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Old 19 April 2004, 18:03   #11
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Quote:
Originally Posted by Robbie D
So I take it no alarm bells are going off with this setup John?
I agree with you that it sounds like it's going to be underpowered. However I haven't heard a bad word about these engines and from anecdotal evidence their performance appears to be impressive!

I'd definitely invest in that plane ticket though

John
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Old 19 April 2004, 18:16   #12
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Quote:
Originally Posted by Daniel
Don't suppose you have the cost and weight of both to hand anyone?
1.7 + Alpha drive, 300kgs

Prices vary. 7-10k
---------------------------
Yanmar 260 + Bravo 1, 488kgs

Prices vary.
----------------------------
Yanmar 315 + Bravo 1, 516kgs

Again prices vary, I was quoted about 14K.

-----------------------------------
Always a wealth of knowledge. I've voted for you

Ta.
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Old 19 April 2004, 19:11   #13
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Quote:
Originally Posted by John Kennett

I'd definitely invest in that plane ticket though

John
and make sure it's got a full load when you trial it, put sandbags on if you have to
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Old 20 April 2004, 02:01   #14
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I'll get the exact specs later this week, but as for the engine spacing the 1.7's will hardly be shoe-horned in. The beam on this puppy is 10' 4", with an engine compartment of about 8' across. The engines would be mounted approximately 38" apart on center. A rough estimate gives me about 13" of open space between the motors, so most maintenance can be done with motors in. (You old-timers still remember feet and inches, don't you?)
Without nitpicking, the exact weight of each motor w/ Alpha 1 is 296kg, and the width is 29" or 746mm.
Here's the spec .pdf file if anyone is interested:

http://www.cmdmarine.com/pdfs/18240303.pdf

Thanks for all the responses... keep 'em coming.

p.s. I'm not an engineer, but the torque curve on the spec sheet looks like it would slingshot any 7.5 meter RIB out of the hole with a twin setup, even with 15 pot-bellied tourists.
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Old 20 April 2004, 03:12   #15
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Glad you ran the numbers Robbie and it appears the 1.7's are the way to go
Solent ribs fit these in the 6m up to 7.5 range and they are very good
have not seen a twin set up using these yet but looking at the replies some members are in the process of doing it , as a matter of interest how far is the round trip for a typical charter.
regards tim
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Old 20 April 2004, 04:01   #16
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Quote:
Originally Posted by jwalker
1.7 + Alpha drive, 300kgs

Prices vary. 7-10k
---------------------------
Yanmar 260 + Bravo 1, 488kgs

Prices vary.
----------------------------
Yanmar 315 + Bravo 1, 516kgs

Again prices vary, I was quoted about 14K.

-----------------------------------
Keypart are currently offering the Mercruiser D1.7 (120hp) with an Alpha 1 drive etc for 6450.00.

4 Cylinder Yanmar on Bravo 1 10,600 available from most dealers at this price!
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Old 20 April 2004, 04:22   #17
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Quote:
Originally Posted by Daniel
...like you need to remove one to service it.
Hmm. This is a concept I'm rapidly becoming familiar with. I more or less have to pull an engine to change the spark plugs on the inboard pair of banks on mine. Having just pulled 1 engine, I've learnt it's not actually a big deal at all though.

This is where I would usually make some quip about mercruiser engines not needing servicing because they are disposable, but in the interest of protecting my rating, I won't.
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Old 20 April 2004, 04:23   #18
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Might be worth calling American Marine Imports up in the midlands - known the bloke for years - might be able to help? 01675 442647
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Old 20 April 2004, 06:10   #19
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Quote:
Originally Posted by Dirk Diggler
4 Cylinder Yanmar on Bravo 1 10,600 available from most dealers at this price!
B' hell, that's cheap. Perhaps they've been reading the other ribnet thread...or their customers have.
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Old 20 April 2004, 10:33   #20
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Quote:
Originally Posted by tim griffin
Glad you ran the numbers Robbie and it appears the 1.7's are the way to go
Solent ribs fit these in the 6m up to 7.5 range and they are very good
have not seen a twin set up using these yet but looking at the replies some members are in the process of doing it , as a matter of interest how far is the round trip for a typical charter.
regards tim
www.griffmarineservices.co.uk
Tim, the round is relatively short, about 8 to 10 NM depending on the route. Speed will vary a lot... cruise, slow moving around rock walls, and full stop for swim time. Might see some extra rpm if we spot a whale or dolphin pod. Unless it's a charter the average round will only be about 1:15 minutes.

One thing I find interesting in this thread is that I haven't seen the usual beef about 2 engines being purely for redundancy, as is the case for petrol outboards. Is it possible that this configuration might actually increase performance? Come to think of it, I think this was my original question for this thread...
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