[GreenKeys] Anyone interested in 100WPM?

[Jim Haynes]

On Thu, 23 Jan 2020, Duncan Brown wrote:
> Howard,
> The M15 was designed (in the late 1920s)  for 60WPM, only.  I have hear that 
> during WWII, due to the high volume of traffic, some M15s were modified for 
> 100WPM, but it was difficult to keep them running at that speed!
>
And 75 WPM was a standard speed for a 15, but definitely not 100.  It was
used in WW-II at 100 in a limited way, where the need for traffic volume
outweighed the extra maintenance required.  And there was a special kit
of parts for the purpose, I think mostly involving stiffer springs.

The M28 was designed for 100 wpm from the beginning.  In the 1950s the
FAA experimented with running 15s at 100 wpm and decided they were better
off buying 28s.