Rocket Powered Cars
05-31-2006, 03:43 PM
#11
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I think what you are asking for is a speedometer. It will tell you how fast the car is going. if you put the car on a conveyor belt it wouldn't matter if it was running or not. The wheels would have no power to turn them. The only reason the wheels would turn is because the rocket would be pushing the car forward. Put the car on ice and put the brakes on and the car would likely still move.
Take a Hotwheels toy car for example. Whether you have a rocket or a hand pushing it along the floor... It wouldn't have and power to the wheels. the only reason the wheels turn is because it is being pushed along the ground and the friction turns the wheels.
I don't know how to explain it any other way.
Take a Hotwheels toy car for example. Whether you have a rocket or a hand pushing it along the floor... It wouldn't have and power to the wheels. the only reason the wheels turn is because it is being pushed along the ground and the friction turns the wheels.
I don't know how to explain it any other way.
05-31-2006, 04:08 PM
#12
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doesnt matter that the thing is on rollers, apart from the horizontal force they creat going against the rocket with how they are slightly v-shaped. the car will fly off.
05-31-2006, 04:13 PM
#13
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^^^
good example with a toy car
Dude, car will not turn wheels. Wheels will be only rolling if the car will go forward. If car will be tied, wheels will not be turned/rolled, cause car will not go forward.
good example with a toy car
Dude, car will not turn wheels. Wheels will be only rolling if the car will go forward. If car will be tied, wheels will not be turned/rolled, cause car will not go forward.
05-31-2006, 04:14 PM
#14
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A rocket car will propel itself forward, and the wheels will only turn if they are on the ground. There is no transaxel connecting to a rocket transmission, lol.
Basically, a rocket car would not turn the wheels, therefore on a dyno you will get 0whp.
Basically, a rocket car would not turn the wheels, therefore on a dyno you will get 0whp.
05-31-2006, 04:42 PM
#16
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^ and with that said, these (thrust and horsepower) are not directly related, so it is not simple to convert one to the other.
http://www.aerospaceweb.org/question...on/q0195.shtml
you'd have to take the horsepower of the car alone and the thrust from the jet engine alone and consider them 2 separate entities
http://www.aerospaceweb.org/question...on/q0195.shtml
you'd have to take the horsepower of the car alone and the thrust from the jet engine alone and consider them 2 separate entities
05-31-2006, 04:48 PM
#17
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Yep, Im not concerned about measuring anything though, I just wonder if the car would move forward along the belt, assuming the belt always matched the speed of the tires spinning...
Lets assume that the thrust is not strong enough to push a car forward with very strong brakes applied (so the wheels would simply not spin.. Basically, the thrust would have to overcome the friction of the rubber contacting the ground and weight of the car...), but it can still be quite strong, and would easily push a car on wheels on a regular surface to very high speeds.
Lets assume that the thrust is not strong enough to push a car forward with very strong brakes applied (so the wheels would simply not spin.. Basically, the thrust would have to overcome the friction of the rubber contacting the ground and weight of the car...), but it can still be quite strong, and would easily push a car on wheels on a regular surface to very high speeds.
05-31-2006, 05:38 PM
#18
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Easy solution buy a big ricer wing. Take it and turn it upside down then you wont have to wory about the friction once you have liftoff.
Ok if you have a rocket on a car with brakes full applied and it moves from a stop. Now since kinetic coefficient of friction is less than static you would have an out of control car with smoke from the tires then blowouts causing spinning.
Why are you asking this?
Ok if you have a rocket on a car with brakes full applied and it moves from a stop. Now since kinetic coefficient of friction is less than static you would have an out of control car with smoke from the tires then blowouts causing spinning.
Why are you asking this?
05-31-2006, 06:04 PM
#19
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<sigh> Ok, let me rephrase it then.. This is just to make it easier to visualize.
Situation A.. Slap a rocket or jet engine onto a car on an open track, no brakes applied.. So basically you just have rolling friction. Naturally, the rocket engine will overcome the rolling friction and the car will start to roll forward.
Situation B.. Slap the exact same rocket engine on a car which has wheel shaped objects connected to the car, but they are a static part of the frame of the car and therefore the wheels cannot spin. The rocket, in this case, we'll assume is not powerful enough to overcome the friction created by the weight of the car, the surface area of the 'wheels' touching the ground, and the types of materials contacting eachother (rubber on asphalt for example). Therefore the car does not move with the rocket/jet on at full power.
Situation C.. Put the exact same jet/rocket engine on a vehicle with free moving wheels, on a dyno or conveyor belt (or what have you), which is programmed to instantaneously counteract the rolling motion generated by the wheels of the vehicle as a result of forward thrust overcoming the rolling friction of the wheels on the conveyor belt.
Question: Will the vehicle move forward on the conveyor belt?
As for why I'm asking this question... Hmm... Dunno, guess I just like to ask annoying questions smile.gif
Situation A.. Slap a rocket or jet engine onto a car on an open track, no brakes applied.. So basically you just have rolling friction. Naturally, the rocket engine will overcome the rolling friction and the car will start to roll forward.
Situation B.. Slap the exact same rocket engine on a car which has wheel shaped objects connected to the car, but they are a static part of the frame of the car and therefore the wheels cannot spin. The rocket, in this case, we'll assume is not powerful enough to overcome the friction created by the weight of the car, the surface area of the 'wheels' touching the ground, and the types of materials contacting eachother (rubber on asphalt for example). Therefore the car does not move with the rocket/jet on at full power.
Situation C.. Put the exact same jet/rocket engine on a vehicle with free moving wheels, on a dyno or conveyor belt (or what have you), which is programmed to instantaneously counteract the rolling motion generated by the wheels of the vehicle as a result of forward thrust overcoming the rolling friction of the wheels on the conveyor belt.
Question: Will the vehicle move forward on the conveyor belt?
As for why I'm asking this question... Hmm... Dunno, guess I just like to ask annoying questions smile.gif
