Hurth HBW 100 gearbox reduction ratio?

Posted by michel.capel (michel.capel@…>)

Hi all,

I’m in for a new propellor, but I can’t read the ID plate on the
gearbox.

I have F44 hull # 4 from 1981.
There’s a Perkins 4108 (lowline, approx 1980) in it with a Hurth HBW
100 gearbox. These gearboxes were made with several reduction ratios.

Does anybody know which reduction would be the most likely one on my
Hurth gearbox?

Thanks!

Michel