Some Tests I have done
As the P3D user who experience getting stuck on an airfield, I post my findings on this issue.
I tried numerous edits of the airfield in question (adding exclusion rectangles, and flattens at runway elevation) to no avail. At some stage, quite by accident, while the plane was creeping forward I managed to swing her into the wind, and suddenly she took off across the field. Subsequent tesst showed that with a direct cross-wind or tailwind component, the MAAM SIM DC3 will not budge in P3D. Makes taxing impossible downwind to get to the downwind end of a runway!
I have experienced a problem before in P3D with the Lockheed Connie (P3D default plane by JustFlight - I assume it is an FSX port-over) and their DC6. Sometimes they require a very high thrust to "break away" from a stop / parking (once they get moving one has to hit brakes hard and throttle back to avoid tearing down the taxiway). Now I know why the problem is intermittent! Last night I tested both these planes extensively on a paved runway. With a tailwind of 8 kts, one has to open up the throttles to high MAP at full RPM and they will creep forward, slowly gain speed, until KIAS = windspeed (+-10kts), then there is a definite "kick", and the plane springs into action. Same with a quartering tailwind to cross-wind. With a headwind, less than half the amount of MAP and RPM in the green will give a smooth, steady acceleration from standstill.
The MAAM-SIM DC3 will not budge, or will barely move with a tailwind and cross-wind. The Manfred Jahn DC3 behaves exactly as I would expect - regardless of wind direction the plane will get moving as required, with reasonable throttle inputs.
OK so takeoffs downwind are not recommended for a DC3, though up to 10kts is apparently do-able, and I am sure many military pilots have had to do this on occasion for real (and I could do it perfectly in the Manfred Jahn DC-3). Certainly one should be able to taxy downwind, and enter a runway with a cross-wind, without having to almost burn out the engines!
To expect other P3dD users to validate my experience with the MAAM-SIM DC3 is asking a bit much - the pain of installing, and I know some users are very concerned about damaging their P3D installation or installing non-P3D compatible / tested aircraft. However, if someone has the time to taxi the Connie installed with P3D around a bit, against different wind directions (note in testing one must stop, and try to get moving again; once rolling one can keep going), I would be grateful if you could report on your findings.
It will at least put my mind to rest that it is not my install of P3D that is wonky, but will also give us a test of airplane compatibility with P3D. Flight dynamics programming by the likes of Alex Metzger (Manfred Jahn DC3) are what we want in a plane that is said to be / marketed as P3D compatible (no criticism of the MAAM_SIM team at all, as that was a feat of sim engineering in its time, long before P3D was even dreamed of)
Rob