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Dapol Presflo Wagon Kits - Kit Bashing - More Practical Help - Your Model Railway Club
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 Posted: Sat Oct 5th, 2019 09:30 pm
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Sol
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Kevin, rolling stock weight
https://www.nmra.org/sites/default/files/standards/sandrp/pdf/rp-20.1.pdf       or
http://amra.asn.au/wp-content/uploads/sites/7/2016/03/massstandard.pdf



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Ron
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 Posted: Sun Oct 6th, 2019 07:45 am
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Hi Petermac.  Thank you for your reply. I knew that I read it somewhere, I just hope that I get that far with so many fiddly bits. Best wishes Kevin 



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 Posted: Sun Oct 6th, 2019 12:50 pm
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Hi Kevin,

One ounce plus 0.5 ounces per inch length. Or 28g plus 14 g per 25.4mm. Metal wheelsets add a bit more. 


That's for HO 1:87, and S 1:64. So good for OO.


Nigel



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 Posted: Sun Oct 6th, 2019 01:37 pm
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Hi Ron.  Thank you for your reply. I will have to read that very carefully, with the Dapol RTR Wagons I filled all the space available. But now I have the answer I will comply with the standard. Best wishes Kevin 



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 Posted: Sun Oct 6th, 2019 01:43 pm
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Hi Nigel.  Thank you for your reply. Sounds good, but why more for metal wheelsets? With these wagons I think that the centre of gravity may be higher, not so good for Shunting. Best wishes Kevin 



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 Posted: Sun Oct 6th, 2019 02:51 pm
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I dunno why, but for some reason I've got 30 grams stuck in my head for OO gauge wagons.

Could be when I was playing around with my shunting puzzle plank and trying out Kadees.


Ed



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 Posted: Sun Oct 6th, 2019 05:18 pm
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Hi Ed. Thank you for your reply. My modus operandi for Dapol RTR Wagons was to unscrew the bodywork and fit the Kadees then carve up some styrene and frame the liquid lead before gluing it in position. And of course reassembly.Best wishes Kevin 



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 Posted: Mon Oct 7th, 2019 03:42 am
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BCDR
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Hi Kevin,

If you compare plastic wheels with metal ones the metal ones mass more. one of the reasons they run better.The NMRA guidelines are in my opinion a bit light. 


Nigel



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 Posted: Mon Oct 7th, 2019 06:08 am
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Hi Nigel. Thank you for your reply. Fortunately the wheels are metal, but, if they weren’t I would have changed them.Regarding mass , I would have thought that meant say comparing tractor tyres with lorry tyres. I try to follow expert advice, provided that it is given by experts? Best wishes Kevin 



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 Posted: Mon Oct 7th, 2019 05:39 pm
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Hi Kevin,

Mass is just the amount of matter a body has. Two wheels, one of plastic (mostly carbon) one of metal (usually a metal alloy) of the same dimensions will not weigh the same. Carbon (atom)  has a lower mass than copper or iron (atom). That is why lead or more commonly now steel is used as weights. You would need almost 20 times more plastic than lead if you went by volume. Probably more as there is a lot of empty space in plastic polymers. Should probably be comparing pure graphite rather than plastic.


Nigel



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 Posted: Thu Oct 10th, 2019 08:16 am
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Hi Nigel. Thank you for your reply. I can see the error of my ways /interpretation. Best wishes Kevin 



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