June 8, 2019 posted by

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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KFm-6 Flying Wing

I think I might fit some nice Coroplast fences to the center section to act as skids for future flights. I was so young then, but I remember many people on the bus asking me, ” Does it fly with that funny airfoil section? First was a SqIn It was originally devised around 50 years ago for paper airplanes. This caught the attention of a group of engineers that worked at NASA.

And it requires no dihedral for stability. I held all of the HLG records for about 10 years, both indoor and out door.

** Kline-Fogleman (KFm) Airfoils – Advanced Theory/Science ** – RC Groups

Last edited by Freddie B; Aug 24, at With no tail and therefore no tail moment arm for stability it is up to the vertical surfaces to keep it tracking straight.

The enormous end plates act as vertical stabilizers as well as a guides forcing the air to maintain direction from the leading edge off the trailing edge. To accommodate this new airfoil changes had to be made to the build and design of the MF Millions of people had seen this snow on their TV sets, but nobody had connected the dots until Arno Penzias and Robert Wilson discovered what it actually was.


In addition to increasing the structure of the paper airplane, the stepped airfoil showed flight characteristics that would be desirable on any aircraft.

When there is a sudden bend the rules are that the lump of air is accelerated.

KFm wings a basic explanation

Arifoil need to build multiple models that vary in only one area such as size, shape, or type of KF variant at a time. The tests might investigate the load carrying capabilities, stall characteristics, maximum angle wirfoil attack, speed envelope, CG envelope, etc. 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. Interesting and quit easy verify. The characteristics I am interested in comparing are: After the success of the paper airplane design, Floyd Fogleman, a modeler, expressed interest in the airfoil and built a large balsa model for testing.

Jack, you have a serious humor deficiency. They’ve actually been out for a while http: I had a can of spray adhesive in the cupboard and a quick test showed that it gave a very strong and quick bond when sprayed lightly over both surfaces without any bubbling of the paper. Kline-Fogleman Arifoil on a flying wing.

That thread became the Zagnutz thread and then blossemed to other KFm discussions. I had purposely ensured that the center plate joined in different places to the other plates so that the joints were stepped. Thanks for the inspiration! This is great stuff, and I will refer to this often as I’m designing new models In addition, because it penetrates the air so well and is extremely stable, it will produce better photography.


It seemed to take forever to cut out all the parts for this wing.

Since then, I have learned a few things about aerodynamics. If you build your own models and lack the ability to hot wire cut a wing then a layered KF wing is a must build.

The captured vortex also sucks the airflow down to the wing so that the airstream is less prone to delamination. Retrieved from ” https: Airfol airfoil for speed and stability.

Can you imagine there being a number of comparisons under way and all the details being worked out or discussed here in one thread? I’ve compiled a list of all the various reports that have been posted in the RC Groups on the KF airfoil.

** Kline-Fogleman (KFm) Airfoils – Building/Flying Discussion ** – RC Groups

The idea works but only with active automated re-configuration of the shape of the step s during flight. Remember Me Forgot Password? Drawing by Lucas Weakley. One of the aspects of innovation is that it shrinks time. And, now for the most amazing aspect of all You’ve made my day! It is also well known that flying wings are extremely unstable and stall easily in flight. It was something that was profoundly important. However, I haven’t collected data on these wings and compared them side by side.

Posting Quick Reply – Please Wait. However, a claim has never been made that they make great gliders.