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Baggage bay strengthening for gear

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gregoryf.flyboy(at)comcas
Guest

Posted: Mon Jun 21, 2010 2:27 pm Post subject: Baggage bay strengthening for gear

Hi all,



My question pertains to which surfaces are covered for strengthening, in the

baggage bay.



After searching the list, no answer was found. It makes me wonder what it

is, I am not seeing. 



A) '2 plies of bid at +/-45 degrees over the entire area of the baggage bay

up to the level of the top of the

central tunnel.'



This one seems self explanatory: 2 plies to 5 faces of the baggage bay:

front, rear, sides, and bottom.



B) (and my question #1)



'Next add 2 plies of 'uni', to the same height, onto the baggage bay rear

bulkhead from the sidewall to

the central tunnel, with the fibres running spanwise.'



#1 Does this mean uni is only on one face of the baggage bay (the rear

face), and no overlap on the two side faces or bottom face? 



OR



Does this mean uni is placed on 3 faces of the baggage bay (rear and sides),

with no overlap to the bottom and front faces ?



OR 



Something else??

#2  Is there any builder out there, that was able to massage the two plies

of BID over the whole of the baggage bay 'well', without any cutting or

folding?



I look forward to some help here,



Greg

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gregoryf.flyboy(at)comcas
Guest

Posted: Tue Jun 22, 2010 8:56 am Post subject: Baggage bay strengthening for gear

Maybe I should rephrase my question. Instead of what the manual is saying,

what did people actually do with the uni? Is it really meant to be only on

the rear bulkhead only, with no overlapping onto the side bulkheads? If in

doubt, I am talking about the strengthening the baggage bay 'box' to be used

for the gear, and am really only looking for verification , of what others

have done, before doing the layup, so as not to mess it up. There might be

more than one way to do it. Any of my questions answered will help...   So:

How many 'faces' of the 5 sided box have people put the 'uni' in when they

installed the gear? Hey, no question is a dumb question, if you're not quite

sure what the manual is saying, is it?



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craigb(at)onthenet.com.au
Guest

Posted: Tue Jun 22, 2010 9:12 am Post subject: Baggage bay strengthening for gear

greg



I read it as your option #1. and to answer your question about the bid in

one piece for the whole

job in the well, yes i managed it, but some of it was rather stretched and

other bits compressed,

but not folded, one little trick i worked out, if you have access to plastic

shopping bags,

I had about 200 used ones in the cupboard, i stuffed them into the well till

i couldnt fit any more then put

a lump of lead in there for good measure, after i did the layup, other than

the small lines in the resin

from the plastic bags, it came out looking like it was vaccum bagged.

another trick i have discovered

for those difficult bits where the glass wants to lift, if you cover the job

in plastic and then compress

a piece of sponge rubber onto/into the offending hole the job again comes

out like a vaccum bag job, excess

resin is forced out as well as the air, leaving a beautifull job.



or atleast that has been my experience



regards



craig

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gregoryf.flyboy(at)comcas
Guest

Posted: Tue Jun 22, 2010 4:16 pm Post subject: Baggage bay strengthening for gear

Craig,



So uni is only on the rear 'face' of the gear well. Suprising it doesn't lap

onto the sides at all.



Since you were able to make it work, I think I will go the non-cut route

then, for the glass in the well. 



I like your plastic bag solution. I saw it, while searching the site

extensively about my 'uni' question. I don't have as many plastic bags, so I

think I will replace most of the bags with old newspaper, leaving bags on

the edges. Should make for a neat job.



Thanks for the info.



Greg



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jglazener

Joined: 14 Apr 2010
Posts: 76
Location: Schoonhoven, Netherlands

Posted: Tue Jun 22, 2010 11:58 pm Post subject: Re: Baggage bay strengthening for gear

Greg,



For your second point, the uni goes over front, bottom and rear, and to the top of both bulkheads. The rather cryptic description in fact says it should be BETWEEN the the two sides and NOT lapping on to them.



As far as putting the large bid in in one piece, forget it. With a lot of force you may be able to squeeze it all in but all you will get is a heavy ball of resin rich fibre which contributes little strength. Start on one side, smooth it out and then you will find the bid starts bunching up on the other side. Cut in and take one or two triangles out. Make sure the ends overlap well and you will have a neat and structurally sound lay-up with the fibres seated properly.



That said, it is still the most horrendous job of the build (so far..)

see  http://www.europaowners.org/forums/gallery2.php?g2_itemId=44767



Wishing you success and patience, Jeroen

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gregoryf.flyboy(at)comcas
Guest

Posted: Wed Jun 23, 2010 2:12 pm Post subject: Baggage bay strengthening for gear

Jeroen,



 Geez!!!! Rather cryptic doesn't begin to describe the manuals

statement...or rather miss-statement. I just checked the latest PDF of this

chapter and they certainly don't say 'between' sidewall to center tunnel

(though I agree..that is probably what they mean-but who could know?). In my

interpretation, they say essentially to cover the rear bulkhead (i.e.. rear

'face' only) 'from' sidewall to center tunnel. So I think someone should

change the description in the manual if we are to get out of it what seems

to be the better way to do it.

 

Intuitively, it makes a whole lot more sense to me, to run the 'uni' on the

front, bottom and rear faces of the gear box....than to just run it on the

rear face only. That MUST be what the manual is trying to say. It seems that

would have a tendency to strengthen up the box to lateral forces imposed

against it, of the type that might happen by the twisting of the gear legs,

when doing a landing in which the aircraft was not quite lined up with the

runway.



Thanks so much, Jeroen!  If you had not spoken up, I would have done this

ply incorrectly. 



Now the ugly question. How many others did not interpret the manual

correctly? Not meaning to spread fear here, as it seems the boxes have

handled a lot of abuse, and the gear legs tend to fold before the box

does....but for those that didn't interpret the manual correctly (as I would

have done), better watch those crabbed landings to get the aircraft oriented

back to centerline before touchdown! Comments? Then again, don't we good

pilots do that anyway? 



I look forward to getting this most horrendous job of the build finished.



Regards...and thanks again,



Greg



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