RCU Forums - View Single Post - Contra Rotating Propeller Drive for f3a 2m Pattern Planes

10-07-2016 | 11:11 AM

#1711

Henning

Joined: Jul 2005

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From: Oslo, NORWAY

Quote:

Originally Posted by Henning

Hi,

I changed the needle back support bearing to two high quality 6x10x3 mm ball bearings + a spacer to fill the gap in the plastic case. The spacer I used is a centre ring from an APC propeller. The spacer is 9.5D x2.5 mm and with one round of plastic tape it fits perfectly. The fibre glass plate I am using is 2 mm so this adds up to a perfect fit. After installation i have zero play in the back support.

Test flight hopefully tomorrow.

Br,
Henning

Hi,

I flew 1 round P17 and 6 F17 today. The change from the supplied sloppy needle bearing to two tight ball bearings had two positive effects. The plane rolls more axial and the noise level is reduced.

The next to try is mould some air inlets that directs the air to the front of the motor where it is at its hottest. I will also cut a new front mounting plate in aluminium to replace the current one I cut in fibre glass. The aluminium plate will act as a heat sink for the motor.

Br,
Henning

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