Joined

·
2,154 Posts

1 - 5 of 5 Posts

Joined

·
2,154 Posts

Joined

·
1,780 Posts

I just times my slot car speed by 32.

For example if my 1/32 scale slot car can lap a track 60 ft long in 5 sec, this equates to my slot car lapping at an average speed of

60ft x 32 = 1920ft = 0.36 miles

1 divide by 0.36 = 2.75

2.75 x 5 seconds = 13.75 seconds per mile

1 hour = 3600 seconds divde by 13.75 =

I think that's right but don't know if that answers the question

PS for scale realism fifties/sixties cars averaging say 100mph should be going round a 60ft track at an average 3.125mph.

Marlon.

Joined

·
1,342 Posts

When you get into Froude numbers and such, something different is happening. There are ratios that are used in scale prototyping such that the actual EFFECT on the scale car is the same. So if you are using a wind tunnel to test a miniature flight surface, and you want the model to actually behave like the real 1:1, then what you do is pick the appropriate Standard Number and keep it constant for both the 1:1 and scale model. The Froude Number is a standard number which relates to Gravity and Inertia (it is actually Velocity**2/Length * gravitational constant). But in keeping this constant you are only modeling the Gravity and Inertial effects. If aerodynamic response is what you want to model then you might keep the Mach number constant for kinematic similarity and the Reynolds number for dynamic similarity and pressure loss.

One of the obvious problems with this approach, it that whereas it is a useful predictor of behavior it is impossible in most cases to model for all the various effects. You pretty much have to pick what you want to emulate and build a model that conforms to those criteria.

I hope this helps. I know this question comes up every once in a while. Since you mentioned the Froude number I thought I'd try to clarify it. If you have real interest in this stuff, look up Standard Numbers in a general engineering text like Mark's Standard Handbook.

cheers,

John

Or did I miss something here?

Does it mean my little 1/32 drivers are experiencing life at 32 times the speed I am? Some of them should have had their telegrams from the queen a long time ago in that case.

1 - 5 of 5 Posts

Join the discussion

SlotForum

A forum community dedicated to slot car owners and enthusiasts. Come join the discussion about collections, racing, displays, models, track layouts, styles, reviews, accessories, classifieds, and more!

Full Forum Listing
Explore Our Forums

Recommended Communities

Join now to ask and comment!