West Marine PRU-3 Inflatable Boat with Tohatsu 3.5 HP Speed Fix

I had a bad surging problem with my new inflatable where it would ventilate air when trying to get onto plane. I tried raising the PSI of the tubes from 2.0 to 3.5, stiffening the boat floor, and looked for other solutions. In the end, I found a fix that raised the top speed from 6.3 to 9.9 mph - a 44% gain!
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[@Freddieready]

Nice video and a small recomendation just buy a small anchor and leave the dinghy in shallow water not touching the floor this will extend the life of your dinghy and not have any punture. Keep the videos coming 👍

[@svdellajean253]

I’m considering buying a Tohatsu 3.5 for my inflatable. Thanks for the video review and posting the link to the prop.

[@stevegreen54]

Your position in the boat will make a big difference. A telescopic tiller extension allows you to move up to 3ft forward. Great video, I’m off to buy some dolphin fins . Thanks.

[@TreeTopFlier]

I have a doel fin on my 18ft aluminium walk through with an 85hp outboard, came with the used boat. I decided to take it off to see if it made a difference. It does! A little higher top speed because I can trim more of the boat out of the water without porpoising. It's also more stable in rough water. As an added bonus it keeps swimmers off the prop and has been used as a step. Def try it on the Boston. PS still love the blackout ;-)

[@WaterTrails]

I think your video just might have changed my purchase choice for a dinghy to my sailboat. Thanks, there are few vids that take a minimalist approach to planing (getting on a plane with the most economical setup)!

[@craftbrewer5401]

Thanks. Just had a similar boat and same motor out for the first time today, and I have the same problem.

[@craftbrewer5401]

Changing the propeller didn’t do I for me. But I can’t get my self to drill holes to install the finn.

[@jamesparnell9893]

You should swap your carb with the 6hp carb and do another test. Great video.

[@marknewman6730]

Excellent video mate. Really useful.

[@BalkTutkusu]

really nice video, i have the same brand, same hp but 2 stroke one and i will try changing the prop, thanks👍

[@ABHALONEAVENTURA]

Very good boat and excellent engine I'm in love with boats Strong hug from Brazil

[@t.c.2776]

I know it's 2 years after you posted... but if you had cute a floor piece for the bow section of the dingy, that would have helped it plane better also...

[@Cryptony1975]

I have a mercury 6hp 4 stroke. Plenty of power

[@joedanvers1010]

Great, informative video. Thank you!

[@FrankLadd]

Great visdeo showing all the steps!

[@DennysCountryLife]

This dinghy isn't designed to plane, but you did a good job of making it do so! It's a full displacement boat. In order to plane nicely, you need a RIB "Rigid Inflatable Boat". That's according to the manufacturer anyway. They are fantastic shit-to-shore boats, for tooling around the marina, island hopping etc. Thanks for the video!

[@davidbuie3316]

Great video. I have this inflatable. Thanks for the very useful info.

[@svticklemefinn1176]

That dingy is not meant to plane. Thinking about one now it's on sale.

[@earnestborg9909]

I've got the 2.5 meter one, it's probably the best bang for the buck you can get....very pleased

[@NinoSpinner]

Very good !! with the aluminum propeller did you find that it goes faster?

[@rudyllamas3320]

What's the part number for the prop?

[@mrjams6140]

Mantap bro!! 😎

[@Francois_Dupont]

so the best thing was to change the propeller from plastic composite to aluminium? are they still the same size as the original one? 7.4inch x 5.7pitch ?

[@Mr.Fabrication007]

Its called hydrodynamics for things that move thru water, the doel-fins aren't supposed to act like an airplane wing or provide lift. Thats something completely different called a hydrofoil, which is designed to create lift and support the vessel weight. Not the same principals at all really, fyi... :(

[@jameslong2618]

Who else is thinking about buying an inflatable boat with their stimulus check.

[@glenstriper]

I did. Achilles lsi 104 lightly used!!

[@Cutlass_Rudd]

Get an older 9.9 2 stroke, they only weight a little more than that 3.5

[@grappighaha6830]

The fuel usage is much more than a 3,5 4 stroke

[@drfrank777]

Why do you think the new prop made such a big difference? Did it have a greater pitch? Can you compare the old and new with some numbers? Thanks!

[@3flgator]

Hey there. Have you had any issues with the PVC of the boat? Discoloration, punctures, leaks etc?

[@ZampostOk]

Hey that’s a cool watch!!! What watch is that???

[@unnamed9254]

Hey i have this but i have a 15hp mecury is that to much for it?

[@tomzhang8675]

Is that a 20" shaft one?

[@tomzhang8675]

Is that a long shaft one?

[@anduwasup]

Hi! Can you tell me the height of transom and lenght of shaft? I wan’t to get the same 3.5 hp short and I’m affraid not to get in same situation. My transom is 395mm.

[@davidkirksey8521]

That boat is not designed to plane IMHO

[@bushpig8109]

Does it also start in forward position or is than a gear save engaged?

[@ttxxdd]

Do these dinghys require short shaft or long shaft motor?

[@nealgreene6653]

Short shaft

[@pappysproductions]

@@nealgreene6653 Thank you

[@arkadiuszk.3898]

Is it 15" or 20"?

[@bobbylarotonda5674]

Where did you get the watch ??

[@robmanuli5630]

What’s the prop size

[@Dmoormans5]

What watch is that??

[@JERZEECOWBOY]

I wanna know what kind of watch that is?

[@rsilvers]

Garmin Fenix 6X.

[@ryanhenry21]

What is the length of the boat?

[@earnestborg9909]

3 meters

[@sendyamulet]

why do akl these vudeos spend fufteen minutes staring at the tail of the boat and telling stories about what you did after breakfast, leving us scrubbing forward to the bit where we actually see the boat and notor working. ??? people do not want to sit listening to woffle of ten minutes before seeing the content

[@samueljanes]

You may like this solution for that kind of motor: kzbin.info/www/bejne/fZ61YZuCYt6jsLc Regards.