Been running a 13.5 vulcan w HT rotor in WGT for a bit, thought I would share some notes.
The Novak HT rotor is very strong. This seems to make timing and gearing changes more sensitive compared to the standard rotor. Rolling out around 80mm with 30 deg timing feels like a light switch with narrow power band. I found the higher I could roll out the stronger this combo felt. Rolling out around 90mm with 10 deg of timing on the sticker is a good point to start from. No tuned D3.5 speed, but pretty good.