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Old 09-22-2006, 04:41 AM   #1
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450 XL HDE Question

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I have been trying to learn to hover my new heli when after 2 or 3 lifts the tail drive pulley starts to slip and of course the heli spins. The drive pulley seems to be 2 pieces. The upper piece does not seem to slip which made the problem harder to diagnose. My manual shows a screw on top of the pulley but there is not one nor a hole to put one in. I wondered if I should glue this replace it with something better ? Any help would be greatly appreciated.
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Old 09-22-2006, 05:07 AM   #2
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There are replacements for the tail drive pulley. I would be worried if you glued it because you never know whaen it might let go again. I would replace it were me.
What do you mean , I can land upside down
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Old 09-22-2006, 12:47 PM   #3
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The pulley is in two parts and is a press fit on the splined shaft. If the gear is slipping but is fully seated on the shaft, then the pulley is bad and must be replaced. Gluing the two halves together should not be necessary (although it shouldn't hurt) - the press fit should keep them together. As Rob has said, there are good alternative drive gears available. You should note that the upgrade metal Align gear is also in two halves and is a press fit. The MH part uses a small grub screw. I have both but use the Align one - works fine.
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Old 09-28-2006, 03:56 AM   #4
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Thank You for your responses a pulley with a screw sounds like a better idea than pressed on. Still don't know why the manual shows one and I don't have one.
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