Orest
Just going to have a look at this in a table. Sounds much better
The gear ratio does NOT affect the HP
The gear ratio DOES affect the torque so for a reduction ratio like yours multiple the torque by the ratio and you have the torque at the prop
For an overdrive ratio divide the torque by the ratio – ie torque output falls
Yours,
Andrew Gilchrist
fastelectrics.com
Australia
0419 429 201
From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of Orest Iwaszko
Sent: Tuesday, 23 April 2013 4:19 AM
To: electricboats@yahoogroups.com
Subject: [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 &nbs! p; ;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 13.0270 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
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