Comparisons, boat ideas

KC8QVO

Petty Officer 1st Class
Joined
Jun 19, 2012
Messages
247
I just got back from a couple weeks on Lake of the Woods. I've looked at some boats to get in the past, just throwing around some ideas. I've been around boats all my life but I've never got in to all the in's and out's, maintenance, etc. Dad always took care of his and all the boats we have/have had up on the lake are kept at a marina.

The boats I have to run are a 20-22' princecraft pontoon boat with 60hp motor and a 16' lund (similar to a modern SSV) with a 25hp motor. Most of this trip I ran out in the 16' lund.

Two days in a row I went way out on the lake exploring. One of my goals this year was to learn more of the lake, and to do that I have to get out there. So I grabbed a map and off I went. Both days I burned through 12 gallons of gas - 2 6gal tanks. Looking at the map the approximate mileage was 30-35, so about 2.5-2.9 miles per gallon. And this is a 25hp tiller motor on a 16' boat.

I'm not real familiar with fuel burn rates on the different types of motors, but my hunch is the 2 stroke 25hp motor sure likes to drink. I'd think that would be true for all the 2 stroke motors, regardless of hp in comparison with a 4 stroke equivalent they are probably much less efficient. The 25hp motor and boat are the same vintage - 80's. The motor has electric start only, so I don't know if that means anything (I think there is an emergency chord starter under the hood, but no handle outside to pull - never had to use it).

Has anyone calculated their fuel burn rates/range in similar boats? What about bigger 18-20' open fishing boats up to 200hp? What motor - age, 2 stroke or 4 stroke, what hp, what speed?

I'm looking at getting another boat in the future but I want to know more about what I am getting in to. My ideal boat would run 35mph without difficulty (IE - not max RPM's with one person and nothing else in the boat - I'd like to hit that speed with some reserve with a couple people and gear), have sufficient range without sucking fuel down too quick (I don't know what defines that yet, if the comparison of my 25hp motor is proportionate to a bigger motor I'm in for a world of hurt), have an aluminum hull, be mostly open, and would have available a complete camper top (tonneu over the bow, bimini top over the cabin that is easy to see out of while standing without opening it, then closes off the stern at the back of the bimini top) and full width windshield. I don't need a real big boat, I'd like something around 100hp/18' but I don't know about the cruising speed and range. We had a 175hp/19' Lowe and I don't need that much (boat was rated to 150 and grandpa put a 175 on it).
 

Home Cookin'

Fleet Admiral
Joined
May 26, 2009
Messages
9,715
Re: Comparisons, boat ideas

there are charts to tell you your MPG and more important for boats, GPM. The charts confirm this: boats use a lot of gas as far as transportation goes. You do your best with efficiency but at the end of the day you are happier if you just don't think about it.
Lake boaters tend to focus on top speed more than coastal boaters because our waters are choppy and we seldom run WOT for any distance.
When it comes to efficiency, the two things that matter most are hull design and weight. I run a 19' Carolina skiff--perfectly flat bottom and ultra light--with just a 50 HP. If it were a deep V center console or a bow rider sofa boat it would be a pig. The aluminum starcrafts with a modified V can run a much smaller motor than a similar length glass boat.
 

nyx2k

Cadet
Joined
Apr 14, 2007
Messages
18
Re: Comparisons, boat ideas

i don't think 3mpg is too bad,i get 4mpg on a 40hp 2 stroke on a 16ft dory. your fuel is very cheap compared to our equivalent $10 a gallon in England
 

pckeen

Commander
Joined
Jun 20, 2012
Messages
2,067
Re: Comparisons, boat ideas

I have a starcraft holiday, with a one year old Yamaha F90 on the back. It runs about 38mph WOT, and 26mph at cruising speed (4500rpm), with two adults and two kids in it. I can't tell you the gas consumption, but it is has less than half the gas consumption of my old 1969 115hp Johnson 2 stroke. I have run about 4-5 hours on it (combination of cruising and trolling, but mostly cruising), and only burned through about 20 liters of gas.
 

roscoe

Supreme Mariner
Joined
Oct 30, 2002
Messages
21,763
Re: Comparisons, boat ideas

Not really sure what you want in a boat.

Mostly open / full windshield ?? walk thru windshield or full windshield?

full camper top - for while in use, or while moored?

bimini top - will be open all around

see out of while standing without opening? (convertible top ??) convertible top will attach to windshield.

If you want to stand and see thru a convertible top, you are talking bigger boats with tall windshields, and big engines, and 50 gallon fuel tanks.



please clarify what you are talking about.

???
Alumacraft : Trophy Series : Trophy 205

My boat (18' Starcraft) with a 2000# load when we head out, has a 115hp. runs 45+, cruises at 22-24 mph @ 3100 rpm

I am propped for hole shot, not speed or fuel economy
 

KC8QVO

Petty Officer 1st Class
Joined
Jun 19, 2012
Messages
247
Re: Comparisons, boat ideas

Mostly open / full windshield ?? walk thru windshield or full windshield?

full camper top - for while in use, or while moored?

bimini top - will be open all around

see out of while standing without opening? (convertible top ??) convertible top will attach to windshield.

If you want to stand and see thru a convertible top, you are talking bigger boats with tall windshields, and big engines, and 50 gallon fuel tanks.



please clarify what you are talking about.???

As for windshields - the walk through type, not the single drivers side and the rest open. That is how my neighbors boat is and I hate it - no cover.

The top I am thinking of is both for out on the water and at the dock. My use for it would be mostly protection from the weather if it goes to pot out on the lake - have the top up and leave the sides in storage to pull out when needed. If i'm 2 hours from the cabin that is a long way to be stuck in rain, and we've been there done that.

The wellcraft dad had some years ago had a top on it that buttoned up to the top of the windshield. It had clear plastic above the window before the cover transferred to canvas. I remember coming in to port in a storm and dad had to open the top to stick his head out so he could see - sitting down the bouncing on the water and the bow blocked too much. The plastic wasnt clear enough to see good in the rain.

When I get on a computer I will dig up some pictures of what I'm talking about.
 

Bamaman1

Lieutenant Commander
Joined
May 15, 2011
Messages
1,895
Re: Comparisons, boat ideas

It sounds as if you need a 17 to 18 foot open bow deep V runabout. I had one with the folding windshield and a convertible top that snapped onto the windshield. You can also get a cover made that snaps over the bowrider seats if you're concerned about rain.

My boat was an inboard outboard, however big improvements have been made with 4 stroke outboards and EFI/DFI outboards. I would be looking for a boat with a 90 or 115 hp modern outboard motor. Both are very efficient on fuel.

On that boat with a 25 hp 2 stroke, it should be getting more like 7 to 9 mpg. It may need mechanical attention. I'm running a new Bennington 24' tritoon with a Yamaha F150 motor, and it's getting 4 to 4 1/2 mpg. I also have a 24' Starcraft pontoon with a Yamaha 115 hp 2 stroke motor that also gets 4 1/2 mpg.

When I'm out knocking around the lake sightseeing, I'll use a Yamaha VX Waverunner @ 10 mpg.
 

roscoe

Supreme Mariner
Joined
Oct 30, 2002
Messages
21,763
Re: Comparisons, boat ideas

I doubt you will see very well thru any window in the rain, without a windshield wiper.
Try turning them off on your car and then parking in a crowded lot, not gonna happen.


The Alumacraft Trophy or similar will suit your needs, and full enclosures are available.

And they are heavy boats, close to 2000# dry weight, pushing 3000 fully loaded on the water, so there goes your fuel economy issue.

As for the camper top enclosures, be prepared to replace occasionally if you let them sit out in the sun and wind long term.

You will also want a kicker motor on it if you are venturing out as far as you say.

$25-30k should get you a fairly late model rig.
 

KC8QVO

Petty Officer 1st Class
Joined
Jun 19, 2012
Messages
247
Re: Comparisons, boat ideas

This is similar to what I am thinking of with a top. There is a boat up at the lake that was set up like this, the back end of the enclosure cuts out the rear of the boat though - only the front 2 seats are inside. This one in the picture I think keeps all the seats in, I'd be curious if there is another panel that will get all the way to the stern instead.

http://tolimages6.traderonline.com/img/6/plcnad/6737708/359823_1.jpg?1142025

As to the kicker motor - I agree entirely. All my treks out past our bay I took a 9.9 as my spare. We used to have it on a real old core-craft boat but got rid of it about 3 years ago. I ran through all our outboards this trip and made sure they all ran. Between the 9.9 and a 4 I grabbed the 9.9 - it will move the boat if needed, the 4 might as well be a trolling motor.
 

KC8QVO

Petty Officer 1st Class
Joined
Jun 19, 2012
Messages
247
Re: Comparisons, boat ideas

How hard is it to get a spare/auxiliary tank hooked in? Most, if not all, the aluminum V-hauls have the tanks in the bottom of the V and there aren't options - each size of boat has a size tank it comes with. I'd rather avoid the spare cans - I had a 2gal can with the 16' lund if the tanks I took ran out. It's not a big pain, but also is not a lot of fuel and won't get me range beyond preventing being stranded a mile out on my way home. Unless I can get my burn rate down a lot 10-20 gallons on top of 25 or so built in would be nice = that will get me somewhere. It's not like I can stop at 2 gas stations on my way out and back like I do driving up there.
 

snowman48047

Petty Officer 1st Class
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Jul 24, 2008
Messages
371
Re: Comparisons, boat ideas

10-20 gallons on top of 25 or so built in would be nice.

This makes me think your motors have serious issues sucking down the fuel if you think you need that much. I have a 27 gallon tank in my Lund and I can fish Lake. St. Clair alot with that fuel. Even the 115 I have now after being out 5 times I haven't budged the guage at all. I used to carry a spare 3 gallon tank just as a safety measure, along with a 9.9 kicker. 2 engines and 2 sources of gasoline can't hurt. I also wonder if your 16' Lund isn't full of waterlogged foam. My Starcraft Islander had a 50 gallon tank and I didn't use that much all season.
 

KC8QVO

Petty Officer 1st Class
Joined
Jun 19, 2012
Messages
247
Re: Comparisons, boat ideas

I just ran some numbers on a 115hp merc 4 stroke. One estimate I looked up showed 5gph at 4000 rpm (10.5gph at WOT). Taking that in to account and figuring cruise speed in the range of 30-36mph with a tank capacity of 27gal that leaves a range of 162-195 miles. That is pretty respectable - 6-7.2mpg. I could get everywhere I would potentially run to on that. That is a lot better than my < 3 mpg. The hard part to swallow is my diesel 1 ton will do 15-20mpg at 11000lbs, 400hp. With 32 gallons thats a lot of range compared to such small boats. Wow. Sure, im not going as far or spending as much time in a boat, but its a head scratcher. I wish i knew what our old wellcraft got - v8 I/O :) Scary.
 
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