I think I've found my generator head, a 7.5KW Stamford Newage

[BruceM]

Hi Marcus, Alas, the equation for ripple yields 330K uF, not 330uF. 40 amps is a hell of a current to slam into a capacitor bank.  In fact, when I run this on PSUD with a realistic ESR for the capacitor, a it shows 3-7 volts of ripple depending on the generator impedance.  This is why as currents go up, you always see LC (inductor first) filters used.  

The same 40 amp, 120V put into an LC filter with a 0.1H choke and 3K uF cap (both reasonable values) gives you about 1V of ripple (depends on the ESR- equivalent series resistance of the capacitor). I was lazy and ran this on PSUD.  Note that a higher ripple is certainly acceptable, so the capacitance could be less; 1K uF would give you 3 volts ripple.  0.01H or 10mH for the choke would give you 10V ripple.

Edit-  I just ran something like Halfcrazy's capacitor only filter.  With a single 10K uF capacitor with 38mohm ESR (a $40 cap) I get 20 volts of ripple at 25 amps.  Since his setup is acceptable to the Midnight 200 Classic, I guess 20V of ripple is just fine.  He didn't state his measured ripple voltage.

[Henry W]

I got an email from the engineer that I worked with a while back. The two bearing generator head has a completly differant rotor shaft than the one bearing generator head.

I stand corrected about the stub shaft that Stamford had available for the single bearing head. The stub shaft was made by an aftermarket company to convert these heads to a 2 bearing. But there were other special parts needed to make it work. The engineer does not know the company that made the special kit.

The Engineer emailed a colleague in Stamford and hope to hear back from him in the morning. Hopfully some good news will be coming.

Henry

[Simtech]

I got an email from the engineer that I worked with a while back. The two bearing generator head has a completly differant rotor shaft than the one bearing generator head.

I stand corrected about the stub shaft that Stamford had available for the single bearing head. The stub shaft was made by an aftermarket company to convert these heads to a 2 bearing. But there were other special parts needed to make it work. The engineer does not know the company that made the special kit.

The Engineer emailed a colleague in Stamford and hope to hear back from him in the morning. Hopfully some good news will be coming.

Henry

Thanks for looking into this again, those gen heads would be a great resource.

[Henry W]

Just got an email from the engineer yesterday and nothing is available.

Henry

[Simtech]

Oh well, I still think I'm going to get one and tinker with it.  The second bearing might be held in place with JB weld and strap iron when I get done with it but it's still worth a look.

Fun too.

[dieselgman]

Just need a good size lathe and some steel and aluminum blanks to experiment with... shaft extension seems to be the problem area.

dieselgman

[Henry W]

If someone here can get a kit made at a reasonable price to fit those generator heads there might be some money to be made.

Henry