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Old 08 April 2004, 09:37   #1
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Max speed

Good afternoon all,
I am just sorting out my insurance and they want to know what the max speed will be. Can anyone help with that? I have a Tornado 5.3m with a 75HP marina outboard. I have had a look at previous posts but cant find my set up.Knots/mph

Many thanks,

Neal

p.s "Happy easter"
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Old 08 April 2004, 10:05   #2
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What is the prize?
I would guess 35 knots
Nick

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Old 08 April 2004, 10:45   #3
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Used to get 40 kts from my old Valiant 4.9m/ 75hp merc outboard, so I'll second that 35 kts as it's a slightly larger and heavier craft.You might get more if you trim out and lift the engine up a notch, but this may affect handling.
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Old 08 April 2004, 14:22   #4
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If unsure go high. If you quote something too small and you ever claim, you could put money on the insurance company saying it goes faster then you said and trying to wriggle out of the claim.

Not that I am a cynical old git!!!! Just seen the buggers in action before!

Also Mardon, my insurance company really doesnt care as they understand powerboats. Many insurance companies deal with yachts and as such fast yachts are much more of a risk than a fast powerboat. As their policies are generally the same, the question about speed is irrelevent for you but key if was a yacht. Thats what I was told anyway!!
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Old 08 April 2004, 15:03   #5
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I asked humber(in my case),they gave me a design speed of around 40 mph so this is what I quoted
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Old 08 April 2004, 15:40   #6
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Neal excuse the question but don't you know what the top speed of your boat is??

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Old 08 April 2004, 15:52   #7
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Manos, i'm guessing but, new member, 18 posts, therefore new RIB and has not got it insured yet so has not gone to sea in it???
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Old 08 April 2004, 16:17   #8
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Please excuse me, I know I'm not a ribber
When I was looking for insurance for my formula I spoke to a few co's at the boat show. Basically (And I am quoting here!) they think we all exagerrate about our boat's speed and think it's faster than it is.

However, if you know the boat's weight, can guess the hull form reasonably, and HP, it's pretty easy to make a good stab at the speed.
If it weighs 800kg (350kg hull, 100kg engine, 2 blokes @100kg each, 150kg for batteries, fuel, anchor and other kit) with 75hp flat out speed should 35 knots, maybe slightly more. It 'may' do 40 if you lose a good bit of weight from my sums and the hull is better than I've assumed, you tweak it for top speed, etc etc.

Often however the insurance co's say 'design speed' rather than top speed. So in that case whatever the manfr's tell you is safe.
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Old 09 April 2004, 04:29   #9
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Daniel you spot on this is my 1st RIB (its not new) and as you can see in profile it not been well and i have not had her out. Have been working on it during the winter last main job is new tubes and it going away for that next week (Hi Ed) so i felt time to insure as it will be away from home.
while i was about right with the speed just wanted to check (dont want problems later if i was wrong ).

Many thanks all and hope to meet up with some of you soon as she will be ready for summer

Have a good weekend.

Neal
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