Is this suicide?

[lawrence567]

I've been offered a 15hp outboard, my question is, attaching this to a 2.7m sib that's rated to 7hp. Is it suicide? Or will it be bloody good fun?

[LWman]

Bloody good fun! Just check the weight though

[willk]

Bloody good fun at first. Maybe suicide later

My experience suggests that 10hp is all that is needed to explore the limits of a 2.7m SIB (one up). With more weight O/B, a bit of extra power would be nice. The question is, will your transom take the strain? If you pour on the sauce carefully, maybe...

FWIW, I'm seeing over 18kts with my rig, and TBH, the boat feels fine and is controllable, but the water needs to be mirror calm. I would suggest that 15-16kts is the practical max for this type of rig.

I'll let someone else warn you about insurance

[lawrence567]

I'm not going to go mad with it, it'll always be 2 up, if I can get it for a good price I'll buy it and have a go and if it's too much I'll either sell the boat and get something bigger or sell the engine and get something smaller!

[LWman]

Originally Posted by willk

Bloody good fun at first. Maybe suicide later

If your gonna die, you might aswell be laughing when you do! Haha. Agreed a 10s probably plenty on 2.7. But if the price is right.. you can always power down but you wouldnt be able to power up something smaller

[Bigmuz7]

Originally Posted by willk

but the water needs to be mirror calm.

Hehe let it rip .. just make sure you have the kill cord working

[LWman]

..and tied around your wrist! :P With a life jacket on

[kubcat]

In my opinion the only thing to worry about is the transom. Keep an eye to see if it is separating from the tubes while underway. Speaking from experience, if it does separate it will probably start slow at first.

[Screaming04]

Natural selection.

[renegade]

once put a 9.9 old merc on a 2.7 roll up at power it bent the transom down almast to the water line lol but was fun

[willk]

A thought:

I had (without evidence) assumed that the OP had an airdeck SIB, having considered the low HP rating I now suspect this is probably not the case? If the SIB is a slatted floor model, I'd think that a folded boat would be the outcome. Even with an airdeck, correct inflation and a cautious tiller hand would be essential...

[TIMO]

Originally Posted by Screaming04

Natural selection.

i got a 40 hoss on a transom rated for 30 ,, looks like i may get naturally selected too .

[Anchorhandler]

Originally Posted by Screaming04

Natural selection.

'Darwin Awards' come to mine also......good Youtube fodder though!

Simon

[lawrence567]

Thanks to the helpful replies & the, OP your a bell-end replies.
I've spoken to a few people at the weekend, mainly marine engineers & the like from various shops.
The overall opinion was that a 15hp would'nt be the best way to go, but i should be fine with a 9.8 or such as long as i'm careful & keep an eye on things!
For the record the boat is a SIB & apparently the power rating is a for a 4 stroke motor, whethe that is true or not i don't know.
For the ones portraying i'm some sort of fool, it might be bread & butter knowledge to you but to someone who's a beginner it isn't so obvious!
Anyway, the search continues for an OB!

[ajrunke]

You might do one of these

‪power boat slightly over powered 11ft 40HP‬‏ - YouTube

...which looks like a hell of a lot of fun until you fall backwards into the prop.

[chewy]

[QUOTE=lawrence567;411194]The overall opinion was that a 15hp would'nt be the best way to go, but i should be fine with a 9.8 or such as long as i'm careful & keep an eye on things!
QUOTE]

I'd find a 9.8 that weighs the same as the 15 and then justify it to myself that if they both weigh the same then everything will be ok.
I wanted to put a 70 on my SR4 but was advised against it, would be great fun though!

[walruz]

Originally Posted by ajrunke

You might do one of these

...which looks like a hell of a lot of fun until you fall backwards into the prop.

How about getting a prop with a MUCH bigger pitch?