Libelle

Maybe mistaken in the Wiki entry and otherwise? Glasfaser must be able to say what the true airfoil section is. From what I'm gathering the 201 and 301 have the same airfoil yet if Wil Schuemann is correct in his assertions the both mentioned Libelle have a Heutter airfoil and not a Wortmann as is seemingly commonly thought.

If it's any help, I obtained a set of laser cut templates for the Libelle 201b from Streifeneder. They are all marked as FX 66-17AII for all wing stations. The FX series would be a Wortman airfoil.

Mark Guay

I have built a number of wing wheels and WingRiggers for both the 201 and 301. I can definitely say that the airfoils are very different. The 201 is thicker, with more curvature on the bottom.

The 301 aerofoil is a lot thinner & designed for flaps so very different.

I have spoken to Christian Streifeneder regarding turbulators, he has pointed out that there may be a case for putting them on the top surface of the wing, but then it would be difficult to wash the wings. He's not convinced they are effective on the underside.

By the way, there is no H in 201 (regardless of what Wikipedia says) - the H in H301 denotes Hutter who was involved in it's design, but the 201 did not.

Cheers,
Nick.

I just sold my H301 with the Scheumann wing mods. The leading edge is sharper and the entry (stagnation point) is lower. The flaps actuator is modified to let the ailerons move closer to the flaps for cambering.

The Libelle 201 has a much thicker wing and you'll see that if you try to put a H301 canopy on a Libelle 201.

The airfoils on the Standard Libelle (201) and the H301 Libelle are different. The 201 uses the (Wortmann) FX 66-17AII-182 airfoil, which is 18.2-percent-chord thick. Wil Schuemann brilliantly observed that the 301 airfoil is very similar to an FX 67-K-XXX airfoil except near the leading edge---thus the leading-edge "extension" of the Schuemann modification.

Dan Somers
Port Matilda, Pennsylvania, USA

This clarifies the airfoil matter for me thanks.

I'm looking at going ahead with purchasing a 201 project. It was damaged and needs to be thoroughly checked out with minimum repairs being fiberglass to the leading edge of one wing that had contacted a fence post or small tree on an off field landing and a new canopy. I'd like to find a person who may be able to transport the glider for me to California from Pennsylvania. I can't afford to pay a lot. Maybe someone knows someone who happens to be road tripping out to California from the East Coast?