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 Posted: Fri Aug 14, 2009 3:42 am Post subject: Lightning C.G. Change? + question for Johnny Thompson |
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Clive C You're right C I can just do the math on to get the CG change between the long and short mounts. I do remember a post where Buzz said that the cg did not move a lot with the new mount. The other part is that I just didn't know whether or not Greg's plane had the newer mount. I had also forgotten about the lead weights that he added. I could also do the math on this C but I'd need to know the weight and stations of the fuselage and wings separately. That way I could "virtually" change out the old fuselage with the new. Three inches of cg movement is huge C but remember when we're talking about so much extra weight throughout the fuselage and all of it aft of the cg C then it starts adding up quick. Thanks for the quick responses guys. Brian W.
[quote] Subject: RE: Lightning-List: Lightning C.G. Change? + question for Johnny Thompson
Date: Fri C 14 Aug 2009 08:15:59 +0100
From: clive.james(at)uk.bp.com
To: lightning-list(at)matronics.com
Can't you just use the standard spreadsheet and take the engine weight
off at the old station and put it back at the new one?
I used this approach to see what the difference was with the new mount
that Arion send me. Early indications was the engine would be just over
an inch forward of it's old position so I used 30 mm
If you take the two lines in yellow out you can see the resultant C of G
move back. I was surprised how little the C of G moved with engine
position movement.
Or am I missing something?
Regards C Clive
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