Two motors or One?

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Hugz
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Two motors or One?

Postby Hugz » Fri Mar 14, 2014 8:07 am

I'm thinking two long shaft motors as she has a fairly deep transom. The second motor mainly for reliability and at the times when there is a bit of a windage problem.

QM2 Stern.JPG


Going to have to raise the bridge a tad if going upstream.

QM2 harbour bridge.JPG


Taken from the Opera house. She is rather large. Apparently contains a shopping centre!

QM2 Opera House.JPG
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Last edited by Hugz on Fri Mar 14, 2014 8:46 am, edited 1 time in total.

THCL500J8
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Re: Two motors or One?

Postby THCL500J8 » Fri Mar 14, 2014 8:20 am

Mate i had a look at her when she was in Brisbane, your going to need a couple of 102plus long shafts, and a couple of extra long range tanks.
Yes there is a shopping center, and yes the Misses did buy something.
TC - 1960 LLS - 1961 LLS - 1966 THCL - 1968 EFNRL - 1986

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Hugz
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Re: Two motors or One?

Postby Hugz » Fri Mar 14, 2014 8:58 am

She is leaving Sydney at 9pm tonight heading for Brisso. Probably best to keep the Missus at home this weekend..... What did she buy? I'm guessing they don't have a Seagull spares shop onboard. :D

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skyetoyman
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Re: Two motors or One?

Postby skyetoyman » Fri Mar 14, 2014 9:32 am

Bit of a bugger to change a prop shaft spring though.
LLS c 1961 on a crescent 42 boat c 1980 + wspcl c 1976 + 102 SD8561 c 1944 + 102 ACR 1948

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Hugz
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Re: Two motors or One?

Postby Hugz » Sun Mar 16, 2014 3:21 am

Yep, that it would be, probably get a sore back starting them too.

She is in Brisbane now and then at Yorkey's Knob. Thats got be in Queensland :?

THCL500J8
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Re: Two motors or One?

Postby THCL500J8 » Sun Mar 16, 2014 8:00 am

Yep, its a suburb just north of Cairns. its were the P&O terminal is. 10 or 15 km North.
TC - 1960 LLS - 1961 LLS - 1966 THCL - 1968 EFNRL - 1986

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Robin Anderson
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Re: Two motors or One?

Postby Robin Anderson » Thu Mar 20, 2014 12:22 am

Two engines definitely the way to go for reliability but I would recommend just one longshaft centrally mounted with the other engine being a short shaft mounted slightly off the centre line on a swing down bracket. The fact is that you would not need to run both engines at the same time - ample thrust from just one, providing it has the large 5 bladed 11""diameter Hydrofan. Running both engines at the same time would just cause too much noise (passengers may complain) and double running costs. The swing down bracket is the one to use when operating the craft in shallow water because it will lift up should you hit the bottom with the skeg, thus avoiding potentially expensive damage to a fixed transom mount. Should be able to reach hull speed in a few years, given a fair wind and tide :x
Robin.
"Pleiades of Birdham"
MXWQ5

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Hugz
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Re: Two motors or One?

Postby Hugz » Thu Mar 20, 2014 12:45 am

Indeed! Some care might be needed with some rubber dampening on the swing down bracket. I would have no wish to subject the passengers to any vibrational discomfort. Stirred but not shaken should be the motto here.

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1650bullet
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Re: Two motors or One?

Postby 1650bullet » Thu Mar 20, 2014 10:15 pm

Don't forget the 10-1 fuel--oil ratio. I would go for a F N R as well for something that big

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Hugz
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Re: Two motors or One?

Postby Hugz » Thu Mar 20, 2014 11:40 pm

Yep, 10 to 1 it is, bio-degradable of course. I note there are a lot of ports either side so plenty of room for pairs of sweeps for stopping and reverse. They do have a galley class I presume?

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Rob Ripley
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Re: Two motors or One?

Postby Rob Ripley » Sat Mar 22, 2014 11:01 am

I was fascinated watching a cruise liner spin (bow and stern thrusters and twin drive pods) in its own length in Milford Sound, all the while showing the forward view on the wide screen.
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CatiGull
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Re: Two motors or One?

Postby CatiGull » Sun Apr 13, 2014 12:30 pm

1650bullet wrote:Don't forget the 10-1 fuel--oil ratio. I would go for a F N R as well for something that big



R is made redundant by efficient boat handling, surely.
Stephen
Awenke Yacht Club
New Baltimore NY
S/V Catigale
Macgregor 26X
Island 17 Sloop

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Robin Anderson
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Re: Two motors or One?

Postby Robin Anderson » Sun Apr 13, 2014 10:04 pm

CatiGull wrote:
1650bullet wrote:Don't forget the 10-1 fuel--oil ratio. I would go for a F N R as well for something that big



R is made redundant by efficient boat handling, surely.


Exactly Catigull, it would also confuse the passengers if the vessel started going astern, they would all be facing the wrong way, some of em might be quite elderly and the scenery rushing past backwards could unsettle them.
Robin
"Pleiades of Birdham"

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Rob Ripley
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Re: Two motors or One?

Postby Rob Ripley » Mon Apr 14, 2014 12:41 am

I suppose it was a bit confusing for a few, but after a Piña Colada (or two) who could tell where anything was going !

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Rob Ripley
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Re: Two motors or One?

Postby Rob Ripley » Mon Apr 14, 2014 12:46 am

One plus of putting a Seagull together from a box of parts is that the tiller can now turn almost 90 degrees to the transom - my boat can now spin in her own length .... works well with a 40+, the C100 just cavitates !


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