Electric outboards Lbs thrust to hp conversion?

[matnoo]

If a motor had 54 lbs of thrust, (very aproximately) what horsepower would it have?

a rhino vx54, is on sale on ebay, obviously im expecting them to be less powerful than petrol outboards, but would like to get an actual quantitive value.

Mat

 

[Evadne]

There was something about this last week (or the week before?) on here, and I would be cautious about directly comparing a manufacturer's quoted hp for a petrol engine with the measured current on an electric motor, let alone the pounds thrust (bollard pull?) measurement.
Based on my own 24lb motor, which comes out at rather less than 1hp but is quite capable of moving the (7'6" grp) tender and us around as long as it's not into an F5, I'd expect a 54lb to behave like a 2hp two stroke when pushing a tender, i.e. more than enough to move it quite rapidly two-up, into wind and weather.
Hope this helps

 

[William_H]

Pounds thrust of a motor propeller combination would be a variable quantity I would think. Would you measure the thrust the bolt can generate while trying to tow away a jetty? Perhaps but the propeller would be quite inefficient possibly stalling. Unless it was a fine pitch prop thrust would improve as the boat moves through the water and so the flow across the blades is at optimum angle of attack however the thrust then would be that push on the boats transom which is trying to accelerate the boat. As the boat increases in speed the thrust would fall as the prop can not accelerate the water to exceed the boat speed.
It looks like a variable pitch prop would be ideal.
Fortunately electric motors have a far better range of torque at low speeds compared to internal combustion so variable pitch prop is not so necessary but still it would make accurate thrust meaurement an interesting question.Evandne 's experience might be as good a measurement as any. olewill

 

[nordic_ranger]

I used to own a small Johnson that had 54lbs marked on it and 2hp.

 

[cpedw]

There was a description here recently.

Derek

 

[LadyInBed]

Try here

 

[paulburton44]

I have a rhino 54lbs thrust.....it pushes my parker 235 along at 2.5knots with a bit of head wind...

 

[pvb]

Rhino electric outboards...

I've seen the VX54 listed on a German website as being equivalent to 1.3HP, which is probably about right. Rhino say the VX54 takes 72A at full thrust, which means that an ordinary battery (say 100Ah) is going to be flattened very quickly. I think Rhino electric outboards are basically Motorguide products, and the VX54 appears to be essentially similar to the Motorguide Thruster 54HT, which is technically a "freshwater" motor - so corrosion could be a problem.

As usual, eBay ads can be a bit confusing. I've seen the VX54 listed in an eBay ad as having a RRP of £370, but I think this is rather overstated, as another eBay seller is offering it at £135 on "Buy it Now". For that money, it could be worth a try, but be prepared for the heavy drain on the battery.