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Old 28-08-2018, 14:07   #1381
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Re: Oceanvolt Hybrid Motor

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Originally Posted by valhalla360 View Post
In terms of the Magic Electric HP, I absolutely agree.

But if you put the same prop on, the prop HP will be the same for a given RPM at the prop regardless of power source.
There's also the majic of maximum torque at zero RPM.

Exactly what is a propeller doing for you at zero RPM?
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Old 28-08-2018, 14:22   #1382
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Re: Oceanvolt Hybrid Motor

Quote:
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There's also the majic of maximum torque at zero RPM.

Exactly what is a propeller doing for you at zero RPM?
Start-up and Acceleration from zero requires torque.
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Old 28-08-2018, 14:37   #1383
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Re: Oceanvolt Hybrid Motor

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Start-up and Acceleration from zero requires torque.
I can turn the prop with my little finger. Not much torque involved at close to zero RPM.
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Old 28-08-2018, 15:02   #1384
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Re: Oceanvolt Hybrid Motor

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I can turn the prop with my little finger. Not much torque involved at close to zero RPM.
Try stopping the starter motor with your little finger.
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Old 28-08-2018, 15:23   #1385
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Re: Oceanvolt Hybrid Motor

Quote:
Originally Posted by 44'cruisingcat View Post
There's also the majic of maximum torque at zero RPM.

Exactly what is a propeller doing for you at zero RPM?

Trying to break that mooring line you wrapped around it?
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Old 28-08-2018, 15:25   #1386
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Re: Oceanvolt Hybrid Motor

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Originally Posted by DumnMad View Post
Try stopping the starter motor with your little finger.
Starting an engine is different from turning a prop, don't you think?

Ever turned your fre spinning prop by hand? Ever turned your not-so-free-spinning engine by hand?


The full torque from 0rpm doesn't help the electric motor in boat propulsion because the prop just can't make use of this torque.
OK, the electric motor can increase the prop's RPMs quicker than a diesel. But this doesn't make a difference in propulsion. Overall boat acceleration is quicker by a few fractions of a second.
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Old 28-08-2018, 15:28   #1387
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Re: Oceanvolt Hybrid Motor

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Trying to break that mooring line you wrapped around it?
Maximum torque can help rip out the saildrive and sink the boat to cash the insurance. Easier then selling the boat.
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Old 28-08-2018, 16:31   #1388
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Re: Oceanvolt Hybrid Motor

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Originally Posted by 44'cruisingcat View Post
There's also the majic of maximum torque at zero RPM.

Exactly what is a propeller doing for you at zero RPM?
All torque, no action
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Old 28-08-2018, 16:36   #1389
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Re: Oceanvolt Hybrid Motor

High torque at low revs may also help if you run aground and your prop is buried in really thick mud. )
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Old 29-08-2018, 07:11   #1390
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Re: Oceanvolt Hybrid Motor

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Start-up and Acceleration from zero requires torque.
Because cruising boats with 7-8kt top speed frequently participate in drag races?

So little torque is needed to get a prop started at zero RPM, I suspect you would have difficulty measuring the difference in RPM increase just looking at the gauge.
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Old 29-08-2018, 14:37   #1391
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Re: Oceanvolt Hybrid Motor

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High torque at low revs may also help if you run aground and your prop is buried in really thick mud. )

Yet another reason monos are better. Canít get the prop stuck in the mud...sorry couldnít resist.
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Old 29-08-2018, 14:44   #1392
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Re: Oceanvolt Hybrid Motor

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Yet another reason monos are better. Canít get the prop stuck in the mud...sorry couldnít resist.
Well if that's your qualifier for what's best, then I guess my cat with dual outboard motors that retract is better than a mono.

You wrote it, not me!
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Old 30-08-2018, 22:45   #1393
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Re: Oceanvolt Hybrid Motor

Engines installed. The large stainless box behind the motor is the water heater that has been moved from under the bunks to make way for the batteries.
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Old 30-08-2018, 23:13   #1394
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Re: Oceanvolt Hybrid Motor

svReality,

Thanks for that post, finally back on topic. Lookin good

Are you planning on using Propspeed or something similar on the leg & props?

Our Servoprops will be on the shipment soon, so I'd love to hear from you after you splash her and have a zoom around in trials.
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Old 30-08-2018, 23:16   #1395
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Re: Oceanvolt Hybrid Motor

Yep propspeed all round. hoping for trials early Oct
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