I suppose you are saying the 'manufactured' boat you have does not plane? you say the thrust is VERY negative; does this imply the craft does not perform? because you also said that any negative angle will keep the boat from planing. which is it? you seem to have contradictied yourself, or passed it off as an exception;
What I
should have stated about it was ENGINE LOCATION. On an AIRBOAT , if the engine is mounted at the furthest back area possible , then YES , a NEGATIVE thurst WILL cause BLOW-OVER ( front raises up - transom gets pushed down ) With the hull I am referring to , the engine is mounted more towards the center and is tractor driven . ( and I was NOT contradicting myself ) And seeing as to HOW the hull does NOT sit "flat" in the water , then , yes , by all means , THIS is how you have to adjust the ride attitude of the hull . ( which ALSO applies to ski'ing and surfing - hence the reason WHY the rider(s) have to keep shifting their body weight and or position )
And back to the surfboard and now ski's . Since the source of movement is CONSTANTLY changing on ski's ... it does NOT relate . And with a surfboard CONSTANTLY having its CG relocated , this too , does NOT relate .
I was not trying to get this into a crapper session , but , one last note ... if the thrust angle and engine postion and location does not have a direct effect on the hulls ride attitude , then kindly explain to me WHY , there are SO many airboats that HOP ( porpoise ) whilst , others do NOT !
And FTR - do NOT compare REAL life-size airboats to the little guys we run .