1959 35hp Power at the Prop?

[scout-j-m]

What might the horsepower rating at the prop be for a 1959 35 hp Evinrude? My understanding is that at that time it was rated at the crankshaft.

I am asking because I was wondering if modern day boats with say a 25 or 30 hp rating could handle that outboard. I think weight-wise that 35hp (130 lbs maybe?) is similar to a modern 25 hp fourstroke.

 

[oldboat1]

better historians here than me, but think there would be less than 10% decrease from crankshaft to prop rating -- maybe less than that (3 to 5%?). A 25-30 hp hull rating would be fine for it, I'm sure -- but would get you a ticket. Would like to be a Mayfly on the hull when you make your case with the guy in the Whaler with the blue light....

badging and hull plates aside, pretty sure the 2-cycle '59 in good running condition will likely do very well against a modern 25hp four stroke on identical hulls. Interesting comparisons, but pretty much apples to oranges. Solution is to get the four stroke with a nice new hull, and an MFG or a Feathercraft for the '59. Let the new four stroke stay outside, and keep the Feathercraft and the '59 in the garage. (JMO, of course.)

 

[F_R]

Horsepower and weight may be somewhat related, but that is only part of the story. If you are concerned about the weight, the boat capacity plate should show the maximum allowed weight for motor, passengers, gear, etc.

 

[flyingscott]

It really doesn't matter it's 35 hp no matter how it's rated. So no matter what you put it on it has to be rated for a 35 or it's illegal.

 

[scout-j-m]

I appreciate the replies. I'm sorry if I came across as looking for an argument to give to the marine police when they try to ticket me. The question really stemmed from my brainstorming on boat/motor combos. In this case it's thinking of an aluminum fishing boat that can be marginally powered by a 9.9 hp for my local hp restricted lakes and then re-powered with my 35 hp I mentioned for use on the river and larger reservoirs. Most of the boats nowadays are rated for 25 hp or jump up in rating to 40 hp with the 40's appearing to be much too large for any 9.9. I guess it is a pick your poison type of deal.

 

[oldboat1]

nah, just messing' scout-j-m. Seem to be a lot of Starcraft 14 footers around (the runabout version), with 35-40 hp. A lot of other possibilities in 14 to 16 footers too, rated for up to 40hp or so (Mirrocraft used to have a model -- and a lot of period boats like Lonestar). Think you can come up with something for both the 9.9 and the 35, although switching out might turn out to be a hassle. The '59 is pretty beefy to be hefting around.

All good. (Think you need a rig for the restricted lakes, and one for exploring bigger water.)

 

[racerone]

I think you will find that the 59 ----35 hp is a lightweight compared to newer motors.

 

[scout-j-m]

nah, just messing' scout-j-m. Seem to be a lot of Starcraft 14 footers around (the runabout version), with 35-40 hp. A lot of other possibilities in 14 to 16 footers too, rated for up to 40hp or so (Mirrocraft used to have a model -- and a lot of period boats like Lonestar). Think you can come up with something for both the 9.9 and the 35, although switching out might turn out to be a hassle. The '59 is pretty beefy to be hefting around.

All good. (Think you need a rig for the restricted lakes, and one for exploring bigger water.)

Yeah. I actually have a 17' aluminum bass boat now which serves that purpose, however, my "end game" so to speak is to replace it with a glass boat. And then get a smaller aluminum boat as I described. Guess I may have to change my vision to 3 boats instead of the 2 lol.

And you are right...I bet swapping them out may not be a big deal at first but after doing it for a while it would get old quick.

 

[pro-crastinator]

You can tell yourself anything you want - but its a glorious, fun filled "trap" - these boats and things.
My loving, understanding spouse (is she reading this?) has put up with my boat and motor "problem" better than I had dreamed.
Just be sure to keep a finger on the pulse of the missus. Happy wife, happy life.

I do have a 1965 starcraft 14 footer that is rated for a 40 but the 25 4 stroke on back of her is a textbook example of the modern dilemma of heavier motors on older craft. Patience and smarts is the solution there - but remember that there are always trade offs.
Best O luck.

Post script: 1957 Evinrude 35hp weight is 135. 2015 Yamaha F25 weight is 175

 

[oldboat1]

Yeah. I actually have a 17' aluminum bass boat now which serves that purpose, however, my "end game" so to speak is to replace it with a glass boat. And then get a smaller aluminum boat as I described. Guess I may have to change my vision to 3 boats instead of the 2 lol.

And you are right...I bet swapping them out may not be a big deal at first but after doing it for a while it would get old quick.

lots of interesting glass hulls too. Can set up a larger aluminum or glass hull with the '59 and a 9.9 troller, then use the troller on another smaller hull as well (little less of a chore to move around the 9.9 -- age a factor in my case. Actually, the weight to power ratio for that 2-stroke '59 will be very impressive, even if it's more than I want to carry around. Powerful motor, and very quick on a light hull.) I go all out with remote controls, so have to take that into account too for portability -- but easy for either motor, once in place. Need a Simplex box for the '59, and if you get really wild you can find a double box for twins, and set up both the main motor and troller from a single box.

 

[scout-j-m]

Thanks for the replies! Yall have all provided some very useful information. Now that I have some idea though, I'll have to push the hull planning to spring and spend the fall/winter working on the the old Lark since it has been sitting for a few years now.