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Old 26-12-2011, 15:10   #1
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Tender max outboard - oversizing?

I have a wetline 265 airdeck tender, the design plate says max payload 500kg and max engine as 8hp. Now what would be the likely result of sticking a 15hp (2 stroke though so 34kg) outboard on the back? will it rip the transom off or?

An 8hp four stroke is certainly heavier than the 15hp 2 stroke, so i don't think the weight on the transom will be the issue.
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Old 26-12-2011, 15:11   #2
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Re: Tender max outboard - oversizing?

meant to add the specs

  • GRP laminated transom - for maintenance free long life
  • Davit lifting points - for easy stowage
  • Outboard tank strap - for safe operation
  • Heavy duty rubbing strake - shrugs of knocks and scrapes
  • GRP laminate seat - non-slip for extra safety
  • Bow ring, towing eyes and lifeline included
  • Oars, oarlocks, pump and repair kit includedĚ_
  • Air Deck floor design has a 'V' floor profile adding performance to the hull
  • Removable Air Deck floor enabling compact and easy stowage when not in use.
  • Dimensions: Overall Length: - Outside: 273cm - Inside: 165cm Overall Width: - Outside: 154cm - Inside: 65cm Tube Diameter: 43.5cm
  • Weights: People: 3.5 (assumed at 75kg per person)
  • Maximum payload: 550kg (the maximum payload includes provision and personal effects, fuel, liquids and any equipment not included in the weight of the unladen craft)
  • Materials: Tube material: PVC 1100 Dtex 750grams Tube number: 3 sealed and 2 in floor Tube valve: Halkey Roberts
  • Outboard Data: Maximum recommended power: 8hp / 6kw Maximum weight of outboard: 55kg
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Old 26-12-2011, 15:13   #3
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Re: Tender max outboard - oversizing?

In some areas, it may be a violation to put a larger than recommended O/B on a vessel
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Old 26-12-2011, 15:16   #4
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Re: Tender max outboard - oversizing?

If lighter outboard i could not see an issue although it would be a warranty issue.

In real world if you respect and don't have to use all available power of outboard you already have, why not!
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Old 26-12-2011, 15:19   #5
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Re: Tender max outboard - oversizing?

We have a 15hp 2 stroke on our 10' Avon.
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Old 26-12-2011, 15:24   #6
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Re: Tender max outboard - oversizing?

I currently have a little 4hp four stroke, which will plane with just one on board, no chance with 2, got offered a mint 15hp 2 stroke for a decent price, at 34kg its just in the man handleable range, i reckon a 8hp will plane with 2 and a bit of persuasion.

I also like the idea of being able to get back to the boat quickly (assuming two on board and not being stuck at 5-6mph non planing speed) in case of emergency/bad weather, i also like the idea that should i have engine failure , i could perhaps manhandle the yacht using the tender or somehow jury rig the 15hp on the transom (maybe fix onto the swim ladder)
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Old 26-12-2011, 15:25   #7
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Re: Tender max outboard - oversizing?

seahunter, can you tell me what sort of speeds you get out of it and will it plane with3 on board?
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Old 26-12-2011, 16:00   #8
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Re: Tender max outboard - oversizing?

i have a 25 on my fiberglass bottom rib,that is 3.2m and is rated for a 20hp,one of the problems is the actual weight of the rib,its too light,so with only one person on it the tendancy is for it to flip in any sort of a wind,also with out the motor leg in its fully fwd position it is also hard to get on the plane solo otherwise.

normally an 8hp should be okay for a 10 ft soft bottom,to plane,will probably carry a 15 but you may have issues with the inflatable keel/floor,the 10 ft avon has wood panels and keel so much heavier in the bow and rigid.

an 8 hp is
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Old 26-12-2011, 16:14   #9
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Re: Tender max outboard - oversizing?

We have a Achilles LSI 260 (air floor, 8.5 ft long). The boat is rated for 6 HP and for months I've been obsessed with finding a new outboard with 6-8 HP that didn't weight 80 lbs. In the end we tuned up (new coils, plug and well cleaned carb) our 5 hp 2 stroke Nissan and fitted the lowest pitch prop available (two steps below stock). I'm now able to get two of us and the dog on a plane pretty consistently. I like the idea of keeping everything as lightweight as possible.
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Old 26-12-2011, 16:17   #10
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Re: Tender max outboard - oversizing?

I have one of those tiller extenders, i'm about 100KG myself (all muscle - honest, ok a fair percent muscle and some love handles), if i go way forward it will plain with the little 4hp, though only about 11mph.

The way i'm thinking is that i will probably upgrade to a small rib later on , but i may as well use the inflatable till its dud, so i am trying to outguess my future needs and fit them in with today as well.
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Old 26-12-2011, 16:24   #11
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Re: Tender max outboard - oversizing?

Quote:
Originally Posted by stevensuf View Post
I have a wetline 265 airdeck tender, the design plate says max payload 500kg and max engine as 8hp. Now what would be the likely result of sticking a 15hp (2 stroke though so 34kg) outboard on the back? will it rip the transom off or?

An 8hp four stroke is certainly heavier than the 15hp 2 stroke, so i don't think the weight on the transom will be the issue.

You don't have to use all the power in the motor ...
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Old 26-12-2011, 16:35   #12
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Re: Tender max outboard - oversizing?

I don't intend to, but being human i know ill have to try it at some point
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Old 26-12-2011, 17:19   #13
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Re: Tender max outboard - oversizing?

Quote:
Originally Posted by stevensuf View Post
I don't intend to, but being human i know ill have to try it at some point

My outboard is *slightly* overpowered for my dinghy, and all I can say is ...

do it gradually.
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Old 26-12-2011, 18:15   #14
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I put a 5hp on our dinghy (9' alloy) which would be rated for 6 hp max.

A little while ago, on a little trip across the bay, while fiddling with the tiller extension I inadvertently put it hard over.

That little boat started spinning round in circles. It took an eternity to get my balance back and to straighten the tiller.

My senior crew is still with me, but she's never been keen on having the outboard on the dinghy ever since.

If I'd had a 15, or even a 9.8 I might not be with us now, or at the very least I'd be cruising alone.
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Old 26-12-2011, 18:20   #15
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Re: Tender max outboard - oversizing?

I had a 15 hp Yamamha on a 9 ft RIB after I had to buy the new dingy in the caribe. worked fine but much more squirrely than the 10 ft RIB.
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