Fixing the HobbyKing pulsejet (part 1)
HTML-код
- Опубликовано: 9 фев 2025
- The HobbyKing pulsejet is a super-cheap engine but there have been some issues which seem to boil down mainly to quality control and manufacturing tolerances. In this video I look at the variance in fuel atomizers and get ready to try and run the engine with a replacement atomizer.
Once the engine is fixed, it will be going on my Mini Talon RC plane and we'll have some real fun!
If there is one thing you can count on it's the weather!! Really looking forward to see how this project turns out.
great video looking forward to part 2
Thanks for sharing
Aaaaaah I've been waiting for sooooo long for this
Love it, more pulse jet stuff would be awesome :)
I piddled with some control line jet speed as a kid... c. mid to late 60's. As I recall, 'flowjector' assembly quality varied a good bit between individual specimen... as I suspect they may now. Dyna's were an order of magnitude better than OS Max, but still so so. You very well might need to remove and re-position the start tube. check around on the web a bit... I recall reading and/or seeing where some modern day hard core types now use removable start tubes. Also, check the chamber and pipe welds for pinholes (soap bubble), along with the head to combustion chamber and spark plug connections... they seen to be amazingly sensitive to even minute leaks.The aluminum reed valve seat surfaces too... lots of lapping is often needed to keep those cleaned up. Try to minimize as much as possible ground run time... and they run very much cooler on alcohol fuels as opposed to gasoline. Oops, almost forgot, leaking taper seat sealing surfaces between metering jets and flowjector can also be an infuriating source of issues... all said and done, they're really fussy about any and everything imaginable. Oh, and don't run them in the house lest you'll annoy kitty...
I swear to fuck if we dont get a part 2
+Huckin Fackerz Me too! It's still raining this morning but supposed to clear around mid-day. Stay tuned!
+xjet I'm concerned the Pulsejet will melt the Aircraft.
Ifodder It will be perfectly fine on the outside, especially with reflective tape
lol dude chill .. like the fly
What Summer? We had snow on Mt Wellington yesterday morning when I got up and that front should be at your place right about now. So put on your Santa suit and go ride in a pulse jet powered sleigh. Oh and call your pulse jet Rudolph, 'cause it really does have a red nose!
Looks like a UK summer, which is exactly why I retired here to Fuerteventura
Part 2 :D
+BMSWEB Prob waiting awhile for that LMAO :-)
+BMSWEB xjet and RCModelReviews part 2s are basicaly same thing as Half-Life 3...
+xjet good to see a non drone/quad video again.. maybe get more into EDFs ?
I drilled the fuel metering hole to 2 mm and the spray bar holes to 1.2 mm. It now runs great on ethanol.
I may buy a pulse jet looks pretty cool. You should have a look at the 3 axis gimbals for the 9xr and 9xr pro and let us know what you think
you sure the smaller holes aren't from a worn out drill bit and the angle is from crappy QC
Check! Dont mount the pulse jet to wood, OK. But foam is alright?? LOL Thanks Bruce ill be looking forward to seeing the results, Keep it up!
The HK pulsejet owner comments (reviews) for this would probably be helpful in getting it working. For some reason, HK's site doesn't indicate the date a comment was posted, only the date a reply was posted.
manufacturing tolerances are pretty wild :)
hi, I have a hk pulse jet also, I wonder if it is possible to internally
fix this engine in a jet made of vibrating, of course with the
necessary modifications? since already grateful
:) I believe in you mate this will happen !
Must take ages getting the Xjet & Rcmodelreviews studio's looking the same ;)
I tried in my last video to get my HK PJ working.. Total fail and I lost about half a litre of fuel. The air pipe broke off mine a long time ago.
So for the fuel you can just use petrol? Or can you use alternative fuels such as alcohols?
Luke Shaw I would think kerosine would work the best as it burns when atomised along with it being basic jet fuel because of this and in my opinion it burned with more force then Petroleum
Mine used to burn reeds constantly until I tried burning 32 to 1 two stroke mix. I have it on a plane and havent burned a reed in about the last dozen flights. Used Pennzoil oil
Xjet where's the best place to buy a pulse jet i know this isn't the best one but should I buy this or different
Which spark plug you use in
Awesome
More... by the way, just out of passing interest; Dyna is still more or less in business, but hasn't produced model engines in eons now... see the 'About Us' link here:
www.dynafog.com/
U Mention on Occasion Tyme Life of this type of Propulsion. What is a Reasonable Life Expectancy of such an Engine & dou they Loose Efficiency as per Hour of Use ? YYZ-Planker.
part2: Fire in the whole! upload fast please?
The Red Head & Main jet are the only good parts.Pipes crack open & Flowjectors still no good.
☺
Tesla Value? Have you thought of using a Tesla Value that has no moving parts to wear out in a pulse jet? The greater the back pressure the greater the resistance. I 3D printed one then fill up a balloon and it held the back pressure from the balloon very will.
I suppose you would need a dozen medal Tesla value in parallel to get enough air into a pulse jet. Just food for though..
+Serafin Tirado Unfortunately the Tesla valve is too "soft" to be any good. Tesla valves work fine with a constant flow but do not handle pulses of pressure very well at all :-(
Ok .i see you already look into it.. very good young men.
This is one of the reasons why your Chanel is not going that good, makes a short video and makes them several parts. For more profit.
Don't do a part 2 please.