Quote:
Originally Posted by ol'George
Things to ponder:
The kool factor of building a accessory to go on your tractor is very rewarding.
sometimes it is practical sometimes not.
Being older now, I tend to not fuss as much as I once did.
It takes a bit to install/remove the power generator on the front of a tractor
after you have it finished,
much like a snow thrower/blower.
I wonder if a 2 to 1 ratio is practical?? sounds like a lot to expect of an engine unless the generator head is designed to run @ 1800.
Today I see a lot of generator sets sell quite inexpensively @ auctions C/ list
& local papers. $150-$250
I would think it less expensive/easier to obtain a stand alone unit that can be pulled or set in a cart behind the tractor.
or even on a rear mounted " carryall"
That would free up the tractor to go-fer things/tools etc.
Just some thoughts, not to rain on your parade. 
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George a 1800rpm generator is a 4 poles unit and they cost a leg+a arm but I'm sure your already know it so I cut the crap and just let's call those 3600rpm unit "Standard head unit", most companies build them to produce a constant 500W per HP since 1hp=745.7 watts we have a safe margin.
I think the 16hp of the 1650 got enough torque to power a 4 to 5Kw gen
head at 1800rpm using a 1 to 2 ratio pulley but there is no way this setup can be efficient or practical like a stand alone unit.
(Test need to be done first so I speculate here)
This is just a fun project you can rely on in a emergency case or just to power some outdoor stuff for a short period of time, a cheap "Life saver" if you prefer.
Oups...Almost forget! Merry Christmas all !