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Old 17 September 2005, 13:59   #11
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Quote:
Originally Posted by simmons0
With our Merc 1.7 we get 40 knots flat out and cruise it around 28knots, Mike, its 116hp at the prop and a bit over 120 at the crank.
Seriously, is that from the GPS or a paddle wheel 'speedo'? I can get nearly that on the paddle wheel... with the boat on the plane and the paddle wheel spinning half out of the water.

My Humber is a fairly heavy boat so I'm sure a faster design would get a few more knots.... flatter hull, higher plane position etc but an extra 10? I keep hearing these great figures for the Merc 1.7 but I've never seen it. The speed I quoted is the average reading I get, depending on current and tide obviously.

So how did you measure it?

Mike C
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Old 17 September 2005, 14:50   #12
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Parker

6.3m with the mercruiser 1.7

Since I fitted trim tabs (and cleaned the tubes) about 34-35kts top and cruise at about 28kts I think Andre got about the same

Ian
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Old 17 September 2005, 15:52   #13
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Simmoms0 has a Solent 6 mtr much lighter then Mike's Humber 630 and Ian's Parker 630 hence I guess better top speed.

I recently tested the Parker 750RS fitted with the Cummins Mercruiser 4.2 (320HP) linked to the B3 drive. Top speed on a lake 46 knots. With diesel you can enjoy speed. This is my rib for 2006
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Old 17 September 2005, 19:46   #14
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Quote:
Originally Posted by The Garfish
fuk mee simmuns1 i fink yew mus av a derty bottum de waiy yorr bote iz lewzin spead

gArf
Yeah thats how it went GaRf, the day we got it the max speed on kevin's hh gps (with him driving) said 47.7 knots, havent seen that since, but it will do 40knots gps speed.

Mike, 40 knots is an average top speed, it's done 43knots with 1 person and maybe some tide but if i took you out for a spin i could guarantee you'd see 39knots and it should touch 40.
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Old 17 September 2005, 19:54   #15
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Quote:
Originally Posted by simmons0
Yeah thats how it went GaRf, the day we got it the max speed on kevin's hh gps (with him driving) said 47.7 knots, havent seen that since, but it will do 40knots gps speed.

Mike, 40 knots is an average top speed, it's done 43knots with 1 person and maybe some tide but if i took you out for a spin i could guarantee you'd see 39knots and it should touch 40.
Or he will read 49,9 knoths to beat all others......

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Old 17 September 2005, 19:57   #16
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I may be able to add something to this as finally the Blue Arctic RIB are finally due to be out of customs bond on Monday and that one is powered by 320 hp Cummins/Mercruiser diesel and I and my colleage will have a ride on Monday or Tuesday pending on when put on water ... somebody have to do the warranty work

Bogi (warranty inspector )
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Old 18 September 2005, 05:26   #17
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Quote:
Originally Posted by simmons0
Mike, 40 knots is an average top speed, it's done 43knots with 1 person and maybe some tide but if i took you out for a spin i could guarantee you'd see 39knots and it should touch 40.
OK, may take you up on that one day! Is your's the 6.0 or the 6.5? I've just had a look at the 6.0 and with the extra tube length, (Humber's tube extension at the stern is very short - so more hull for given LOA), I would guess I had getting on for half a metre more hull than that one. That may be the extra weight... or maybe mine is just a heavier lay-up? I know my boat and Andre's original Seahawk did about the same top speed. Well, he just pulled away from me but he again had slightly less hull and a S/S prop.

What prop are you running, (and pitch). I'd be interested to know. (Aren't Solent Ribs, Lee Fairweather's baby? I know he did a lot of speed work on the Merc 1.7 when it came out.... and he won't use S/S on the Alpha One leg. Maybe he has the secret... Eh Lee?)

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Old 18 September 2005, 06:08   #18
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Funny. The fastest I ever got Farfetched, well actually second fastest but that second one was with a real tidal run, was with Kev from Solent on her maiden test run. We were parallel to the shore on the Western approach to Portsmouth going NE. Is there a strong helpful run there? Is that Kev' s little secret???

I get 42 with full fuel 4 passengers, no probs. Have seen 46.7 with two up and half tank. These on GPS averaging two runs in both directions (48.7 one way and 44.7 other).

Incidentally, fuel has settled down to 1.1/1.2 l / Nm, about 15 litres an hour, 2 stroke oil consumption very modest. Range (safe) is about 100Nm on the 160l tank - usable about 135 I reckon.
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Old 18 September 2005, 09:06   #19
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Ours is a 6m, and yer, Lee has always told us not to bother with a stainless prop, because we were keen to try one.
At the moment its a 23p Ali prop, but its slightly worse for wear hence the drop in speed from just over 40knots to just under.

We fitted some doelfins a few weeks ago too, worked wonders. Flies more level now, quicker onto the plane, more responsive to the trim, cavitates less, no drop in speed at all.
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Old 18 September 2005, 09:14   #20
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Quote:
Originally Posted by simmons0
We fitted some doelfins a few weeks ago too, worked wonders. Flies more level now, quicker onto the plane, more responsive to the trim, cavitates less, no drop in speed at all.
I have never seen Mercruiser with doelfins do you have pictures ?, I can lent you a SS prop to try out if you want, can bring it over soon as I need to have a look at my new boat shortly not that far from Kenilworth.

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