Scale speeds?

I was reading a book last night about french railways and it stated that the lesser radii of tramway/departmental trains could be applied if the train's speed was kept under 25 mph.

I have neither the knowledge nor the inclination to work it out but is a scale speed of 25 mph in a g scale loco possible without burning out a motor and what about live steam?

Mikey

Couldn't resist the challenge guys Does it make sense ? And don't dare ask fer metric equivalents.





[tr][tr][][tr][/td]

Full size mph			Speed in feet per sec by scale
	20	22	25	29	32	43
1	0.07	0.07	0.06	0.05	0.05	0.03
2	0.15	0.13	0.12	0.1	0.09	0.07
3	0.22	0.2	0.18	0.15	0.14	0.1
4	0.29	0.27	0.24	0.2	0.18	0.14
5	0.37	0.33	0.29	0.25	0.23	0.17
10	0.74	0.67	0.59	0.51	0.46	0.34
15	1.1	1	0.88	0.76	0.69	0.51
20	1.47	1.34	1.18	1.01	0.92	0.68
25	1.84	1.67	1.47	1.27	1.15	0.85
30	2.21	2	1.76	1.52	1.38	1.03
	1 mile = 1760 yds = 5280 ft		1 mph = 5280 ft/h = 1.47 ft/sec		5280(FT) / 3600(SEC) = 1.47 FT / SEC

mikeyh wrote:

I was reading a book last night about french railways and it stated that the lesser radii of tramway/departmental trains could be applied if the train's speed was kept under 25 mph.

I have neither the knowledge nor the inclination to work it out but is a scale speed of 25 mph in a g scale loco possible without burning out a motor and what about live steam?

Mikey

So Mikey I reckon that your 25mph comes out at AROUND 18 - 22 inches per second.

thanks Patrick. i tried to work it out three times and got a different answer each time!!

mikey

You didn't ask !!

Full size kmh			Speed in cms per sec by scale
	20	22	25	29	32	43
1	1.39	1.26	1.11	0.96	0.87	0.65
2	2.78	2.53	2.22	1.92	1.74	1.29
3	4.17	3.79	3.33	2.87	2.6	1.94
4	5.56	5.05	4.44	3.83	3.47	2.58
5	6.95	6.31	5.56	4.79	4.34	3.23
10	13.89	12.63	11.11	9.58	8.68	6.46
15	20.84	18.94	16.67	14.37	13.02	9.69
20	27.78	25.25	22.22	19.16	17.36	12.92
25	34.73	31.57	27.78	23.95	21.7	16.15
30	41.67	37.88	33.34	28.74	26.04	19.38
1 kph = 1000 metres per 3600 seconds
cms per sec	27.78

thats a very useful chart!

mikey

Yes it is useful, thanks.

You can make nearly all live steam locos go very slowly even without radion control.

I try and run mine at realistic speeds to my eye. I have never actually measured it but now I have the table I will do just that at the next exhibition!

Here are some clips of my machines running quite slowly/realistically......I think.