Dyson2972, on 19 June 2010 - 01:02 AM, said:
I did some testing at what speed does 7938 derail on a curve:
The engine by itself will derail on a curve at a speed of 5.
An engine and two cars will derail at a speed of 6.
An engine and three cars will derail at a speed of 6.
An engine and four cars will derail at the top speed of 7 (most of the time).
Thanks for the info, this looks fairly similar to the previous passenger train, the only difference being
that the engine by itself does not derail on setting 5 due to its exceptionally low center of gravity
(but it does derail in setting 7). The useful settings for the 5-car train are 3,4,5 (or 4,5,6 when I use
the other motor, the two RC motors that I have are not equally fast). Below that, the motor is struggling,
while above that, you get to do some repairs.
To make the train easier to use, I've been considering replacing one of the 6 batteries by a dummy. That
reduces the voltage to 7.5V max (for 5 regular batteries) or 6V max (for 5 rechargeable batteries, which is
what I use). I haven't tested this, but I suspect that the RC mechanism will still work even when the
batteries supply only 6V, and that this should be enough to prevent derailings (the idea is to use the
train at a train show and let kids run it...).