Any tips on drilling the mast?

Im almost at the stage where i need to drill my Gong mast.

Any tips greatly appreciated. Whats the best practice? any special ways to seal or protect the cables from rubbing what i assume to be a fairly sharp surface?

Thanks in advance

I used a milling machine which made it easy. I then used a rotary tool to round all the edges so that the cables would not get cut. After that I used nail polish to coat the untreated aluminium so that it would not corrode.

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I make the hole in an angle to make routing the cables easier:

@Riwi great tip. did you add any seal or protection for the cable?

is there a perfect distance - foil - motor? or is it as low as possible without fouling?

No, just follow @Jezza’s recommendation.

I not sure. I leave approx 2cm between duct and fuselage/stab.

I also left a little gap of 1.5 - 2cm that would allow for a bigger prop. If you have no duct, a small gap to allow some flex of the motor/fuselage to avoid the prop to hit the fuselage/rear wing might be a good idea.
In general: as low as possible to keep the prop under water.