154120 50kw are very suitable for any electric paramotor, paraglider and mega drone usage. Any interests, just let us know!
wire area 0.6 mm^2. you gave area and not diameter. that's 19 AWG and diameter would be #23 AWG which is what u used. thanks for the great lesson in winding a 3 phase motor.
Wah kalau untuk dijadikan pesawat terbang kira kira bisa di naikin gak ya
Salam sukses selalu Bos ku....
Where did you get the 3 bladed foldable prop?
Rasa
Great Video. How many hours did it take to re wind one motor? I have a rotomax 50cc and would like to lower the KV. Probably wont do it after seeing how much work it took for you to do :)
Luke Q Total 10 hours if pro and have got all parts available.
How long did this rewind take you Reidar ??? I like this method of rwinding with all your steps. Job well done fella.
I liked and subscribed for the cat
so cool would like to try this motor on ebike
it was a great job.perfect
Great video thanks.
Are not two bladed props more efficient than 3 blades.
Yes, two blade is more efficient mostly due to the better aspect ratio. However, in case supersonic tip speeds are an issue then a 3 blade can be the solution going with a smaller diameter thus smaller tip speeds. Could also be that more blade area is desireable then a 3 blade
Reidar Berntsen paddle blades...
@@Surferant666 Paddle blades have low aspect ratio and high induced drag
@@AcrodesignerLNSNI where did i mention paddles?
i love the music,,,, old british tv
nice
Funny unit amp/kg thrust. 34x12 has way less pitch and less rpm, way less efflux. I assume you will be moving at a speed regardless of what this motor is used for so efflux makes a great part of it too.
btw its an e scooter name speedway 3. max speed tested is 55-60km/h.
What is the website for the winding diagram calculator? Thanks.
www.bavaria-direct.co.za/scheme/calculator/
Nice bro
Great work and video! Small question. How did you determine the length of the wire and how many times you loop it (5m x 8 loops in your case) as well as the wire AWG? Im working on a 3 phase motor completely from scratch and would like to know if you have formulas to answer my questions or did you figure it out from the original windings?
I had no formula. Just did by cut&try. The 105KV motors that dominate the E-Help world this days are 12 strands of 0,6mm2. Nice to work with flexible and good copper filling. Just did a 88KV version with 6 turns with 10 strands of 0,6 mm2 wire. Run tests on a series of pitch parameters on 34 inch diameter props. Obvious is way below tip speed transonic issues. Efficency increase. However, top thrust is below flatland start. Looks like we have got the supercruiser, KV88, battery 52 volts, prop 34x16 inch
@@AcrodesignerLNSNI hi, great video. Who can give me advice to speed up motor, need less turn wires on stato, but bigger wires?
Dear Reidar, the perfect work! Congrats. what is the best eff, for the 34x12 in delta or star? Does the 2.5 amp bring ca 7 kg/kW? with 34x12? Best Winfried! PS we are considering the Rotomax again for commuting craft with wings!
Hi Win, I this days only use it in Delta. The star coupled HT (High Torque) version of E-Help was sure pretty efficient but the 3300 rpm swinging a 120 cm diameter prop proved a bit unpractical for hangglider. Affected the handling a bit and doesent fit into my Toyota Prius Plugin. The efficiency was good. However, cooling the motor was a bit demanding at that low rpm high torque. Think it was pushing the motor physical dimensioning a bit too far. The HT achieved some amazing low 2,5 amperes at 52 volts to produce 30 kg thrust. But only for limited time as the motor became very hot. Cooling is from rotation working as centrifugal pump. So HT was only for cruisefrom hill launch, not flatland start. Even thoug I once did flatland start with it. Did not like it. Same motor in Delta with some 5000 rpm plus on a Menz 34x14 prop proved way more practical and nice for hangglider. At some 120-130 amps it produce 35 kg thrust for flatland takeoff seen on another R&D video at my channel. That is efficency in the 3,7 amperes per kilo thrust. When throttling back for cruise the efficiency was better as the disc loading decreased. And no cooling problem, can stay on takeoff power all day long it seems with copper size total 7,2mm2 as it was wound of 12 strands 0,6mm2 wire.
intelegent
What size are those little hex screws , I want to change the neck support for the propellers and I need to open the part you just placed on your bench ,I appreciate your answer mate 👍
Great work! What is the maximum thrust you can get out of the folding 3 blade prop?
My rasa 34x12 three blade foldable is about 28 kg and I only use it for motorgliding form hillstart. Not for flatland start that requires about 34 kg thrust to do it safely with my 85 kg pilot weight
The same technique that I employ during modification of e bike and drone motor
Не пойму, в оригинале мотор был мощнее? Или он свой подписал как оригинальный?
profesonal
What is that stator made of. And if i want to build myself a stator what should I prefer
hi there im using a 600w brushless motor hub, running with 52v 26a batt . what must i do to make it faster, less hotter and batt consumtion reduced or maintained.. currently it can withstand 5-6 hrs ride at average of 25-30km/h with intermitent trotteling
Well. To take out more power it produce higher losses, about 2-3% of the output power go to heat. High rpm produce higher iron losses but also better cooling
i wish someone could make my dream come true, a quadcopter with 4 of those babies :D
Quadcopter eith this ones has been done in the onemandrone.com project. Actually 12 of this motors. However, upscaling drones from model airplane size to full size able to carry a person meet some hard laws of physics. Demanding to get some useful endurance and range with that low propeller efficiency. Increasing prop discs and prop efficiency, well - then you move towards helicopter design
Can I ask you which is the best prop to use for the rewind setup? You used a foldable RASA 23x12 3-blade prop in the video in Vinessla Norway. The rewind video recommends a larger diameter prop?
Its a Rasa 34x22 foldable 3 blade
This was very fallout 4 crafting style i felt
👍👍👍👍👍
I thing if you make a electric jet engine with this it would be awesome ..
Hope you try it
Efficiency of an electric ducted fan is very poor. Lots of amperes for low thrust. Need big prop disc, low disc loading and tip speeds at about 0,6 Mach to get deasent performance and efficiency
Hi, very qool video, can you explain - how is possible to increaser kV with this same voltage ? more wire / more turns ?
seems a lot of effort. did you try the alienpowersystem 12090 brushless motor 50kv?
Hobby is to make stuff. Not the easiest. But much more fun
could you please tell me where you got the skema for the motor winding ? I can't find anything like yours
There is calculators for motor windings on internet. This is the one I use www.bavaria-direct.co.za/scheme/calculator/
More great work from the master!! Thanks Reidar for all your ReD. Am working on the gear drive e-help system and would like to know your new LiP battery source. Thanking you. I amDanny
Hello Danny. My source for 7s 6000mAh 60C LiPo batteries is norwegian model airplane vendor www.rc-batteri.no. However, main reason for selecting this vendor is logistics. Shipping LiPo from China to Norway has become more strict and this company do all that stuff for me. Any LiPo at this big size and spec will do the job. The old direct driven E-Help was brutal to the batteries pulling some 160 amperes for tiny 25 kg thrust. The gesred Mossie is kinder to the batteries producing 35 kg thrust at 120 amperes. What I see with the rewinded motor that in delta and with a cheap wooden prop 34x12 it produce 25 kg thrust at 90 amperes. This means that endurance is close to doubled for the direct driven E-Help.
+Reidar Berntsen ,Thanks for the info. I had one other question about the gear drive. You show T10 size on the picture of the XC version. Do you think the T5 size of cog pulley with a 25mm wide belt is big enough if using the soft start on the ESC? I was going with 18t x 60t for 3.43/1 ratio with 50x28 folding prop.
Thank you
Danny
+Danny Young T5 sounds a bit small. Once calvulating the Mossie even the T10 was marginal
+Reidar Berntsen I was thinking the same thing so I went with the T10. Thanks again
Danny
+Reidar Berntsen ..Thanks VERY much for your generous rewind video of the Rotomax 150! Danny and I are flying buddies and we both have been waiting for the Rotomax 150 on backorder for a month now. (we are both 66 and knees are bad) We are not sure when they will come, there must be a LOT of people wanting one? Danny wants to build a reduction drive but I am not sure I can do it. I was wondering if I could pay you to rewind one that you have or sell me one that you already have rewound?
Hank
Hello Im chris from HobbyKing, I'm developing a PPG setup we have the 150cc in lower KV and can do custom KV FYI
Hi Chris, you've got my attention. Can you elaborate please? Perhaps drop me a PM.
Hey Chris...could you do a custom wind on the turnigy ca 80 80 10 160 kv to get 60kv for e bike application and would there be additional cost?
Looking to mount the motor into the bottom end of a small 50cc bike engine with a small EDF unit for forced air cooling.
My plan is to replacing the crank with the electric motor turning the clutch basket with a small chain giving me 6 spd trans.
Also would dropping the kv down to 60 allow for an increase in voltage to say 72v?
Thanks.
Chris I want one for my paraglider can you email me more info dwight_leiss@yahoo.com.
Hello Chris, are you still about? Your comment has generated some interest but you don't seem to have noticed. Please would you let us know what you can offer?
You made a good work, good enough to not need a cat to got views ;)
Herp Alpert ó Al Hirt músic very Good.Caracas Venezuela.
Hey Reidar, thank you allot for the very informative videos. So when you rewind from 3 to 5 turns did you end up with 64 or 106 kv? I have to rewind my rotomax 100 and want to reduce the kv by 1/3
Thanks a alot. Greeting Julian
In Delta it will be 106KV and in star 64KV. I flew it with 64 two years ago I think there are videos of Pink flying with the huge propeller behind. There were 2 mayor issues with the 64KV. First of all the propeller is huge about 120 centimeter in diameter. Very good efficiency. However, the low rpm and huge torque did not produce enough cooling air trough the motor stator windings. The outrunner bell is supposed to work as an centrifugal pump for cooling air and those lumbering low rpm's did not do a god job there. So motor temps were too high when take off power at 64KV.
8:35 looks great
Hi Reidar, is the 2,5 amp/kg thrust calculated or measured? Just because I have seen another video from you there was 3,5 amp/kg thrust with a geared prop. Can be the 34x12 prop better than the bigger diameter geared one? Regards, Roland
Measured. But efficiency is not linear. At low loads like 10 kg thrust the efficiency can be good at 2,5 A/kg. Increasing the rpm and thrust the maximum disc loading kicks in and efficiency drops off to 3,5 A/kg. Asking a small 24 inch diameter prop to produce 26 kg thrust then efficiency is 6,8 A/kg. Mossie at 52 inch diameter prop produce same thrust at less than half the amperes. All props have their limits how much thrust they can produce - disc loading and blade loading, aspect ratio on blades must be considered
Hi, thanks for the explanation. So it can happen that for example an 36x10 prop on lower thrust (maybe 20 kg or so) is acceptable efficient and is no necessary a bigger (50-52 inch) prop? I'm asking because I'm building now an "thrust assist" unit for paraglider. First I only want to start from hill and have 0 vario with the motor on. I made a folding prop with 51 inch diameter wich seems to be ok but I find it a bit heavy (not flying yet first test is coming soon). It is worth to make some test with smaller props ( I have 30x12, 32,5x11 and 36x10 here) on low loads (15-20 kg)?
+Roland Falusi Yes, for only 20 kg thrust a 34 inch prop will be efficent in the 2,5 - 3 amp/Kg range at 50 volts
+Roland Falusi Yes, for only 20 kg thrust a 34 inch prop will be efficent in the 2,5 - 3 amp/Kg range at 50 volts
@@AcrodesignerLNSNI Aha now I see! Im reading your old comments here:) so 2.5A applies not up to 6kw but at low disc loading. good! but still 180w/kg--6,3kw, i.e 122A at 52V at 35kg thrust for 34x14 propeller is the most efficient propeller system I have every seen in my entire life and I am a home DIYer. on eCalc it says the thrust is much lower
Надо Игорю Негоде показать...
dammit! why did i spend an hour watching all those other vids about rewinding a motor before i clicked this one!? 😩 impressive work man!👍 could you tell me how you made that layout drawing of the windings you were using? and which online calculator you used?
btw that jingle is freakin brilliant 👌😂
Linktw0 Thanks. The calculator used se the link I posted in a comment about one month ago. bavaria-direct.co.zu something. See below. Regarding the jingle. Everyone that grew up in Norway in the 70 and 80ies know it because it was used by the only tv channel that existed at that time (yes - we had only one national tv channel). And it was the jingle going when a famous tv cook had the food in the oven. Hence the beginnings with two motors in the oven
www.bavaria-direct.co.za/scheme/calculator/
Jesse Fritz Yep thats the worlds one and only piece of documentation about custom wound motors! haha sadly, it is probably true tho... But its good, I was able to work out how to do my ø13mm x 6mm high stators that have the classic "cd-rom" modded 9teeth stators and with 12 magnets in the bell.
my original 0.1mm wire was wrapped 22 times forvthe 3300kv they gave me, but a tiny bit of S4 powah burnt those tiny 1306s immediately at full pull. But now i rebuilt the set based on 0.2, 0.3, and 0.4 diam wires.
🤓🙌🙌🌈yay
I wish they had a calculator for both in runner and out runner.
uff Nice job... excelent
Can it be used as electric generator? Do you know what it generates if turned mechanically with 65rpm? This is a golden mine if works!
Yordan Velikov 65 rpm is too slow to produce any useful kilowatts. 4000 then 7 kw about
in the original config. of the motor what re the caliber of the wire and hhow many turns have? because i want to do this motor with the original configuration but i need to know this spec, so please if you can tell me i would appreciate
The original 150 KV motor the stator has 3 turns around each of the 24 poles and connection is Delta. As seen when disasemble. The cross section of the stator winding seems to be in the area 5 mm2 on the original motor. Be aware that Hobbyking refer to this motor as something else than "3 turn" windings because they count the pole pairs and add up the windings that belongs together so I think in their world they call it "8 turn".
I like this, but would it not be easier to add some transistors in parallel to the existing ones of the h-bridge, swap the transistors to bigger ones, or take out the transistors and add a substitute h-bridge board to the ESC? At least if the batteries can supply the current, that should be easier.
Two words for you "Tri Pod". the head mounted camera gives me motion sickness.
Sorry for that :-)
were comes the noise from the brush-less motors?
From the PWM switching frequency
what method do you use to lock the propeller so it doesnt windmill when the power is off in flight?