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Fastest boat with 3.5hp?

Old 01-09-2019, 07:08 PM
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Default Fastest boat with 3.5hp?

Asking for a friend. What's the fastest boat you can plane with a 3.5 two stroke Tohatsu?

Off the bat I'm thinking maybe the Porte Bote. I think he may want something a little more rigid and simpler though.

Qualifications are:

Can't be made in China
Has to be simple
Has to be able to plane at 2/3 throttle with 1 person
Can't be chincy

Let me know your thoughts!
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Old 01-09-2019, 07:16 PM
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Square stern Coleman canoe
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Old 01-09-2019, 07:20 PM
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Maybe a small inflatable 7-10ft dingy? Some of them can be downright quick with low horsepower. The little SOLO skiffs are pretty cool too.
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Old 01-09-2019, 07:24 PM
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Here you go.


https://www.soloskiff.com
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Old 01-09-2019, 07:25 PM
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2 pieces of HD 1/4” ply. Made into a hydroplane . Like we built as kids
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Old 01-09-2019, 07:26 PM
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Solo Skiff
Gary beat me by 2 minutes!!!
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Old 01-09-2019, 07:54 PM
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Originally Posted by Vitalsigns View Post
Solo Skiff
Gary beat me by 2 minutes!!!
And you can tow it with a Prius or a Rav 4!
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Old 01-09-2019, 07:55 PM
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My brother and I had a 12' sears jon boat, 3.5 hp Chrysler air cooled.
With one of us aboard, and sitting in the center it would plane at WOT.
Of course that was over 40 years, and 100 lbs. ago!
The smile on our faces was priceless.
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Old 01-09-2019, 08:00 PM
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Got a 2.5 yami on my 18' canoe and I get 12mph. Squareback would plane nicely I bet..
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Old 01-09-2019, 08:06 PM
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I have a 40 year old 14 ft jon boat with a 3.5 merc. Planes out if I balance the weight and runs at the speed of smell. Not about the speed. But we do catch a few catfish.
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Old 01-09-2019, 08:12 PM
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Porta Bote - done that many years ago with a 3.5 Johnson. Amazed at how fast it went and I think the 3.5 could have been underpropped.
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Old 01-09-2019, 08:17 PM
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9.4' watertender with 3.5 tohatsu = 8-9mph so not my dinghy.
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Old 01-09-2019, 08:30 PM
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Boost the hp to 6 and then you talking planning !!
I used to make a small 7 foot clinker fiber glass dinghy and my son used to race around the shallows in it and it planed no problem !,
Funny there was never ever petrol in the mower !
He even learned to old art of syphoning petrol out of the cars and mixing his own oil !
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Old 01-09-2019, 08:31 PM
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Inflatable boats! 7~9 ft.
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Old 01-09-2019, 08:39 PM
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Originally Posted by fireisland1 View Post
2 pieces of HD 1/4” ply. Made into a hydroplane . Like we built as kids
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.
( 4 hr build in 8 minutes)

https://www.google.com/search?q=minimax+hydroplane+plans&rlz=1C1CHBD_enUS 736US736&tbm=isch&source=iu&ictx=1&fir=U990oCjVgqW MDM%253A%252CVqubLTUpVzSumM%252C_&usg=AI4_-kQzzJOyAbWZI6sPoQdJ1HVB-78LZA&sa=X&ved=2ahUKEwjh2PjpouLfAhWJZd8KHVLPA1AQ9Q EwD3oECAQQDA&cshid=1547090972988001#imgrc=U990oCjV gqWMDM:
Mine was red with white stripe.

Highly recommended easy project guaranteed to put a grin on your face.
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Old 01-09-2019, 08:57 PM
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I have a 9'6" air floor inflatable which weighs about 60#--I weight about 180 lbs--I use a 3.5 hp Merc 2 stroke as one of the dinghy motors---it goes about 8 knots top speed--not really planing however. You need very light weight--and well developed bottom surfaces to plane with that HP--and at that you are running the outboard WOT all of the time.... Not practical.
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Old 01-09-2019, 09:46 PM
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Minimax are great, multi generation tradition to build them in my family. Mine had 9.5hp and ran about 30. Wil build one with my son in about two years.

But I suspect he’d like something more useful, like a Lillistone Fleet.

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Old 01-10-2019, 05:44 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.
4 hours in the garage and you can have another one, is their any kind of racing class for this boat? that would be bang for the buck most fun you could have with your pants on.
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Old 01-10-2019, 06:31 AM
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Originally Posted by KVKV View Post
Inflatable boats! 7~9 ft.
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.
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Old 01-10-2019, 07:46 AM
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Originally Posted by Gary999 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.
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