Moose: Upgraded side engine mount structure
Posted: Sun Feb 19, 2012 3:57 pm
I just uploaded an annotated picture to area 107 S/M-Fuselage showing all
the upgraded structure I added to the side fuselage engine mount (Ref
chapter 9-5 SR2500 Fuselage Assembly, pages 5 - 7 for the standard
assembly).
Why did I do these upgrades? The standard side engine mounts consist of a
piece of 0.125" aluminum channel that sandwiches a piece of 0.250" channel.
The sum total of 0.375" is about 5" long and is riveted to total skin
thickness of 0.072 (0.040 plus a 0.032 doubler). I started to look at that
and wondered why have such a disparity in strength / structure. Anyway, at
a total weight of perhaps 8 to 10 ounces per side (and forward of the datum
line to boot), I added all the additional structure. Now, the side engine
mounts are -really-tied into the door post and seriously reinforced. Maybe
overkill, but again not that much additional weight for a whole lot more
structure.
Ted Waltman
Moose N384JP
(getting close.<grin>)
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the upgraded structure I added to the side fuselage engine mount (Ref
chapter 9-5 SR2500 Fuselage Assembly, pages 5 - 7 for the standard
assembly).
Why did I do these upgrades? The standard side engine mounts consist of a
piece of 0.125" aluminum channel that sandwiches a piece of 0.250" channel.
The sum total of 0.375" is about 5" long and is riveted to total skin
thickness of 0.072 (0.040 plus a 0.032 doubler). I started to look at that
and wondered why have such a disparity in strength / structure. Anyway, at
a total weight of perhaps 8 to 10 ounces per side (and forward of the datum
line to boot), I added all the additional structure. Now, the side engine
mounts are -really-tied into the door post and seriously reinforced. Maybe
overkill, but again not that much additional weight for a whole lot more
structure.
Ted Waltman
Moose N384JP
(getting close.<grin>)
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List administrator: mike.davis@dcsol.com
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