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cm to fuselage reinforcement

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rowlandcarson(at)gmail.co
Guest

Posted: Fri Jul 16, 2010 4:54 am Post subject: cm to fuselage reinforcement

The manual calls for BID reinforcement of the 

joint between the cockpit module and the firewall:



"Scuff sand the firewall and the cockpit module's 

flanges abutting the firewall in preparation for 

bonding. Lay-up three plies of 'bid' at +/-45°, 

lapping a minimum of 2.5 cm (1") onto each part. "



It doesn't seem clear to me whether the areas to 

be reinforced include the bottom edge of the 

forward face of the rudder-pedal support flange 

as well as around the sides and top of the 

tunnel. It could be argued that the forward face 

of the rudder pedal support flange is abutting 

the firewall but I would have expected an 

explicit call-out of that.



So is the BID reinforcement required only around 

the 3 edges of the tunnel, or out across the 

footwells too?



Next, the BID strips at the rear of the cockpit 

module. I assume they just go transverse, and are 

not taken around the corner into the central 

tunnel. The build manual (p17-6) does not say how 

wide these strips should be, but I assume that a 

1" (25mm) overlap on each surface, as for the 

CM-to-firewall strips, is OK.



I'm asking these questions here because 

Kirkbymoorside doesn't seem well-set-up to deal 

with technical queries as present.



in friendship



Rowland

-- 

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| <rowlandcarson(at)gmail.com>            http://www.rowlandcarson.org.uk

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gregoryf.flyboy(at)comcas
Guest

Posted: Fri Jul 16, 2010 8:50 am Post subject: cm to fuselage reinforcement

Hi Rowland,



I remember scratching my head there too, and for the same reason. Not sure

what others did, but I can report on my version of what the manual meant to

say.



In the front, I only used the plies at the top and sides of the tunnel only,

not at the rudder pedal flanges (only 3 areas of ply).  The lower end of the

side re-enforcement plies, stopped at the start of the upper part of the

rudder pedal flange.



In the Rear, they were kept transverse, and the bid strips stopped at the

corner before entering into the tunnel, though it would only add strength at

a slight weight penalty.



I assumed the manual meant 1" overlap in the rear as well, though mine were

a bit over 1" overlap, to clear the flox corner.



Regards,

Greg

____________________________________________________ 


--> <rowlandcarson(at)gmail.com>



..

So is the BID reinforcement required only around the 3 edges of the tunnel,

or out across the footwells too?



Next, the BID strips at the rear of the cockpit module. I assume they just

go transverse, and are not taken around the corner into the central tunnel.

The build manual (p17-6) does not say how wide these strips should be, but I

assume that a 1" (25mm) overlap on each surface, as for the CM-to-firewall

strips, is OK....



in friendship



Rowland

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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