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Old 12-09-2018, 04:23 PM   #13
alfamike
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City: Camarillo
Join Date: May 2015
Posts: 438
Transmission

The engine you have definitely was run at 1800 rpm as that is the standard generator run speed for 60 Hertz A/C power here in the USA.

As I see more of what your doing, & I run some numbers over here, you definitely need to go with the 10 degree down angle Twin Disc MG-5050A transmission.

It will handle the engine HP as is now or when you up grade it to higher 365 HP neighborhood as well & it is rated for up to 3300 engine rpm.

For your displacement & design & engine I would think a transmission ratio of 1.8 to 1 ratio in the trans would be good for 12 knots at 2600 rpm with some propeller pitch tweaking depending on what you do with the engine & HP available.

Obviously you may go with the engine as it is now, which if not after cooled is actually about 220 HP & later up grade to the higher HP options you may want, at a later date.

And then you could also run all day - 24 / 7 - at 8 knots running in the range of 1600 to 1800 rpm and get great fuel economy.

Let me know if I can help.

Sounds like a fun boat.

Good luck.

Alfa Mike
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