Fabricating a Motor Mount
Posted: Tue Apr 16, 2024 11:33 am
by BobDz
For those of you that have fabricated a motor mount for your Sonex, or any other aircraft, how did you go about deciding on 4130 tube diameter and thickness? Professor Google hasn’t been very helpful. I really need to find my Bingelis books. TIA if anyone can point me in a better direction.
Re: Fabricating a Motor Mount
Posted: Tue Apr 16, 2024 12:36 pm
by kmacht
If you can find someone local with a set of A model plans those plans show all the details needed to fabricate the aerovee and jabiru mounts. The B model dimensions will be a bit different but it would be a good starting point.
Re: Fabricating a Motor Mount
Posted: Tue Apr 16, 2024 1:28 pm
by BobDz
kmacht wrote:If you can find someone local with a set of A model plans those plans show all the details needed to fabricate the aerovee and jabiru mounts. The B model dimensions will be a bit different but it would be a good starting point.
Thank you
Now…
Where is Bryan…
Re: Fabricating a Motor Mount
Posted: Tue Apr 16, 2024 2:21 pm
by WaiexB22
This is probably not much help, but I did this recently for my Waiex. I ran a stress analysis and overdesigned mine. Full disclosure, I am not flying yet and I have departed way away from the recommended engine options…I am using mainly 1 and 3/4 inch OD tube with wall thickness from 0.049 to .065 depending on the location. The exceptions are two parallel bars next to my engine and the landing gear legs, which are larger diameter.
Re: Fabricating a Motor Mount
Posted: Tue Apr 16, 2024 6:24 pm
by lakespookie
Keep in mind jabiru mount offsets the nose gear so if you need some clearance that is an option, the Motor mount page includes what loads you need to meet for the motor mount so you could work backwards from that page in the plans depending on your engine selection.