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Tire RPM's For Takeoff-landings  
User currently offline747LUVR From United States of America, joined Jul 2005, 394 posts, RR: 0
Posted (7 years 11 months 1 week 6 days 8 hours ago) and read 2976 times:

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

just for Shizz and Giggles.....

5 replies: All unread, jump to last
 
User currently offlineRoseFlyer From United States of America, joined Feb 2004, 9488 posts, RR: 52
Reply 1, posted (7 years 11 months 1 week 6 days 7 hours ago) and read 2963 times:

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.


If you have never designed an airplane part before, let the real designers do the work!
User currently offlineVC10 From United Kingdom, joined Nov 2001, 1406 posts, RR: 16
Reply 2, posted (7 years 11 months 1 week 6 days 7 hours ago) and read 2960 times:

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


User currently offline777236ER From , joined Dec 1969, posts, RR:
Reply 3, posted (7 years 11 months 1 week 6 days 5 hours ago) and read 2921 times:

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).

User currently offline747LUVR From United States of America, joined Jul 2005, 394 posts, RR: 0
Reply 4, posted (7 years 11 months 1 week 6 days 4 hours ago) and read 2902 times:

thanks ya'll....thanks.

User currently offlineStealthZ From Australia, joined Feb 2005, 5678 posts, RR: 45
Reply 5, posted (7 years 11 months 1 week 6 days ago) and read 2830 times:
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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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