2 Stroke 9.8 or 4 stroke 6hp due to weight

[Notebook]

Thanks all once again.
It’s up to me and I appreciate your input.
Thanks

[Fenlander]

>>>A two stroke 15 hp weighs about the same as a 9.8 hp... 10ft Zodiac Air floor averages about 37 KMH on a 15

Just for the chat 909 the specific 9.8 2-stroke Notebook is considering weighs 26kg... some 10kg less than the 15hp 2-strokes.

In terms of speed I have experience of the SIB he's bought with that very 9.8. It will make 33km/h with two adults, full fuel tank and a fair bit of kit. If he put a 15hp on it he'd be getting close to his car motorway speeds.

[Notebook]

Ha ha. Brilliant

[909]

Don't forget the sunglasses or your eyes will dry out.

I'd say get the biggest engine you can comfortably carry with one hand.

If your max is 57lbs or 26kg. Then just buy it. Don't think. Just buy it.

For me the sweet spot is about 80lbs or 36Kg. I can lift more, but it's no fun.

There's a saying : There's no replacement for displacement.

9.8 =10.3 cubic inches compared to a 15 = 15.6 cubic inches.

That's A LOT more torque. Don't forget the importance of torque.

People will always ask about your boat. Extra unexpected passengers. Ever struggle to get on plane?

You'll always see people selling smaller outboards to upgrade, and rarely see people downgrading unless they're retiring and getting older , but you're young and strong right ?

[Notebook]

Originally Posted by 909

Don't forget the sunglasses or your eyes will dry out.

I'd say get the biggest engine you can comfortably carry with one hand.

If your max is 57lbs or 26kg. Then just buy it. Don't think. Just buy it.

For me the sweet spot is about 80lbs or 36Kg. I can lift more, but it's no fun.

There's a saying : There's no replacement for displacement.

9.8 =10.3 cubic inches compared to a 15 = 15.6 cubic inches.

That's A LOT more torque. Don't forget the importance of torque.

People will always ask about your boat. Extra unexpected passengers. Ever struggle to get on plane?

You'll always see people selling smaller outboards to upgrade, and rarely see people downgrading unless they're retiring and getting older , but you're young and strong right ?

Not exactly. 57. Built like a brick shit house, but had appendicitis a few years ago and upon finding a hernia during it I was cut top to bottom.
Not sure if I had a mesh inserted etc but if I lift anything heavy I can feel the strain in my stomach, so I would have had a 4 stroke 15 but too heavy.
As for speed, I’m a 65mph motorway safety priority type of guy and therefore wouldn’t want to hammer it, but also living by the river usk and aware of its power, I wouldn’t want to be caught with my pants down is a fast moving tide.
I have seen boats appear to struggle at exmouth.
Mostly I think I would be going inland, say up the dart at Dartmouth etc to start with.
Hope that makes sense.
But yes, now you mention it there are always smaller obs on offer.

[chipko]

In fairness to the OP, despite previously going round and round in ever increasing circles both engine and boat wise, this is a fairly definite question;

“A new 26 kg four stroke from any major brand or a cheeky new 26kg Tohatsu 9.8 two stroke”

We know it’s going on an Elling KB350, we don’t know how lardy/how many crew aboard or speed aspirations the OP has in mind.

Lightly loaded one up (80kg helm, 12l fuel, plus anchor/basic safety kit) in good conditions then expect the four stroke 6hp to max out at around 13 knots and the 9.8 two stroke 18/19 knots. Both will get on the plane, albeit with the 6 taking considerably longer.

Two up (say 140kg, 12l fuel, anchor/basic safety kit etc) in good conditions it will be marginal if the 6hp gets planing. If it does expect around 11/12 knots, if not you’ll be stuck at displace speeds around 6/7 knots. By comparison the 9.8 two stroke will have no trouble planing and should still easily maintain around 17/18 knots. Two up the difference will be chalk and cheese.

If you can legally get your hands on one and don’t mind pre mixing oil/fuel then for the same weight the extra oomph of the 9.8 is hard to ignore.

[Notebook]

Looks like the 2 stroke is the winner.
Was born at 80kg.
Thanks again.
Off to look down the back of the sofa for some cash.