Cut lengths as needed to get your total length. I dont't believe there
ever was any assumption of having to use continuous lengths of glass in
any installation. In many cases it is easier to get better layups by
using shorter layups in complicated areas. Though I have strayed away from
stretching to a great extent to make things fit. At what point does bid
start acting like uni when you start stretching it? I certaintly wouldn't
stretch it more than 15%. An inch of overlap in this situation should be
more than enough. What is most important is to get good adhesion with no
voids along the entire surface. Which is much easier to do if you are not
stuffing a real long piece of sloppy fiberglass in a long slot. These
are just my observations from working with the stuff.
Steve Hagar
A143
Mesa, AZ
> [Original Message]
> From: Rowland & Wilma Carson <rowil@clara.net>
> Date: 1/1/03 1:00:12 PM
> Subject: aileron hinge flange BID size
>
> I've had a look in the archives and the H&T and can't find anyone
> else mentioning this particular problem, so maybe I am being stupid
> somehow! (No doubt someone will tell me if that is the case ....)
>
> I am shortly about to do the aileron hinge flange layups. For each
> aileron, my manual calls for 2 pieces of of BID (cut at 45 degrees as
> usual) "full length" by 100m wide. The full length of my aileron is
> about 1540mm, but the longest piece of BID 100mm wide I can cut from
> a 1-metre width at 45 degress is about 1315mm.
>
> Do I cut it somewhat wider than 100mm and stretch until it is the
> right length (hoping it hasn't got too narrow by then)?
>
> Do I make it in 2 pieces, with a small (what length?) overlap overlap
> at the joint?
>
> I'm inclined to cut pieces 900 long and 640 + overlap (say 670 for a
> 30mm overlap, which feels good to me). The longer pieces would be
> used at opposite ends on the first and last layers, so that the
> joints are not on top of each other but are not so far off-centre as
> to interfere with the hinge area and cause extra thickness there.
>
> Any thoughts would be welcome - including the official factory line
> on this! I have the second aileron to fettle up ready for the layup,
> so hope to have answers by the time I've got that ready.
>
> regards
>
> Rowland
>
> | Wilma & Rowland Carson <http://home.clara.net/rowil/>
> | <rowil@clara.net> ... that's Rowland with a 'w' ...
--- Steve Hagar
--- hagargs@earthlink.net
|