Denny,
I had so many readings I ran out time to type them all in when I
wrote that message, And so just put up a sample. I did use full
power at times in the test. I've now typed in all the data and I'll
add all the readings below.
The maximum it pulled is 4800 watts so it does easily meet its
expected 4kw. I have tried two Cruise 4's - the first one was demo
model belonging to Claude, the Torqeedo distributor here. We mounted
it temporarily to prove that it would be adequate for this boat. The
interesting thing is that maximum we saw on this motor was just a
little over 4kw. 4200 or 4300 watts I think. And in reverse its
maximum was 1500 watts.
My Cruise 4 performs slightly differently, perhaps the controller has
some variability. Astern it pulls 2800 watts, and as noted, it does
4800 ahead.
The spec shows that it is limited to 50% power in reverse. It easily
cavitates in reverse. But I've seen this with many props - perhaps
most props. That is, they are much less capable in reverse.
We took particular note of the noise levels on this run. Also on
board was a friend who has two Torqeedos for his cat, but yet to
launch. So we were both attentive to this issue.
In the cockpit the noise level of the motor was about the same as the
noise from the wake. We talked easily without any noticeable
intrusion from the motor. When on the bow, the noise of the her
cutting through the water was the main sound I could hear. Listening
very intently I could just make out the motor whine. So it was
pretty much unobtrusive, even at full throttle. So we were patting
ourselves on the back at having made a good choice.
Then I went below and noticed the whine was more intrusive there.
Probably because the sound of wind and water was pretty much absent.
Where I have the motor mounted in the well, there is door that opens
toward the main cabin, and due to some still temporary wiring I
couldn't shut the door properly and so the noise was coming
unobstructed from the motor right into the cabin. This will be
improved when I complete the wiring and can shut the door - then I
expect it will be at an unobtrusive level.
By way of comparison, I also have a MinnKota 55 trolling motor and I
can't hear it at all. Its actually too quiet because I get no
feedback about how fast the motor is spinning.
Cheers
Chris
2600 6.5
2600 6.6
2600 6.7
2600 6.4
2600 4.5
2600 4.5
2650 4.3
2800 3.7
2800 3.9
2800 3.6
2880 3.4
2900 3.3
2730 3.8
2700 4
2760 4.2
679 4.6
700 4.4
840 2.8
850 2.4
820 2.9
700 3.9
850 3
860 2.8
800 2.4
800 3.2
830 3
750 3.9
740 4
2100 5.7
3300 6
4700 7.2
630 2.4
650 2
640 2.1
990 2.4
960 2.6
910 3.2
950 2.8
900 3.1
1500 4
1400 4.1
1400 4.3
1380 4.4
2000 4.9
1990 5
2000 4.9
1000 3
2000 3.8
1950 3.7
2100 4.2
2100 4.4
2100 4.1
2500 4.4
4600 5.5
4500 5.9
4400 6
4200 6.2
4100 6.6
4200 6.4
4700 6
4800 5.7
4800 5.5
On 05/08/2009, at 12:35 AM, dennis wolfe wrote:
> Chris, Thanks for the data anyway. With such slow speeds and
> sailboats with the great windage the mast represents repeatable
> testing is a challenge. You really need slack water with a mirror
> smooth surface.
>
> You might try plotting the points in an Excel graph and then having
> the computer fit a curve to your data points.
>
> I'm curious why the max power is 2900 watts. Isn't the motor
> supposed to pull 4 kw at WOT? How is the noise level of the new
> Cruise 4 model?
>
> Denny
> .
>
[Non-text portions of this message have been removed]
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