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Fastest boat with 3.5hp?

Old 01-10-2019, 08:18 AM
  #21  
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Originally Posted by barrell View Post
The solo skiff. It was designed from the ground up by Tom Mitslaff to plane on 3.5 hp. I was involved in getting the new polyethelene models made. Tom will no longer make them out of Glass. When on plane it rides on the back third of the hull. You can see the sunlight shining under the front two/thirds. It gets 16mph and will plane through 6 to 8 inches of water. Fuel milage is insane.
I think the Solo Skiff might be about what he's after! The 16mph was achieved with what horsepower?

All other things being equal, how does the top end of the Porta-Bote compare with the Solo Skiff given 3.5 hp?
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Old 01-10-2019, 08:37 AM
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Posts like this one is why I get a kick out of THT!! What a goofy question.
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Old 01-10-2019, 08:52 AM
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https://www.soloskiff.com/faq/

HOW FAST WILL THE SOLO SKIFF GO WITH AN OUTBOARD ?

The Solo Skiff will plane with a 160 pound passenger and a 2.5 Hp Motor. The approximate speed will vary but around 8-9 mph.
The speed is about 12-13mph with a 3.5Hp, and speed with a 5Hp approximately 16-17 mph. Speeds all depend on passenger weight.
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Old 01-10-2019, 10:56 AM
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Originally Posted by Fatbill View Post
I think the Solo Skiff might be about what he's after! The 16mph was achieved with what horsepower?

All other things being equal, how does the top end of the Porta-Bote compare with the Solo Skiff given 3.5 hp?
I have no knowledge of the porta boat. I know about solo skiffs as I bought a glass one 8 years ago and then convinced Tom to get copies made in Poly by a fried of mine in Atlanta . I then became a solo dealer. I clocked mine with a gps and a 3.5 Nissan/Tohatsu. But I had way to many carb issues and now run a 4hp Suzuki.
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Old 01-10-2019, 01:40 PM
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Originally Posted by barrell View Post
I have no knowledge of the porta boat. I know about solo skiffs as I bought a glass one 8 years ago and then convinced Tom to get copies made in Poly by a fried of mine in Atlanta . I then became a solo dealer. I clocked mine with a gps and a 3.5 Nissan/Tohatsu. But I had way to many carb issues and now run a 4hp Suzuki.
Do you by chance know if it was the Tohatsu/Nissan two stroke with or without forward shifting? What prop you were using? That speed seems incredible considering that is what people seem to be claiming 5hp will do.
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Old 01-10-2019, 01:48 PM
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I've got a 4hp merc tiller that I've put on the back of a few little boats. I've had it on a variety of small aluminum boats and fiberglass dinghies and the fastest was by far an 8ft flat bottom jon boat. Sit on the deck rather than the seat and get as far forward as you can. Also have a 9 ft inflatable that struggles to get on plane as the floor isn't rigid enough as mentioned above. Inflatable is def the best bet for stability though.
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Old 01-10-2019, 02:02 PM
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Originally Posted by hnmoss View Post
https://www.soloskiff.com/faq/

HOW FAST WILL THE SOLO SKIFF GO WITH AN OUTBOARD ?

The Solo Skiff will plane with a 160 pound passenger and a 2.5 Hp Motor. The approximate speed will vary but around 8-9 mph.
The speed is about 12-13mph with a 3.5Hp, and speed with a 5Hp approximately 16-17 mph. Speeds all depend on passenger weight.
Wonder if a Torqueedo would get that up on plane? (Torqueedo) About 3HP and about 1 hr runtime on each battery.
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Old 01-10-2019, 02:49 PM
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canoes are not planeing hulls. Takes too much hp to get them on top. You will not plane with a 3.5 on any traditional boat unless a 4 yo is driving.
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Old 01-10-2019, 02:54 PM
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Solo Skiff looks great but it is only rated for 1 person.
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Old 01-10-2019, 03:21 PM
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You guys are really kinda hitting the extreme on the HP and speed aren't ya?
Better check the transom first.
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Old 01-10-2019, 03:30 PM
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Talking you can go a bit more rad...

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Old 01-10-2019, 08:44 PM
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Came across this video, powered by the same 3.5 Tohatsu my buddy has:


You think the Solo Skiff would keep up with that?

And yes, I am fully aware of how goofy this thread is. Thanks for the replies!
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Old 01-10-2019, 11:00 PM
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According to a Porta-Boat brochure I have, the 12ft version with a 3.5 hp will plane and do 6 to 8 knots with 1 person (doesn’t stipulate weight). I don’t know if the 8 or 10 ft versions would be any quicker, although I seem to recall that the 12 ft version is the most efficient.
My 12ft Porta-Boat will do 13.5 knots with a 6hp 2st Yammy. It's a hoot!

Last edited by Borrert; 01-10-2019 at 11:28 PM. Reason: fixed conversion
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Old 01-11-2019, 03:22 AM
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Originally Posted by jobowker View Post
Unfortunately, no. Inflatables in that range generally won't plane with a 3.5. The bottom has a little too much give.
Even going to a 3.5hp 2 stroke, with a replacement lower pitch prop, overinflating the tubes, and using some pvc pipe to hold the tiller so you can fit in the very bow, wind and small waves going in a favorable direction, you still only have a 50/50 shot at getting it to plane.
An inflatable keel is the key. Unless you're quite heavyweight yourself, 3.5hp two stroke gets it on the plane. My 10ft inflatable (inflatable keel with wooden deck) very nearly planed with 2.5hp. With 5 it flew - with the 9.8 I actually have on it, it bombs along very nicely.
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Old 01-11-2019, 03:38 AM
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Originally Posted by TTaxi View Post
Yeah , Baby!! I built a "MiniMax" hydroplane from Popular Mechanics plans back in jr-high wood shop. That was fun. It would fly even with a 3hp Evinrude. Wish I still had it. There were 4 glassed-in water-tight flotation compartments.
https://www.youtube.com/watch?v=gqTcuUMCwh0 ( 4 hr build in 8 minutes)

https://www.google.com/search?q=mini...990oCjVgqWMDM:
Mine was red with white stripe.

Highly recommended easy project guaranteed to put a grin on your face.

i think I am going to buy stock in drywall screws.
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Old 01-11-2019, 06:21 AM
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Originally Posted by jobowker View Post
Unfortunately, no. Inflatables in that range generally won't plane with a 3.5. The bottom has a little too much give.
Even going to a 3.5hp 2 stroke, with a replacement lower pitch prop, overinflating the tubes, and using some pvc pipe to hold the tiller so you can fit in the very bow, wind and small waves going in a favorable direction, you still only have a 50/50 shot at getting it to plane.
I could get the Johnson 3.5 2-stroke to plane my 8.5 foot inflatable consistently IF I pushed down on the bottom with my foot just at the right spot to make it rigid enough to climb over the bow wave. Been a while but as I recall the sweet spot was typically just in front of the thwart seat. One of the great measures taken to eek more speed out of the inflatable.
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Old 01-11-2019, 06:25 AM
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Originally Posted by Whaler27 View Post
I could get the Johnson 3.5 2-stroke to plane my 8.5 foot inflatable consistently IF I pushed down on the bottom with my foot just at the right spot to make it rigid enough to climb over the bow wave. Been a while but as I recall the sweet spot was typically just in front of the thwart seat. One of the great measures taken to eek more speed out of the inflatable.
Which is just about what an inflatable keel does.
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Old 01-11-2019, 06:41 AM
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Originally Posted by Clinker View Post
Which is just about what an inflatable keel does.
Exactly, just my inflatable didn't have an inflatable keel so I used the "foot keel".
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Old 01-11-2019, 06:43 AM
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Keep threads like this coming.
My 67 year old Mercury mark 5 planes my daughter and I (260 lbs. live weight) in her Mini Max at 24 mph.
Check out 2:50 in the video. Sea gull racing. That's an oxymoron if I ever heard one.



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Old 01-11-2019, 06:59 AM
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Originally Posted by Fatbill View Post
Do you by chance know if it was the Tohatsu/Nissan two stroke with or without forward shifting? What prop you were using? That speed seems incredible considering that is what people seem to be claiming 5hp will do.
It was a new 4 stroke and whereI live on an island Im sure I had the wind and tide to my advantage, Do not even consider the Tohatsu/mercury/nissan they suck. Get a Suzuki.
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