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Old 26 October 2010, 08:25   #1
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Twin Engines

Hi,
How does twin engines work on the console?
Presumably you need 2 trim tabs, so you can raise and lower each engine independantly.

Do you also have 2 throttles, or just one throttle with 2 ignition keys/buttons/switches?

Yours,
Tom
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Old 26 October 2010, 08:36   #2
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On mine i have 2 of the quicksilver side mounted units so the same as single just with 2 of them, the simpler way.

There are lots of variations, but for most i guess you have to have 2 starting systems, 2 throttle systems and a way of using the trim tilt on each engine.
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Old 26 October 2010, 10:13   #3
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Quote:
Originally Posted by tompaddock View Post
Hi,
How does twin engines work on the console?
Presumably you need 2 trim tabs, so you can raise and lower each engine independantly.

Do you also have 2 throttles, or just one throttle with 2 ignition keys/buttons/switches?

Yours,
Tom
Two throttles, that way you can run one astern and one forward to turn on the spot. In fact, even with twin inboards, everything should be duplicated so you don't have a single point of failure, and can therefore get home on one if the other dies. The most vulnerable failure point would be a shared fuel source, obviously then contamination would affect both.

Mind you, with Castoldi jets we don't worry about things like trim tabs
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Old 26 October 2010, 10:14   #4
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Originally Posted by tompaddock View Post
Presumably you need 2 trim tabs
Hi Tom,

Trim tabs usually refers to horizontal fins, most larger engines offer a similar facility to "trim" by adjusting the angle of the motor.

And yes, as said, usually two separate systems - two keys, two sets of gauges and so forth.

In fact it is sometimes said that a twin engine installation that does not have total separation (battery and fuel for example) then the value of the double arrangement is much less, ie if one engine dies from a fuel problem and you only have one fuel tank then the 2nd is sure to follow!
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Old 26 October 2010, 10:15   #5
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Two throttles, that way you can run one astern and one forward to turn on the spot. In fact, even with twin inboards, everything should be duplicated so you don't have a single point of failure, and can therefore get home on one if the other dies. The most vulnerable failure point would be a shared fuel source, obviously then contamination would affect both.

Mind you, with Castoldi jets we don't worry about things like trim tabs
Does this apply even to outboards (RNLI Style)?
T
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Old 26 October 2010, 10:17   #6
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Trim tabs usually refers to horizontal fins, most larger engines offer a similar facility to "trim" by adjusting the angle of the motor.
This only applies to outboards.
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Old 26 October 2010, 10:19   #7
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This only applies to outboards.
Ah, fantastic, thanks.
I'd be interested to see how that works logistically, ie moving both throttles in tandem...
T
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Old 26 October 2010, 10:25   #8
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I'd be interested to see how that works logistically, ie moving both throttles in tandem...
The throttles are usually set up so they are very close and can be operated one-handed, it is not too hard to get them so that the same movement on each takes the engines up the rev range in parallel.
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Old 26 October 2010, 10:26   #9
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The throttles are usually set up so they are very close and can be operated one-handed, it is not too hard to get them so that the same movement on each takes the engines up the rev range in parallel.
Cool!
Would still like to play tho :P
Tom
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Old 26 October 2010, 10:29   #10
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Cool!
Would still like to play tho :P
Well it says in that box on the left that you have twin 115s
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Old 26 October 2010, 10:30   #11
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Well it says in that box on the left that you have twin 115s
Yeah, I'm a student.
The boat exists, but only in my head :P
Tom
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Old 26 October 2010, 10:36   #12
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Old 26 October 2010, 10:39   #13
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my comment exists, but i'm gonna keep it in my head
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Old 26 October 2010, 12:31   #14
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Thanks for that one, Wilk :P
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Old 26 October 2010, 12:54   #15
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Old 26 October 2010, 14:21   #16
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Old 26 October 2010, 16:00   #17
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That'll be the first time!! Come on, come on you know you want too!!
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Old 27 October 2010, 04:50   #18
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and if we're on the subject of cool stuff you can't afford, some of the really big "fly by wire" outboards will auto synch revs & trim so the subtle differences in lever / trim switch movement are ironed out.
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Old 27 October 2010, 05:09   #19
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and if we're on the subject of cool stuff you can't afford...
I have got an imaginary amphibious submarine, in red.
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Old 27 October 2010, 05:14   #20
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and if we're on the subject of cool stuff you can't afford
Keira Knightley
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