Well gotta agree with the big D on this one. If your going to gear it and run a much bigger prop. Static thrust on a 26" prop is useless info. This is one time where rated HP means something. You pick your prop and adust the gears untill the engine runs at peak HP at WOT.
For what its worth mine is turning a Zinger Pro 26x10 @ 6200. You should be able to find a thrust program on the net to translate those numbers into a SWAG for thrust.