Doc,unfortunately your earthlink website is blocked to me, the one you posted at AvHistory anyway! So there is another reason I can't comment on it.Ian

I tried to acess the site as well, but on dial-up I just couldn't make any headway...The ground effect offset will do very little to help until the engine and cog are both optimized.

Ah but for it to flip it needs lift. So where does that come from. Thread continues at:http://www.avhistory.org/scripts/MegaBBS/t...eID=10945#10945Ian

>ok, thanx again. i will go study the 737 file. while i am a>novice at this i do have a phd in physics and spent 25 years>simulating nuclear explosions,coupled global ocean/atmospheres>and high power magnetohydrodynamic implosions. I skimmed over a WEB site that told a lot about nuclear devices. Dimensions, materials, yield, etc. All based on unclassifified info. I'm also running the Oxford U. global simulation, they have a lot of WEB computers working in parallel. I'll probaly see you at avsim. I hacked the FD for aports car some time ago. One really has to set S, wing area. A lot of Stability Derivatives are scaled by q*S. Including drags. I used the top area of the auto for S, then set Cdo to give a nominal CD for such a vehicle. Probably about 0.35 for the vehicle I modeled. One can get any zero AoA CL. Just a matter of moving Clo up/down in TBL 404. Lift Slope is also important, it's probably rather low of s cylindrical body + spoiler(if any). Cmo sets the zero AoA Pitching moment due to aerodynamics; one will also adjust the CG relative to the Center of Lift, wheels etc. Pitch Trim gives an adjustable pitching moment that could be changed during operation to find a good value. Then, the value could be set to zero and the 'good amount' trasnferred to Cmo, or with a change in CG. I had to leave some horiz stab and vertical tail Stability Derivatives to keep this auto stable. I think I also had to set some MoI's higher than realistic to keep the simulation stable. The acceleration and maximum speed are easily calculated from basic physics. One problem is that rolling drag is excessive in MSFS, exactly 0.05. However, aerodynamic drag will predominate once you are up to 100 mph or so. Setting the speedbrake/spoiler surface with a high Cd would approximately emulate a parachute. I assume the real Mach 1 vehicle used one. One could make the 'chute' drag more realistic by driving the 'speed brake' with a gauge. >how about putting an elevator at the cog and controlling trim>vs airspeed with and xml guage?>later...doc You can also set a pitching moment by setting the horiz stab at an angle. However, it stays at the constant value set in aircraft.cfg. Many aircraft.cfg values have no effect. Location of the horiz stab is approximately (Cm_dh/Cl_dh] * c_bar (MAC). So, adjusting Cl_dh changes the effective moment arm and effective location of this surface. RAF

there's no restrictions i know of on that webpage. you might turn off java to speed it up. i will put the thrust stuff on my download page which is hosted elesewhere and has no extra java junk.http://66.49.163.218/fsdownload.html doc

OK, got in there. so what are .api and .eod for?The Thrust SSC at 8MB was a bit big to DL for later perusal.Hope you are sorting out your problems. Just switch the lift off using T401 and T404.Ian

i have made some progress on this problem. with help from ron and tom goodrick i was able to modify table 404 and get some force holding the car down and stiffening the dampers on the gear made it bounce less....doc