Quote:
Originally posted by XPLORx4:
Quote:
Originally posted by BlueSky:
[b]How are you calculating that?
Look, you should know that tire size and forward speed are irrelevant to each other. An Xterra with 35" tires and an Xterra with 31" tires can both keep up with each other, right? They both can use GPS to travel at 60mph, right? But their speedometers are different because their tires are rotating at different RPM. Cars use rotational sensors, multiplied by the differential gear ratios, multiplied by the stock OEM tire diameter to provide accurate speed.

So, in our plane's tires, if the tires are really big or really small, their tread is still moving at the surface speed of the conveyor belt, right? So, if the conveyor belt is going 100mph, and the plane is bolted to the ground on a windless day:

1) What's the airspeed? 0 mph
2) What's the groundspeed? 0 mph
3) What's the tire tread speed? 100 mph

Do you agree?[/b]
Yes, I know all that. So answer my question.