Built an electric jetski

[Quinc]

I mostly just read the forums, but figured some of you might get a kick out of this. Also any tips on what to paint the bottom of the hull with to reduce friction?

Built this over the winter with my 8 year old. He took every nut and bolt off the ski and did the fiberglass! So please give him a like and sub on youtube.

Ski ready to ride weight is 226lbs. Battery weighs 35 pounds! Once I figure out if I want to stay with sprockets or swap to coupler I will shave some weight off or maybe go to aluminum engine mount. Also thinking I can cut out the hood liner for a few lbs.

Specs:

• QS-120 motor 2000w / Maximum Torque: 20N.m to 49.6N.m. (more info on motor and controller specs)
• Votol em-100 controller
• 72v lithium battery capable of 800amp peak power.
• ANT 300a bms

Ski 1986 300sx

Skat 16 impeller
Motor sprocket 14T Driveshaft sprocket 10T (Did this so I could adjust rpm/torque with sprockets)

Still trying to Figuring out the rpms Vs Torque for a jetski.. I also have a Skat 15 and PJS 17 impeller to try. In the video I think the top speed was around 15mph.

Cool thing about it is you can adjust 3 separate speed settings so when my 4 year old rides it I can keep the speed around 10mph for him.

If it turns out to be awesome I will probably try the 8000w motor next.

 

[Grub54891]

Go with cogged belt drive.

 

[Quinc]

Go with cogged belt drive.

Looked at that as well. But the plan is to go with the skis original coupler with rubber bisket. Just need to drive 90 minutes to where i have access to a lathe so I can hopefully make it work.

Also your Signature is great!

 

[Quinc]

Top speed run hit 25mph. Even got my big arse up out of the water this time. Going to try a coupler next. Hopefully get her up to 30mph.

 

[Scott06]

Very cool , i was wanting to do the same conversion. Do you have any idea how long the battery lasts ? Was also thinking a set of pulleys to be able to play with gear ratio . I was assuming that a electric motor would need an overdrive ratio to keep impeller at or near same rpms as the two stroke would have ?

 

[Quinc]

Very cool , i was wanting to do the same conversion. Do you have any idea how long the battery lasts ? Was also thinking a set of pulleys to be able to play with gear ratio . I was assuming that a electric motor would need an overdrive ratio to keep impeller at or near same rpms as the two stroke would have ?

Battery we get about 20 minutes so far its also only 16ah. I have a second battery i am building so we can swap them out. I also have a 72v 34ah battery in my Sur-ron I might try. This motor is programed for 6500 rpms. However, my thought is with the over drive I am currently running it cant hit it. so going to try direct coupler next and see if it will spin 5000+. If it does hit the 6500rpms I will go up from 16pitch impeller to 17pitch.