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Old 11-10-2015, 12:02 AM   #1
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Default Firewall attachment

I am new to foam rc planes. Just finishing a Flite Test scratch build and have a question about attaching the motor mount to 1/8 inch plywood firewall. The motor I am using is a Emax 2805 with a 2S battery. Prop will be either five or six inch. Are the four screws used to hold the motor mount in place adequate, or should a second means of attaching the motor mount be used as well?
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Old 11-10-2015, 12:07 AM   #2
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The fours screws will be sufficient. I can't say I have used any more than that in any setup I have done.
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Old 11-10-2015, 12:13 AM   #3
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Worry more about the glue holding the firewall on than the screws holding the motor to the firewall.

ONE screw has the strength to hold the motor onto the airplane. But wouldn't prevent it from moving in all sorts of ways.

2 might hold it and be flyable (if its the correct 2). The others are essentially there to ensure the motor doesn't move at all even if one falls out.
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Old 11-10-2015, 08:42 AM   #4
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As others say ....

Basically one screw will be stronger than the foam to ply joint.


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Old 11-10-2015, 12:02 PM   #5
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You really should use bolts & nuts with washers so the ply is just clamped. 1/8 is not really thick enough for wood screws to hold securely.

And just to show you can manage without any screws this Emax 2805 mount is simply glued in between the layers of a 4 ply balsa bulkhead.
Name:  BalsaFwall.JPG
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Size:  217.0 KB
Name:  Balsa4Ply.JPG
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Size:  190.3 KB
It hasn't failed yet!

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