RE: Art-Tech Shark 450
I have mine set so that it gets light on the skids at 2190 rpm and just gets airborne at 2220. This equates to 72% throttle on the curve. When I run these numbers thru it shows a head speed of about 3700 rpm at full throttle and a full charged battery. But there are a lot of losses in these sorts of calculations, so I'm guessing now probably 32-3300 at full throttle. I will some day tie it down again and get under it with my tach and give it full throttle and see what it does. It just scares the crap out of me to be that close to spinning carbon fiber and holding the tach. Your putting a lot of faith in the blade grip bolts etc. etc. Maybe I should figure out how to get the tach under it without me being there.
Edit: have you tried a piece of tape on one the tail blades to see if you can make it worse or better? I think I'd start with that and see what it gets you.