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Rudder packing


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I've built a new rudder blade for the Noelex.

It's a kick up, rather than dagger type.

Just wondering what is best for packing around the cheeks, so it can still swing up/down easily, yet doesn't flop around.

Discs around 350mm diameter would be ideal, to prevent the control lines from slipping down the sides and getting stuck.

I have previously used stiff mylar, PVC and similar things, happy to use same again but no idea where to find it these days.

What would people recommend, and where would I get it?

Also, does anyone know where to get thin (10mm ish) extruded polystyrene? I want to mess about with some shapes.

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Yes, used the ridiculously over built existing rudder stock. 

Blade ended up being a bit thinner by design than the old one, hence requiring a little packing. Only 2-3mm total.

Top end is majorly strong, so I can add thickness for experiments.

Will make new stock one day, but not for this winter.

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