Saturday, January 30, 2016

Re: [Electric Boats] Re: conversion performance

 

Hi, Bob,
 
It must have been a day to be on the water! 
Thanks for the data, quite informative.
Looks like you are pushing about 5 HP at full throttle.
 
What body of water were you sailing?
 
Thanks,
 
Ken Cooke
Kentucky River, USA
 
 
Sent: Saturday, January 30, 2016 9:06 PM
Subject: [Electric Boats] Re: conversion performance
 
 

Finally got some performance data today.
Velocity values are over ground (GPS), not through the water.
The first set was taken going into a < 4 knot headwind and an estimated ~0.1 knot current.
The second set was taken on a reciprocal course with an estimated tail wind of 4 knots.
Outdoor temperature was around 65F, 18C.
The boat's bottom was cleaned ~3 weeks ago. There is not a lot of bottom growth this time of year.
There's a bit of imprecision in my measurements in that this was my second sea trial and I'm still getting to know my new instruments. Also, some of the values took awhile to "settle down" and I probably could have been a bit more patient.
It would be nice to be able to gather performance data in an automated way.
 
 
Knots    Amps    Volts    Watts
1.6        10            51.9    519
2.4        18            51.9    934
3.1        28            50.8    1422
3.7        43            49.8    2141
4.4        65            49.8    3237
5.0        92            48.8    4490  (full throttle)
 
Return course:
1.8         7              51.1    358
2.5        12            51.1     613
3.2        17            50.9     865
3.4        21            50.9    1069
3.7        30            50.9    1527
4.3        45            49.8    2241
5.2        89            48.8    4325  (full throttle)
 
Ox 1976 C&C 33
LOA: 32.87' / 10.02m
LWL: 26.42' / 8.05m
Displacement: 9800 lbs./ 4445 kgs.
Propulsion System: Electroprop Racer
Batteries: 4 X Northstar 210 FT Blue+
Motor: Motenergy ME 1114 Rev A
Controller: Sevcon Gen 4 275 Amp
Current Prop: 2-blade fixed 16X10X1
(original - came w/A4)
Jax, FL USA
 

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Posted by: "Ken Cooke" <ken.cooke@canewoods.com>
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