Oceanvolt Hybrid Motor

[44'cruisingcat]

Originally Posted by valhalla360

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?

[DumnMad]

Originally Posted by 44'cruisingcat

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.

[rabbi]

Originally Posted by DumnMad

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.

[DumnMad]

Originally Posted by rabbi

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.

[StuM]

Originally Posted by 44'cruisingcat

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?

[rabbi]

Originally Posted by DumnMad

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.

[rabbi]

Originally Posted by StuM

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.

[bluenomads]

Originally Posted by 44'cruisingcat

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

[StuM]

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

[valhalla360]

Originally Posted by DumnMad

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.

[transmitterdan]

Originally Posted by StuM

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. Can’t get the prop stuck in the mud...sorry couldn’t resist.

[sailjumanji]

Originally Posted by transmitterdan

Yet another reason monos are better. Can’t get the prop stuck in the mud...sorry couldn’t 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!

[svReality]

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.

[BigBeakie]

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.

[svReality]

Yep propspeed all round. hoping for trials early Oct