Horsepower = Thrust ???

[bartiny]

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.

[spartacus]

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.

[Nos4r2]

As per your edit It's pointless. Electric outboards are crap. You'd be better off with a 2hp petrol.

[ShinyShoe]

You need battery and battery may be the cause of your problem.

Oars would be more use ;-)

[bartiny]

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

[spartacus]

Originally Posted by bartiny

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?

[bartiny]

Originally Posted by spartacus

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

[uncle al]

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.

[bartiny]

Originally Posted by uncle al

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.

[Jorgos]

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... ..

[clydeoutboards]

Hi

based on the small point of 2 crews dying this year who tried to use electrics as aux engines on the west coast of scotland and several more being rescued I would also say a big no unless it is the torqeedo and you have lots of batteries. I would even then test this as running them a full rev's drains the batterys v v quick.

[bartiny]

Originally Posted by clydeoutboards

Hi

based on the small point of 2 crews dying this year who tried to use electrics as aux engines on the west coast of scotland and several more being rescued I would also say a big no unless it is the torqeedo and you have lots of batteries. I would even then test this as running them a full rev's drains the batterys v v quick.

Thanks for all replys

I think I can safely say that I have shelved the idea

[matt h]

i think Maximus has one of those egg wisk's on his boat.! he loves it!

[willk]

Originally Posted by clydeoutboards

Hi

based on the small point of 2 crews dying this year who tried to use electrics as aux engines on the west coast of scotland

That's very sad. I can appreciate someone not managing to get home because an aux failed, but dead? Where were these incidents?

[mick]

One of the Redbay lads told me that most call outs were for an aux that had broken down so your better off with twins

[kerny]

Originally Posted by mick

One of the Redbay lads told me that most call outs were for an aux that had broken down so your better off with twins

Why not just a reliable auxiliary (petrol)

[mick]

Cos there rubbish and won't push a rat up a drain pipe

[AJ.]

As I mainly boat in the solent I tend not to bother with my aux unless I am going somewhere else and not in company with other boats. I have a 9.8LS 2 stroke tohatsu which just fits with half an inch to spare on the transom. I tried it out back in the summer admittedly there was no wind, tide and calm got 6.5knts. Against wind and tide that will be significantly reduced but should keep me out of trouble...... I hope!

[clydeoutboards]

Originally Posted by willk

That's very sad. I can appreciate someone not managing to get home because an aux failed, but dead? Where were these incidents?

one was just north of sky in the minch (sorry not sure of spelling) the other was a shetland 570 that was way out further south on the west coast.


Dave

[Poly]

Originally Posted by clydeoutboards

one was just north of sky in the minch (sorry not sure of spelling) the other was a shetland 570 that was way out further south on the west coast.

Its Skye

Presumably two accidents with a common cause are the subject of an MAIB investigation?