GWright6970
02-16-2014, 09:50 PM
Question on fit.... the motor mount to the airframe.
There are obviously five points of connection to the airframe. So here is the background to my question:
I put a bolt in the bottom motor mount hole, and pass it through into the airframe mounting hole as a starting point. Then the two side points get bolts, and they align pretty well darn well with the bottom. There is also a wee bit more flexibility in these arms on the motor mount, so it makes for an easier alignment with the airframe points.
The top two points of the motor mount do NOT align very well with the airframe points. The aircraft top right (starboard) motor mount point is slightly low and outside by about an 1/8th of an inch. It is also about 3/16 of an inch away from the frame.
The left side (port) is a full bolt diameter, about 1/4 of an inch low and inside from the airframe attachment point and about 3/8 of an inch away from the airframe plate.
I can spread the top two arms of the motor mount, without mechanical assistance, insert two bolts and make them align, except for the distance away, which I read we can use washers to fill.
QUESTION: Is it acceptable to have some strain introduced on the top motor mount arms by spreading them about 1/4 to 5/16th of an inch?
Thanks for your replies!!
There are obviously five points of connection to the airframe. So here is the background to my question:
I put a bolt in the bottom motor mount hole, and pass it through into the airframe mounting hole as a starting point. Then the two side points get bolts, and they align pretty well darn well with the bottom. There is also a wee bit more flexibility in these arms on the motor mount, so it makes for an easier alignment with the airframe points.
The top two points of the motor mount do NOT align very well with the airframe points. The aircraft top right (starboard) motor mount point is slightly low and outside by about an 1/8th of an inch. It is also about 3/16 of an inch away from the frame.
The left side (port) is a full bolt diameter, about 1/4 of an inch low and inside from the airframe attachment point and about 3/8 of an inch away from the airframe plate.
I can spread the top two arms of the motor mount, without mechanical assistance, insert two bolts and make them align, except for the distance away, which I read we can use washers to fill.
QUESTION: Is it acceptable to have some strain introduced on the top motor mount arms by spreading them about 1/4 to 5/16th of an inch?
Thanks for your replies!!