My Fokker DVII Project

Makhpiyaluta · 2 August 2006, 02:45 PM

Jeff,

Could there be a little error your illustrations, when I see the frontview the top stringer looks positioned much lower then on your sideview? Maybe an illusion. Also do you build the two piece wing? I don't see the dividing line. Well anyhow I will draw you our construction tommorow when your interested. We have the two piece wing and it has two 45 x 10 stringers on the dividing line wich also hold the fasteners. This is a 1920's Dutch LvA construction.

Willem

Jeff Brooks · 2 August 2006, 06:16 PM

yeah, the drawings are not to scale ... I am using the Kiger drawings as well as the kelly drawings. I can't seem to figure out how it works. any help would be appreciated!

Jeff Brooks · 2 August 2006, 06:18 PM

Quote:

Originally Posted by Maxim08

Jeff,
Attached is a section of Herb Kelly's drawing of the D VII gear. It is probably the clearest of any drawing that I have seen.
Note that the two outer ribs have alarge relief in them to go over the axle box ends.

Regards,
Maxim08

Maxim08,
I have the Kelly drawings too ... maybe I'm just not getting it. (Mentally slow?) Hey, Maxim08, when you go look at that fokker ... see if you can ger a look inside the fairing! maybe some pix?!? also if possible, get some good measurments on the opening around the bungee cords. I have seen many different openings ... not sure which is Fokker anymore.

Makhpiyaluta · 3 August 2006, 07:24 AM

Jeff,

As promissed I've tried to make you a drawing in Illustrator but it seems I'm not handy enough to get it right

, so this is what I suggest. Saturday I'll make some photos from our wing, in and outside and when you send me a private message with your adress I will make copies of the drawing I have and send them to you by snailmail ok?? It is possible that it differs from original Fokker design because the drawings I have came from the Dutch LvA (Luchtvaart Afdeling) Aircorps.

Willem

Jeff Brooks · 4 August 2006, 08:33 PM

I am working off the Kelly drawings and the Replicraft drawings, and there are a few differences that are slowing me down!
The trailing edge on the replicraft drawings have no stringer to secure the plywood together. It doesn't look like it will work.
The Kelly drawings add a rib and don't go into much detail on how the ribs get assembled inside!
I'm not even sure which is closer to the original Fokker design!
A little help anyone?

Jim Bruton · 5 August 2006, 02:53 AM

Jeff,

Would a modification of the DR-1 landing gear wing setup help? Even some internal views might help you navigate your way to something that will work.

Jim

Jeff Brooks · 5 August 2006, 06:17 AM

Jim,
I'm sure that would be helpful ... at least I know the DR1 wasn't built under license by another factory and thus had a different way of doing it. I belive that the outside ribs are held in place due to a monocoque type construction.

Maxim08 · 5 August 2006, 07:55 AM

Jeff,
I have looked carefully at Kiger's drawings and compared them to Kelly / Cash etc.
I believe that the basic problem that you are having is tthe concept that the axle fairing is completely removable from the axle box. The gussets attached to the axle box are for rib location only. The ribs are not gluded or nailed to them.
If you look at Jim's drawing #5 about mid page where it shows an elevation view of the ribs, there is an annotation:"build ribs in one piece and cut apart on axle centreline".

When you think of the fore and aft wing sections in this context you can see that there is no requirement for a trailing edge piece. The ply wing skins and alloy tube stiffener make for a very strong structure.
Let me know if you agree with the above.
Regards,
Maxim08

Jeff Brooks · 5 August 2006, 08:36 AM

Maximum08,

The plywood on the trailing edge should have something to glue to, right? Do you think the two pieces of ply will adhere to each other without a stringer? My limited experience says the two pieces don't have enough surface area for the glue to hold onto.

Also the other issue is not the "gussets" that are riveted to the axle box, but the two outside ribs, and how they are attached to the rest of the wing.
Most of the wing construction has sort of a semi-monocoque construction that provides the framework under the skin to hold the shape. The ribs that are outside the metal work have none. I am concerned that once I cut out the opening for the streamlined tubing, the rest of the wood around that area will loose their shape. there has to be something there to help the ply keep it's shape. I am considering adding a second piece of ply under that area to it becomes laminated ... but how did Fokker solve this one. what was original?