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trimming fuselage upper moulding firewall flange

 
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rowlandcarson(at)gmail.co
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PostPosted: Fri Aug 01, 2014 6:14 am    Post subject: trimming fuselage upper moulding firewall flange Reply with quote

I've had the pre-bond inspections all signed off and am hoping to organise a Redux posse soon to glue the fuselage top on.

I note that the forward end flange which fits against the firewall is quite generous compared to the flanges elsewhere, which are between 35mm & 50mm wide. I'm intending to trim the flange for the firewall joint back to about 40mm, but thought I'd check to see if anyone thought that is a bad idea. There doesn't seem to be any explicit advice about trimming that area in the manual, but fig 8 on page 23M-5 seems to suggest that a 25mm flange is OK, since the BID tapes it illustrates going across the joint are only 50mm wide.

Any thoughts welcome.

in friendship

Rowland

| Rowland Carson ... that's Rowland with a 'w' ...
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Fred Klein



Joined: 26 Mar 2012
Posts: 503

PostPosted: Sat Aug 02, 2014 6:33 am    Post subject: trimming fuselage upper moulding firewall flange Reply with quote

On Aug 1, 2014, at 7:14 AM, Rowland Carson <rowlandcarson(at)gmail.com (rowlandcarson(at)gmail.com)> wrote:
Quote:
There doesn't seem to be any explicit advice about trimming that area in the manual, but fig 8 on page 23M-5 seems to suggest that a 25mm flange is OK, since the BID tapes it illustrates going across the joint are only 50mm wide.


Rowland…IMHO, it is a real stretch to interpret fig. 8 as "a suggestion that a 25 mm flange is OK”…personally, I would not consider trimming the top fuselage flange at the firewall for even a nanosecond, given its obvious contribution to the rigidity to the airframe…I read fig. 8 as an un-dimensioned illustration of the relationships of the various components at this critical intersection…nothing more...Fred

[quote][b]


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tonyrenshaw268(at)gmail.c
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PostPosted: Sat Aug 02, 2014 7:50 am    Post subject: trimming fuselage upper moulding firewall flange Reply with quote

Hi Rowland,
Will you have another can of Redux at the redy, borrowed or bought, just in case you need a little more?not a good time to find out you need more, and have to scrape a whole can off, and throw it in the bin for the sake of 5-10% more. Something to ponder.
Regards
Tony Renshaw
Sent from my iPad

Quote:
On 2 Aug 2014, at 12:14 am, Rowland Carson <rowlandcarson(at)gmail.com> wrote:



I've had the pre-bond inspections all signed off and am hoping to organise a Redux posse soon to glue the fuselage top on.

I note that the forward end flange which fits against the firewall is quite generous compared to the flanges elsewhere, which are between 35mm & 50mm wide. I'm intending to trim the flange for the firewall joint back to about 40mm, but thought I'd check to see if anyone thought that is a bad idea. There doesn't seem to be any explicit advice about trimming that area in the manual, but fig 8 on page 23M-5 seems to suggest that a 25mm flange is OK, since the BID tapes it illustrates going across the joint are only 50mm wide.

Any thoughts welcome.

in friendship

Rowland

| Rowland Carson ... that's Rowland with a 'w' ...
| <rowlandcarson(at)gmail.com> http://www.rowlandcarson.org.uk
| Skype, Twitter: rowland_carson Facebook: Rowland Carson
| pictures: http://picasaweb.google.com/rowlandcarson








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