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Old 10-21-2017, 01:45 PM   #1
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Grand Banks 36 single or twin?

Hello fellow mariner!
I am seriously In the market for a 36 Grand Banks. I like many of the advantages of the single engine but need to know the actual differances in fuel consumption. Cruise speed and max speed.
Thank you in advance!
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Old 10-21-2017, 02:13 PM   #2
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You’ll get a lot of answers and opinions here. Also join, search archives, and inquire on the Grand Banks Owner's Resources forum.

You’ll soon discover that the cost of fuel is one of your least you’ll have during boat ownership. You’ll have to decide whether you want two engines or one based on other criteria and needs/desires. Good luck!

Edit: BTW, welcome to Trawler Forum!
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Old 10-21-2017, 02:22 PM   #3
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I like twins but in this boat I’d go single because of weight and some other considerations. Singles are hard to find though.
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Old 10-21-2017, 02:25 PM   #4
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Giggitoni is correct. Forget about fuel consumption differences between a single and twins. It is 5-10% more for the twin: two engines to turn over so more parasitic losses and two rudders and struts so more drag.

You either want a twin or you don't for other reasons than fuel economy.

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Old 10-21-2017, 03:20 PM   #5
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Almost two tons extra weight for the twin. Weight is almost 100% proportional to drag so there may be more than 5-10% more fuel consumption but probably not much more .. 10 - 15%?
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Old 10-21-2017, 06:47 PM   #6
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You have a formula for displacement vessels that covers weight and drag?

I highly doubt it is anything above a few percent, not arithmetic.
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Old 10-21-2017, 07:20 PM   #7
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Fuel use is not the decider. There are many threads covering "twins vs single" on TF. Issues include maintenance(incl ease/cost of), redundancy, safety, maneuverability,etc. Our IG is based on the GB36 to a degree, and I like the twins. My previous 34ft Masters was a single, I recently looked seriously at a 2016 Fairway 37(big model change in 2014) with a single, but with thrusters both ends. I`m open minded about it but would likely opt for twins, though if you found a really good boat with a single, don`t rule it out.
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Old 10-21-2017, 07:48 PM   #8
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I'd try getting to the engine parts between the side of the engine and the hull before deciding on twins in that size boat. Some can be really tough to work on.

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Old 10-21-2017, 08:32 PM   #9
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I have twins and a bias for them. But Ted is right, you should take a look downstairs and see what you'll be facing for even routine maintenance with twin engines on this boat. If it has to be a GB 36 for you, a single might just be the ticket.
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Old 10-21-2017, 08:40 PM   #10
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If GB marketed the 36 w twin 75hp engines or a choice of a single 150hp then I’d go for the twin. No question.
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Old 10-21-2017, 09:26 PM   #11
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GB widened the 36 somewhere around 1986 and also produced the “Motor Yacht “ version with twins.
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Old 10-21-2017, 09:54 PM   #12
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Quote:
Originally Posted by Nomad Willy View Post
If GB marketed the 36 w twin 75hp engines or a choice of a single 150hp then Id go for the twin. No question.
The minimum GB twin here was Lehman 120, Cummins 210, Volvo 165 and up.
My IG beam is about 12ft 6",I had to get down the side of the stbd Lehman to the raw water pump recently, not what I call fun.
Some IG32s( similar to GB32)had twin Lehman 80s, a great combination imo.
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Old 10-21-2017, 10:22 PM   #13
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Twin or single

In a 36 - I would go a single.

The 36 is not a big boat & IMHO the single's lower initial cost, lower maintenance costs, lower fuel costs, & ease of getting to everything is all a big plus & the Extra room in the Engine room allows you to save usage of four letter words & frustration levels, I do all my own maintenance & love the extra space to do maintenance in comfort, which to me makes it a winner.

You would be happy with the addition of a bow thruster to assist, but on something as small as a 36, it is not mandatory.

Need to learn the single prop handling tricks, but nothing you can't handle.

With twins it is a very tight engine room. As I do all my own work in there, Not fun to do double the amount of maintenance in there with half the room & very tight quarters.

Both work & yes I agree fuel is your lowest cost of owning the boat.

Good luck.

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Old 10-22-2017, 12:14 AM   #14
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A single will have easier access for maintenance. If only one engine, stay on top of maintenance. If you want to go fast to raise fuel consumption drastically, get twins. More likely, the choice will be academic. If you like the boat, buy it whether it is single or twin. Find moving at a knot below hull-speed to be efficient. GBs (single or twin) are over-powered at such a speed.

Have 80-horsepower single and bow thruster, will travel.
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Old 10-22-2017, 12:20 AM   #15
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Quote:
Originally Posted by BruceK View Post
The minimum GB twin here was Lehman 120, Cummins 210, Volvo 165 and up.
My IG beam is about 12ft 6",I had to get down the side of the stbd Lehman to the raw water pump recently, not what I call fun.
Some IG32s( similar to GB32)had twin Lehman 80s, a great combination imo.
This is essentially what I have in the 34 Californian LRC with twin Perkins 85s. (4.236 inline 4) It's a great combo of efficiency and redundancy with good access all around if one is reasonably fit and agile.
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Old 10-22-2017, 12:24 AM   #16
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This is essentially what I have in the 34 Californian LRC with twin Perkins 85s. (4.236 inline 4) It's a great combo of efficiency and redundancy with good access all around if one is reasonably fit and agile.
Agile doe not describe me.
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Old 10-22-2017, 01:06 AM   #17
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I have a Prairie 36 with twin Perkins 6 cylinders and find enough room to perform maintenance, etc. I just installed new oil & transmission lines on both engines and will admit it did require some engine room yoga.

However, I personally prefer having that second engine to get me where I SAFELY need to be over the cost and maintenance savings with a single engine. Maybe it's because I came from the sail boat world and always felt I could use my sails to get home if my engine failed.
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Old 10-22-2017, 02:13 AM   #18
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If one's rudder and single-propeller are protected by a keel, one can avoid lots of problems. Just ask my two-propeller friends. (If you know me, you know them.)
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Old 10-22-2017, 06:43 AM   #19
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Quote:
Originally Posted by Captnick2 View Post
Hello fellow mariner!
I am seriously In the market for a 36 Grand Banks. I like many of the advantages of the single engine but need to know the actual differances in fuel consumption. Cruise speed and max speed.
Thank you in advance!
I was considering a 36' as well, its a very efficient hull that tops out at over 15kts on twin 210hp.I joined the Grand banks owners forum to get more info , and there is indeed a lot of very useful inside expertise on lots of diverse subjects.

My conclusion: the teak decks are a deal stopper.

There are literally acres of teak on a GB36'. Each strip of teak is screwed down when it is glued in place, then a wooden plug is glued on top of the screw. After a few years the caulking shrinks and the screws start to loosen and water gets into the plywood sub-deck.

If you strip off the teak, the rotten sub-deck will not support your weight, necessitating a complete deck rebuild......100's of hours work costing $$$
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Old 10-22-2017, 08:28 AM   #20
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I have always had smaller, outboard and i/o boats and two years ago I went to a 36'twin Diesel ( 40 with bow pulpit and swim platform ) after being unable to find a boat with a single we both liked.
Sometimes it comes down to personel prefference and availability.
Having said I took to docking the bigger boat with the twins almost overnight.
At 7 1/2 to 8 knots I burn about 3 1/2 gallons an hour for both engines.
What I like is the ability to go quicker if I want to get out of weather etc.
So far the only issue has been removing and replacing the port engine fuel pump and that gets done, what every 10 years or more.
In the end no right or wring answer.
Gool Luck,
Bill
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