Where did the 70 - 100 hp come from, 150 lb isn't an aircraft carrier.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

You can start by looking at https://www.amazon.com/Dive-Scooter/s?k=Dive+Scoot...

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm

If you can consider an engine you may consider one of these:
https://www.amazon.com/s?k=electric+fishing+motor&...
By the way, there may not be many 2 stroke engine setups on the market any more. Efficiency and pollution concerns.
There are still a lot of four stroke engines out there.

Bill
--------------------
Ohm's law
Not just a good idea;
It's the LAW!

Something like that exists.

HP and torque are different things. Lots of torque at very low speeds doesn't make for much HP.

The cable/speed control isn't part of the motor, it's the controller you pick. A cable would just move a potentiometer so might as well put the potentiometer right at the control point.

The emphasis on submersion seems misplaced; outboard motors are not submersed.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm

Trolling motors do have the motor submerged.

WaterFreak,

What do you mean by waterproof?

If you Google "motors ip66" and/or "motors nema4", you will find motors that can be safely sprayed down with a powerful hose. They will be weatherproof.

If you Google "motors ip68", you will find motors that are submersible.

A motor catalogue or web page ought to show you the specifications for speed, torque, power and required cooling. If it doesn't, and you buy the motor, you are encouraging everyone else to not provide the information. Please help us all out.

--
JHG

Think this should be in a hobby forum somewhere on internet as I doubt it's a student posting anyway - it's a dis-jointed ramble and the OP hasn't bothered acknowledging any posts so far.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

70 - 100 horsepower comes into play as thats what the 2 stroke engine I could put in the hull would be,

The motor itself will be attached to jet pump that will be in used for propulsion

So a trolling motor won't work unfortunately,

The motor needs to be able to be waterproof for the reason that if water gets into the engine bay itll drain through drains but the motor will still get wet

I am student of this topic

Also preferably would like to buy said motor if its possible in Canada

https://canev.com/

WaterFreak,

Add "Canada" to your Google searches.

I see you are from Saskatchewan. There are vendors like A1 Electronic Parts located in Toronto, Ontario. They have a website, they do mail order, and they support hobbyists. There may be somebody similar in your neighbourhood.

You want to place a battery, connections and an electric motor that can put out 100HP 75KW into a boat that may sink or capsize. Either you comply with IP66 and IP68, or somebody is going to get hurt. Over the weeks, months and/or years in which your boat exists, you need to remain in compliance. If/when your boat ceases to comply, you need to dismantle everything so that nobody can use it.

I am not the go-to guy for electrical safety in water. If you aren't either, you need to talk to someone who is.

--
JHG

For an 8D battery assume 300 Amp Hours at 12 Volts. Weight, about 170 pounds.
Cost, $700 to $1000
300 Amp x 12 Volts = 3600 Watts for one hour.
100 HP = 74600 Watts
or 174 seconds per charge.
if you want to run for 10 minutes you will probably need over 600 lbs of lead acid batteries.

Bill
--------------------
Ohm's law
Not just a good idea;
It's the LAW!

Motors put to water. Love this guy.

There are about a thousand e-boat videos - is an outboard

Keith Cress
kcress - http://www.flaminsystems.com

There seems to be some misconception or an error in conversion somewhere. It doesn't take 70 or 100 HP to move 350lbs through the water.

Rod Smith, P.E., The artist formerly known as HotRod10

Quote (Rod)

There seems to be some misconception or an error in conversion somewhere. It doesn't take 70 or 100 HP to move 350lbs through the water.

Agreed. The poster's wants and specifications seem to be slightly diverging from reality.

Bill
--------------------
Ohm's law
Not just a good idea;
It's the LAW!

Wow, Keith. I didn't realize how long I had been away from speed boats.
Please disregard my recent post. It refers to outdated technology. Sorry fellows.

Bill
--------------------
Ohm's law
Not just a good idea;
It's the LAW!

The reason I list the horsepower is because the only number that the twostroke engines that usually power the hull im using normally are about 70-100hp(they dont have list torque outputs or anything else)

The weight of the twostroke engine setup is no more than 100lbs if its not possible to be that light thats fine i can simply stick with the to 2stroke setup,

All i would need is a motor, a battery pack, and controls that can controlled throttle wise by a cable, the hull has everything else already covered

I underatand itll be heavy but if its heavier than the initial two stroke motor then i will pass on it, if you dont know or think i should post this somewhere else i can do that.

My question is simply, is it possible ?

Anything is possible if you throw enough money at it and it's not a fairy tale requirement.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

WaterFreak,

I thought the whole point of two‑stroke motors is that they are light for whatever power it is they are putting out. Powerful electric motors are light. Batteries are not. Electric power is not a way to save weight.

I would guess that just about anything you replace a two‑stroke motor with will be more environmentally friendly.

--
JHG

Quote:

doesnt need to be very fast

Quote:

be able to move 200lb hull and atleast 150lb person on said hull

With these requirements, sure it's possible. Again, a trolling motor and a big battery will easily move that weight around for a pretty long time.

Quote:

The weight of the twostroke engine setup is no more than 100lbs

Not from what I'm seeing.

50HP Yamaha 2 stroke outboard - 75kg = 165lbs

Yamaha 70hp 2 stroke outboard 105.5kg = 233lbs

The 70HP motor weighs more than the boat, and is typical for a boat 10 times the weight of yours.

"The rule of thumb is based on weight alone, and says you should have between 40 and 25 pounds of weight for each horsepower."

Rod Smith, P.E., The artist formerly known as HotRod10