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Engine Positioning

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Engine Positioning

Old 12-12-2004, 11:20 AM
  #1  
njjd
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Default Engine Positioning

I am in the process of building a Tiger 2. The motor mount supplied with the kit allows for a significant fore / aft positioning of the motor (holes need to be drilled for the mount and do not allow adjustment once in place). The plans do not indicate a preferred fore / aft position.

The motor being installed in a GMS 47.

I believe the motor should be positioned to help balance the plane. Indications from other posts on RC Universe indicate the plane to be tail heavy and as such suggest the motor to be mounted as far forward on the mount as possible. Any problems with position as far forward as possible? Any suggestions on how to approximate the balance point prior to final assembly.

Thanks for all your help.

Neil
Old 12-12-2004, 01:34 PM
  #2  
khodges
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Default RE: Engine Positioning

I'm not real familiar with the Tiger. Does it have a cowl?. If so, the engine should be mounted so that the prop flange is about 1/8 inch proud of the front of the cowl. If there's no cowl it's not as important, but leave enough room behind the engine for fuel lines to exit the firewall. Mount the engine so it's roughly centered on the mount arms. All the way out will put a bit more stress on the arms than all the way back, and if there is any right thrust, it should be placed so that the centerline (looking down from above) runs through the engine shaft at the point the prop is mounted. You can move the Rx and Rx battery around for final balancing.

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