@jetplaneflyer Yes, it is hard to really SEE a difference from watching the video, but I can assure you I really felt the big difference when I was flying it in person. We've flown alot more KFs over the last couple years and its just confirmed our same general results. KF1: We don't like it, wants to flip the plane. KF2: Our favorite. Best balance of strength, weight, speed, stability, etc. KF3: Never use it, just gives too much lift. KF4: Super speedy and maneuverable but added weight.
When i built your Extra300 i used to thin foam. I glued another layer of foam on top of the main wing to reenforce it. Suddenly it wasn't just rock solide, but also very stable and faster. Seemes like i randomly created a KF2.
this looks like quite a good thing to look into for a UAV i am gonna build to get plenty of lift for lifting cameras and other experimental control equipment
Actually the "control" is a term used for science experiments in general (that's what most textbooks call it), it's simply the test with known results.
You rock Dave. I just graduated, so now I have time. Once I get the income thing dialed down, I'm gonna get into RC Planes, with your work as a major source. Hey! I'm also an INTJ! Sweet! Maybe if we correspond you'll undertand me instead of thinking I'm a martian. :) Thanks for your work and your passion.
Love your vides, hope you get syndicated some day and start an RC cable channel. We're sick of the food channels and home shopping channels. Consider stepping up to high-definition uploads, the future is here now.
Dave that's really cool! You have inspired me to put one of those on a Yak I have and I'm gonna test them, too! I love following your work and can't wait for the VTOL project!
Yet another top video Dave and i just love all the info you give out and look forward to the next couple of videos about how to set up a gyro to your r/c plane,what xmas present mate lol,thanks Dave and you are the Man 5*
I don't see that particular plane on your site. It has a delta-wing and canards like your Eurofighter, but it has side intakes with the canards along the top, like a JAS-39 Gripen.
@nolifewithoutrc10 I use the KF2 on everything these days. All around, my personal favorite and the right balance of everything for what I'm looking for.
Good work.. what we need is more testing on the effects on some other airfoils.. Glad the KFm4 came out well, Ive used that on a zagi type and a delta and for me it gives the best of both worlds..the trouble with all our testing is that its subjective.. but the more who give it a good result the more the doubters will be convinced...davereap
@marner94 Most of the videos around this time were all related in some way to the F-35 VTOL project. I believe the KFm3 was used, as it provides the most lift.
They all looked pretty much the same to me apart from the bottom step airfoil which flew pretty bad all round. In fact the first (flat plate) appeared to be fastest visually. One thing that might have skewed the test was that when you added the KF step it extended well in front of the leading edge and so increased the wing area by a big margin.. that would explain any better slow speed capabilities.
This vid is great! Just like your X36 no tail vid it's really interesting to see what you're doing with these things. Can't wait to see the vertical take-off project. :D Keep it up!
Good Stuff Man!!! Great video...Looks like the KF airfoil could help my project too...been working on a Delta Foamie thats looks similar to yours with the carnards and all, but has dual rudder - the next test was to try different airfoils to keep it stable at high alpha and without losing speed...Think I'll try this KF and see what happens. You guys do some of the best "Techie RC-Foamie Stuff" I've seen anywhere...Keep up the Good Work. MoJo
hi! i think you should test fly the Multiplex Easy Glider Electric or Pro! these are popular in the UK and are like an expensive version of your wild hawk but with a front motor! please get one and give it a review! they made from EP fome
The last one is like a laminar flow design sorta like on the P-51 or even the B-24. I am wondering what, if any, kind of endurance/flight times or range enhancements can be expected with the KF4 design.
hi, looks veeeeeery nice! I just wonder - is this your job? are you researching all inds of stuff for rc planes for some company? or you have a job beside this? btw, you have the best vids about planes on utube.
Is is possible to add a KF4 airfoil to the F-117 build? I know there is not much wing left on the top side of the F-117, but could a little be added to the top side and bottom side to make a difference? Thanks.
Dave/Val - Please can you tell me if the KF airfoils that you added on this were made of 3mm or 6mm depron? I'm guessing the main plane is 6mm just like your other PDF plans, but what about the added on airfoils? Thanks.
I really love everything you've been doing I have learned so much from your video's. however it says you have 106 videos on youtube but I can only find about 30 from your youtube page. Also your website needs fixing (rcpowers.com) all your links are missing. Im sure everyone would love to see more.
The KF3 test isn't correct. At 5:53 you can see the rear plate is flat, the front plate goes up to 3 high, and you can see the insert. That first step down is 2 high, to a flat rear plate. Should rise to 3, then step down only 1, to 2 high, then the rear plate slope down from 2 to 1 height. A more rounded, airfoil like profile, with both steps of 1 height and a slope down on the rear plate, not flat. The 2 drop probably adds extra drag, the correct profile should be more slippery.
kf1 sucks if the high alpha is going belly forward like ur hand than its good kf2 is awesome for speed kf3 is good for high alpha thing not good for extra weight cause its already too heavy unless u have a light powerful engine but its not for extra weight kf4 is best u need dual engine spinny thingys its good for stunts and weight but u gotta tie the smal camera on tight and ad a litle cushin behind it so it wont fly ohf and drop if u make a hole underneath and put camera there it good
hello bro..your tests are really great.....even i am working on some project related to KFM...can u please send me the contact details of RICHARD (DICK) KLINE....even the email id would do...i have been trying a lot to get it but was not successful...please help me with this request...thanks....
![Kodak Black - Sharp Vibes [Official Music Video]](http://i.ytimg.com/vi/oEV0OoLJeIs/mqdefault.jpg)
This is so exciting and stimulating. I love how scientific this analysis is.
@jetplaneflyer Yes, it is hard to really SEE a difference from watching the video, but I can assure you I really felt the big difference when I was flying it in person. We've flown alot more KFs over the last couple years and its just confirmed our same general results.
KF1: We don't like it, wants to flip the plane.
KF2: Our favorite. Best balance of strength, weight, speed, stability, etc.
KF3: Never use it, just gives too much lift.
KF4: Super speedy and maneuverable but added weight.
When i built your Extra300 i used to thin foam. I glued another layer of foam on top of the main wing to reenforce it.
Suddenly it wasn't just rock solide, but also very stable and faster.
Seemes like i randomly created a KF2.
Great info! Finished product may just be the ultimate RC plane. Looks promising.
Yes, we do the product reviews when we need to fill space while we are working on projects.
this looks like quite a good thing to look into for a UAV i am gonna build to get plenty of lift for lifting cameras and other experimental control equipment
Actually the "control" is a term used for science experiments in general (that's what most textbooks call it), it's simply the test with known results.
You rock Dave.
I just graduated, so now I have time.
Once I get the income thing dialed down, I'm gonna get into RC Planes, with your work as a major source.
Hey! I'm also an INTJ!
Sweet! Maybe if we correspond you'll undertand me instead of thinking I'm a martian. :)
Thanks for your work and your passion.
Love your vides, hope you get syndicated some day and start an RC cable channel. We're sick of the food channels and home shopping channels. Consider stepping up to high-definition uploads, the future is here now.
thanks for the great test flights ! answered many of my questions !
Dave that's really cool! You have inspired me to put one of those on a Yak I have and I'm gonna test them, too! I love following your work and can't wait for the VTOL project!
Hey Dave thanks to you and the team for posting every week Loe your vides very much!! thanks!!
when i build my first foamie, i gotta use that kf4 airfoil on it. that looked awesome
keith always says "oh very nice, very nice!"
Yet another top video Dave and i just love all the info you give out and look forward to the next couple of videos about how to set up a gyro to your r/c plane,what xmas present mate lol,thanks Dave and you are the Man 5*
I don't see that particular plane on your site. It has a delta-wing and canards like your Eurofighter, but it has side intakes with the canards along the top, like a JAS-39 Gripen.
@nolifewithoutrc10 I use the KF2 on everything these days. All around, my personal favorite and the right balance of everything for what I'm looking for.
Good work.. what we need is more testing on the effects on some other airfoils.. Glad the KFm4 came out well, Ive used that on a zagi type and a delta and for me it gives the best of both worlds..the trouble with all our testing is that its subjective.. but the more who give it a good result the more the doubters will be convinced...davereap
@marner94
Most of the videos around this time were all related in some way to the F-35 VTOL project. I believe the KFm3 was used, as it provides the most lift.
Mythbusters! yay, the show rocks! and your planes are awesome man
They all looked pretty much the same to me apart from the bottom step airfoil which flew pretty bad all round. In fact the first (flat plate) appeared to be fastest visually. One thing that might have skewed the test was that when you added the KF step it extended well in front of the leading edge and so increased the wing area by a big margin.. that would explain any better slow speed capabilities.
This vid is great! Just like your X36 no tail vid it's really interesting to see what you're doing with these things. Can't wait to see the vertical take-off project. :D
Keep it up!
For parkjet guys, we have a new ParkJet eBook for 2016: rcpowers.com/community/threads/flight-facts-ebook.19237/
OMG the mirage 2000 one of my favorite fighters apart from the viggen and gripen
Good Stuff Man!!! Great video...Looks like the KF airfoil could help my project too...been working on a Delta Foamie thats looks similar to yours with the carnards and all, but has dual rudder - the next test was to try different airfoils to keep it stable at high alpha and without losing speed...Think I'll try this KF and see what happens. You guys do some of the best "Techie RC-Foamie Stuff" I've seen anywhere...Keep up the Good Work.
MoJo
Watching some of the older vids. Funny thing about his video is, you already have a KFm2 on the canards!
Yes, exactly! Dick and I talk about just that in our phone interview.
That book at the end is what I have
Hey dave I have a book of this and it has al the history and equations as well as paper planes
great job dave love the vids look forward to them every week keep up the good work =)
Pretty much they act as turbulators causing the flow to separate further back.
Cool stuff Dave... very nice!
hi! i think you should test fly the Multiplex Easy Glider Electric or Pro! these are popular in the UK and are like an expensive version of your wild hawk but with a front motor! please get one and give it a review! they made from EP fome
very very nice in my opinion airfoil 4 would be the best
merry christmas dave!
awesome and merrychristmas
Er, actually it IS the Mirage, Eurofighter has the intakes on the bottom, not the sides!
give it a golden star
Good stuff Dave!
I think that might work good!
The last one is like a laminar flow design sorta like on the P-51 or even the B-24.
I am wondering what, if any, kind of endurance/flight times or range enhancements can be expected with the KF4 design.
hey guys can you please show us how you actually make your wings
by the way love the your shows
Variable sounds like the way to go.... any chance Mr Powers will care to discuss?
Verry interesting chaps ,! why stick to the wing? what happens if applied to other control sufaces??
November 7, 2022 ,,,, Still K foiling !
Very useful info and a valid experiment right there. But is this really used for golfball aerodynamics? I mean how can you put a step on a ball? :P
hi, looks veeeeeery nice! I just wonder - is this your job? are you researching all inds of stuff for rc planes for some company? or you have a job beside this?
btw, you have the best vids about planes on utube.
that crazy i had that same idea but its more round
Always great stuff dude ;-)
listen there is a truck horn in the background
dun for get to make a protection thing for the camera underneath
Ha they finaly do, If you look its on there F-35 vtol plane
Top vid Dave and very interesting.
Hey, do you have any thoughts about setting up gyros on helicopters?
Is is possible to add a KF4 airfoil to the F-117 build? I know there is not much wing left on the top side of the F-117, but could a little be added to the top side and bottom side to make a difference? Thanks.
cool video, but what is that white thing that fly horizontally from 6:35 to 6:36 ?????
cool vid!!!
Hey, the center of gravity was at the same place during the four diferent tests ? almays the aircraft weight was the same to ?
Great!
Did you re balance the plane each time? I assume the airfoils are different weights.
wonder how a KF4 would behave in slope soaring..
what kf do i use on a glider...foam homemade glider?
wid fpv and bombs...
Yeah, that's called a "pancake" landing. :)
Dave/Val - Please can you tell me if the KF airfoils that you added on this were made of 3mm or 6mm depron? I'm guessing the main plane is 6mm just like your other PDF plans, but what about the added on airfoils? Thanks.
hey dave i was wondering with the vtol on the f-35 are you going to have gyros hooked up to thrust vectoring motors to control it in hover?
i have your mig 29, i was wondering which kf airfoil i should use.
It looked Like there was a KF4 on the canards.
What if you put a double step kf airfoil on both sides?
it's not mirage 4000, it's eurofighter thyphoon.
I really love everything you've been doing I have learned so much from your video's.
however it says you have 106 videos on youtube but I can only find about 30 from your youtube page.
Also your website needs fixing (rcpowers.com) all your links are missing.
Im sure everyone would love to see more.
hey man, could you just tell me how to find out the "S" in the lift formula? and what is a midspan airfoil?
I LOVE MYTHBUSTERS!!!!!!!!!
Could the KF3 be used for slow flying because it generates more lift at lower speed?
Keith looks like santa
The KF3 test isn't correct. At 5:53 you can see the rear plate is flat, the front plate goes up to 3 high, and you can see the insert. That first step down is 2 high, to a flat rear plate.
Should rise to 3, then step down only 1, to 2 high, then the rear plate slope down from 2 to 1 height. A more rounded, airfoil like profile, with both steps of 1 height and a slope down on the rear plate, not flat.
The 2 drop probably adds extra drag, the correct profile should be more slippery.
nice!
is this out on the market
just a passing thought does keith kinda look like santa clause i do not mean any offense in any way just a thought
Even though this is an old post, do these KF airfoils shift the CG (or aerodynamic Center of lift) too?.
Mythbusters?
What about the other KFs
what KF airfoil to use on F-35?
Combine kf 4 and 3 and it could lift more be stable at higher speed and be more stable in high alpha
Do you ever have a "White Christmas"?
Ok did you buy the kf airfoil? Or did younmake them???
can i have one of this cool planes?
7:51
Crosswind landing?
@MrFenderStrat7 Val made that noise.
kf1 sucks if the high alpha is going belly forward like ur hand than its good
kf2 is awesome for speed
kf3 is good for high alpha thing not good for extra weight cause its already too heavy
unless u have a light powerful engine but its not for extra weight
kf4 is best u need dual engine spinny thingys its good for stunts and weight but u gotta tie the smal camera on tight and ad a litle cushin behind it so it wont fly ohf and drop if u make a hole underneath and put camera there it good
it just wants to be on top lol
KF1: Step BOTTOM
KF2: Step on TOP
KF3: TWO Steps on TOP
KF4: Twin Steps on TOP and BOTTOM
save big money with canards!
1:41 hobo santa
interesting
holiday everybody want's to take a holiday lol.....
lol they had an audience
6:55 and 6:41 lmao
lol! 6:43.. *splat*
holyday lol
hello bro..your tests are really great.....even i am working on some project related to KFM...can u please send me the contact details of RICHARD (DICK) KLINE....even the email id would do...i have been trying a lot to get it but was not successful...please help me with this request...thanks....
ive got first comment woop nice vid guys