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Old 02-22-2016, 12:18 PM   #21
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Hi tony it was good chatting with you and I appreciate the work you have done to compile the gas mileage info.

But I can't seem to figure out gallons per hour at say 7-8 knots. I know it's in there (mpg) but I'm missing how to convert it. Thanks in advance, Bruce
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Old 02-22-2016, 04:58 PM   #22
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Look at 8 knots and see how many MPG you get, which is also 8 Nm traveled in one hour.
If for instance you get 1.75 mpg, just divide the 8 miles by the 1.75 mpg and you get 4.6 gallons used.
If you want to double check your figures, multiply the 4.6 gals by the 1.75 mpg and that will give you 8 miles.

I personally never count gals/hour. I always think in miles. I check my gas tanks and I see 50 gals minus 10 gals from empty and I have 40 usable gallons left. At 7-8 kts, I know I that at 1.75Mpg I can go 70 miles on 40 gals before running on fumes.
All of this is assuming no real adverse current or wind. I use a dipstick I made to accurately measure gas. I mean more accurate than any gauge, which I never trust.

When I buy my next load of fuel in a mont or so, I will give you the updated chart.

Feel free to call anytime between 8AM and 8PM EST- I am retired, so no problem.
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Old 08-20-2016, 09:23 AM   #23
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We just took possession of a '87 36' DC two days ago.
Twin 270 Crusaders.
Boat was a floating cottage last few yrs so have much to do.

I am quite interested in this discussion on performance.
We did a sea trial and while the tachs were working we ran a simulated cruise speed @ 3000 -3200.
Hull ran good/felt good but no speed measuring instruments on board.

Seat of pants said 14-15 which sounds way optimistic based on this thread???

I googled this boat and ended up here and joined.

I'm 57 yrs old, boated all my life, built, raced etc.
I am way impressed w/what I've seen so far.
Design and construction appear to be over the top.

I too was concerned w/the small blocks in so big/heavy boat.
The semi displacement hull designed led me to take the leap.

One motor rebuilt.
In watching/listening to motors under way, I am concerned about water reversion under way.

I have much reading to do but wanted to say Hi, and thank the many knowledgable authors on this thread.

Great reading.

Thanks!
Gary
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Old 08-20-2016, 10:21 AM   #24
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If you have a smartphone, download the Navionocs boating app. You can get tour speed in there via GPS and record your track and speedClick image for larger version

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Old 08-20-2016, 12:33 PM   #25
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Gary...
Welcome aboard TF
You will find most folks friendly & helpful

Have you searched online for that model?
You should be able to find published performance specs.
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Old 08-20-2016, 03:33 PM   #26
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Gary

I have a 1986 Mainship 36DC. We live-aboard and cruise on it full time.
Go back to page 1 of this thread and look at posts 19 and 20. This should give you all the info you want.
You should plane nicely at about 13-17 MPH and top out at a little over 20 with an average load.

Also, there is a Mainship group on Yahoo Groups that is specific to Mainships only. Here is the link: www.groups.yahoo.com/neo/groups/mainship
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Old 09-04-2016, 12:57 AM   #27
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1986 Mainship DC

I have twin Crusader 350 cu in engines and find that at 2500 rpm I consume 6 gallons per hour. Engines actually seem to be the happiest at around 1800 rpm. That's where they seem to operate the smoothest. In calm water conditions 2500 rpm gives me 7 to 8 knts. My boat is no speed demon but her comfort underway and at the dock make up for any shortcomings in speed.
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Old 09-04-2016, 07:17 AM   #28
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Greetings,
Welcome aboard Mr. j.
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Old 09-26-2016, 10:08 AM   #29
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Thanks for all the help guys and sorry I missed your replies. Somehow wasn't getting notices.

Have been working away at my to do list each weekend and making headway.

Will start a new thread so as not to clog up this one.

Thanks again guys.
And Gmarr, I have an i-phone.

Taking a hand held GPS next weekend.

Gary
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Old 09-27-2016, 07:57 PM   #30
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Quote:
Originally Posted by Tony B View Post
Go back to page 1 of this thread and look at posts 19 and 20.
Skimmed first and just took the time to reread and digest the info.
WOW!

Thank you sir.
Also just printed all 3 graphs.
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Old 09-27-2016, 07:59 PM   #31
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Quote:
Originally Posted by Bacchus View Post
Have you searched online for that model?
You should be able to find published performance specs.
Just briefly and failed.
Haven't had much time to play on the puter lately.
Hope to cure that soon and start doing home work.

Thanks much for your input.

Gary
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