Aces High Bulletin Board
General Forums => Aces High General Discussion => Topic started by: Citabria on November 10, 2003, 10:49:02 AM
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or if the pilot hits the brakes in fligth with gear down :)
they shouldnt roll when flying and not in contact with the runway
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cc, i tried stopping the wheels with brakes too. Would the tires spin anyway though without brake pressure because of the airflow going over them?
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Nope they wouldn't and I dare any of you lesser beings to challenge me!! Sorry, temporary megalomaniac complex... :rolleyes:
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tadpole
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Originally posted by Furball
cc, i tried stopping the wheels with brakes too. Would the tires spin anyway though without brake pressure because of the airflow going over them?
In a word, no. You're right, in that the air flowing over the wheels would cause them to rotate. The problem is, the air flowing under the wheels cause them to rotate equally in the opposite direction. When the plane takes off, the wheels will continue spinning for a bit --they won't just immediately lock when they lose contact with the ground-- but eventually friction will cause them to stop.
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It is checklist procedure on many aircraft types to tap the brakes before retracting the gear to avoid problems (?) with spinning wheels in the wheelwell.
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Actually there is a wooden block in most planes which act as a "snubber" to stop wheel rotation. It is still used today in the nose gear for most modern jets. The next time you fly somewhere, listen for the thump of the nose gear hitting the snubber on "gear up". It is very noticable.
Ren :)
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Guess I'm gonna dip into my old Fighter days.
When an aircraft becomes airborne, the wheels are spinning at a considerable rate. Allowing them to continue spinning as they enter the wheel well can have some pretty catastrophic results.
Many aircraft use an anti spin system to stop the wheels from spinning before entering the well. Basically what happens is once gear is selected "up" AND the squat switch is released (or activated depending on the system), hydraulic pressure is applied to the brake system automatically to stop the wheels from spinning, prior to them entering the wheel well. Once "up and locked" the pressure is removed.
Conversly when landing, if the pilot is applying pressure to the brakes before touchdown, damage and/or very premature wear to the tire can result. (due to the fact that the wheel is unable to spin at touchdown). In order to prevent this, many aircraft have an "anti-skid" type system which won't allow hydraulic pressure to act on the brake system until the wheel hits a set rotational speed. (basically allowing the wheel to come up to speed once on the ground, so great chunks of tire aren't ripped off at touch down).
Now, there are other methods used ( REN pointed one out) as well, but these systems I have described are fairly common for larger and/or higher performance aircraft.
Cheers,
RTR
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friction:aok
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Fester i love reading your posts, they make me laugh:lol
The 109's winsheald is 2cm to small what are you thinking Hitech?????
The wheels still roll when you get off the ground!!!!
The 109's air speed indecator is half a millimeter off, yah need to fix that Hitech!!!!!
The most minute details is wrong and Fester is all over them
:lol i have to say though it is admerable:aok
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i notice things that no one else does.
its called attention to detail.
HTC is made aware of small details it does not mean they act on them, though sometimes they do.
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well lets hope they act on em.....
Fester :aok
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Oh, Nod
U get ignored alot?
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Not really.......
U trying to be an A**?
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Funny u should ask that...