Hey dave what happened to the old times flying planes reviews tips testing random funny experiments and now picture slide shows and what happened to Kieth ya know that one guy from back in the day bring him back cause your videos have gone to shit
Its all about old "Reynolds number" which basicly defines what kind of airfoil you could/ shouls use. This "Reynolds number" tales why butterflies wings, small Rc-plane and large Jet plane has different aifoils. So why you don't use it on your prop? basicly its foil is too short and its not good think to try create turbulence and same time drag without creating additional lift. vertical stab has normally only small angle of attack, there for KF creates only drag not lift.
Hi Dave, have you ever experimented with a foam that has small round dimples like a golf ball? I saw a show on it when a car had them put on, the car was bout 20% cheaper to run on fuel due to wind residence being improved. Be a devil and build one. I think it will go a lot faster (my guess anyway) The golf ball dimples could be put on with a hot soldering iron with a ball at the end as a tip.
@lukeritchiedesigns we cant fault him for doing what he loves. Im completely bored to, but keep coming back to see if he has done something I was interested in. BUT.. Im super duper impressed he is following his passion. its not about us, its about him following his heart, doing what he loves.. and has a great time doing it. his channel is about him having fun. Two thumbs up for having fun!
@djmedic2008 I still respect what he does & think this video is great for his new viewers. The flying videos from way back where more entertaining. Dave might have been the one that got me to switch from RC cars to planes. Scratch built depron planes with kf airfoils are super awesome. Easy to build, low investment and risk. Slow flying. Easy repairs. If he switched up these informative vids with fun flying vids I think the channel would be more appealing to a wider audience including old fans!
Since my first rcp plane, the f22 v1 kf4 has been making my life bearable by allowing me to fly in perpetual windy conditions here in pa.. I think people on the forum are probably sick of me mentioning the miracle kf4, but my flying field sits in the vortex of a perpetual tornado and yes, the kf4 will allow you to fly even in a tornado! Vindication at last! With a polished front edge drag is no more than a flat airfoil. I mean sanded up to the kf step.
@RCSuperPowers Dave why don´t you make videos like about 2 years when you were having fun and videos were much more interesting please make this kind of videos.
dave i have long watched your videos i love watching you guys and your crazy planes i mostly fly nitro myself but i have a few park foamys too but you have inspired me greatly im building a full size ultralight glider right now im using foam as the main wing with spruce spars and im thinking now im going to make it a kf airfoil thanks dave and dont ever stop making videos i would miss them greatly!!!
I was bored to death. What happend Dave? Why voice over videos only? Why are you using fotos instead of video footage? Are you still into RC flying or it is only business for you? Like FlyFrontier259 said - I miss the old videos...
@RCSuperPowers Well, Dave, your average Sheeple just can't visualise the Airflow. If you want to see the "KF Aerofoil", AKA the Stepped Vortex-Turbulated Aerofoil, done in Triple Variable-Geometry (Sweep, Span, & Area) ; search 'Origami Aerophysics', & see, how I was taught these tricks in 1973 ! There's not a lot that's new, under the Sun, Munchekins... Ciao !
A screwdriver makes a terrible hammer but a hammer also makes a terrible screwdriver. The quirks of KF airfoils might make them bad for commercial planes etc BUT for scratchbuilt parkjets like the RCPowers, Tomhe, etc designs? They are perfectly capable of being the right tool doing the right job.
Don't get caught up in the academia of "which wing is the best". Edcuate yourself on which is the right tool for the right job. If it's a KF Airfoil? Use it.
its just sad to see a once great rc channel like yours just get borring. they were fun before when they were at the feild, with your reacction and live commentary. sorry butr your videos are just vary borring now, go back to the orriginal way that u did ur videos. why arn't you?
I think the addition of the KF modification does some pretty cool things to wings on these planes. It thickens and stiffens the wing, which works great, especially on the larger designs. You can sand a very nice symmetrical leading edge on a KF4.
KF2 worked so awesome on my F22 V2 I built using foam board (heavier than most foams) but it flew like it's really light weight and made of depron. It lands almost vertically when I cut off the throttle and add spoilerons. You maybe adding a little weight, but you're gaining lots of lift, stability and strength by adding a KF!
You are dead on about the shock absorber effect. My KF leading edges are rounded, like a traditional airfoil, not beveled. On my F-18v2 (KFm4) the wing is sanded/rounded all the way to within 1/2 inch of the step.
I use them for the simple reason that they work. Well.
@melrobRTF It has already been researched. Just google it.
And no, they are not magic! Actually compared to "real" airfoils they are very draggy. That air bubble behind the step is a vortex caused by the air separating from the surface and like any disturbed airflow this cost energy. A lot of energy.
The simpler forms are easier to build than wings with conventional airfoils while providing more lift than the flat plate which makes sense for medium sizes foamies. But that's about it!
@americanflyyer Thanks man, Yes i know how da KF works ;) And indeed, it is more draggy (like when you compare the draggy flat end of an american car to the more aerodynamic end of an other, the vortex drastically increases air resistance.) But the interesting thing is that a KF actually 'changes' its air foil shape according to is speed. So instead of making this technologically advanced morphing airfoil you can just take a KF for the same performance. (i guess)
@melrobRTF That again is because of the vortex. It energizes the boundary layer and thus gives you more lift at lower speeds. Esentially, you can do both fly fairly fast while still maintaining certain slow flight capabilities. But it does neither of it as good as a conventional airfoil designed for its specific purpose. Like I said, they might be a good choice for medium sized foamies as they are simple to build and are definitelly an improvement over the flat plate.
Informative BUT. Can't u go back to the goofy rc powers we all love ...?
colliente97 1 month ago 3
Comment removed
mhmdmirzaei 1 month ago
i like planes with symetrical airfoil like my Sbach 342, is the symetrical kf good for aerobatics like flying inverted?
MrROTD 2 months ago
OH FIRST COMMENT OF 2012 YEAH!!!
Darksidestudios100 2 months ago
how many videos do we need about the fricking kf airfoils?? We get it they are good... jeez
Redblood797 2 months ago
Hey dave what happened to the old times flying planes reviews tips testing random funny experiments and now picture slide shows and what happened to Kieth ya know that one guy from back in the day bring him back cause your videos have gone to shit
Slingshotbub 2 months ago 5
if the KF is so good... should i put it on the vertical stab?....& why don't they have them on the prop? like a #1 or something?
tomascontrerasjr 2 months ago
@tomascontrerasjr
Its all about old "Reynolds number" which basicly defines what kind of airfoil you could/ shouls use. This "Reynolds number" tales why butterflies wings, small Rc-plane and large Jet plane has different aifoils. So why you don't use it on your prop? basicly its foil is too short and its not good think to try create turbulence and same time drag without creating additional lift. vertical stab has normally only small angle of attack, there for KF creates only drag not lift.
RutinaRottis 2 months ago
Make a video about control rods, control surfaces etc.
Jonathunor 2 months ago
Hi Dave, have you ever experimented with a foam that has small round dimples like a golf ball? I saw a show on it when a car had them put on, the car was bout 20% cheaper to run on fuel due to wind residence being improved. Be a devil and build one. I think it will go a lot faster (my guess anyway) The golf ball dimples could be put on with a hot soldering iron with a ball at the end as a tip.
PlatinumGordon 2 months ago
Agree with comments below, make some more videos where you are flying and having fun. Those videos rocked. These not so much rock.
lukeritchiedesigns 2 months ago
@lukeritchiedesigns we cant fault him for doing what he loves. Im completely bored to, but keep coming back to see if he has done something I was interested in. BUT.. Im super duper impressed he is following his passion. its not about us, its about him following his heart, doing what he loves.. and has a great time doing it. his channel is about him having fun. Two thumbs up for having fun!
djmedic2008 2 months ago
@djmedic2008 I still respect what he does & think this video is great for his new viewers. The flying videos from way back where more entertaining. Dave might have been the one that got me to switch from RC cars to planes. Scratch built depron planes with kf airfoils are super awesome. Easy to build, low investment and risk. Slow flying. Easy repairs. If he switched up these informative vids with fun flying vids I think the channel would be more appealing to a wider audience including old fans!
lukeritchiedesigns 2 months ago
Since my first rcp plane, the f22 v1 kf4 has been making my life bearable by allowing me to fly in perpetual windy conditions here in pa.. I think people on the forum are probably sick of me mentioning the miracle kf4, but my flying field sits in the vortex of a perpetual tornado and yes, the kf4 will allow you to fly even in a tornado! Vindication at last! With a polished front edge drag is no more than a flat airfoil. I mean sanded up to the kf step.
gstrysky 2 months ago
Using pre-shaped rounded balsa or carbon fibre for the leading edges helps save time and adds accuracy to the wings performance.
FrostbiteUK 2 months ago
Man I love your planes. Why would anyone down rate this video??
SnowWalkerPrime 2 months ago
Your videos are turning into shit i missed the flying, the builds, the experimental planes. What happened to the f-35 vtol scrap that?
iceknite5 2 months ago 3
@RCSuperPowers Dave why don´t you make videos like about 2 years when you were having fun and videos were much more interesting please make this kind of videos.
jaldek41 2 months ago 20
@jaldek41 he is kinda ignoring every body's recommendation for improvement and continue doing his thing...
youronlycow 2 months ago
@youronlycow Eh out therwe is a lot of better guys that make video´s Flitetest,Rcmodelreviews,NightFlyer,RcTestFlight..
jaldek41 2 months ago
Hmm another video that he has already done.
thefsxflyer 2 months ago 2
Frictionless?? Rubbish! KF are great for rc planes, but they create more drag than traditional airfoils.
Thehassoes 2 months ago 5
spread the word !
KFm profiles rule the rc backyard-skies
I don't wanna use anything else anymore!
thanx to mr kline and mr fogleman
(if this is'nt a promo i don't know anymore)
did we convince ya?
grtz from the netherlands :)
tante0leen 2 months ago
dave i have long watched your videos i love watching you guys and your crazy planes i mostly fly nitro myself but i have a few park foamys too but you have inspired me greatly im building a full size ultralight glider right now im using foam as the main wing with spruce spars and im thinking now im going to make it a kf airfoil thanks dave and dont ever stop making videos i would miss them greatly!!!
just1ofgod 2 months ago
I was bored to death. What happend Dave? Why voice over videos only? Why are you using fotos instead of video footage? Are you still into RC flying or it is only business for you? Like FlyFrontier259 said - I miss the old videos...
frestdaggy 2 months ago 2
Less voice overs please... Miss the old "live on field" videos.....
FlyFrontier259 2 months ago
@RCSuperPowers Well, Dave, your average Sheeple just can't visualise the Airflow. If you want to see the "KF Aerofoil", AKA the Stepped Vortex-Turbulated Aerofoil, done in Triple Variable-Geometry (Sweep, Span, & Area) ; search 'Origami Aerophysics', & see, how I was taught these tricks in 1973 ! There's not a lot that's new, under the Sun, Munchekins... Ciao !
WarblesOnALot 2 months ago
How about we ditch these dumb "informational videos" and jump in build videos!
SecondCocacola 2 months ago
A screwdriver makes a terrible hammer but a hammer also makes a terrible screwdriver. The quirks of KF airfoils might make them bad for commercial planes etc BUT for scratchbuilt parkjets like the RCPowers, Tomhe, etc designs? They are perfectly capable of being the right tool doing the right job.
Don't get caught up in the academia of "which wing is the best". Edcuate yourself on which is the right tool for the right job. If it's a KF Airfoil? Use it.
Lavaelous 2 months ago
its just sad to see a once great rc channel like yours just get borring. they were fun before when they were at the feild, with your reacction and live commentary. sorry butr your videos are just vary borring now, go back to the orriginal way that u did ur videos. why arn't you?
zigzag1378 2 months ago
I think the addition of the KF modification does some pretty cool things to wings on these planes. It thickens and stiffens the wing, which works great, especially on the larger designs. You can sand a very nice symmetrical leading edge on a KF4.
johnw5734 2 months ago
what if im going SUPERSONIC lol
JimEdmiston 2 months ago
Great video Dave!!
SubatomicRC 2 months ago
I still miss the old classic Dave Powers videos ...
RCFLIGHTHELP 2 months ago
KF2 worked so awesome on my F22 V2 I built using foam board (heavier than most foams) but it flew like it's really light weight and made of depron. It lands almost vertically when I cut off the throttle and add spoilerons. You maybe adding a little weight, but you're gaining lots of lift, stability and strength by adding a KF!
archedperson 2 months ago
Dave, man, you sound tired, are you OK? And no commercial for your RC Course!? I am shocked!
Cocorayko 2 months ago
You are dead on about the shock absorber effect. My KF leading edges are rounded, like a traditional airfoil, not beveled. On my F-18v2 (KFm4) the wing is sanded/rounded all the way to within 1/2 inch of the step.
I use them for the simple reason that they work. Well.
nishbrown 2 months ago
@nishbrown Right on man. Getting a good system down on making these is so key. They just work so well.
RCSuperPowers 2 months ago
Yay! No ad for their course!
ILSLanding 2 months ago 39
Who cares?....
OMFGitzDannyP 2 months ago
@OMFGitzDannyP Don't watch then...
maglight117 2 months ago 4
@OMFGitzDannyP People who build RC planes care a lot about what design improves the performance and handling of their models
CrackerMcGillicuddy 2 months ago
I miss watching your videos Saturday mornings while I drink my coffee. Why the time change?
deepwater1974 2 months ago
Dave build that thing from the movie Flight of the Navigator...
maxjosephwheeler 2 months ago
Comment removed
Amaroqdricaldari 2 months ago
Dave build a flying saucer...
maxjosephwheeler 2 months ago
Quite right!
tonscordova 2 months ago
@RCsuperPowers
I think that is a great theory, one that is definitely worth some scientific research. ;) ill put it on my to do list.
melrobRTF 2 months ago
@melrobRTF It has already been researched. Just google it.
And no, they are not magic! Actually compared to "real" airfoils they are very draggy. That air bubble behind the step is a vortex caused by the air separating from the surface and like any disturbed airflow this cost energy. A lot of energy.
The simpler forms are easier to build than wings with conventional airfoils while providing more lift than the flat plate which makes sense for medium sizes foamies. But that's about it!
americanflyyer 2 months ago
@americanflyyer Thanks man, Yes i know how da KF works ;) And indeed, it is more draggy (like when you compare the draggy flat end of an american car to the more aerodynamic end of an other, the vortex drastically increases air resistance.) But the interesting thing is that a KF actually 'changes' its air foil shape according to is speed. So instead of making this technologically advanced morphing airfoil you can just take a KF for the same performance. (i guess)
melrobRTF 2 months ago
@melrobRTF That again is because of the vortex. It energizes the boundary layer and thus gives you more lift at lower speeds. Esentially, you can do both fly fairly fast while still maintaining certain slow flight capabilities. But it does neither of it as good as a conventional airfoil designed for its specific purpose. Like I said, they might be a good choice for medium sized foamies as they are simple to build and are definitelly an improvement over the flat plate.
americanflyyer 2 months ago
WHats the fastest little motor to use and used not to much power for long air time?
Dorisequador 2 months ago
good info thanks dude.
PlanAskateboarding 2 months ago
Ooh double upload. This and DaveSuperPowers
melrobRTF 2 months ago
FIRST VIEW AND COMMENT!!!
Darksidestudios100 2 months ago