![]() |
If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#6
|
|||
|
|||
![]()
It's the takeoff weight, wing airfoil and incidence, lift devices and
ability to rotate to a given angle (tail clearance) that determine liftoff speed (not taking into account air density, determined by ambient conditions). From these factors the tire limit speed is determined and tires manufactured to support that airplane. Note that three airplanes, at least, are limited to a higher liftoff speed than they could actually use because of tail drag - F102, F106 and F15. All three can fly at a much higher angle of attack than te design limits. I suspect the 757/767 are in the same boat. BTW I think the touchdown speed on the Shuttle is higher than 200 mph. That's only about 173 Kts, less than some fighters. Tires are built for much higher speeds - and you can buy them for your car. A waste of money unless you have the right car, though. As I remember the tire limit speed on the DC10-30 was 217 knots. A no-slat no-flap touchdown was right on that limit, too. Our F104As with three external tanks and the dart tow rig rotated at 205 Kts and about 5000 feet of roll. That was the heaviest we flew at. The F4E carrying dispensers for the CBU38 (? antitank munitions) on the inboard pylons rotated at 196 but that was a CG problem. FWIW we got one batch of F104 tires that were built and designed to someone's erroneous specifications (built to a newly specified design) and we were throwing treads off brand new tires on a light-loaded zipper - only gun ammo and 2xAIM9s aboard. That was interesting . . . Shortly thereafter the specs were changed to a performance criterion and the problems disappeared. Walt BJ |
Thread Tools | |
Display Modes | |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
Homebuilt Aircraft Frequently Asked Questions List (FAQ) | Ron Wanttaja | Home Built | 40 | October 3rd 08 03:13 PM |
Homebuilt Aircraft Frequently Asked Questions (FAQ) | Ron Wanttaja | Home Built | 0 | October 1st 04 02:31 PM |
Homebuilt Aircraft Frequently Asked Questions List (FAQ) | Ron Wanttaja | Home Built | 0 | September 2nd 04 05:15 AM |
Homebuilt Aircraft Frequently Asked Questions (FAQ) | Ron Wanttaja | Home Built | 0 | May 1st 04 07:29 PM |
Homebuilt Aircraft Frequently Asked Questions (FAQ) | Ron Wanttaja | Home Built | 1 | January 2nd 04 09:02 PM |