FeWOlf
I was looking at the KFm2 foils on the RCpowers planes and wondering which cut to use on the leading edge.
1
2
3
hard to tell from pics
Thx
kff.jpg 
Fly Like Hell, and you will get there!
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Wildthing
FeWOlf wrote:
I was looking at the KFm2 foils on the RCpowers planes and wondering which cut to use on the leading edge.
1
2
3
hard to tell from pics
Thx
kff.jpg 


#3 I would say
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FeWOlf
Thank You
Fly Like Hell, and you will get there!
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Sidewayskiwi
OK i have done pic3 and it was on a F35v3 KF2 flies ok 
all the rest done like pic2 for KF4 set up --but maybe not so sharp---???
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FeWOlf
OK i have done pic3 and it was on a F35v3 KF2 flies ok 
all the rest done like pic2 for KF4 set up --but maybe not so sharp---???

I have Zero artist ability 😁
Fly Like Hell, and you will get there!
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Wildthing
The angle on pic 3 is good just maybe sand the le a little rounder just to make it slightly blunt. For KF4 it is also the same angle, if you were to do an inverted sketch and attach it to the bottom so it would show all 3 layers
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lysle42
3 and big and round, as it will last the longest
Homer
<'(((><
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shadeyB
B89A489F-085D-430A-924C-F8BEC622B5EB.jpeg 
Fly it like you Stole it [smile]
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DualDesertEagle
I'd say 3 would be more suitable for putting on leading edge slats, What u should use is something like this:
   round.png 
And then number 3 of ur drawings would be an unfinished version of this:

LE slat.png
The latter is what I had on my F-18 V3 and my X-31's outer wing portions. I've once heard Dave say it increases the stability at high angles of attack and I do feel like my MiG-29 with its rounded leading edges like in the upper pic isn't NEARLY as stable in high-alpha as my F-18 was, and even my X-31 which only has the slats on the less swept outer parts on the wings is still a little more stable in high-alpha.

And yes, I drew the lower end of the slats with a square edge coz that's the way I left it on both my F-18 AND X-31.
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FeWOlf
very interesting DualDesertEagle,  please explain more
Fly Like Hell, and you will get there!
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DualDesertEagle
FeWOlf wrote:
very interesting DualDesertEagle,  please explain more


Well u can see how stable it is in this video, just skip to 1:25. It's wing-rocking a little bit but not NEARLY as much as my MiG-29. Slats and 4X4 controls (Each elevon servo is connected to both the tail and wing mounted control surfaces, so when I pull up the rear elevons AND the wing elevons go up) made this plane incredibly stable in high-alpha:
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F1wanabe
# 3 beveled edge is the most efficient for KF2; however, I've found that sanding smooth the edge works really well because the sharp edged cause turbulence at the leading edge.  You want the turbulence at the step ( thats how KF2 works) and turbulence at the leading edge makes slow flying and high alpha a little erratic. Try sanding the leading edge smooth and see how it feels! Here's my 120% mig 29 v1 EDF and you can see the sanded leading edge there.
hqdefault (1).jpg 
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F1wanabe
BTW, I did this KF test a few years ago that is really easy to reproduce.  I put KF4 airfoils on a TomHe SU37 profile plane and taped off the steps to easily create different KF's within minute and feel their performance characteristics...
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FeWOlf
it has been a very wet month, and I have built 7 planes in 30 days, I am going to start testing KmFs ( 1,2, maybe 3),  my flying type, slow and Alpha I am using the f-18 Quick Build Profile plane as my test bench, fast build, using balsa stripe with Velcro at different lengths  above and below leading edge, usually weather get better in late Jan., old peeps like me do not like wet cold and rain 😉 usually I slip a very thin 1/2 inch wide balsa strip between the Kf, light, strong or some  thin plastic sheets and packing tape over the edge, watching all your videos, both of you and eScott, been emailing him back and forth, I am building original  scale at this time, been picking eScott brain, as i will be  down scaling after the scale one meets its demise. looking at main fuselage scaled down to adams board 30x20" Again THX ALL!
test edge.jpg 
Fly Like Hell, and you will get there!
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