Hi Mike,
I checked out your pictures, nice set up. I've got a few questions.
1) It looks like you're using solid couplers, without any isolating flex coupling in the drive shaft. Without the coupler, how did you verify your drive to driveshaft alignment? Do you think that you might have additional corrosion issues since the propellor is grounded to the engine?
2) It looks like the electric drive pulley is directly connected to the transmission output flange. When you're in electric only mode, is the transmission in neutral? Do you think that there is any minor load (loss) spinning the transmission when the engine isn't running?
To try to quantify the answer to the last question, can you run the electric motor without bolting the unit to the transmission output flange, or is the transmission used as the axial and thrust bearing in this setup?
It sounds like you're geeting good results and the system is meeting or exceeding your expectations. You can't ask for much more than that out of a prototype..
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "Mike Gunning" <mike@...> wrote:
>
> I have posted pictures of my 1976 Columbia 9.6 Diesel Electric Hybrid demo boat.
>
> http://groups.yahoo.com/group/electricboats/photos/album/1469361680/pic/list
>
> The project included the installation of a rebuilt Yanmar 2QM15 of the same vintage. The boat had not moved from it slip for over 3 years and required a complete update of the interior but had great running and standing gear.
>
> The engine was mounted 6 inched forward with an extension of the shaft because the engine stringers were not in the right place for the motor. The initial sea trials performance of the system has been good. The diesel and electric both push the boat at hull speed. At 4.5 knots the diesel will run the electric in generator mode at 1.2kw and that is about 25amps at 48v. At 25amps the electric will push the boat at 4.5 knots. Seems just about right
>
> This is our 7.0 Weekender version without the clutch system. The boat has 100 AH AGM batteries with a QuickCharge SCO4825 (25 amp at 48v) charger.
>
> Mike Gunning
> Electric Yacht of Southern California
>
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