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Tightening propeller nuts correctly on small-ish electric planes

In my opinion. ;)

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Chuck Plains02/04/2017 12:43:11
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If you have to do this during assembly or repair of your plane/copter/whatever, here's my note of caution.

The aluminium prop collet/adapter/holder, has, relatively, limited strength and can be broken if you give it too much welly with a spanner or a pair of pliers etc.

Use one of these.

10mm box spanner.jpg

Using a box spanner like this will limit the pressure you can put on the prop collet.

What you can see here is just the 'spinner' part of my glider's folding propeller, but this method still applies to a regular propeller.

using the box spanner.jpg

Don't imagine that because the propeller is 10 inches in diameter you can use a 5 inch spanner on the nut. Unless you're very careful. Even with a 5 or 6 inch prop, a small spanner requires caution, in my opinion.

If you have any experience with RC cars, you probably know how small the wheel nut spanners are. My old Tamiya wheel spanners only have a 25mm cross tube for us to grip when doing up the 7mm axle nuts.

Just be sensitive to the fact that your prop is plastic and will feel soft when you use a spanner. Even the aluminium is soft, relatively.

If you feel the need to tighten it a bit more, a short piece of barbecue stick or something makes a big difference to how much torque you can apply.

box spanner torque bar.jpg

Former Member02/04/2017 13:07:43
3577 forum posts

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