How Fast Is Your Boat? - Page 8

codprawn · 12 September 2007, 15:08

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codprawn · 12 September 2007, 15:08

Quote:

Originally Posted by Tony

i have just under 50 knots in mine...but the question is ......from 40 to 50knots is a a hell of a difference, to me 40 is a great fast cruising speed with eyes wide open. surely 50 to 70 knots is just darn right scary? Can a rib handle that speed over average waters for a period of time?
Tony

That's pretty fast for a heavy boat with a deep v hull.

What prop are you using?

Tony · 12 September 2007, 15:38

Quote:

Originally Posted by codprawn

That's pretty fast for a heavy boat with a deep v hull.

What prop are you using?

Sorry Codders, I'm not very technical....Its a Mercury S/Steel HighFive

Tony

bedajim · 12 September 2007, 16:14

Quote:

Originally Posted by Tony

i have just under 50 knots in mine...but the question is ......from 40 to 50knots is a a hell of a difference, to me 40 is a great fast cruising speed with eyes wide open. surely 50 to 70 knots is just darn right scary? Can a rib handle that speed over average waters for a period of time?
Tony

38kts is great but I get a sharp stabbing pain down my left side at much over 40kts and a strange noise from the seat next to me

but she does help to launch etc

Tony · 12 September 2007, 16:18

Quote:

Originally Posted by bedajim

38kts is great but I get a sharp stabbing pain down my left side at much over 40kts and a strange noise from the seat next to me

but she does help to launch etc

LOL...
Its so so noisy I cant hear a thing..

codprawn · 12 September 2007, 19:44

Quote:

Originally Posted by Tony

Sorry Codders, I'm not very technical....Its a Mercury S/Steel HighFive

Tony

What pitch are you running? I have a 4 blade prop which is pretty good but seems to peter out at higher speeds - I thought more blades were better at lower speeds???

Tony · 12 September 2007, 20:09

Quote:

Originally Posted by codprawn

What pitch are you running? I have a 4 blade prop which is pretty good but seems to peter out at higher speeds - I thought more blades were better at lower speeds???

I'll take a look next time i am at the pontoon..

codprawn · 12 September 2007, 20:45

Quote:

Originally Posted by Tony

I'll take a look next time i am at the pontoon..

Thanks - the quest for the perfect prop continues!!!

Hugh Jardon · 12 September 2007, 21:11

Quote:

Originally Posted by Cookee

Our race RIB managed 84 mph the other day - anyone beat that?

7.4 metres Mercury 2.5 EFI (280 HP) 2 passengers (that's all it'll carry!) Tempest 23 slightly tweaked, modified gearbox, 15" offshore leg, over half fuel (at least 80 litres).

i have had mine at 85 a few times

does it need to be in the water to count?

Bigmuz7 · 12 September 2007, 21:13

Quote:

Originally Posted by codprawn

What pitch are you running? I have a 4 blade prop which is pretty good but seems to peter out at higher speeds - I thought more blades were better at lower speeds???

Thats been my finding ... when I went to a four from three, top end was not a lot different, all the benefit was at the bottom end, the four is a better prop IMO

Bigmuz7 · 12 September 2007, 21:23

Quote:

Originally Posted by Nick Hearne

Ask John Fuller on Botmad!

Nick

Oh please no ..... I think he's dissapeared back off to 'float bad' for a while, to annoy his own punters for a change.. anyway .. you'd want a valued opinion wouldnt you ?

Lostboy · 13 September 2007, 08:46

Just put a 19p stainless prop on mine and it's now a comfortable 45k boat. A bit of Solent tide got 47k on the GPS but to be fair this was then 44k on the way back.

Still pulls me out on the wakeboard comfortably as well

Cookee · 13 September 2007, 13:27

Quote:

Originally Posted by Hugh Jardon

i have had mine at 85 a few times

does it need to be in the water to count?

Yes!

Cookee · 13 September 2007, 13:29

Quote:

Originally Posted by Tony

i have just under 50 knots in mine...but the question is ......from 40 to 50knots is a a hell of a difference, to me 40 is a great fast cruising speed with eyes wide open. surely 50 to 70 knots is just darn right scary? Can a rib handle that speed over average waters for a period of time?
Tony

Actually we had one of our leisure boats do 64 mph with my inexperienced girlfriend driving it - 250 Verado, it does over 50 mph without any trouble at all unless it gets bumpy!

floater · 13 September 2007, 20:59

Zodiac Medline with 60 yam 4stroke
30knots flat out with 2 kids,wife, dog and the other crap you end up storing and taking out with you when you have big lockers !!!

but still had 20 knots with 9 in it (big teenagers)

Andy

Bigmuz7 · 13 September 2007, 23:05

Quote:

Originally Posted by floater

Zodiac Medline with 60 yam 4stroke
30knots flat out with 2 kids,wife, dog and the other crap you end up storing and taking out with you when you have big lockers !!!

but still had 20 knots with 9 in it (big teenagers)

Andy

begs the question, if you ejected the wife & big lockers .. and the dog, you might have gained 4 knots.... come on floater this about 'max' performance

Seaharrier · 14 September 2007, 13:57

Quote:

Originally Posted by Tony

Sorry Codders, I'm not very technical....Its a Mercury S/Steel HighFive

Tony

We are using the same one. On our boat, acceleration and planing speed became much better. Top-speed remained the same. 51,6kn

Nick Thomas · 15 September 2007, 07:37

Quote:

Originally Posted by Bigmuz7

begs the question, if you ejected the wife & big lockers .. and the dog, you might have gained 4 knots.... come on floater this about 'max' performance

Would the boat necessarily go faster if your wife doesn't have big lockers???

floater · 16 September 2007, 21:41

Quote:

Originally Posted by Nick Thomas

Would the boat necessarily go faster if your wife doesn't have big lockers???

dooohhh

the boat not the wife

christ she might read this Gulp !!