I have a spare 18h alu tubular rim, that could be used for some experimentation. The thinking is to use it as a rear wheel, with a 2:1 spoke pattern (2 cross DS, radial NDS).
Common 2:1 hole counts are 16:8 for BHS hubs, and 14:7 by Fulcrum/Campy.
What I would like to do is drilling an extra hole between each other, so I'd end up with 18:9 spokes. I'm planning to use a 36h hub, and skip every second hole on the NDS.
Could anyone weigh in on this approach, are there any obvious problems?
I highly advise against lacing a standard hub with so many holes into a 2 to 1 triplet rear wheel.
Because there are a lot of holes drilled into the flange, there is very few material left.
Lacing this flange with half the spokes will cause the flange to break because the spokes will be twice as tensioned as they normally are. That is OK as long as the hub is drilled specially for this. That is not OK with a normal hub, especially with so many holes.
If you want anyway to give it a try, do not lace radially the non drive side flange. The failure would happen very quickly.
You would better have to cross the spokes 1x. But even with a crossed pattern, I'm sure the hub will break soon or late.