My Fokker DVII Project - Page 14

Jeff Brooks · 5 August 2006, 08:57 AM

I also made a test piece when I finished the last glued piece. once everything has dried, I will tear them apart to see if the glue held and the wood tears. if one of the test strip fails, I'll scrap the rib and try again.
One of the problems with Resorcinal glue is that it stains the wood a purple/brownish color. I tried masking the unglued areas like painting a car ... but I still stained the pieces I had to handle. I am now out of Resorcinal glue, so I'm gonna try T-88. look at the difference with & without masking tape on the build.

Jeff Brooks · 5 August 2006, 09:09 AM

Makhpiyaluta · 5 August 2006, 11:26 AM

Jeff,

I've adjusted your illustration abit to show how our inner ribs are made.

The red lines are the alubox, the blue lines are the two 45 x approx 12 mm stringers wich fit on top and bottom of the box, (they are shaped to the countour of the airfoil}, green are stiffeners also fitting the box.
The web is 1.2mm birchply.
This is al set at 0 degrees. In the middle is ofcourse the dividing line.
Al of this is coverd with 2mm birchply. There's no stringer at the trailing edge the ply is only glued. At the end the whole is coverd and becomes very solid don't worrie. And the fit secures it's always put on right. The end ribs are 3mm birchply. I donn't understand the big cutout on allot of drawings because the wing is slid over the axlebox from the front and the back and the bugeecord and landinggear box are between these ribs. Our end ribs only have rectangular cut outs for the axle.

Willem

Jeff Brooks · 6 August 2006, 06:39 AM

Makhpiyaluta,
the Replicraft plans are an OAW plane, so I am not sure if it is like the Fokker design, but the opening on the outside rib has to be large enough for the two shafts that hold the bungee cord, as they stick out of the rib on this design ...

also, the drawing you sent me is similar to what is on the plans, except the top of the fairing has a strip that makes the two stringers on the top slightly above the aluminum box...

This is where my question is ... the stringer on the top, and two bottom stringers cannot get around the metal work that holds the axle. The two peices of ply that run along the top and bottom that hold the shape of the skin are cut at the landing gear legs.

Makhpiyaluta · 6 August 2006, 08:07 AM

Jeff,

I see what you mean, our wing is wider so the bungeecordholders are inside, no parts sticking out. I used your illustration again to make myself clear.

As you see the outer rib goes more outside.
The 45 x 12 mm stringers are in the middle and rest on top of the axlebox without having an extra support on it. The cutouts for the landinggear are cut trought these stringers, you reinforce the plywood arround it. As said before I don't know if this is a Fokker design, I think it was alterd by the LvA for unknown reassons.
The area your worried about is in this design also much stronger.
I can even jack ours up without taking the wing off, just put a little piece of wood under it for protection. The 45 x 12 stringers are right on top and on the bottom of the bugeecord holders.

Willem

P.S. We also don't have triangular blocks on the axlebox, the ribs just fit to it.

Maxim08 · 6 August 2006, 08:48 AM

Jeff,
I hope that this helps and doesn't complicate things.
Albatross built #6810 in Knowlton.

Regards,
Maxim08

Jeff Brooks · 6 August 2006, 11:53 AM

Maximum,
It seems that the Albatross werks couldn't figure it out either! HAA HAA!

Makhpiyaluta,
Yeah, I could understand why yours doesn't need the triangular blocks ... the outside rib could get away with holding the wing in place laterally, and the rib& stiffeners hold it vertically & for pitch. they might have also modified it because they couldn't figure it out!

Makhpiyaluta · 6 August 2006, 12:43 PM

Jeff,

It seems everybody did it his own way, at least you have choice enough now.
I know the bungeecords were often outside the wing but I don't understand why, when you can divide the wing to take it of it is not necerary. Also the cords are better protected when there inside. Maybe Achim can tell you why it was done so.

Willem

P.S. I totaly forget to make photos yesterday I'll try next week.

Maxim08 · 6 August 2006, 01:36 PM

Willem,
I can't remember the reference right now, but I understand that the axle box fairing was deliberetly shortened because of issues of clogging the narrow gap between the wing and wheel with mud, grass and other junk.
Regards,
Maxim08

Jeff Brooks · 6 August 2006, 02:42 PM

This is a Photo of one of Roger Freeman's planes in Tx ...

both this and the DVIII in the Fort Rucker Museum have the fairings full length. I'll have to email him.