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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Photo by Lucas Weakley. Aerodynamics Aircraft wing design. I think I see that as a bit of a bedlam. Very pleased with the results. Fortunately, the step is relatively small in the big scheme of things and the aircraft can still perform normally.

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

Thought you might like to see what others have experienced This caught the attention of aifoil group of engineers that worked at NASA. It was something that was profoundly important. The further back the center of gravity is the more desirable it is because of the center of balance.

It was a very simple process and can be shown in the links above. The only downside to this design is the appearance. Rich Thompson Comparison Study – Feb So isn’t the kfm- 1 KF airfoil the airfoil Flite Test planes utilize? That final crash landing is an interesting one.

I decided on the KFm-4 air foil, or as some choose to call it “the speed wing” Aorfoil wing has a symmetrical airfoil, found in may acrobatic and sport planes. The point of science is to collect repeatable data through accurate measurement so that you can come to some conclusion.


They are less affected by strong winds. This flying wing originally designed by ProjectFlightDesign has a deep KFm-2 step that produces too much lift and makes the wing climb with excessive power. Should we call an airfoil section consisting of two triangles the Carmel Pule” airfoil? What this does is create a bubble of air behind the step to the trailing end of the wing in which air flowing over the wing from the leading edge then slips over the airfoik, instead of dragging over the entire wing surface.

Enhancing the aerodynamic performance of stepped airfoils Numerical and Experimental Study 1.

Links to over KF wing builds. Lots of data all in one place.

Kline–Fogleman airfoil

Wish I had added the space in the middle as you and now FT has done with the “Bluntnose”. The airplane is called the Maker Trainer 2 and uses the KFm-2 Kline-Fogelman model 2 kfmm design a single step on top. To the RC community: They are reports from all around the world from people who post their findings in the RC Groups on the handling of the KFm ajrfoil. It was originally devised around 50 years ago for paper airplanes.

It gives you so much more room for FPV gear. More power is more fun.

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

Unfortunately, there were some complications when filing and writing the patent. I had purposely ensured that the center plate joined in different places to the other plates so that the joints were stepped.


I have followed the KF threads from the start. He was a photo-retoucher by profession as well as a pilot and model airplane builder. The fight characteristics, however we greatly enhanced.

Recommend This Article You need to log-in to rate articles. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I know what I speak of here.

Good or Bad and I have had both. If it is too far back especially the thing just won’t fly look on my YouTube channel for the original FPV Wing maiden! The step on a KF airfoil works by trapping a vortex of air.

The undercamber wing seems to retain more lift at really slow airspeeds. The claims that have been made for the Sirfoil airfoils still remain intact.

However, I’ve never really seen one of these in normal aviation. Recommend This Article You jfm to log-in to rate articles. And, it was bouncing all around the universe in the microwave background and showing up on TV sets.

I kcm the underside angled portion of the airfoil does the lifting. Looking for your store account? This new layer should be the same thickness as the existing wing or thinner—any thicker and it could start creating drag. It may be that a vortex under the control surface has no effect at all. Check out the videos for more info about the plane and the maiden.