Welcome to the ** Kline-Fogleman (KFm) Airfoils – Advanced Theory/Science ** discussion thread. The purpose of this thread is to try and. The simplicity and performance of the KF airfoil have made it popular in the Maker Trainer 2 and uses the KFm-2 (Kline-Fogelman model 2) airfoil design (a. The idea works but only with active automated re-configuration of the shape of the step(s) during flight. Further testing has shown that this airfoil.

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Parallel chords, tapered kdmall work fine, its just a matter of adjusting the step position as per the guides, and the COG will also need setting correctly.

It has been noted that during a steep climb, once the throttle is cut back the plane will just settle down and fly level with the ground. Out comes the glue gun — or does it?

KFm-4 airfoil for speed and stability | Flite Test

One of the aspects of innovation is that it shrinks time. Jack Images View all Images in kcm Views: Either will be good. Since then, I have learned a few things about aerodynamics.

Log-In Get access to additional features and goodies. Recommend This Article You need to log-in to rate articles. A new wing is born… It took very little time at all to draw up a 3D model in Sketchup and then convert this into some 2D plans.

Many of my designs that use a KF airfoil have similar flight characteristics, as described above. Nice job Red, looks and flies great. The only good thing is it is all straight lines!


The KF airfoil requires zero degrees reflex on a flying wing which means no drag from the reflex action. Even better, it balanced perfectly with no added weight.

The higher the speed, the higher the Reynolds number and vice versa. Depending on the version you choose the step may be on the top, bottom, both, arfoil even multiple steps on either of the surfaces. It was originally devised around 50 years ago for paper airplanes. I was out on Friday with a friend flying some FPV and these wings really are fantastic. Existing designs that can be airfiol to our purpose are easier than designing from scratch.

Kline Fogleman Airfoil on a flying wing. Maybe we can see? Originally Posted by kffm. Jan 30, They provide great stability. I’d suggest talking to some of lfm Canuck neighbors about fixing that. Also, the structure of the plane felt more solid, and stronger. Both had issues but I think it was mostly cg problems. The image is the results of that study and as you can see, the KFm2 was the “victor” by a narrow margin.

KFm wings a basic explanation

Marty Most of the data on the KFm is what we as model builders have collected by flying the Kfm wing. However I do feel that a KF will work as an alternative build. You might find yourself using the design on all of your future builds. As such, I am always on the lookout krm new and innovative ways to build models that are both durable and perform well… KFm Airfoils The KF aorfoil of airfoils are nothing new.


Post as a guest Name. The KF airfoils do not conform to conventional aerodynamics. Super fast and maneuverable and would slow to almost a hover on landings. With each joint taped on one side I airflil the halves back and a thin bead of hot glue gave a nice strong seam. The first man carrying KF airfoil based aircraft was successfully flown in by Richard Wood in Canada.

KFm wings a basic explanation | Flite Test

Sir Fly on May 21, They are small but help to prevent the spill off of air running from the the center of the plane to the wing tips. We can’t statistically, scientificly or any other way prove the KFm works or why. I have followed the KF threads from the start. All discussions and attachments are still in place in the parent thread, many of the figures, studies, and other attachments will be or have been moved to airfoi 2 here. Log In to reply. Apr 21, airroil It becomes attached to the surface of the airfoil and since is it rotating faster than the air beneath the airfoil, it reduces the air pressure on the upper surface.