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Old Oct 06, 2011, 11:44 AM
Brutus1967 is offline
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I convince things to work
The Netherlands
Joined Nov 2009
4,613 Posts
This problem can be tackled a lot easier and simpler, involving less cost:

Parts needed: 4 bearings 6 x 2 x 2.5 mm

Tools needed: Drill (preferrably 5.9 mm, but 6 mm is OK)
When drilled with 6 mm, it can be necessary to secure the bearings with some loktite or similar. When drilled with 5.9 mm, the bearings need little force to be pushed in place but will stay there without further securing

Just drill out both guidepulleys with 6 mm (or 5.9 mm) and install TWO bearings 6 x 2 x 2.5 mm bearings in each pulley. Shorten the plastic distance bushings accordingly and with a minimum of fuss your chopper is airborne again, with the same results.
The toothed pulley is nice but not a must have, provided the belt is tensioned as loose as flying allows.

It helps to keep headspeed to a sensible max 2000 RPM (for a fourbladed head this is sufficient even for non stabilized flight), and when shortened mainblades of a Blade mCPx are used as tailblades, tail authority will be dramatically improved compared to even original tailblades together with a headspeed of 2500 plus.

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Last edited by Brutus1967; Oct 14, 2011 at 06:07 AM.
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