As in all things, YMMV…
But here is what I found around the interwebs. @dcrainmaker also did some testing w/ GoPro stuff in the wind tunnel. Arriving at similar numbers.
So first, @gopro bring back the session. Please. Second, the Hero8 does not require a frame anymore and has relatively smooth edges when compared to previous iterations, esp the ones requiring a frame to mount. Having said that, the form factor of the 8 is very similar to prior versions so i cannot imagine the drag numbers have really changed all that significantly.
Everything is a trade off. Workable footage to do post race analysis or 1.5-2W extra during the race?
WRT battery life, shooting 1080p60 will increase battery life to the length of most US pro 1/2 crits. Road races you’ll have to pick and choose when you are shooting I think.
Screenshot from above vid, getting right to the numbers:
