Basic airplane or motorcycle script with no brakes?

I'm a total bonehead with scripts. I'm looking for a simple transportation engine script that once you start it, it doesn't stop. No de-accel. Just go. If some kind soul would point me in the right direction, I'll just go. Thanks.

None of the vehicle scripts do that, they use energy and will eventually stop. You can make them go for a long time but they will stop. What is it for?

Actually I found a basic boat script that works great. I simply had to turn off two controls: stop and back up. I also set the speed so that you can't accelerate either. The boat keeps going and never stops, which is perfect for my project.

And another unrelated but (probably) stupid question. How do I put a sit animation into the boat script? Can I just copy and paste in a pose script within the boat script?

That's not quite true. Actual vehicle functions (as opposed to non-vehicle physical movement functions) do not use "energy". They have decay time scales (e.g. VEHICLE_LINEAR_MOTOR_DECAY_TIMESCALE) that are DESIGNED to make them stop after a while though, precisely so you DON'T have a vehicle keep going forever without active control (imagine your car smashing through shops and houses while you are busy logging back in after a crash/disconnect... ). The friction parameters can also help with that if used properly.

All of that can be circumvented, especially if you apply motor values without user control input (e.g. using a timer); the real question is whether or not you truly want to.

Try using llSetForce... you wont really be able to control the vehicle, but it seems like this might help you.