knapper's ScaleSpeed Tool Blog

I have a printed chart with timings over 1, 4 & 8 feet for speeds from 1 mph to 25 in 1 mph steps then 5 mph steps to

50 mph, then 10 mph steps through to 120.

I have subtle 4 foot markings on sleepers & use my wrist stop watch ....... a 20 mph goods train in 4 mm is quite slow.

Good fun though & you need to be quick on that watch !!!

 

I should add I hate fast model trains, probably why I love freight

 

Nice one knapper.

 

Dad-1

Thanks.

 

The most common traffic on my layout tends to be a trundling freight.

Hi

 

What is the formula behind this calculator please?

 

Trying to work out speed over 609.6mm

 

Many thanks

 

Mike

 

 

On a recent Whats Neat, a device to measure scale speed was shown.

http://trainelectronics.com/products.htm

11 hours ago, mikesndbs said:

What is the formula behind this calculator please?

 

Trying to work out speed over 609.6mm

 

It should be "speed = distance / time" with whatever factors are needed to convert from the input units (ie millimetres and seconds) to the desired output units (kilometres or miles per hour).

Hi Mike, 

 

Sorry for the delay in getting back to you, I only just noticed your question. I've had a look at the code to check exactly how it's done, and as Dungrange points out it's not a particularly difficult calculation, however as I did it as a bit of quick project I didn't comment the code too well (as in not at all, which isn't something I would usually do while coding!)  so there are one or two things in there that I can't remember why I needed to add. I'll have another look through the code so I can explain how it's done, and look at adding the option to add time manually so you can skip needing to use the timer. It shouldn't take me very long to do, but I'll post here a explanation of the calculation in the next few days once I've familiarized myself with the code again.