I agree with darkwolf
You won’t get 20 mph out of that boat. My 16’ fishing boat with a 20 hp and just little ol’ me inside might be able to go that fast, and it is by no means slow.
Outriggers will slow you down a bunch too, unless they don’t touch the water. If they don’t touch the water, be prepared for some nasty jolts when they plow into waves. Be careful.
I’d also suggest you totally forget that 800-pound-plus load capacity. Usually such high ratings are made assuming it’s okay to have an extremely low amount of freeboard (six inches or less), and though your outriggers will help keep the boat stable when loaded like that (usually a canoe with that much weight has stability not much better than a floating telephone pole), the risk of swamping in the chop will be great.
Outboard motors usually have ratings for how long they run on a given quantity of fuel at particular throttle settings. As others have said, if you can’t find it in the owner’s manual, ask the maker - they’ll know. Then take that rating and give it a substantial safety factor. Your canoe probably won’t plane as well as a normal boat fitted with the same outboard (especially with a big load!), so fuel economy is likely to be quite a bit worse at full throttle than what the manufacturer says. On the other hand, fuel economy is likely to be better than with a normal boat at low throttle settings, because a canoe is a much more efficient displacement hull than the average small motorboat.
The Lake
The lake is Reindeer Lake in norther Saskatchewan. It has 5000+ islands 90+ tributaries and is the 22nd largest lake in the world. I have seen 5’ rollers before, and obviously one needs to sit it out, the base camp location is in a sheltered area with open water of only a mile or two, however to get there, requires crossing some big open stretches with only rock islands every few miles. I have fished it before in 18’ Lund Alaskans, however, this time I plan on getting into some lakes adjacent to the main body so I need to take a canoe, to gain access. The lakes I plan on exploring have not been accessed and likely never have been fished. Last time I went into one we boated 50+ walleyes in the only two hours we fished. Our largest northern pike from the main lake was 43" and several others were over 40". No doubt this is more of a fishing exploration trip than pure canoeing. Thanks.
Speed
Thanks for the helpful information. I just tested the freeload at 580 lbs and the free load was 8" and my out riggers were not touching on on calm water.
I was up in northern Manitoba once and saw a conservation officer with a large motor on a pontoon rigged canoe. (I would guess it at 10+ hp) and he passed my 14’ fishing boat with a 25 hp motor. I suspect he was going 25 mph plus. I know this sounds like a far fetched but with wide pontoons maybe about 3’ extensions on each side, his canoe was more like a catamarand (sp?).
What free load do you feel is safe when using a canoe as a freighter?
perseverence99
How fast?
After I test the system with whatever motor I get, I’ll post some speed numbers at different loads.
Which outboard are you thinking of?
Reindeer Lake
I worked at the north end of Reindeer Lake from Jan. to Aug.in 1970.It is a beautiful lake.As I recall the fishermen and trappers there mostly used 16ft cedar canvas canoes with 10 horse motors.
Largest outboard on a freighter canoe
A long time ago I was out on a big lake (South Indian Lake Manitoba) in a canoe with a 20 hp motor. I would not recommend it. I was the bow ballast. Good thing 17 year olds are immortal. The usual was 9.8 hp, if I remember correctly.
Motor Considerations
I am thinking of the Honda 5 or 6 hp four stroke with the possibility of bumping up to an 8 hp. (All in short shaft). The 8 is getting heavy to portage since many of the remote areas do not have portage trails.
Bow Ballast
I have been bow ballast before when I was sure that the boat (a 16’ aluminum fishing boat) was going to buckle under crashing from every 5’ roller. I have never fished Southern Indian but have fished the Churchill River leading up to it. It is nearly identical to Reindeer and thanks for the information.
Perseverence99
an idea…
take your canoe with a small outboard, and tow it behind your regular v-hull fishing boat. Once the boat gets up on plane, the canoe actually rides the wake fairly well. Then, you have the canoe for portaging into small lakes, and the large boat for stability and power getting across large open water.
Motor Considerations then.
The Honda 5 is about 56 pounds I believe. Should hang on that transom ok but like was mentioned, follow the USCG ratings BUT… make sure the ratings are not based on horsepower alone. A 6 HP rating does not necessarily mean a 4 cycle 6 HP. It may mean a 30 pound 2 cycle 6 HP. I don’t think there is much I can show as proof of this but that is what I have been learning over the years. The advent (and it’s about damn time) of smaller 4 cycle outboards is introducing more transom weight for the same horsepower, albeit badly needed.
Thanks for going 4 cycle!!!
I have a Briggs and Stratton air cooled 5 HP 4 cycle (I’m poor, grin) that I just love. 56 pounds though! While I can curl that all day when I hang it on my 13 foot sailboat she gives me a look…(grin) I built her transom (Ash and marine ply laminate transom with an ash and two cherry knees) to take the thrust and weight but she really puts her transom down in the water until I get in as mid-ship ballast.
Make sure your rating will accomodate the weight as that is going to be a big factor in how the construction of your boat holds up. Get a documentable (e-mail great) response from the manufacturer on transom weight caps as well as HP if you can.
Good luck!
I have a 1973 Grumman 17’ transom canoe I bought just because paddling Lake George with myself, a 9 year old and my 140lb. Swiss Mountain dog are way too much to paddle around a 30 mile lake. I started with a 55lb thrust trolling motor and a series 31 deep cycle. it gets you to where you,re going eventually, but you better have a spare 24 or something just in case. I got sick of all that and bought a 5hp coleman 4 stroke that goes along at a decent speed. I suggest outriggers since your center of gravity is above the gunwale, also if you’re running alone put a 50lb water bag or other type of ballast in the bow. Now back to your original question. That canoe was rated for 5hp in 1973. Motors since then have gotten much lighter. the Coleman 5hp being I think 56lb. Now the 7.5hp Gamefisher is only 40lbs. To me that’s the motor to get. Here’s a link to one I found for sale. 384e71c1ad5031b9b4485f221004d69e@sale.craigslist.org These canoes are tough as hell, as long as you have some ballast in the bow your good to go, pontoons couldn’t hurt either. good luck my friend,
A small engine weighs a lot less if you have to portage.
Most square stern canoes do say 5HP max, but a small 3 HP is usually more than sufficient. 20 mph in a canoe is downright scary.
I have never gone above 5hp. Most of the time if I find a stamp on a canoe they say up to 5hp. I know that’s not all boats but at least has been my experience.
A 17 foot canoe with a 36 inch beam is a typical size for a paddling canoe.
Yours just happens to have a transom.
It is very easy to capsize such a canoe when it is loaded. You and the engine put a lot of weight aft.
Forget about 20 mph. A more reasonable speed would be about 6-8 mph, much like a drift boat with a small outboard.
A 3.5 hp is a good size, because they are light and will get you some speed. under 40 pounds.
The 4-6 hp engines have the same block with different carbs. they weight around 60 pounds.
An 8 hp engine weighs around 90 pounds.
Now that electric trolling motors are available with up to 86 or more of thrust and you only need about 2 lbs for every 100 lbs of boat, a 40 or 50 lb thrust model would be about double what you need figuring on 1,000 lbs of boat and gear. With a lighter load you could easily get over 10 mph.
Lighter load won’t be enough. Trolling motor props are pitched for low speed and high torque. You might be able to replace the prop with something faster.
And marine batteries weigh 60 lbs and up. Personally I’d go with a 3.5 hp outboard, maybe 30 lbs including the gas.
How far are you going to get on an overnight trip with a battery powered motor?
You could bring solar panels.