Seat Frame detail photo. . . .HELP!

[Acroeric]

Can someone please send me a few photos of the way the seat frame fits with all the music wire rods etc.. I'm building a new one for the clipwing (one that will handle me hanging from it during the negative G stuff) and I just want to make sure I have it right. Thanks in advance and thanks Kevin Mays for sending this one!

[flybikefarm]

Re: Seat Frame detail photo. . . .HELP!

seat frame

[Acroeric]

Re: Seat Frame detail photo. . . .HELP!

Thanks a million- the forum sure is a help! I had the large wire going from the forward right to the aft left. I see why it wasn't fitting perfectly. My wires were worn a bit so I made new ones out of 3/16" stainless control cable.

My issue is that the stock frame isn't meant to handle negative G. If you look at how it handles load it is only good for positive G. I guess I should just get it going with a regular carb and do the inverted system later. It sure adds alot to the complexity.

If anyone thinks building a clipwing is a quick, easy deal think again! One change causes 10 others. I could have re-built 2 stock airplanes to this one clipwing.

[crispy critter]

Re: Seat Frame detail photo. . . .HELP!

Eric,
Also if you look at the wires with the loop in the middle of them that run fore and aft along each side of the fuslage.....the one on the pilots side will be slightly shorter then the one on the co-pilots side.

[Acroeric]

Re: Seat Frame detail photo. . . .HELP!

It is a really simple design once I got it all in there. The center attach pont is what worries me for the outside stuff. I wonder if Forrest remembers how they did Liesa Marie. . . .

[crispy critter]

Re: Seat Frame detail photo. . . .HELP!

Eric,
I told you it was complicated until you figured it out...then it was simple.

[Robert Lees]

Re: Seat Frame detail photo. . . .HELP!

That photo was remorselessly stolen from my website, and not even a credit! What is the world coming to?

[flybikefarm]

Re: Seat Frame detail photo. . . .HELP!

Sorry George

[Robert Lees]

Re: Seat Frame detail photo. . . .HELP!

Don't apologise, George (you missed the smiley). All my photos are there for public comsumption!

[astjp2]

Re: Seat Frame detail photo. . . .HELP!

You could look at the reference section to see how to get rid of the frame, and the seat sling, I think there are some 337's there...Tim

[Acroeric]

Re: Seat Frame detail photo. . . .HELP!

OK- thanks for all the replies and photos. I ended up getting out some of my old engineering books and doing it right. I actually muddled my way through running the numbers and came up with a design that should hold me at -5G with lots of reserve. Now that I think about it- it should be stronger negative than positive as the seat fabric carries the positive G. I will post some photos asap. It is a modification of the original design- used 3/16 stainless control cable, thicker SQUARE tubing, and welded fittings made of .090 4130 for the harness attach points.

Thanks again!

[astjp2]

Re: Seat Frame detail photo. . . .HELP!

Eric, I think that you might be going a little overkill, the factory used ony 1/8" and no square tubing....Its fairly light and strong. Tim

[crispy critter]

Re: Seat Frame detail photo. . . .HELP!

Eric, I think that you might be going a little overkill, the factory used ony 1/8" and no square tubing....Its fairly light and strong. Tim

You've never seen Eric fly have you?????? lol

[Acroeric]

Re: Seat Frame detail photo. . . .HELP!

Yeah- the factory set up is adequate for positive G but next time you are at your plane look at the center attach point where the forward and aft wires cross- again it is OK for positive G but if you load it in the negative direction the only thing holding you in is some 3/32 music wire that isn't even through welded. If your wires are worn at all then there really isn't much there. When I looked at mine it was worn about 1/4 the way through. (Kevin Mays was nice enough to send me a very nice seat frame to replace it)

I'm building a plane that I plan to do outside loops in. If you have ever had a belt slip when upside down you'll agree there is no such thing as too strong!

[Forrest Barber]

Re: Seat Frame detail photo. . . .HELP!

e-mail any time. YES on Leisa-Marie we used 1/8th cable direct to the seat belts from the triangular gussets then I proofed it by ballasting the airplane to 1805 lbs. and then picking her up by the shop crane attached to the seat belt system, 190 x 2 x 5 g's...... that would be enough for me. Frankly we never flew her with two people outside g's ever!