Twin jet 13ft

I have been building a Kevlar / glass ski boat 3.5 metres long it has twin 80 hp triple cyl 2 strokes powering it, the motors and jets are all alloy and weigh 60kgs each. Start of project

 

Here is a pic of the engines

 

A pic from the back of the boat

 

The jet install

 

2 stroke on the bench.

 

Single or twin installations in small boats !! which is normally the faster of the two ?? a single 160 hp or your twin 80 hp and why ??

 

3 people with a bench seat and a spoiler to be added

 

Well originally was going to put one in, but had a deal to good to pass up so let's have a play. Should turn good!!

 

The hull was doing 60 mile hr with 75 horse outboard

 

SO WITH ONE 80 HP JET HOW FAST ??
WITH 2 X 80 HP JETS TWICE AS FAST ??

 

2 stroke jets don't develop the same torque as a 4 stroke. Top end speed is good
, it does not mean twice as fast. Have only had the engines running on the boat while still on trailer in the water. Still need to complete steering. I will update when how fast it goes in the next few weeks.

We will have plenty of thrust and torque to pull a skier with 2x 6" jets.

 

The thrust on the trailer was very promising

 

Unfortunately I'm unfamiliar with jets in general...could you give me some more details on these units. I'd like to power a flat bottom river skiff and I'm looking for powerplant options.. these look perfect.

MM

 

I would say go for it just use a second hand jet ski pump and motor combination 700cc would be fine for a single person 9ft boat . We're you thinking twin or single? The thing with fitting into an existing hull would be fitting the pump into the stern of the existing hull but not to hard. Do you have more details of the boat?

 

Very cool! Where did you get the motors and jets from?