Often after taxing quite a way out to a far runway, (PANC,KDEN) and I don't have traffic around I can get ATC to give me clearance for a VFR take-off, I do this with a rolling speed of about 15-19 (ground speed), this seems real, I have been on several medium to large aircraft and we taxi for like 20 minutes.....and then I know as we arc through the turn by the threshold we've got a rolling clearance, since the engines are being ramped progressively......so I guess I just want confirmation that I can do this to model real life ?

I'm not a 767 pilot, but, "Yes." It's a "rolling takeoff" and it doesn't necessarily mean the absence of air traffic. In fact, it often means the opposite. Sometimes the tower will clear you for takeoff "without delay" because the spacing is tight and he doesn't want to force a go around on the landing aircraft while you preen your feathers for takeoff on the numbers ;-)Sometimes, in the absence of traffic, as the aircraft nears the hold short point, the tower will issue a clearance for takeoff - in which case the aircraft can simply roll from the taxiway onto the runway for immediate departure. I'm sure at high altitude airports like KDEN with full load, every little extra bit of speed is a good thing for a heavy pilot. If you can already be doing 15-20 knots when you gun the throttles, all the better.J

Jase, preen your feathers, LOL :)Regarding the extra speed, that's not really correct. Especially if you're lining up at the beginning of the runway, groundspeed will be about 10 knots to prevent heavy side loads on the main gear. You will gobble up more runway at this speed than from a standing takeoff. You'll have to check your engines first by putting on about 30% thrust because of different spool-up rates for each engine (you don't want #1 being at takeoff thrust while #2 is still at 30%!). This takes time. When doing a rolling takeoff, you'll accelerate slightly, so now you're gobbling up runway at 20-25 knots before you actually increase the thrust to takeoff thrust, which also takes time. So if performance is critical, you do a standing takeoff, if necessary increasing to takeoff thrust while holding the brakes.A few weeks ago, I did a rolling takeoff in Antalya from a highspeed exit. First, of course, you have to make a tight turn onto the highspeed exit (using it as an entrance), only then can you accelerate to about 25 knots, checking the engine spool-up. But you still have to make a 30 degree turn onto the runway and the nosewheel is not made to do that at high speeds (it may skid) while your rudder is completely ineffective. We did this because traffic was on final and we'd save time. Remember of course that any high speed taxiway will not bring you to the beginning of the runway anyway, this has a negative effect on performance.Iz

Iz,I hadn't even considered asymmetrical thrust. I guess FS pampers us in this regard ;-) But what you say makes sense. I don't think I've ever had to wait for a 'late' engine to spool up in FS except at startup. Thanks for the follow up. There's something to learn in this forum with every post. I love it. Spend an hour in the Captain Sim forum and you'll see how good we have life here!Cheers,J