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Building Tips and technical articles. => Building techniques => Topic started by: Perry Rose on July 27, 2018, 02:20:58 PM

Title: 3/8 x 1/2 motor mounts for strength.
Post by: Perry Rose on July 27, 2018, 02:20:58 PM

I use 3/8 x 1/2 aluminum channel, fill it with 1/4 ply and balsa. Then glue it into a crutch. drill the mounting holes, install brass 6-32 (in this case) inserts and butt them up against the channel. 2.4 ounces. Bullet proof.

Title: Re: 3/8 x 1/2 motor mounts for strength.
Post by: john e. holliday on July 28, 2018, 10:28:29 AM

Driill holes in the section behind the fire wall and remove more weight.   You can also taper it behind the fire wall. D>K

Title: Re: 3/8 x 1/2 motor mounts for strength.
Post by: FLOYD CARTER on July 30, 2018, 10:09:18 AM

You can do the same drilling holes and tapering with hard maple to save weight.  The 1/2" edge of maple provides lots of glueing area to your fuselage doublers.  This is important for transfering engine vibration to the fuselage structure.

Title: Re: 3/8 x 1/2 motor mounts for strength.
Post by: Ken Culbertson on July 30, 2018, 01:38:53 PM

Quote from: Perry Rose on July 27, 2018, 02:20:58 PM

I use 3/8 x 1/2 aluminum channel, fill it with 1/4 ply and balsa. Then glue it into a crutch. drill the mounting holes, install brass 6-32 (in this case) inserts and butt them up against the channel. 2.4 ounces. Bullet proof.

This is a very good idea.  Have you tries making it adjustable for swapping engines?

Ken