KF Airfoil Testing!!!

[@RCSuperPowers]

@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.

[@phrawgg2]

This is so exciting and stimulating. I love how scientific this analysis is.

[@CyBearOfBearBros]

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.

[@RCSuperPowers]

Yes, we do the product reviews when we need to fill space while we are working on projects.

[@JMULIKOW]

Great info! Finished product may just be the ultimate RC plane. Looks promising.

[@vanepico]

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

[@crystal130h]

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.

[@longbeforedawn]

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.

[@thebigbrownbox]

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!

[@SINCLAIRRESEARCH]

Verry interesting chaps ,! why stick to the wing? what happens if applied to other control sufaces??

[@RCSuperPowers]

@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.

[@nishbrown]

@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.

[@felixu95]

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.

[@davo1188]

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?

[@FrostbiteUK]

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.

[@Sturmbock71]

Hey, the center of gravity was at the same place during the four diferent tests ? almays the aircraft weight was the same to ?

[@jetplaneflyer]

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.

[@MikesMovies]

Top vid Dave and very interesting. Hey, do you have any thoughts about setting up gyros on helicopters?

[@RCSuperPowers]

For parkjet guys, we have a new ParkJet eBook for 2016: rcpowers.com/community/threads/flight-facts-ebook.19237/

[@jackjuhasz533]

thanks for the great test flights ! answered many of my questions !

[@phillips321]

Variable sounds like the way to go.... any chance Mr Powers will care to discuss?

[@Rokit1man]

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.

[@horizonflyer9]

when i build my first foamie, i gotta use that kf4 airfoil on it. that looked awesome

[@MoJoHobbies]

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

[@loon82]

Hey Dave thanks to you and the team for posting every week Loe your vides very much!! thanks!!

[@carlosthecactus]

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!

[@mordoringer]

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.

[@MYSERVERCLOUD]

cool video, but what is that white thing that fly horizontally from 6:35 to 6:36 ?????

[@crippler1712]

Ok did you buy the kf airfoil? Or did younmake them???

[@uhrik]

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.

[@Cokecanninja]

Could the KF3 be used for slow flying because it generates more lift at lower speed?

[@davereap]

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

[@RenKnight347]

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.

[@torritoist]

Even though this is an old post, do these KF airfoils shift the CG (or aerodynamic Center of lift) too?.

[@theSam91]

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

[@nolifewithoutrc10]

i have your mig 29, i was wondering which kf airfoil i should use.

[@marcinkaczmarek2650]

Did you re balance the plane each time? I assume the airfoils are different weights.

[@adit1001able]

what kf do i use on a glider...foam homemade glider? wid fpv and bombs...

[@RCSuperPowers]

Yes, exactly! Dick and I talk about just that in our phone interview.

[@theultimatesloth]

hey guys can you please show us how you actually make your wings by the way love the your shows

[@RoboTekno]

Pretty much they act as turbulators causing the flow to separate further back.

[@fasterharderstronger]

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

[@Havoc123Heli456]

Hey dave I have a book of this and it has al the history and equations as well as paper planes

[@Ng.Vo24]

Mythbusters! yay, the show rocks! and your planes are awesome man

[@andrewtaylor4646]

What if you put a double step kf airfoil on both sides?

[@vekyhh]

is this out on the market

[@Awesomelord101]

OMG the mirage 2000 one of my favorite fighters apart from the viggen and gripen

[@FEARLFULL1]

great job dave love the vids look forward to them every week keep up the good work =)

[@SanthoshKumar-bm9kh]

hey man, could you just tell me how to find out the "S" in the lift formula? and what is a midspan airfoil?

[@nishbrown]

Watching some of the older vids. Funny thing about his video is, you already have a KFm2 on the canards!

[@philkidd]

Cool stuff Dave... very nice!

[@RCSuperPowers]

I think that might work good!

[@ReMoBoY97]

what KF airfoil to use on F-35?

[@sparrowlt]

wonder how a KF4 would behave in slope soaring..

[@seanfitzpatrick4586]

What about the other KFs

[@abagnalejr123]

Er, actually it IS the Mirage, Eurofighter has the intakes on the bottom, not the sides!

[@mrfourtysevenman]

merry christmas dave!

[@Havoc123Heli456]

awesome and merrychristmas

[@HotNTangy]

dun for get to make a protection thing for the camera underneath

[@1airplane21]

just a passing thought does keith kinda look like santa clause i do not mean any offense in any way just a thought

[@philkidd]

Good stuff Dave!

[@icars98]

7:51 Crosswind landing?

[@SC-lm1dt]

November 7, 2022 ,,,, Still K foiling !

[@Havoc123Heli456]

That book at the end is what I have

[@nsxfan16]

keith always says "oh very nice, very nice!"

[@RobinPhillips]

Always great stuff dude ;-)

[@Helicopterpilot16]

Ha they finaly do, If you look its on there F-35 vtol plane

[@bonyfingers13]

very very nice in my opinion airfoil 4 would be the best

[@nicholasoliver6970]

Do you ever have a "White Christmas"?

[@tomisdabomb02]

listen there is a truck horn in the background

[@justeyFLY1]

that crazy i had that same idea but its more round

[@ModelLights]

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.

[@nicholasoliver6970]

It looked Like there was a KF4 on the canards.

[@llllChrisllll]

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.

[@mantas1111000]

it's not mirage 4000, it's eurofighter thyphoon.

[@Csch90]

give it a golden star

[@mcEwok12]

Combine kf 4 and 3 and it could lift more be stable at higher speed and be more stable in high alpha

[@silverazorx]

can i have one of this cool planes?

[@miGsKills]

Mythbusters?

[@Jono1795]

cool vid!!!

[@jokeartcom]

Great!

[@Lakerguy1000]

@MrFenderStrat7 Val made that noise.

[@RCSuperPowers]

KF1: Step BOTTOM KF2: Step on TOP KF3: TWO Steps on TOP KF4: Twin Steps on TOP and BOTTOM

[@crystal130h]

Yeah, that's called a "pancake" landing. :)

[@HotNTangy]

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

[@keiliekiller93]

nice!

[@computerwiz1995]

I LOVE MYTHBUSTERS!!!!!!!!!

[@Havoc123Heli456]

Keith looks like santa

[@drhavanger]

interesting

[@magicmike1122]

it just wants to be on top lol

[@wingyip]

holiday everybody want's to take a holiday lol.....

[@powxpurplexx]

1:41 hobo santa

[@rockerzac99]

save big money with canards!

[@rocky2694]

6:55 and 6:41 lmao

[@anonymzs]

lol they had an audience

[@wpw2k]

lol! 6:43.. *splat*

[@wetstreets]

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....

[@shariar1995]

holyday lol

[@flightsimy]

ive got first comment woop nice vid guys

[@cheeset6]

What?