Re: Tony Thompson & Scale Weights
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Marcelo Lordeiro <mrcustom@...>
Don't forget that you will have to think on the locomotive drawbar pulling power also.
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Precision scale and Intermountain makes wheel sets with ball bearings and don't forget to replace the coil springs on the steam locomotives bearings . The correct springs allows you to raise one driving wheel without lifting the locomotive. Doing that you garantee that all drivers have the same adesion tp the track and you will pull twice as much cars. Marcelo Lordeiro ----- Original Message -----
From: Paul Hillman To: STMFC@... Sent: Thursday, August 18, 2005 1:47 PM Subject: Re: [STMFC] Tony Thompson & Scale Weights Tony, HUM!!!??? That just brought up another interesting thought to me. Wouldn't it be more true to scale-weight then, to know the prototype-car's empty weight, divide that by the cube of 87.1, (or some other scale ratio) and weight the car accordingly, rather than per the NMRA tables, eventhough they're a pretty good, "ball-park" figure? Paul Hillman ----- Original Message ----- From: Anthony Thompson<mailto:thompson@...> To: STMFC@...<mailto:STMFC@...> Sent: Thursday, August 18, 2005 10:57 AM Subject: Re: [STMFC] Tony Thompson & Scale Weights Paul Hillman wrote: > Say, in HO scale, 87.1:1, we physically scale-down the prototype > dimensions by that ratio. What if the car were built of the exact same > materials as the prototype, would the weight scale-down by 87.1 also? No, it would scale by the volume, which goes as the cube root of the scale. That would make it roughly 1.5 to 2 ounces. Tony Thompson Editor, Signature Press, Berkeley, CA 2906 Forest Ave., Berkeley, CA 94705 www.signaturepress.com<http://www.signaturepress.com/> (510) 540-6538; fax, (510) 540-1937; e-mail, thompson@...<mailto:thompson@...> Publishers of books on railroad history Yahoo! Groups Links ------------------------------------------------------------------------------ YAHOO! GROUPS LINKS a.. Visit your group "STMFC" on the web. b.. To unsubscribe from this group, send an email to: STMFC-unsubscribe@... c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. ------------------------------------------------------------------------------ |
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