Considering McFadden-Style Motor Mounts

Posted Fri, 02/19/2010 - 05:58 by Brian

After a recent facebook exchange with Greg McFadden I noticed his February 7 post on RC Naval Combat showing the work he is doing on his SMS Baden. I really like how he integrated the motor mounts into the stuffing tubes. Its basically a two component setup - the first is a bracket that allows him to easily adjust the distance of the motor from the prop-shaft - this makes it easy to use a belt to drive the propellor. It also allowed him to place the motors aft of the stuffing tube (something I am going to also probably need)

 

The second part is a nice block that allows him to use a screw to secure the prop-shaft in the stuffing tube. This will be needed with the motor's bracket (above) being securely attached to the prop-shaft.

   

This is a very nice setup. Check out Greg's other posts about his SMS Baden.

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Comments

Drew's picture

Re: Considering McFadden-Style Motor Mounts

by Drew - 02/21/2010 - 22:13

I would feel better about this arrangement if the end of the motor shaft was bearing supported.  The motor's bearings are not designed to support those kinds of forces.  It appears that his motor mount is a custom machined part so a bearing block to support the shaft shouldn't be much of a problem.  He also should have rotated the motor and used all four motor mounting screws to secure it.  It has been shown many times in the helicopter world that using all four screws is required to prevent the motor from moving when the drivetrain is loaded up. 

I can't see what the purpose of the huge screw is.  Is that huge screw there to simply secure the stuffing tubes in place?  It seems odd to me to use such a large screw to secure the stuffing tube but the motor mount is secured to the stuffing tube with a small setscrew.

Brian's picture

Re: Considering McFadden-Style Motor Mounts

by Brian - 02/22/2010 - 06:39

I believe you are correct about the use of the large screw. My guess is the larger screw was to make it more accessable when the rest of the internals are installed.

Brian's picture

Re: Considering McFadden-Style Motor Mounts

by Brian - 07/18/2010 - 20:00

Nassau now has a very crude version of this motor mount. You can read my post about it here.