Author Topic: Easy Aviation question...that I cannot answer!!! (Read 2120 times)

TheManx · « **Reply #15 on:** November 17, 2003, 02:09:40 PM »

Just goes to confirm my belief that the world is indeed....flat.

AKWeav · « **Reply #16 on:** November 17, 2003, 02:32:29 PM »

Thought a gyro was a pocket like sandwich.

rabbidrabbit · « **Reply #17 on:** November 17, 2003, 02:33:50 PM »

Just think of us as crabs on the bottom of the sea... wanting to be fish

Octavius · « **Reply #18 on:** November 17, 2003, 02:50:12 PM »

Quote

Originally posted by MRPLUTO
This is called the Coriolis effect. It explains why hurricanes, for example, have the rotation they do.
MRPLUTO

... and why toilets in Australia flush counter-clockwise

AKIron · « **Reply #19 on:** November 17, 2003, 02:53:46 PM »

There is no plane.

ravells · « **Reply #20 on:** November 17, 2003, 02:55:18 PM »

lolololol! AK Iron!

Inspired.

Ravs

Otto · « **Reply #21 on:** November 17, 2003, 03:57:39 PM »

The atmosphere the plane is flying in is moving at the same speed as the earth's rotation.

It's the same reason you don't fly 300 feet down the the block everytime you jump in the air.

Vulcan · « **Reply #22 on:** November 17, 2003, 04:10:28 PM »

The atmosphere rotating at the same speed of the earth has very little to do with it.

Example: If there were no atmosphere and you jumped you would still fall in the same spot.

Its all about relativity. The plane, even at standstill is travelling at the earths rotational speed (1000mph). When the plane takes off there are two primary forces acting on the plane (in relation to this question), inertia, and gravity. Inertia keeps the plane at speed relative to the earths spinning speed. In regards to the question the atmosphere only really provides relative drag (outside of the whole aerodynamics side), ie if the atmosphere were not rotating relative to the earths spin speed upon liftoff the plane would either have a 1000mph tailwind or headwind.

So the answer is inertia, gravity, and very little to do with atmosphere.

Otto · « **Reply #23 on:** November 17, 2003, 04:20:05 PM »

Example: If there were no atmosphere and you jumped you would still fall in the same spot.

I 'Stand corrected' (get it? STAND CORRECTED??) I'm so funny...

Vulcan · « **Reply #24 on:** November 17, 2003, 04:28:23 PM »

Its ok Otto, I just had two cans of Red Bull and a bottle of V (a little wired right now).

vorticon · « **Reply #25 on:** November 17, 2003, 05:56:05 PM »

actually you land in the same spot you jumped from because you still have the speed that the earth is rotating with you...wich is the same reasoln why if you jump on a bus going down the highway you dont end up going through the bathroom wall...

AKIron · « **Reply #26 on:** November 17, 2003, 05:58:56 PM »

Quote

Originally posted by vorticon
actually you land in the same spot you jumped from because you still have the speed that the earth is rotating with you...wich is the same reasoln why if you jump on a bus going down the highway you dont end up going through the bathroom wall...

What happens if your bus is doing the speed of light and you jump up?

Vulcan · « **Reply #27 on:** November 17, 2003, 06:04:54 PM »

Quote

Originally posted by vorticon
actually you land in the same spot you jumped from because you still have the speed that the earth is rotating with you...wich is the same reasoln why if you jump on a bus going down the highway you dont end up going through the bathroom wall...

Umm... thats what I said.

cpxxx · « **Reply #28 on:** November 17, 2003, 08:41:58 PM »

It's also means that if you as a passenger in that plane jumped in the air you wouldn't get slammed into the rear bulkhead at 1500 mph. Messy that!

But if you jump OFF the bus at 60mph you would continue to travel forward alongside the bus at 60 mph because relative to the bus you are not moving. Of course on Earth this lasts .3 of a second then gravity and drag ruins your whole day. In space this wouldn't happen. But the number 19A bus doesn't travel to the moon and back (it just feels like it!)

Fascinating things gyros. A spinning gyro will attempt to maintain it's position in SPACE not the Earth. So the gyros in the aircraft will attempt to tilt or topple back towards it's original position in space at a known rate. Precession. This of course makes them useful for navigation. I always found that fact to be quite weird. I mean how do gyros know??????

Plus if you apply a force to a spinning gyro it will react at 90 degrees to the applied force, again useful for attitude indicators in aircraft. You can prove this by spinning a wheel in your hands. If you try turn the wheel left or right it will resist with a force 90 degrees to the force applied by you.

Motorcyclists use this fact whether they know it or not. When travelling in a straight line at speed if the rider pulls on the left handlebar or pushes on the right handlebar the bike will tilt to the right and of course turns right. It's amazing how many experienced motorcyclists don't know this, countersteering it's called. But it's a function of gyroscopes which the front wheel is one.

Another interesting idea. If the earth is rotating at 500 mph at the latitude you are flying at and the aircraft is flying west at 500 mph. The sun never sets. Perpetual daylight.

Of course the Earth itself is a gyroscope and it tilts or precesses over time.

AKS\/\/ulfe · « **Reply #29 on:** November 17, 2003, 08:56:13 PM »

Quote

Originally posted by cpxxx
Another interesting idea. If the earth is rotating at 500 mph at the latitude you are flying at and the aircraft is flying west at 500 mph. The sun never sets. Perpetual daylight.

If you manage to stay up for an entire year, it will eventually set at some mid point and then be in darkness for half a year. Then sunrise, sunset, and twilight would be around for a lot longer too.
-SW