I was wondering how many Gs RC heli's pull...so I made a unit that logs accelerometer data at 750hz. This is the video of the results. The solid white bar is filtered data but the peaks are from non filtered data. So the max Gs are not exactly known but it looks like a 10G punch out and 15-20G peaks elsewhere.

I tried to log data on Matt's Logo600 but the file system got corrupted and he stripped the main gear.

I also logged data on Caleb Phillips' insane Logo400. It peaked between 18 and 22Gs. I'll post the video but there is a lot of noise on the data because we didn't mount the unit well.

My Trex500 peaked between 12 and 18Gs.