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Old 11-10-2004, 02:49 PM   #16
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Quote:
Originally posted by chr15tophe
you cant scale the speeds up, eg if a model car does 20mph that doesnt mean it will do 200mph if scaled up. 20 mph is 20mph
I agree, If me and my dog get drunk and run around the yard at 10mph and we both run straight into a wall it doesnt mean he hit it at 50 just because he is 5 times as small.

I dont really know what Im talking about I just thought that would be funny.
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Old 11-10-2004, 02:52 PM   #17
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u get ur dog drunk aint there a law against that
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Old 11-10-2004, 04:51 PM   #18
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One thing that is not to scale is air particles. So for a RC car the air has now become 10 times as big as a 1 to 1 car. so for a RC car it's like driving through golf balls for example. Thats why aero devices don't work like they do in RC, i.e. it's air is not as fine as it is with 1 to 1.

also RC wings are not very good in Aero. They work on a wind stall system which makes them work. Not very efficent but they work. If somebody made a proper aerofoil it would have different shapes on the top to the bottom. You just have to look at a plane wing upside down, that's what our wings should like like.

10 mph is 10 mph always.

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Old 11-10-2004, 05:16 PM   #19
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Aero devices do work like they do in real cars. They just don't have as much of an impact.
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Old 11-10-2004, 05:21 PM   #20
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He's saying that the priciple of the aero device isn't the same as a full size car. Yes, we use a wing with side damns, but to achieve the complexity of a full size wing would be very time consuming to achieve in 10th scale form. We basically just angle a piece of plastic and have the it change the direction of air to produce down force. Not very efficient aerodynamically but probably more efficient than carrying the weight around of a proper airfoil.
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Old 11-10-2004, 05:33 PM   #21
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Quote:
Originally posted by chr15tophe
you cant scale the speeds up, eg if a model car does 20mph that doesnt mean it will do 200mph if scaled up. 20 mph is 20mph
Actually it does.
However, the weight to power ratio would have to be the same.
Which is impossible to do because everything scaled up would be
heavier and you would lose ratio between the two.
However, if it could hypothetically be done, then yes, that car would go 200mph.
That would mean that the car could weigh no more than 35 pounds.
(3.5 pounds being the average for RC cars)
The engine would also have to produce the same RPMs.
Then the question of getting batteries to produce, ratio wise, the same power.
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Old 11-10-2004, 05:51 PM   #22
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I believe you are incorrect. If you scaled up the power and weight ratio of a 20 mph car x10, you wouldnt get a 200mph car, you would get a bigger 20mph car.
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Old 11-10-2004, 05:57 PM   #23
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I have just got into the RC side and i can see how it would help with traction. I had a race on monday night on our local indoor skate ring, it being very slippy to start with it would hepled if i put the wing on lol

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Old 11-10-2004, 06:31 PM   #24
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Quote:
Originally posted by Jack Smash
I believe you are incorrect. If you scaled up the power and weight ratio of a 20 mph car x10, you wouldnt get a 200mph car, you would get a bigger 20mph car.
Everything would have to be multiplied by ten. Including the
power distributed by the cells, the RPM's of the electric engine,
the cell capacity. As well as the car only weighing 35lbs! (the cells alone to do it would weigh in excess of hundreds of lbs)
I'm saying its impossible to really do, but if you could, then it would work.
Solving the issue of a light enough body (without going over 35lbs) and still holding its shape is another issue.
Again, its impossible! But if you could "what if" a lot of scenarios, then its possible.
Haven't you forgotten the most important rule:
"This suckers electrical, but I need the plutonium to produce
the 1.21 Gigawatts of electricity that I need!"
Its all make believe man! haha
(for those too young to remember, its a line from Back to the Future)

Last edited by scoobydo; 11-10-2004 at 06:43 PM.
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Old 11-10-2004, 10:18 PM   #25
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Quote:
Originally posted by PaZ
u get ur dog drunk aint there a law against that
LOL....that actually made me laugh
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Old 11-11-2004, 07:10 AM   #26
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Hahaha.... I need a new flux capacitor....

Speaking of that.... I worked in a REAL auto parts store as a teen.... We used to call up the strore that was across the street from us, an Aid auto... I constantly had the people there trying to find a flux capacitor for my 81 Delorean....
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Old 11-11-2004, 10:41 AM   #27
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Quote:
Originally posted by vtl1180ny
Hahaha.... I need a new flux capacitor....

Speaking of that.... I worked in a REAL auto parts store as a teen.... We used to call up the strore that was across the street from us, an Aid auto... I constantly had the people there trying to find a flux capacitor for my 81 Delorean....
LOL
did they actually look for it!?
That should be recorded somewhere for prosperities sake!
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Old 11-11-2004, 12:32 PM   #28
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You can still keep them busy if you asked for a water pump for a 2000+ Beetle.

They have a water pump but, the guy will think you're being funny and say their air cooled.

Like asking a Private to go fetch a left handed ratchet or a box of OD Green Grid squares from the Maintenance Chief.

Clear Grid Squares get lost easily 8-).
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Old 11-11-2004, 12:39 PM   #29
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Quote:
Originally posted by Jack Smash
He's saying that the priciple of the aero device isn't the same as a full size car. Yes, we use a wing with side damns, but to achieve the complexity of a full size wing would be very time consuming to achieve in 10th scale form. We basically just angle a piece of plastic and have the it change the direction of air to produce down force. Not very efficient aerodynamically but probably more efficient than carrying the weight around of a proper airfoil.
Have you read the link earlier in this thread. Our RC cars have wings that act identical to full scale race cars.
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Old 11-11-2004, 01:25 PM   #30
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Yes, our wings work just like the spoiler you see on the back of a Full Size Stock Car, they do not work like you see on a full size touring car. A properly designed wing is much more efficient than what we run, which is basically a spoiler designed to resemble a wing.
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