T-Pain Is On A Boat: [Electric Boats] Results on paper including new under way dc voltage draw and amp draw

Monday, April 22, 2013

[Electric Boats] Results on paper including new under way dc voltage draw and amp draw

significant less amp draw while under way

My actual pulley ratio now is 4:1 = 1100 rpm as high as fast as it will turn so if changed to 6:1 would get up to 1650 rpm ( im guessing a little higher with the extra 33% torque )

throttle motor amp under way underway dc    shaft Hp developed boat HP developed possible    ( I DIDNT MEASURE BOAT SPEED BECAUSE IT WAS THE MOST UNRELIABLE MEASUREMENT OF THE LOT )
level rpm draw amp draw dc voltage voltage rpm at motor speed at shaft eg ? 6:1 HP at shaft    IM CONFIDENT THAT 60% POWER WAS AROUND 2.3 -2.5 AND TOP SPEED OVER 3 MPH )
amps X volts motorHp x gear ratio
750

10 120 2.3 16 18 30 .05 .2 .3
20 310 4.6 4.1 35 38 77 .23    .92 1.38   actual pulley ratio is 4:1
30 490 7.0 5.4 54 56 122 .52 2.08 .312    so motor HP x 4 = Hp at the shaft ?
40 650 9.8 7.2 72 74 162 .96 3.84 5.76
50 790 12.5 9.6 93 92 197 1.53 6.12 9.18
60 910 15.1 11.7 110 108 225 2.17 2.3 8.68 13.02
70 1005 17.1 13.9 125 120 251 2.73 10.92 16.38
80 1180 18.1 16.7 140 128 270 3.08   3.2 12.32 18.48
90 1100 18.6 18 148 128 275 3.2 12.83 19.2

orest

On 2013-04-21, at 5:30 PM, Orest Iwaszko wrote:

HI J , The transmission remains in neutral while the electric motor turns the propeller shaft . When I want to go fast I take off the elecric motor belt , start the big diesel and put the transmission in gear. The big diesel is 120 HP and pushes the boat to aprox 7-8 mph.

On 2013-04-19, at 11:41 AM, c.joseph@kbelectronics.net wrote:

Hi Orest,

I don't know that a 3 HP motor can run that transmission. what size motor
was originally connected to that transmission?

Regards.

Charles J. Joseph
Applications Engineer
KB Electronics, Inc.
P. 954-346-4900 X 1128
F. 954-346-3377
c.joseph@kbelectronics.net