747luvr
Posts: 331
Joined: Thu Jul 21, 2005 1:39 am

Tire RPM's For Takeoff-landings

Wed Aug 16, 2006 2:21 am

I know there must be some scientific mathmetical computation to figure out what the RPM for a tire on any jet for take off or landings.-estimated figures. Anyone got the calculations. My guess-speed, tire dimensions and feet traveled?? thanks....
Joe

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roseflyer
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RE: Tire RPM's For Takeoff-landings

Wed Aug 16, 2006 3:17 am

A good estimate is between 1000 and 1500 rpm. That is actually noticeably slower than a car's tire. A typical tire diameter is 40 inches, and a jet takes off in the vicinity of 150 mph.
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vc10
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RE: Tire RPM's For Takeoff-landings

Wed Aug 16, 2006 3:29 am

Well here goes:-

Asssuming take-off speed-----200 MPH

Assuming tyre dia------------3.5 feet

Then a] 1 mile = 5280 ft

b] Distance covered in 1 hour is [a] x 200 = 1056000 ft

c] Distance covered in 1 minute is [b]div by 60=17600 ft

d]Circumference of wheel is Pye x Dia = 11ft

e] Rpm thus is [c] divided by [d] =1600 RPM

Long time since I had to use the grey cell so hope that is correct but I am sure others will be here soon. Perhaps I overcooked the take off speed a bit, but it made the figures easier

littlevc10
 
777236ER
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RE: Tire RPM's For Takeoff-landings

Wed Aug 16, 2006 4:41 am

Or, another way to that above, the angular speed is the the linear velocity over the tyre radius. To get the angular speed (rad/s) into RPM, multiply by 60/(2*pi).
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747luvr
Posts: 331
Joined: Thu Jul 21, 2005 1:39 am

RE: Tire RPM's For Takeoff-landings

Wed Aug 16, 2006 5:48 am

thanks ya'll....thanks.
 
Stealthz
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RE: Tire RPM's For Takeoff-landings

Wed Aug 16, 2006 10:28 am

A 50" diameter B777 main gear tyre would be doing 1008.5 RPM at 150MPH

At that same 150MPH the rear tyres on my Twin Turbo 300ZX would be doing 2020 RPM
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