OWB Center Hub tollerance issue.

[flyer2160]

they are very similar in size, they have to be exact as there is very little give.

[SFACV]

I have only been able to get 4 decent flights on mine so far, and a bunch of hovers for a few seconds while chasing vibes. My dampers are likely not worn in at all yet by what I am reading here. The V2 tail, the OWB hub made to fit tight on the mainshaft and blade tracking were what made mine run smooth. Last flight was dead smooth and noticeable power increase over previous flights. Vibes rob horsepower more than I would have ever believed. I found with the stiff dampers blade tracking is extremely sensitive. A quarter turn on the link tube can cause the shakes to disappear or return. With all other helis I have had they will run fine a turn out, you notice a difference if they are spot on but only a bit cleaner. With the 7HV it goes from perfect to V-Bar going nuts in a half a turn. I have had blade tracking off by half an inch on the tips (bent parts after a crash) on other helis and I have never seen a gyro or v-bar not handle it ok. I would say if everthing else is perfect go to blade tracking, take your time and do small adjustments and check.