At 06:54 AM 2/10/2014, you wrote: >Everyone I have ever talked to concerning belly boards always >experienced a nose pitch up attitude. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Just a hunch but I'm guessing the rear spar location, being behind the CG and CL, might have a bit of a stabilizing factor over the forward spar location which is directly on the CG location. Then again, it may have a bit of de-stabilizing factor with the turbulence it creates. I guess that's what testing is all about. Larry Flesner