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Old 13 September 2005, 08:09   #1
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Is this enough power?

Afternoon all!

I'm looking around for Galaxsea 3 at present.

I've just seen a Ribeye 785 with a Mercury 150 XL Optimax in the back.

Is this enough power to give a decent performance and a bit of fuel ecconomy on a longer run?

Any advice and guidance gratefully recieved!

Cheers
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Old 13 September 2005, 08:18   #2
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Quote:
Originally Posted by Phil Chitty
Afternoon all!

I'm looking around for Galaxsea 3 at present.

I've just seen a Ribeye 785 with a Mercury 150 XL Optimax in the back.

Is this enough power to give a decent performance and a bit of fuel ecconomy on a longer run?

Any advice and guidance gratefully recieved!

Cheers
Hi Phil

That is just about an 8 mtr rib and a 150HP motor is going to be the very very minimum you should even consider
Just think of my 750RS with the Verado 225HP , you will not get that kind of accelaration and top speed with the 150HP

I thought you wanted to go diesel
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Old 13 September 2005, 08:33   #3
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Ha ha

I had a feeling if you were on you'd try to keep working on me!

I thought it might be a little low on the power front.

Gliddon Marine are quoting 45 knots.
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Old 13 September 2005, 08:48   #4
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Quote:
Originally Posted by Phil Chitty
Ha ha

I had a feeling if you were on you'd try to keep working on me!

I thought it might be a little low on the power front.

Gliddon Marine are quoting 45 knots.
Did I say a Parker diesel

perhaps I was thinking of such

Pontoontalk are off to the SBS on Sunday . Are you going?
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Old 13 September 2005, 08:55   #5
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Quote:
Originally Posted by Phil Chitty
Ha ha

I had a feeling if you were on you'd try to keep working on me!

I thought it might be a little low on the power front.

Gliddon Marine are quoting 45 knots.

Thats presumably when going with a 10kt tide?!

An almost 8m RIB with a 50opti is going to do 35kts tops I'd say. For comparison my 6.5M DS21 did 40ish with 150 and my 7.8m Scorpion did 45kts tops with 200.
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Old 13 September 2005, 09:00   #6
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Quote:
Originally Posted by Andre
Did I say a Parker diesel

perhaps I was thinking of such

Pontoontalk are off to the SBS on Sunday . Are you going?

I'm still working on the house this weekend mate. I've lived in a house less than 10 minutes walk from my RIB for 6 weeks now and I've only used it twice!

That has to change!

I'm off to SBS on Monday with a few others.

Gonna get me a Gekko!

Cheers for the info Alan.
I thought it might be a bit underpowered for its size.
I've not seen a 785 with less than 200hp before.
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Old 13 September 2005, 10:39   #7
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Sounds a little underpowered to me. Engine could be thirsty as working hard.
I have an opti 225 and get to about 38Kts flat out... although she is a pretty solid boat.
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Old 13 September 2005, 10:45   #8
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Quote:
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Sounds a little underpowered to me. Engine could be thirsty as working hard.
I have an opti 225 and get to about 38Kts flat out... although she is a pretty solid boat.
What kinda hull matey? What revs do you pull at WOT with yer Opti?
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Old 13 September 2005, 11:01   #9
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I'd say 150 is well under powered. My hull is a tad shorter at 7.5m, but the 225 gives it fab performabce.

Having said that a cuople of similar boats I know have 200's and they're quick.

I would suggest on this rib 200 would be minimum for decent performance.
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Old 13 September 2005, 12:42   #10
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Notice you mentioned low on power front you would be better having the deisel instead of a 150 on that size boat i have new 150 2 stroke fict goes great but would with 785 rib
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Old 13 September 2005, 12:42   #11
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Notice you mentioned low on power front you would be better having the deisel instead of a 150 on that size boat i have new 150 2 stroke fict goes great but would with 785 rib ?
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Old 13 September 2005, 12:42   #12
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Notice you mentioned low on power front you would be better having the deisel instead of a 150 on that size boat i have new 150 2 stroke fict goes great but would with 785 rib ?
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Old 13 September 2005, 16:26   #13
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ask simon for a test drive and find out for yourself
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Old 14 September 2005, 02:22   #14
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Quote:
Originally Posted by paul tilley
ask simon for a test drive and find out for yourself

Good advice Paul.
That would be the best way to really find out.

Thanks for everyone's advice on this.

Phil
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Old 14 September 2005, 03:39   #15
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Just to add my bit, My 6.5 Vipermax is nice with the 150 Opti, but I wouldn't want to go any smaller. Again, a lot of it comes down to props. I run a 19P which gives 42knts and an instant pull out. I'm looking at also having a 21P for cruising. Personally I would find a 150 on a 7.85m rib a bit under powered. In order to acheive 45knts you'd have to run a 22P or poss 23P prop. It would, I guess, then stuggle to get onto the plane with a few people onboard. But, as mentioned, give it a run. Maybe with a couple of mates onboard.
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Old 14 September 2005, 04:06   #16
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Pontoontalk are off to the SBS on Sunday . Are you going?
I hope you're going to come and see us on the Try a Boat stand!
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Old 14 September 2005, 04:07   #17
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Can anyone give a props for dummies guide...

Obviously speed looses acceleration power. However, does the steeper prop give better cruising efficiency once on the place? Does it greatly effect troll speed and how about load on the engine? As before my opti revs to max of 5200.

Thanks



Quote:
Originally Posted by Mollulnan
Just to add my bit, My 6.5 Vipermax is nice with the 150 Opti, but I wouldn't want to go any smaller. Again, a lot of it comes down to props. I run a 19P which gives 42knts and an instant pull out. I'm looking at also having a 21P for cruising. Personally I would find a 150 on a 7.85m rib a bit under powered. In order to acheive 45knts you'd have to run a 22P or poss 23P prop. It would, I guess, then stuggle to get onto the plane with a few people onboard. But, as mentioned, give it a run. Maybe with a couple of mates onboard.
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Old 14 September 2005, 04:12   #18
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Quote:
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Can anyone give a props for dummies guide...
Have a look here.

HTH
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Old 14 September 2005, 04:25   #19
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thanks!
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Old 14 September 2005, 14:17   #20
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Quote:
Originally Posted by Cookee
I hope you're going to come and see us on the Try a Boat stand!
Cookee, thanks for the invite , lookout for the Pontoontalk T-shirts
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