Re: Scale Weights

Paul Hillman

So basically all model cars should weigh about the same according to length? That's why a 40 ft flatcar would weigh the same as a 40 ft boxcar? Maybe THAT's the reason that one wood, kit-built boxcar I had kept derailing regardless of changing trucks and fine-tuning all surfaces. I wasn't too closely concerned about car weights at that time.

I would still assume though that the scaling of weight per prototype weight is not wrong, just impractical.

Paul Hillman

----- Original Message -----
From: timboconnor@...<mailto:timboconnor@...>
To: STMFC@...<mailto:STMFC@...>
Sent: Thursday, August 18, 2005 11:55 AM
Subject: [STMFC] Re: Scale Weights

Paul, model trains do not perform like real trains.
For one example, the weight of the car on the rail
is distributed over an area larger by a factor of 87.1.
(The surface area of contact between the wheel and
rail only changes in 2 dimensions as you scale down.)
Also, our curvature is usually about 10 times as sharp
as you'd find on a prototype. If you put 1 oz cars with
5 oz cars in a train and run it up a 3% grade with 40
degree curves, then don't be surprised when you get
"stringlining" of cars in the middle of the train.

There must be a FAQ out there somewhere... try the
LDSIG mailing list.

Tim O'Connor

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