Any of the pusher jets like these wether turbine fan prop will pitch nose as throttle increases so down thrust is proportional to how high off the wing centerline powerplant centerline is located. Then CG and powerplant HP factor in to degrees. Not really a function of stab heat.
Ill get a pic at lunch been to long but BVM will have the solution pre engineered in OEM assembly pieces if everything is OEM.
Thanks Mike. I think you're misunderstanding my question.
I had several Nitroplane Falcon/Bobcat in all three sizes.What I experienced was that when flown as a propjet the prop stream carried above and below the horizontal stab. In that configuration there was little to no pitch change with power change. But, when flown as an edf with all of the exhaust traveling below the stab, power added would cause the nose to pitch up severely. The concensus at the time was (and I think correct) was that the high speed airflow under the stab was causing downward "lift" at the stab, which of course raised the nose. If a long exhaust tube was added to carry the exhaust past the stab, the problem went away, or you could tilt the fan up in the front to create nose down pitch when power was applied.
It looks to me from pictures that the BVM Bobcat as a turbine has some nose up angle on the turbine installation.
If that's the case, a normal edf installation would need even more. So Im looking for that info to get ahead of any pitch changes that I may have to desl with. Thanks again for your interest and advice. Lee