Max HP for this 12' V-hull?

[Acton]

This is my 12' V Hull I bought off Craigslist in the hudson valley area last spring. Took it up to the adks with a 5hp outboard. Thinking of picking up a 2 stroke 10hp outboard for it though. It doesn't have the hp rating on the HIN # plate. . .

What do you guys think?

Also the seats in the picture came with the boat, but they make the boat to top heavy and unstable in the water. Would be nice to have some back support though, any suggestions?

Thanks!

 

[Scott Danforth]

that is a very narrow transom, so I would assume 10hp max, however I bet its closer to 5 or 8 due to the narrow transom

 

[steelespike]

That is really what I call a small 12 footer.I bet it doesn't measure 12' from transom to bow.
Maybe even not 12' measured along the gunnel.The beam appears to be about 4ft.Certainly no more than a 7.5hp probably about 450lb.
capacity including the motor. it is designed to be easy to car top or throw in the back of a full sized pickup.It's not going to do well
with 2 adults and gear With a tiller extension and you in the middle seat it may plane and make 10 or 12 mph.
We had a 12 ft flat bottom steel boat with a 5 hp Gale with a tiller extension and my 180 lbs in the middle seat it would pop on plane
in about 2 boat lengths and run at 10 or 12 mph.If your bottom is really rounded it may struggle a little but should plane.
You need to eliminate as much weight as possible I would lose the seats.

 

[Acton]

That is really what I call a small 12 footer.I bet it doesn't measure 12' from transom to bow.
Maybe even not 12' measured along the gunnel.The beam appears to be about 4ft.Certainly no more than a 7.5hp probably about 450lb.
capacity including the motor. it is designed to be easy to car top or throw in the back of a full sized pickup.It's not going to do well
with 2 adults and gear With a tiller extension and you in the middle seat it may plane and make 10 or 12 mph.
We had a 12 ft flat bottom steel boat with a 5 hp Gale with a tiller extension and my 180 lbs in the middle seat it would pop on plane
in about 2 boat lengths and run at 10 or 12 mph.If your bottom is really rounded it may struggle a little but should plane.
You need to eliminate as much weight as possible I would lose the seats.

Ive had the boat in the water already. Ive already got a 5 hp '53 sea king for it. Ive had 2 full grown men in the boat, with tye motor plus a 5 gallon gas canister, a deep cycle marine battery and a 6 speed trolling motor. Not to mention the cooler with ice and beer and a clamp on downrigger with an 8 lb weight. Im a big guy, weigh 270lb. . . I can stand in this thing no problem. The boat is stable, its a v hull. My gf can pull herself into it from 4 ft of water.

The transom is 50 something inches, I remember asking but Ill take a look when the snow melts. The boats actually a little longer then 12', I think the photo just tricks with peoples depth perception. Ive never felt unsafe in this boat, and like Ive said before Ive had 5he boat fully loaded up and it still sat pretty high in the water. Couldnt get it to plane with a 5 hp. I am concerned about how much more a 10 hp 2 stroke will weigh then my old 5 hp. Its an old motor though, they're heavier then most motors of the same hp built today...

 

[steelespike]

Sure fooled me usually a boat that looks small out of water is truly small.
Todays boat about your size is 12' ,56" beam,27" bow height.15" transom is rated for 10 hp.
The 5 hp is about 46 lbs. A Evinrude 9.9 from the 70-s about 66 lbs.
Actually the newer the motors get the heavier; they become more and more complicated.
A 25 hp from the late 70s is about 100 lbs, todays Evinriude direct injection 2 stroke 25 is as much as 172 lbs.
A 9.9 will do about 20mph on a light reasonably fast boat.

 

[Acton]

No Title

Sure fooled me usually a boat that looks small out of water is truly small.
Todays boat about your size is 12' ,56" beam,27" bow height.15" transom is rated for 10 hp.
The 5 hp is about 46 lbs. A Evinrude 9.9 from the 70-s about 66 lbs.
Actually the newer the motors get the heavier; they become more and more complicated.
A 25 hp from the late 70s is about 100 lbs, todays Evinriude direct injection 2 stroke 25 is as much as 172 lbs.
A 9.9 will do about 20mph on a light reasonably fast boat.

Thanks for the info! Ill do some measurements to see if my boat matcbes up with that. Before I posted this topic I was looking around on the net trying to find some sort of table that matches up the measurements of the boat with the max hp rating, from what you guys are indicating its a ratio where the hp scales up related to how long/tall the transom is. . .

Here's a few more pictures of my boat this summer. The quality isnt great....

 

[Acton]

No Title

Second photo...

 

[64osby]

Nice looking Tinner you have .

It reminds me of a Dura Craft that I flipped a couple years ago.

http://forums.iboats.com/forum/gener...y-maybe-a-50-s

 

[Acton]

Nice looking Tinner you have .

It reminds me of a Dura Craft that I flipped a couple years ago.

http://forums.iboats.com/forum/gener...y-maybe-a-50-s

Thanks! Thanks for posting the link, its nice too see Im not the only one kicking around in a tinney! You're right thats very similar to what I got. I see you took the old paint job off, I plan to do the same to mine this spring too. Saw a youtube video that showed how to take the paint off with chemical paint remover mixed with flower. Afterwards the paint just scrapes right off apparently. I only have access to a pressure washer or Id do it some other way.

I found this link on how to meqsure the height x length of the transom to determine max hp rating.

https://ca.answers.yahoo.com/questio...1070659AAp90CF

Im going to be taking a look at a 9.9 hp later this week I found on Craigslist. There's a lot of good stuff cheap on there this time of the year. Im going to have to get out and make sure my boat is rated for it before than!

 

[bonz_d]

Another option might be to look for an 8hp OMC. It's quite a bit lighter than the 9.9/15 hp and doesn't give up that much performance. My brother in MD ran one on a 14' full of crab traps and even with 3 adults in it, it did OK.

 

[64osby]

Pretty sure the video you saw was Inmotion, he has posted his work here. If you are in Canada you can get the same product he uses.

Edit - Looks you're in New York. Maybe close to the border? Other paint strippers do work but may not be as easy to use.

If you look at at my signature click on the 14' Lone Star link. It might give you a few ideas. The small tin boats are pretty easy to work on.


Any marking on the hull. A plate or a number stamped into the hull? If stamped usually on the starboard transom corner.

 

[Acton]

Pretty sure the video you saw was Inmotion, he has posted his work here. If you are in Canada you can get the same product he uses.

Edit - Looks you're in New York. Maybe close to the border? Other paint strippers do work but may not be as easy to use.

If you look at at my signature click on the 14' Lone Star link. It might give you a few ideas. The small tin boats are pretty easy to work on.


Any marking on the hull. A plate or a number stamped into the hull? If stamped usually on the starboard transom corner.

Here's the video I saw on youtube.

https://www.youtube.com/watch?v=ZJVyacEQLPM

Yeah its got a plate with the HIN number on it, and the manufacturer. I think it's chrysler or something. . . I can take a look later this week. There's ice all over it right now. I remember being surprised it was made by a car manufacturer.

 

[64osby]

That is Inmotion. He has done some very nice work.

If it is a Chrysler it will have a good history, they bought out Lone Star. Lone Star designed and built quality tin way back when.

 

[Acton]

So I realized that the manufacturer would probably be listed on the registration and it was; turns out its a cadillac!

 

[64osby]

http://www.fiberglassics.com/library/Cadillac

Might be some good info there.

 

[BF]

The transom is 50 something inches, I remember asking but Ill take a look when the snow melts. ..

There is NO WAY that transom is 50" wide. Maybe the beam is 50" (width of the boat at its widest point), but not width at the transom. The equation you talk about uses width of the boat at the transom, and I imagine yours is closer to 3', and maybe less. 12' length x 3' at transom = 36 and would put it in the 5 hp max category.

 

[BF]

oops... missed something.... in the page you link to, it also says this...

" Except if the transom is less than 20" high *or* the motor is tiller steered, in which case:
..........Length x Width x 0.8 minus 25, rounded up to the next multiple of 5."

Being a tiller steered boat.... and presuming a 3' wide transom....

12' length x 3' width = 36
36 x .8 = 28.8
28.8 - 25 = 3.8
Round up to "5"... then max hp is 5 hp.


For a 12' long boat that has a 4' wide transom..
(12 x 4 x .8) - 25 = 13.4... so I guess would round up to "15 hp max" (assuming the info in that post is not bogus)

 

[hardwater fisherman]

I have an old tin boat made by alcan which is 12ft long with a 48 inch transom and a 55 inch beam. It might not be as deep as yours. It is rated for 12.9 hp. It once belonged to my uncle and he had a 15hp 2 stroke yamaha and that was too much motor for the boat. I now run it with an old omc 9.5hp and with that is ok. I also ran my 1978 4hp johnson and it did ok but not very fast. What im saying is that 8hp would probably be enough for you.