Sidewayskiwi
What size KF's do you guys use 
Is there a minimum effective thickness 
Can KF's be too thick???
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jimbosflyin
What size KF's do you guys use 
Is there a minimum effective thickness 
Can KF's be too thick???
Paperless Dollor store foam works great.
Parkflyers International 
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solentlife
I've read up many articles abou7t KF ... 2, 3 and 4 .... and TBH - they all say same - the benefits can be easily out done by losses ... but one thing for sure - it can stiffen a foam wing.

Studies have shown that it has a very poor speed range for effectiveness ... 

How think a wing ? I have a couple of models with KF ... but the main one that comes to mind is my RC Eagle. This is a variation on the KF3 type. Instead of having centre sheet and then a KF either side to create the 3 layers ... BOTH KF are placed on top of the wing to create the 'feather pattern' ....

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The main wing base is 6mm and then the KF are 3mm each ... and only has a single span CF spar instead of two as I would think needed without that KF.
The wing is stiff.

I would suggest that as thickness increases - the need to create a rounded L/E would increase. If a blunt slab L/E is left with a thick KF setup - then the L/E would be highly critical of Angle of Attack. Rounding it - would create a smoother transition.
I'll fly anything if I can launch it ! Youtube : solentlifeuk
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