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NEED BEER HEAD HURT. Beer was always one of my best design aids in college. We had a fridge in the concrete lab that was supposed to be for samples etc. We kept it full of beer. Our profs would come down and have a few with us. it was always a good time.

Ed, It won't rise into the air. It will take off normally. There is no force to counteract the thrust. Therfore the plane accelerates.

"In the subject problem you don't allow the plane to got forward. " Thats it! The plane does go forward. There is nothing holding it back!

I don't know what the right way is. I just regisered with Texas as CivengPE, P.E. It was $25.00 to register myself as a firm. I head that Corps have to file quarterly reports etc. Man, we need to enlist the help of a buisness major. I'm going to McDonalds for lunch today, maybe I'll run...

Check it out. http://community.discovery.com/eve/forums/...76/m/5471975538

Ok. This is my last attempt to convince the NON-BELIEVERS! :prayers: :brick: Assume that the wheel hubs are frictionless just for argument sake. When you turn on the conveyor, the plane, with the engine off, does not move. now provide thrust from the engine. Viola! The damn thing...

DVINNY, I went to mythbusters site and they have a 9 page forum discussion on the exact same topic. It looks like this debate has made the rounds before.

I was extremely nervous when I accepted it. I had tons of doubts running through my mind. But, when I got into the meat and potatoes of the design it was invigorating. Everything seemed to come together. It truly was my first REAL engineering experience. I didn't have my boss or coworkers...

Why are you incorporating? doesn't that require quarterly reports ect...ect.. Why not just go Sole Prop.?

I still don't have mine either. In Texas, we don't have to have the wall certificate to practice.

Very well put Sap. Class Dismissed! :claps:

MaPE, You almosty there. The runner is pushing off of a moving surface, the conveyor,. The airplane is not. It is pushing aginst the air. it wouldn't matter, except for friction in the wheels, if the conveyor was traveing a million miles per hour.

DVINNY, I only think the other ones are stupid, because I can never get them without google. Thank God for Google. With the engineering (physics) ones, I feel I at least have a fighting chance without having to cheat.

??FX = F(thrust) - F(Friction) - F(Drag) If F(thrust) is substantially larger than both F(Friction) and F(Drag) Then the net force is positive. Therefore the plane accelerates. The only way for the plane not to move would be the following: F(thrust) = F(Friction) +F(Drag) The only...

Ed, see above.

would everyone agree that if the plane was tethered by a rope and the conveyor turned on, at say 100 mph, that the tension on the rope would only be cause by the friction of the wheel hub? replace that tether with a small amount of thrust from the engine. now, add full power, you have a net...

Ma, It's not the localized wind caused by the engines that is causing the lift. The plane will actually move! the thrust is imparted on the air not the ground. it accelerates exactly the same way it would off of the conveyor. if you had two planes side by side with one on a conveyor and the...

Miz, It would fly because it is moving. if you were standing to the side of the conveyor the plane would accelerate and takeoff normally. the wheels would just be spinning twice as fast. once again, the engine imparts it's energy on the air not the ground. if it did planes couldn't fly anytime.

Just finished my first side job this past weekend. It paid for my review course. It was supposed to be a simple left turn lane design, but turned into a road widening / turn lane design project. Man that felt good! :???:

I mised that one in college. We had a prof that would always put one bonus question on the tests. He used to have some good ones!