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Old 04-18-2019, 08:13 AM   #341
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Nope... That is totally accurate. The Navigator hull design (full planing hull BTW) is an incredibly efficient and well designed hull. It's why, for the same class boat, you will always see engines in other boats have far more horsepower than Navigators. So at our cruising speed of 19mph (sorry... I don't do knots yet) with our TAM63 motors (318hp each), we get in the low 20's COMBINED in fuel burn. But that is up on plane and really scootin' it. That said, at 8 or 9 mph, we get 8gph combined.

And for the record... all Navigators are like that. Regardless of size. Jules was THAT good.
Can we see different angle photos of bottom on the hard? Any MA or ME drawings-plans you could print copy of?? I'm very interested to learn Jules' Navigator super efficient design factors compared to other boats' hulls.
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Old 04-18-2019, 08:19 AM   #342
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Oh wait....I was using 48 foot specs. YOUR boat 30000 pounds(straight from the Navigator promotion pamphlet).... Do you not think other manufacturers would have adopted this hullform if it was so extremely brilliantly efficient? I will buy a Navigator 58 tomorrow if it burns 22gph at 17 knots. That is insanely efficient. 44gph at 17 knots is not bad at all....If I were Mr. Jules and that is a real figure, I'd be pretty damn proud of that figure. But I will stand by my "suspicions". And the only way to convince me would be real life....not he said/she said....especially someone that is trying to sell something.

Also see what my boat weighs and burns at cruising speed as I posted earlier and then scale it up to yours....right in the ballpark!!! No unicorm magical hull going on here!!! I even have the same HP engines as you do and just a slightly lighter boat.
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Old 04-18-2019, 08:38 AM   #343
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In these big fast boats weight has more to
do w efficiency than hull form generally speaking.

But like FF says fat boats don't do well.
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Old 04-18-2019, 09:26 AM   #344
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With all this talk of 14 - 17 - 20 knots, I'm feeling a bit inadequate with my top speed of 11 mph - but at cruising speed of 8 mph I'm burning about 4.3gph in my twin Lehman 135's.
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Old 04-18-2019, 09:59 AM   #345
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That is of course if you ever actually cruise at that slow a speed!
LOL...Art, you hit the mark with your above quote! Next time out, If I think of it, I'll take a few photos of fuel flow at various speeds and rpm. After reading this thread I'm kinda interested in the info myself!
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Old 04-18-2019, 10:19 AM   #346
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With all this talk of 14 - 17 - 20 knots, I'm feeling a bit inadequate with my top speed of 11 mph - but at cruising speed of 8 mph I'm burning about 4.3gph in my twin Lehman 135's.
Don't feel bad, my top speed is 8.5 knots. But then I cruise at 7 knots at 2 GPH.

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Old 04-18-2019, 10:29 AM   #347
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With all this talk of 14 - 17 - 20 knots, I'm feeling a bit inadequate with my top speed of 11 mph - but at cruising speed of 8 mph I'm burning about 4.3gph in my twin Lehman 135's.
Hey Charlie,
That sounds about right.
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Old 04-18-2019, 11:16 AM   #348
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For what it's worth
Attached Thumbnails
Click image for larger version

Name:	Fuel.JPG
Views:	56
Size:	147.6 KB
ID:	87647  
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Old 04-18-2019, 09:58 PM   #349
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For what it's worth
Not bad at all Tom!!!!
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Old 04-19-2019, 01:12 AM   #350
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Come on folks, you look at the window sticker of a car..... no one believes it.
That sticker makes no allowances for the 'style' of the driver, YOU.
Take that factory/builder's 'window sticker' and build your very own, personalized table.
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Old 04-19-2019, 07:12 AM   #351
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Come on folks, you look at the window sticker of a car..... no one believes it.
That sticker makes no allowances for the 'style' of the driver, YOU.
Take that factory/builder's 'window sticker' and build your very own, personalized table.

What are you saying, Dan? Are you calling me a liar and this document false? I am a Navigator owner and have talked to a lot of other owners. We have a Facebook page where we talk about... go ahead and guess... Navigators. Correct. But, for a moment, letís say I am full of sh1t and this document is fake, how far off do you think it is? 2x? 4x? 100x?
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Old 04-19-2019, 07:38 AM   #352
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For what it's worth
We cruised many 100+ nmile legs with a 48 Navigator alongside and those numbers look pretty much in line with what he was getting.
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Old 04-19-2019, 07:44 AM   #353
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That spec sheet is in error. It states a D6-330 pair burns 27gph (total?) at full power, 3500rpm. Volvo spec sheet has a single D6-330 burning about 18gph at full power. I can believe 36gph, but not 27, for a pair.

It is wrong whether for a single engine or for both. You are not going to get 660hp out of 27gph on two little high rev Volvos.

Puts the rest of the data into doubt.
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Old 04-19-2019, 07:50 AM   #354
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Fine... just drop the whole thing and move on.
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Old 04-19-2019, 07:54 AM   #355
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That spec sheet is in error. It states a D6-330 pair burns 27gph (total?) at full power, 3500rpm. Volvo spec sheet has a single D6-330 burning about 18gph at full power. I can believe 36gph, but not 27, for a pair.

It is wrong whether for a single engine or for both. You are not going to get 660hp out of 27gph on two little high rev Volvos.

Puts the rest of the data into doubt.
Don't know about the WOT numbers but the cruise speed and typical nmpg for the 48 Navigator is right on the spot where our friends boat was.
Just not that surprising for that boat though - the other sizes and engines we cannot comment on as we have no experience.

FWIW- our 47 Bayliner would use less fuel then those numbers at fast cruise on long legs of trips.
YMMV
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Old 04-19-2019, 08:01 AM   #356
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We keep getting testaments on 42's and spec sheets from the builder but none of these have the boat or the engines in question on them. It's like saying on a 44' Riva with 800's, I get this and then apply it to a 63' Riva with 1360's. We're talking a 58 which is at least 80% more boat than the 42. We're talking larger engines. I'm not speaking to what anyone is getting on the 42, but I am stating the numbers initially stated on the 58 are wrong.
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Old 04-19-2019, 08:30 AM   #357
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What are you saying, Dan? Are you calling me a liar and this document false? I am a Navigator owner and have talked to a lot of other owners. We have a Facebook page where we talk about... go ahead and guess... Navigators. Correct. But, for a moment, let’s say I am full of sh1t and this document is fake, how far off do you think it is? 2x? 4x? 100x?
Tom,
No I am not calling you a liar. I am saying, take the published data with a grain of salt. A lot depends upon the weight of the stuff we put on board, the seas, the currents, wave height and and and.

I have the data sheet on my AT34 (sea trial of my hull #, loaded 1/2 1/2). It maybe close but, I would not bet my last 5 gallons on reaching my destination.

Please, ReRead the caption at the top of your document.
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Old 04-19-2019, 08:35 AM   #358
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Per my broker, who piloted it from Olympia to Seattle, when I asked the actual fuel economy he experienced:

"That [fuel economy] is for both as when we speak about fuel it is the total for both. When we ran it to Seattle we avg 12 to 14 knts and the owner said we would use 12 to 14 gal per hr or 1 gal per mi which is very good for a vessel of this size and displacement."

Now, they didn't take it to 17, so clearly they know a thing or two about the exponentially-increasing cost over speed. But I guess that's what we're looking at.

Thoughts?

I am not familiar with that Navigator or those specific engines but here is a boat test on a 2004 - 56' Navigator that may help out some....
https://www.powerandmotoryacht.com/boats/navigator-56

I have found at times you can also get additional information that is not online by heading to your local library and asking for help with the microfilm and past periodicals - helped me secure some old boating tests that I then copied.
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Old 04-19-2019, 09:29 AM   #359
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Old 04-19-2019, 09:39 AM   #360
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WOT 11 knots

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