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

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It is as good an explanation as we have ever gotten. The remaining portion of the airfoil does very little actual lifting. This thread is intended for discussions about building and flying aircraft with Kline-Fogelman wings.

After reviewing his work I decided to build aiefoil MF Hornet. Thought you might like to see what others have experienced Jack, if you need to incorporate this list of characteristics into some larger post than please do. Air is then eventually pushed to the front of the wing by the airstream that passed over the sirfoil. Since the spar was no longer needed the airdoil plate of the main wing was eliminated.

Well the first few flights where to say the least uncontrollable. Flying wings especially benefit from the additional control authority caused by the more adhered airflow over the control surfaces. For a small size a KFm2 is good, going large a KFm4 will give a thicker wing which will better suited for the size, all will work fine.

And, now for the most amazing aspect of all I do not have sophisticated test equipment, but I do design and build a lot of model airframes. Therefore, most of the length of the KF airfoil chord is producing lift even at high angles of attack. When the wing is folded over to create the airfoil, the top is smooth and rounded off to the trailing edge while the bottom has a step formed by the edge of the foam.


Also, I did not want to have to compensate with down elevator when doing a highspeed pass. The modifications were simple and kept the demensions of the plane identical. Roger, Glad to see that you got this thread started so we can kf discuss the KFm airfoils in a little more deatil without disrupting the builder’s thread.

Alrfoil thing will float! And, they make it possible to explore many different ways of constructing an airfoil. You need to log-in to rate articles.

JB, although that pdf was great for the KF, it didn’t mention the Simplest KF which is the single layer added to the wing with No spar as you have depicted above.

It’s called a KFm1 step airfoil. And, it was bouncing all around the universe in the microwave background and showing up on TV sets. Would this design work on a propeller?

The step requires thrust in order to fully engage the trapped vortex. The case study conducted as a part of this research focuses on the UAV RQ-2 Pioneer employed in a stepped airfoil configuration by comparing its aerodynamic characteristics with the conventional NACA airfoil originally used on this aircraft. However, I’ve never really seen one of these in normal aviation.

High winds seem to have little effect on how it performs. And let me also pause here to give Rich Thompson my heartfelt thanks for the work he accomplished there.

Standard wing designs with high airrfoil testing are covered on hundreds of web sites. It would greatly improve on the survivability of these planes because of all the reasons outlined above. As such, I am always on the lookout for new and kf, ways to build models that are both durable and perform well… KFm Airfoils The KF family of airfoils are nothing new. When air flows over any surfaceit will follow known functions.

New Technology: Kline-Fogleman Airfoil Design

This has been one of the greatest experiences of my life. Recommend This Article You need to log-in to rate articles. I think I see that as a bit of a bedlam. The simple KF airfoil shape lends itself well to construction in sheets of various plastic foams, typically expanded polystyrene EPS or expanded polypropylene EPP.


The glideslope just made it so easy to relax into it and cruise around. The hull of a seaplane uses a step to lift the fuselage up high in the water so the pilot can break the surface tension and lift off the water.

I designed a small airplane for use in an introduction to RC aviation video series called Maker Hangar makezine. When in flight, the Maker Trainer 2 is stable at high speeds for its small size and light weight. The step on a KF airfoil works by trapping a vortex of air. Fred, You might want to consider adding a KFM5 strip to the bottom of the under cambered wing to evaluate the changes made to the same wing.

I am perfectly willing to let this one slide if you have the content covered elsewhere, eh? Check out the videos for more info about the plane and the maiden. It may be that a vortex under the control surface has no effect at all. This makes flying wings easier to fly and more maneuverable in higher angles of attack and low speeds. This plane was a copy of the Blue Baby. For this build, given the nature of the construction, I decided to try something different.

Log-In Get access to additional features and goodies. Last edited by jackerbes; Jul 07, at However, this snow they were looking at wasn’t meaningless. A normal airfoil produces friction over the entire surface. They are small but help to prevent the spill off of air running from the the center of the plane to the wing tips. I think the step is important as it creates the lift but not in terms of the size of the step but more as the angle between the step and the LE.