Its about the max you could expect so it may be right.The last er90 I got from Hubert came with a backing plate exacly the same as one I ended up with so they must be on top of it now.He changed the intake shape & added 5mm to the tail cone & this one tops at 13.25lbs static thrust.Thats Very good I think.With my fuel injector spraying back at about 140 deg angle into the reeds I get about 50% throttle use without over heating anything.Just hope it works in flight yet.
I put a Nitro Spark plug up front right in the fuel spray out of the hot chamber & found this starts much smoother now also.Less pops & bangs.
