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Old 21 August 2014, 09:23   #1
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Biggest hand launch SIB

Hi chaps. I'm toying with the idea of getting a sib instead of an sr4. I understand the sr4 will be far better in chop etc but the advantages of sibs are really getting my attention. My question is it possible to have a good size sib say 4.2 with a 40hp on and still hand launch? Sometimes it would be trailer launched but I would like the versatility. Failing that it would be down to a 3.5 ish with a 25hp. Cheers guys
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Old 21 August 2014, 10:34   #2
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4.2 with a 40hp on it is going to be trailer territory, I would stick to the Sr4
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Old 21 August 2014, 10:39   #3
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Biggest hand launch SIB

Hi thanks nick. Yeah that's what I thought. That being the case I can't see any advantages to having a sib over 3.8m. Other than price. Maybe beaching? What sort of weight are we talking for say a 3.5 with Ali floor and 25hp?
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Old 21 August 2014, 10:41   #4
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A 4m SIB with a 25hp 2-stroke would be hand launchable with some decent transom wheels. If it was trailed to site then that would also avoid any lifting and carrying of the motor. Like Nick says though, anything with a 40 on it is going to be too heavy (unless you have half a rugby team standing by to assist!).

I like the idea of a small RIB that would mostly be trailed, but could also be hand launched with transom wheels. Something like a lightweight 4m aluminium RIB from Ribeye or Highfield might be the answer. I'd probably still want a 25hp 2-stroke though.
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Old 21 August 2014, 10:45   #5
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By "hand launched", I assume you mean with the boat on dolly with floatation tires. In that case yes.

If you mean simply with a couple of transom mounted launching wheels with turf tires, then maybe. In this scenario, you would want to have 2 people launching (1 on each side near the bow). If launching this way, do the following to avoid causing damage to the boat hull (especially if it is not a commercial grade SIB).

Run a 2-3" wide webbing strap under the bow and have the launchers hold the strap rather than the top sponson rope directly. Feed the strap between the top grab rope and the sponson on each side near the front to keep the strap from slipping forward.
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Old 21 August 2014, 10:52   #6
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Biggest hand launch SIB

3.5 ally floor sib around 65kg
25hp 2 stroke - 51kg Tohatsu
25hp 4 stroke - 62kg Suzuki to over 70kg
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Old 21 August 2014, 11:02   #7
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Biggest hand launch SIB

Ok I'm pretty confused now. I would always be out with a mate & we could easily carry a 40hp (75kg?) between us but going off the spec above I would estimate a 4.2 sib to weigh around 75kg. That's still movable with two by my reckoning but easier said than done on a sandy / shingle beach I bet. I'm not questioning anyone's comments I'm just trying to get my head around it.
That said is it worth the hassle. Should my options be more clear cut to either sr4 and stick to slipways or 3.5 25hp sib?
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Old 21 August 2014, 11:04   #8
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I've just realised that what I'm implying is putting the engine on the transom in the water. Not good!!!
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Old 21 August 2014, 11:27   #9
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You are misundersatnding the nature of the weight. Picking 75kg up between 2 people is possible, picking a 75kg sib up isnt.

The problem is balance and hand holds, a sib just doesnt like being carried by 2 people, much easier with 3.

Myself and teenage son can hand launch a 4.7m sib with a 25hp 2 stroke using Zodiac launch wheels over good ground if the gradients are not too steep.
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Old 21 August 2014, 11:29   #10
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No yeah I get that. Big clumsy things are much more difficult. Even disregarding a coastal breeze!
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