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Building Tips and technical articles. => Building techniques => Topic started by: Rob Killick on April 07, 2013, 03:04:34 PM

Title: Motor pads ?
Post by: Rob Killick on April 07, 2013, 03:04:34 PM

Hi ,

Newb question time  ...

I've installed 1/8" thick aluminum pads on the motor crutch (inverted motor mounting) and I was wondering if all I have to do is move the nose ring to accommodate the new spinner , back plate location ?
All I see different , is the motor center line (profile view) is 1/8" lower than the plan original , profile center line .
Will this cause any problems ?

Thanks ,

Rob K.

Title: Re: Motor pads ?
Post by: Paul Wood on April 08, 2013, 07:20:59 AM

Rob,

I would be aware of the tank location in relation to the engine.  As far as vertical CG and flight performance, I wouldn't think the difference would be noticed. 

Paul

Title: Re: Motor pads ?
Post by: Tim Wescott on April 08, 2013, 08:39:50 AM

I've never put pads in a full-fuselage model (I haven't built more than one!!).  I'd keep the engine in the same place in the plane, though, either by relieving the bearers where the pads go, or moving the bearers up.

Taking a spin through as many build threads as you can find in "Building Techniques" and seeing what was done should give you some ideas.

Title: Re: Motor pads ?
Post by: Doug Moon on April 08, 2013, 02:08:16 PM

what plane is it?

Title: Re: Motor pads ?
Post by: Rob Killick on April 08, 2013, 03:08:05 PM

For Doug's question  ...

The  model is C. A. Mackey's Blue Bird . with a Brodak .25 for power .

Tim ,

The aluminum pads  aren't adhered to the  maple mounts , other than the mounting bolts and engine lugs , holding them to the maple .

Thanks for viewing my post ,

Rob K.

Title: Re: Motor pads ?
Post by: Doug Moon on April 08, 2013, 03:44:40 PM

If it is not an in line design I would be tempted to just roll with it.  Make the adjustment to the nose ring.  Make sure there is enough room to adjust the tank down another 1/8 that you have lowered the motor.  1/8" is probably not noticeable. 

At the same time maple beams are plenty hard enough to handle a .25 without much crushing. 

Its your choice but I don't think you run into problems either way.

Title: Re: Motor pads ?
Post by: Rob Killick on April 08, 2013, 05:41:42 PM

Gentlemen ...

I think I will go with the plain maple mounts and build as per plan . Maybe with more searches , I can get a better idea of what should be done to te front end of my future models . y1

Thank you very much ,

Rob K.