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Old 06 October 2010, 06:49   #1
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will my rib plain?

I am wondering if my valiant DR 490 will plain with 4 divers and a Cox. It is fitted with a 60hp etec and would be propped with a 17" by 13" ali prop. Fuel circa 30lt. Has anyone experance of this rib with such a load?

TSM
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Old 06 October 2010, 07:46   #2
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If it does, it deserves a medal
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Old 06 October 2010, 07:58   #3
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maybe if you filled the toobs with helium!

For what it's worth as a comparisson, Mine just got o nthe plane & stayed there 4 up with the old Yam 55 & a Std 14" prop.
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Old 06 October 2010, 07:58   #4
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I very much doubt it would be the plane and simple answer

Can you even fit 4 divers + 1 in a 4.9m?
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Old 06 October 2010, 09:18   #5
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I would think it would .... eventually. just don't expect to water-ski off it at the same time

I had a 5.5 humber with a 60 towing a 6.5m rib + 5 divers on the plane from Angle to Dale in Pembrokeshire took a while to get going, just inched the throttle up bit at a time, it was glass calm though.

They should have had 2 batteries or switched off all electrics off while they were at lunch :P
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Old 06 October 2010, 09:34   #6
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I think it will, my old tornado 4.8m with a 50hp Yam triple did. It was 6 up with 30L of fuel and some other junk on board. Just took a bit longer to get up there...
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Old 06 October 2010, 09:39   #7
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dont see why not, we regulary have 4 divers and a cox in a 5m humber with a 60 yam on the back we all have to sit forward to get her on the plane but she gets up easy.
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Old 06 October 2010, 10:32   #8
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Is the 17x13 the right prop for a more casual load? If so, then you might consider dropping a couple of inches when you go to the "need another boat" diving load. SHould help quite a bit with getting on plane, but you'll need to keep an eye on max rpm when you're cruising.

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Old 06 October 2010, 11:41   #9
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I used to have a 5.3 with a 60 Yam and regularly carried four divers with twinsets and kit plus 75lts of fuel at 24knots.
Can't think why anybody would think a smaller lighter boat wouldn't do just as well...
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Old 06 October 2010, 12:33   #10
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I'd better have a look through the medal drawer
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Old 06 October 2010, 14:04   #11
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My Tornado 5mtr will plane with 4 divers and is powered by an old smokey 60 merc. The prop pitch is a 13inch.

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Old 07 October 2010, 03:32   #12
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I usually use 19" prop for two up and 60 ltr of juice
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Old 07 October 2010, 04:22   #13
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My SR4.7 with DT65 suzuki would plane with 4 divers (max75kg) + 4xtwin tanks+ 45 liters of fuel. You would have to pack it right and place people quite much forward, and struggle a bit downwind.... but it worked.

it depends on the hull shape, and the size of your divers... i guess it becomes very sensitive to the weight and especially the distribution of this when you are a bit underpowered.
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Old 07 October 2010, 05:31   #14
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Mine had a 17" pitch prop all the time, empty or full of kit and worked fine. Never had any problem getting on the plane ever. Unless you could the time I stuffed it off Cape Wrath into a big wave when it was full of divers and filled it up to the top of the tubes with water? It did struggle a bit then
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Old 02 August 2011, 05:05   #15
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I tested this out over the weekend. The rib will plain with the equivent of 5 divers on board (assuming all in weight of the divers at 115 kg each) 50 lt of fuel, 10 lt of water and a 10 kg shot line. The rib feels very wallowy at this weight and ran much nicer wwhen the weight was reduced by 100 kgs. The prop was a 13 dia by 17 pitch. the WOT achived was 600 rpm (max for ETEC)

So my question has been answered

TSM
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Old 02 August 2011, 05:26   #16
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Hi TSM,

Do you know many divers? My experience of them is that they're quite a bit lardier than 115kg (incl kit)

My estimate:

Average (lol, no, SMALL) diver 80kg
Suit and small gear 10-15kg
Cylinder and Reg 19kg
Weight belt 13kg
Stab Jacket 5kg

(over 130kg)
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Old 02 August 2011, 05:59   #17
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I will only take the small ones. I was planning on 4 divers.

TSM
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Old 02 August 2011, 06:17   #18
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Quote:
Originally Posted by two stroke mick View Post
I will only take the small ones. I was planning on 4 divers.

TSM
A Guernsey dive team would be ideal then
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Old 03 August 2011, 14:30   #19
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It should be ok.
My old diving club had a 5.2 osprey with a 60 merc and it moved with 6 divers and 2 crew and yes it was a bit of a tight fit .
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