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Old 08-29-2011, 04:16 AM   #1
payne9999
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Default Mounting Smaller motors (250 and 300 size)

I am doing my first twin project and it will be a rather light plane. So far I have been using 400, 450 and 480 size motors. These motors all have very similar mounting plates.

The Park 250 and 300 motors have the shaft coming out the back of the motor (where the mounting plate goes) and an annoying prop saver on the front. Above the 300 size all the motors appear to have the shaft protruding out the front of the motor.

The manual that comes with the Park 300 has a prop adapter but does not explain how to convert it to a prop adapter from the prop saver.

I am fairly new to electrics and maybe it is obvious but I don't see it. I don't get how the smaller motors are supposed to be mounted.

Thanks,

Dave
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Old 08-31-2011, 03:39 AM   #2
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Park 300 is configured for mounting in front of a firewall... use the prop saver....

....or behind the firewall, using the collet adapter on the exposed shaft (replace the O-ring screws with set screws)
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Old 08-31-2011, 01:26 PM   #3
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So, mounting to the back of the firewall, I am assuming this means the motor mount box needs to be open on the bottom (it can't therefore be a 5 sided box) so the motor can be mounted from behind. Also the motor mount box would need to be long enough to accomadate the motor overall length (including the shaft).

I am also thinking that in a twin nacelle there would have to be an access hatch in the nacelle for motor access.


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Dave
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Old 09-01-2011, 12:31 AM   #4
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Yes, you'd need access to fit the motor in the box initially... mount screws would go through the firewall from the front...length would need to accommodate the "prop saver" end of the shaft. Once the motor is in, you could seal up the box with an access hatch.
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