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Old 18 February 2006, 13:13   #11
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Country: UK - Wales
Town: Southampton
Boat name: DynaMoHumm/ SRV/deja
Make: Avon8.4, 5.4 & 4.777
Length: 8m +
Engine: Cat3126 Yam 90 &70
MMSI: 42
Join Date: Dec 2003
Posts: 6,556
Quote:
Originally Posted by DJL
I would definitely go for the 4-stroke. 2-stroke technology in the range around 60HP is still pretty basic.

You can expect to get around 30-40% better fuel economy with a 4-stroke depending on how hard you push the engine (assuming a carb 2-stroke not an Evinrude Etec, Nissan TLDI etc). Performance will be pretty similar between the two.
Never trust a teenage mechanic! doesn't most 4 strokes carry a weight hendicap, have the 4 strokes got the low down grunt of a 2 stroke.

I've just been out on a 5 metre with a 75 hp 4 stroke and I am realy disapointed with its lack of snap. It's quiet though and frugal.

I note you are from Southampton. I have a Gemini 5 m with a Merc 75 4 stroke and an Avon 5.4 with a 70 Tohatsu.

neither are for sale but you are welcome to try em both out and see what you think! ( you pay for the fuel)

of the two boats I'd go for the Ribcraft this craft had a very good record in the old RB4 challenge
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Old 18 February 2006, 13:21   #12
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Country: UK - England
Town: Southampton
Boat name: Jaws
Make: Gemini 4.2
Length: 4m +
Engine: Tohatsu 50hp
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Join Date: Feb 2006
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Cheers for the offer of trying them. Ive was reading another thread and am i right in thinking its your place this side of Northam Bridge?
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Old 18 February 2006, 13:27   #13
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Country: UK - Wales
Town: Southampton
Boat name: DynaMoHumm/ SRV/deja
Make: Avon8.4, 5.4 & 4.777
Length: 8m +
Engine: Cat3126 Yam 90 &70
MMSI: 42
Join Date: Dec 2003
Posts: 6,556
now that depends on where you are. We are part of the boatyard that is at the Northam end of Northam bridge next to Coalporters rowing club.
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Old 18 February 2006, 13:29   #14
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Country: UK - England
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Boat name: Jaws
Make: Gemini 4.2
Length: 4m +
Engine: Tohatsu 50hp
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yep the stadium end, what do you charge for storage...actually...will you be around anytime tomorrow?
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Old 18 February 2006, 13:35   #15
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Country: UK - Wales
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Boat name: DynaMoHumm/ SRV/deja
Make: Avon8.4, 5.4 & 4.777
Length: 8m +
Engine: Cat3126 Yam 90 &70
MMSI: 42
Join Date: Dec 2003
Posts: 6,556
Yep i'll be there from 09:00 hours and we are very reasonable. It's the first unit in the boat yard. There is a Landy 110 and a fork lift just outside
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Old 18 February 2006, 13:38   #16
DJL
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Make: Ribcraft 6.5
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Quote:
Originally Posted by Rogue Wave
Never trust a teenage mechanic! doesn't most 4 strokes carry a weight hendicap, have the 4 strokes got the low down grunt of a 2 stroke.

I've just been out on a 5 metre with a 75 hp 4 stroke and I am realy disapointed with its lack of snap. It's quiet though and frugal.
Actually Mr Wave I had the pleasure of upgrading the engine on my 4.7m RIB from a Mercury 60HP 2-stroke to a Mercury 60HP EFI 4-stroke (10kg difference in weight). In my case I saw fuel consumption improve by 30-40%, pretty much what they state in the literature. Furthermore, performance wise they were pretty much identical, in my case i gained a few knots on top end speed with the 4/.

I suspect the poor performance you experienced with the 75HP 4/ was due to its horrible power-to-weight ratio (same block as the 90 and 115) and its lack of fuel injection.
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Old 18 February 2006, 13:41   #17
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Country: UK - England
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ok cheers, i'm going to try and come round about lunchtime.
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Old 18 February 2006, 13:54   #18
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Country: UK - Wales
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Boat name: DynaMoHumm/ SRV/deja
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Length: 8m +
Engine: Cat3126 Yam 90 &70
MMSI: 42
Join Date: Dec 2003
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Quote:
Originally Posted by DJL
Actually Mr Wave I had the pleasure of upgrading the engine on my 4.7m RIB from a Mercury 60HP 2-stroke to a Mercury 60HP EFI 4-stroke (10kg difference in weight). In my case I saw fuel consumption improve by 30-40%, pretty much what they state in the literature. Furthermore, performance wise they were pretty much identical, in my case i gained a few knots on top end speed with the 4/.

I suspect the poor performance you experienced with the 75HP 4/ was due to its horrible power-to-weight ratio (same block as the 90 and 115) and its lack of fuel injection.
How can you put pleasure and 4 stroke in the same sentence!
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Old 18 February 2006, 16:29   #19
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Quote:
Originally Posted by Rogue Wave
I've just been out on a 5 metre with a 75 hp 4 stroke and I am realy disapointed with its lack of snap. It's quiet though and frugal.
I thought she was pretty nippy actually, obviously not a 2 stroke levels, but fairly brisk all the same.

Quote:
Originally Posted by Rogue Wave
I have a Gemini 5 m with a Merc 75 4 stroke and an Avon 5.4 with a 70 Tohatsu.
No you don't, you have a Gemini 5.5m with a Mariner 75 4 Stroke, and an avon 5.4 with a 90 tohatsu.

Quote:
Originally Posted by golfbravo06
Jimbo do you know what year the uni's boat was made and how well are the tubes etc fairing up to being used by a university, Soton Institutes boat always seemed to look fairly worn out. Thanks for the offer by the way ill pm you about it.
Golf Bravo - yes, she was made in 2005, as I ordered her! She has thus far proved excellent - she still looks brand new after 60 hours since August.

Look forward to your pm.
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Old 18 February 2006, 16:38   #20
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Country: UK - Wales
Town: Southampton
Boat name: DynaMoHumm/ SRV/deja
Make: Avon8.4, 5.4 & 4.777
Length: 8m +
Engine: Cat3126 Yam 90 &70
MMSI: 42
Join Date: Dec 2003
Posts: 6,556
Quote:
Originally Posted by Jimbo

No you don't, you have a Gemini 5.5m with a Mariner 75 4 Stroke, and an avon 5.4 with a 90 tohatsu.
oh yes! you are correct oh windy one.

To tell the truth there were 5 adults on the boat at the time, and yeah she's not bad for a four stroke, but I like 2 strokes and I thought it would be fun to give DJL a prod. (who is one stoodent I have a lot of time for!).
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