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Old Sep 26, 2009, 02:25 PM
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j3tman's Avatar
United States, NE, Papillion
Joined Sep 2009
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kf airfoil

has any one built a foamie plane or jet using a kf airfoil. i saw a video with rcpowers trying to use one but i was wondering if anyone else has had success with one. If you have how would you construct it?
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Old Sep 26, 2009, 03:17 PM
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Tram's Avatar
Florence, Al
Joined Oct 2000
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Lots of guys using the KF airfoil in the scratched foamies.. Seems pretty simple, just fold the foam over on itself and call it a day..
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Old Sep 26, 2009, 04:08 PM
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A huge KF thread can be found here:
http://www.rcgroups.com/forums/showthread.php?t=558321
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Old Sep 26, 2009, 06:01 PM
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Melbourne, Australia
Joined Oct 2008
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My first KF mod was to put a KF2 onto my Dekan f22. I just added 1 piece of 6mm depron to the wing and rounded the leading edge. Makes the wing much stiffer.

Plane flew a little faster, seemed more stable, didnt notice much increase in lift. But on second attempt, i put a KF onto a much lighter plane and really did notice baloon like lift.
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Old Sep 29, 2009, 11:25 AM
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United States, NE, Papillion
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thanx for the info i was looking at the build threads for a while to get an idea but does anyone have like a step by step how to make a kf airfoil i liked matthew73 idea of just sanding some foam on the leading edge but i was wondering if anyone had some pictures that they would like to share?
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Old Oct 17, 2009, 06:41 PM
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Melbourne, Australia
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Most KF sections should be 40-50 % of wing chord. The height of the step should be about 9% of wing chord. Roughly speaking.
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Old Oct 18, 2009, 12:03 PM
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United States, NE, Papillion
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the kf airfoil is about 40-50% and its 6mm high becuase thats how thick the epp foam i using (cant really change anything). i am planing on putting a kf airfoil on top and on bottom like the one on the bottom (Kfm4) http://rcfoamfighters.com/blog/wp-co...-60percent.jpg. this will make my go faster with more stability while still makeing it sporty like (i hope)
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Old Oct 20, 2009, 08:09 PM
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United States, NE, Papillion
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does any one have any pics of kf airfoils i have the basic idea of how it works i just want to someone else doing it
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Old Oct 21, 2009, 06:06 AM
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use the link in post 3, a ton of picts
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Old Oct 21, 2009, 08:34 PM
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Kotzebue, Alaska
Joined May 2006
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When I was using FFF I used a simple KFm step at 50% on top, mostly for the strength it gave the wing set.
My mothod of doing this is to measure the step at 50% of the wing at both the root and tip. I laminate this step on top.
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Old Oct 22, 2009, 04:04 PM
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United States, NE, Papillion
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hey Rusty-Gunn did you sand the edge down to make more aerodynamic or did you just slap it on there?
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Old Oct 23, 2009, 09:01 PM
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United States, NE, Papillion
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i was lookin through the kf airfoil pics on some other threads. What would you recomend for a parkjet i want it to fast and do tricks but also slow flight to. after rethinking my plane design would you chose to put kf airfoil on top or both top and bottom?
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