Heres a post of a guy getting 12.5Lbs of thrust on a Saito100....thats nearly half as much as what someone is getting on the DA.

http://www.rcuniverse.com/forum/m_350358/tm.htm.

And, the DA is suppose to be the best.

We need to press our manufacturers. I'm looking for someone who can build a 50-56cc class engine that can deliver @ least 30+Lbs static thrust (i'm hoping the BME 55?) or a plane manufacturer that can build a 50cc plane @ 12-13lbs (maybe Extreme Flight?).

I need to hover @ 20-25% max and I need to pull out at 2 times acceleration @ less than 50% throttle. Otherwise its just no fun, no fun at all and you miss being able to do a good 15% of things you could with that power that just don't work with less power.