22 Feb 08
Consider a small airplane during take-off on a concrete runway. Just at take-off, it is traveling at 100 mph. That is the speed required to obtain sufficient lift for it to leave the ground.
Now, imagine this same plane is not on a concrete runway. Instead it is on a giant long treatmill. The surface of the treadmill is traveling at 100 mph in the opposite direction from the direction in which the plane is pointing. The plane's throttle is wide open just as it was on the concrete runway.
What will you observe in this case? Will the plane be able to take off? Why or why not.
22 Feb 08
Originally posted by ddebenedThe plane will take off..... This has come up many many times already..... Planes derive their forward motion by pulling themselves through the Air, not down force on the wheels..... Thus the plane moves forward, thus there's air flow around the wings and the plane takes off.... and the wheels spin twice as fast......
Consider a small airplane during take-off on a concrete runway. Just at take-off, it is traveling at 100 mph. That is the speed required to obtain sufficient lift for it to leave the ground.
Now, imagine this same plane is not on a concrete runway. Instead it is on a giant long treatmill. The surface of the treadmill is traveling at 100 mph in the opposi ...[text shortened]... way.
What will you observe in this case? Will the plane be able to take off? Why or why not.
Mythbusters actually proved this with a small ultralight aircraft.....
23 Feb 08
Originally posted by ddebenedSorry if I came across as harsh also. Its just that this has been argued to death and I have a friend who still thinks it will only apply to smaller aircraft. That the down force on the wheels of say a 747 would be sufficient to prevent take off speeds.... I can't provide definite proof.... can any of you actually??
I apologize for being repetitive. I have just now returned after a considerable absence from RHP and have not been following this forum.
Your statements are correct.
23 Feb 08
Originally posted by Mexicothe thrust of the engines of a 747 can easily overcome the friction from the down force. As you said, the wheels will just spin faster.
Sorry if I came across as harsh also. Its just that this has been argued to death and I have a friend who still thinks it will only apply to smaller aircraft. That the down force on the wheels of say a 747 would be sufficient to prevent take off speeds.... I can't provide definite proof.... can any of you actually??
23 Feb 08
Originally posted by uzlessThats what I said, he just won't believe me.... I think I gonna need to get the exact specifications of a 747 and do the math just to prove the point....
the thrust of the engines of a 747 can easily overcome the friction from the down force. As you said, the wheels will just spin faster.
23 Feb 08
Originally posted by Mexicodon't waste your time.....if he understands why a small plane can overcome the downforce but can't understand why a big plane can overcome the downforce, BECAUSE IT"S FRICKIN ENGINES ARE BIGGER, then your friend doesn't understand why a small plane can take off in the first place.
Thats what I said, he just won't believe me.... I think I gonna need to get the exact specifications of a 747 and do the math just to prove the point....
you'll just be banging your head for no reason.
24 Feb 08
Originally posted by uzlessI spend my life banging my head off the wall with this guy..... See I studied physics, and geology as well as bits of other sciences..... He did philosophy, English lit and politics..... But still has an opinion on everything....
don't waste your time.....if he understands why a small plane can overcome the downforce but can't understand why a big plane can overcome the downforce, BECAUSE IT"S FRICKIN ENGINES ARE BIGGER, then your friend doesn't understand why a small plane can take off in the first place.
you'll just be banging your head for no reason.
24 Feb 08
Originally posted by MexicoTell him his opinion counts for $h1t against fact. Done.
I spend my life banging my head off the wall with this guy..... See I studied physics, and geology as well as bits of other sciences..... He did philosophy, English lit and politics..... But still has an opinion on everything....
24 Feb 08
Originally posted by Mexicotell him that he is philosphically correct. the 747 can't take off because of all the angels sitting on the wings
I spend my life banging my head off the wall with this guy..... See I studied physics, and geology as well as bits of other sciences..... He did philosophy, English lit and politics..... But still has an opinion on everything....
24 Feb 08
Originally posted by mtthwSorry, i did know this, the point was its not peer to peer in the same way as other systems that are in common use..... Its very different.... If someone is asking about a new peer to peer system then chance are they're not using bittorrent anyway....
Err...BitTorrent is peer-to-peer.
You did manage to make me look slightly stupid.... Well done 😛