Junkers Ailerons.

[Texas Buzzard]

I have the airframe 80% finished. It has an 86" span and a 12" chord. It is a typical balsa/ply structure with some Depron inside the fuse sides. I intend for it to fly 68 miles w/ a 10 mph tailwind. A K.& B 61 will power it. It is expected to be a rather slow flier ( ~ 40 mph). The 11% Clark-Y with a Phillips entry will be standard for this type plane. It is a rough version of the Wilga.

The Question is how should I hinge these Junker ailerons. The Steak and the Fleshlier Storch had them because at slow speeds the aileron was below the wing in smooth air. They were just more efficient - how do I hinge them?
Commercial hinges won't work. I do have a solution using 3/Th inch spruce as standoffs and a wire pivot thru' the drilled standoffs.

If there is another idea I'd be pleased to know about it. THANKS

[fnev]

You could use large control horns. 3 per hinge: 2 on the wing and 1 on the aileron/flaperon. I did it a long time ago and it worked very well.

[nmasters]

I wrote an article for my club's newsletter about Junkers flaps. It's 1 MB MS word format (http://users.acsol.net/~nmasters/temp/Sept03Ltr.doc). If you want to look up the source material it's listed here (http://users.acsol.net/~nmasters/External_airfoil_flaps.htm) . Many of the links aren't any good anymore because some bureaucratic genius decided to move the NACA archive to a different domain but you can find them pretty quickly by googling for the report numbers.

--Norm

[Texas Buzzard]

Thanks to two respected posters.
nmasters I will take a look.

I knew someone has done this.

THANKS

[Work in Progress]

Norm,
That is a really good article you did for your club magazine - very useful indeed. Thanks

[nmasters]

Thank you,Work in Progress--

It took about 3 months to research and wright that. Here's a pic of the plane that got it going:

[biber]

Ah, I've seen that thing in Aalen-Elchingen, obviously the photo has been taken just there.

biber

[nmasters]

That's Wolfgang Uhl's highly modified U-2. I don't know his home airport but it's certainly possible that he flew into there. There is a plane called "Aachen" (oddly enough stationed at Aachen) that is about the size of the U-2 but the vertical fins are inboard. I believe that Aachen may have been Reimar Horten's last airplane. There are some videos of a U-2 in Stockholm (http://www.youtube.com/profile?user=Hoverwing2008&view=videos&query=wing) and some of the last Hortens (http://www.youtube.com/user/horten21st) on Youtube.

--Norm

[biber]

I think it (U-2 mod) is stationed in Aalen-Elchingen.
I've been there at the Idaflieg Sommertreffen each year for the last few years and it was always hanging from the hangar roof and on rare occasions I saw it flying.

The 'Aachen' btw isn't stationed in Aachen anymore, it is sadly resting, hanging from the hangar wall on the airfield Mönchsheide 80 km SW of Aachen.
I saw it hanging there in 2001 when the thermals left me on a XC flight from Aachen and I had to land.

The 'Aachen' was built by Uli Schäfer, who is working at the Aachen Untversity of applied science, just where I happen to study aerotech(I know him personally).
When he built it, he could not afford it on his own money but found a sponsor.
Sadly the sponsor and Uli ended in dissent, leaving Uli without access to his own handiwork.
Before Uli started building the Aachen, he was in close contact to Reimar Horten and had visited him in Argentina several times.

Together with students he is working on a giant model now:
http://www.stuko.fh-aachen.de/index.php?option=com_content&task=view&id=15&Itemid=15

Sorry Tex Buzz for the OT, but I thought it might be just as interesting for you aswell.

biber