Registered: 23/03/01
Posts: 1906
Loc: San Jose, CA
Quote:
Originally posted by BlueSky:
Quote:
Originally posted by XPLORx4: [b]Great. On a windless day, if the engines are off the aircraft has neither airspeed nor groundspeed.
OK, now, let's place a conveyor belt under the aircraft's wheels, and bolt the plane to the ground by its nose, tail,and wingtips. Now, let's fire up the conveyor belt to 100mph.
It's still a windless day. Answer these questions: 1) What's the aircraft airspeed? 2) What's the aircraft groundspeed? 3) What's the aircraft's wheelspeed on the conveyor?
1) Zero 2) Zero 3) I'm not sure what you mean. All over this thread, people have said "the wheels are turning at X MPH." But speed is a measure of movement, and the wheels aren't moving (except for rotation), so it should really be measured in RPM, right? Can you clarify please?[/b]
The conveyor belt has a surface speed of 100mph, right? The RPM of the tires over the conveyor belt is determined by the size of the tire, but we don't care about the tire RPM, we care about the speed at which the tread of the tire is moving, which is... 100mph! Right?
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