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Old 23 November 2013, 16:32   #1
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Horsepower = Thrust ???

Probably a simple question but here goes

I am thinking about a electric outboard as a auxillery as my Mariner 4hp will not fit on the transom with the 25 hp (cannot get full lock) and it gets in the way carrying it in the sib.

So as the 4hp pushes the sib along very well I would like (I think) a simular powered electric motor so is there a formula to work out how many lbs of thrust I will need to equate to 4hp.

Also any positives or negatives for this approach?

Sorry just done a search looks like 17lbs = 1hp (uncle al) and judging by some of the comments it might not be such a good idea after all.
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Old 23 November 2013, 17:03   #2
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Electric motors are the preserve of the freshwater reservoir or canal. If you're heading to sea then get yourself a trusty Tohatsu 3.5hp auxilliary engine. Bullet-proof engineering at its best, and slim enough that even Victoria Beckham would raise her Dolce Gabbana sunglasses for a second glance.
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Old 23 November 2013, 17:03   #3
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As per your edit It's pointless. Electric outboards are crap. You'd be better off with a 2hp petrol.
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Old 23 November 2013, 17:29   #4
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You need battery and battery may be the cause of your problem.

Oars would be more use ;-)
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Old 23 November 2013, 18:01   #5
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Thanks for the replies spartacus, Nos, Shineyshoe, looks like i will just have to keep loading it in the sib hoping it does not smack me in the gob 1 day

Can't even put a bracket on the transom as the launching wheels brackets are in the way and can't be moved far enough

Got to admit though carrying it does make a big difference with my confidence (knowing its there) even if I don't think I will need it

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Old 23 November 2013, 18:36   #6
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Quote:
Originally Posted by bartiny View Post
Can't even put a bracket on the transom as the launching wheels brackets are in the way and can't be moved far enough
Carrying it in the boat is going to be a pain, unless you can mount it somewhere. Apart from anything the vibration and knocks its likely to take, plus you're tripping over it. What about investing in a trailer and ditching the launch wheels?
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Old 24 November 2013, 04:20   #7
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Quote:
Originally Posted by spartacus View Post
Carrying it in the boat is going to be a pain, unless you can mount it somewhere. Apart from anything the vibration and knocks its likely to take, plus you're tripping over it. What about investing in a trailer and ditching the launch wheels?

Mmmmm, watch this space

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Old 25 November 2013, 14:50   #8
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I used to call those electric trolling motors egg wisks, If I had any to repair I just put them in a corner out of the way and forgot the damn things.
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Old 25 November 2013, 15:48   #9
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I used to call those electric trolling motors egg wisks, If I had any to repair I just put them in a corner out of the way and forgot the damn things.
Safe to say your not a fan

I must admit I thought that I might have got "well they are ok but" reply as in theory it would suit boaters like me (coastal, inland, estuaries, and the like) generally no more than 1 or 2 miles off shore as it would only be needed if I had a problem with the main engine so again in theory might never be used in anger so to speak.

To be honest though it is only the fact that I cannot fit my 4hp aux on the transom without it being a potential hazzard as it restricts tiller movement that am / was considering 1.

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Old 25 November 2013, 16:04   #10
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As you have a "small" boat I would say that a 2,3 honda will be perfect as is very light. If you ensint on electric , then Torqeedo 503 - 1003 will give you plenty of power (2,5 -3,5) but not unlimited miles... ..
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