If 1 ft / sec. = close to 60 smph, how many seconds per one foot = 70 smph?. Or how many seconds per 3 feet (the background poster width I time the locos against) = 70 smph?
I know, locos rarely hit this speed. But I would like to know.
I get improbable answers from my calculations at this time of night…like .17 seconds.
The difference in scale speeds you cite can be expressed as a percentage. It is 60/70, or 0.857, which translates to 85.7%. That is, the 60 is 85.7% of 70. So the difference is a mere 15% (roughly) to keep it simple. So, taking 15% from the second/60 gets you 0.85 seconds at 70. That should be close enough.
60*X=70 its a 0.17 increment… 1.17 seconds per foot.
70*x=60 0.857 feet/second. 0.857x12= 10.24inches/second
Edit: I did it wrong, don’t listen to a word I say…
You didn’t metion what scale but if you are HO, Joe F. has a great chart here
http://siskiyou-railfan.net/e107_plugins/forum/forum_viewtopic.php?2337
Scroll down. It dosen’t mention 70 mph but doing some quick math, I would say 6.5 50’ cars in 3 seconds would be it
ratled
I’m not going to get into this argument again, but here is the other thread…
I get ‘The Page Cannot Be Found’.
Check this out:
press here
A.
FWIW the larger your sample, the more accurate your reading will be…that is, timing the train for only one (real) foot won’t give you as accurate a measurement as a longer sample would, like say a scale mile or half mile.
Thanks to you all.
Lying in bed I also was able to focus and realize that 10 smph in HO is 1/6 of 1 second = .16666. So subtracting .166 from 1 sec gives me .834 sec (or more usefully 2.5 sec for 36 in. across my backdrop poster, or 5 sec acoss two posters for 70 smph [yes, I’m afraid I can still see the seams in my posters as I haven’t finished them yet].)
I really like the links guys.
For those of you with no other handy clock, here is a link to a nice free one…which will run in hundredths for accuracy. Download the free one, not the shareware one.
http://www.springcreeksoftware.com/
This gets you to the main site, click the button in the left for “free stuff”. There is a large and small format clock to download…no expiry or license.
The large one looks like this when you run it ( I have the computer handy to the layout for using D. Pro).
The small one has no ad on it.
Nice link! Thanks.