Also, unless my understanding is wrong, it's also a modification to the motor, meaning it's only allowed to fly at Tripoli Research (EX) launches, not NAR or non-Research TRA launches, right? LDRS this year, for example, won't have any EX days.
Yup, You'll have to join Tripoli to fly HEI at a community launch. If you do the channelized version then you could fly NAR. Kurt