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Old 22 May 2013, 17:24   #11
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I need to plot out the trip on a map or software. Does anyone have a recommendation for how to do this? is there an app for that?
For quickly planning gas usage, Google Earth is as good as the next. Navionics app for iPad is good for actual navigation planning (Google doesn't know where the rocks and shallow bits are...)
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Old 22 May 2013, 18:41   #12
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I will check with the inflatable boat store on this. To my knowledge MilPro gas bladders of various sizes are available from Zodiac.
Never seen one in this country. Its my understanding that they are neither USCG nor DOT approved for gasoline which is probably why they aren't imported despite being in the Zodiac catalog. The diesel ones are made by Vetus I think, they are available from West Marine and other vendors.

18 gallons is still rediculous. I can get 2+ typical trips out of my 12 gallon tank with a Yam F60 and a whole lotta scuba gear.

Have you been boating before? In an inflatable or otherwise?
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Old 22 May 2013, 19:24   #13
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Miles? What's the differene?

General rule of thumb for fuel usage on any petrol engine..... 10% of your horse power x us gallons an hour

E.g. 100 hp engine will burn 37 litres an hour.... At full power....


Very general, but often correct.....
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Old 23 May 2013, 11:45   #14
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This discussion is kind of odd.

OP has a trip planned (though no solid evidence of knowledge of distance or conditions), in a boat with insufficient space for pax+cargo, with no idea of how the boat performs in terms of handling or comsumables, and no engine to do tests on (or prior knowledge of the setup.)

Kind of sounds like a recipe for disaster.

My suggestion would be to obtain a motor, and get some experience on the water while amassing performance data so you at least have an idea of what might happen.

Then take 1/3 to 1/2 of expected fuel needed as a reserve, along with the more consumable (and easily replaceable) parts, just in case.

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Old 23 May 2013, 12:08   #15
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I have kayaked to this particular destination for several years. I am planning a trip 4 months from now and the fall back plan is to kayak there if this plan is deemed unsafe or unreasonable closer to the target date. The boat is currently being serviced and I plan to do several test runs before the trip. As I said before I do have an engine that I will install and test as soon as the boat is back from service.

I was under the assumption that a boat rated for 10 people/2,205 lbs would at least be able to carry 4 persons and some gear. Compared to a kayak its pretty damn roomy if you ask me.

The destination is a 7 nautical mile round trip with around 7-10 miles added to that if we choose to explore the area.
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Old 23 May 2013, 12:57   #16
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The discussion may be odd but the original question is not. I just wanted to know if there were some general guidelines in terms of fuel consumption which would drive the need for tank size. I wasn't aware that I had to present "solid evidence" in order to get this question answered.

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This discussion is kind of odd.
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Old 23 May 2013, 13:02   #17
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The discussion may be odd but the original question is not. I just wanted to know if there were some general guidelines in terms of fuel consumption which would drive the need for tank size. I wasn't aware that I had to present "solid evidence" in order to get this question answered.
It'd help if

A) You had a motor to calculate gas usage for

B) You could say roughly how many hours/how far you'll be travelling on a regular basis.

The question is impossible to answer otherwise.

<edit> Just saw the 7-10 miles figure. I'd carry a pair of 5 gallon or 6 US gallon tanks.
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Old 23 May 2013, 13:29   #18
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Originally Posted by F470 View Post
I was under the assumption that a boat rated for 10 people/2,205 lbs would at least be able to carry 4 persons and some gear. Compared to a kayak its pretty damn roomy if you ask me.

The destination is a 7 nautical mile round trip with around 7-10 miles added to that if we choose to explore the area.
The boat will be fine. I'd carry 3 or 4 divers (with tanks and weight belts etc) so at least as much as you'll have. You might have a "2200 lb" capacity but you'll never plane that kind of load. If you're not planing your consumption will be stupidly high. And if the water gets a little rough you run the risk of swamping the boat, which won't sink it but you won't be moving much like that.

The 10hp will struggle to plane this much. Minimum 25hp or the 35hp you mentioned before is pretty much a requirement. For ~25miles of total travel, I would carry 6+3 gallons of fuel to have ample reserves. 18 gallons is just more fuel weight that you don't need.
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Old 24 May 2013, 11:40   #19
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I have kayaked to this particular destination for several years. I am planning a trip 4 months from now and the fall back plan is to kayak there if this plan is deemed unsafe or unreasonable closer to the target date. The boat is currently being serviced and I plan to do several test runs before the trip. As I said before I do have an engine that I will install and test as soon as the boat is back from service.
Well, that sounds more hopeful. Still, plan on what you're going to do if things don't go the way you plan.



Quote:
I was under the assumption that a boat rated for 10 people/2,205 lbs would at least be able to carry 4 persons and some gear.
The 10 person thing is for weight only. While you *may* be able to get 10 people sitting somewhat safely on the boat, you 1) will find it's pretty damn tight and uncomfortable, and b) won't go anywhere quickly. Bottom line: the boat will float safely with that number of people, but I certainly wouldn't call it "usable" in that state.


Quote:
The destination is a 7 nautical mile round trip with around 7-10 miles added to that if we choose to explore the area.
14 miles, plus sightseeing fuel. Shouldn't be an issue. A 6 gallon tank should do the entire thing, even if you go a little nuts on sightseeing. You should think about carrying a small (2-3 gallon) backup tank of fuel in case you get water or dirt or something that renders the main tank unusable.

The reason for details is that, much like cars, the boat and motor have a lot to do with what your burn rate is going to be. 4mpg is about "normal, but it may be higher or lower depending on a lot of factors, and that discounts weather and swell, which will affect it to some degree as well. Hence the need to take your combination out and see what kind of performance you get before you take off into the sticks.

How remote is the destination? Other boats around? Other land based stuff? Make sure you can contact someone in case of problems (VHF, cell phone.)

7 miles is a long way to row.

jky
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