Brig F360HS with Johnson 75hp

[reinier]

I'm busy fitting a Johson 75hp 2-stroke 3 cilinder on a Brig F360HS. Last year it was fitted with a Yamaha 40hp 2-stroke, tiller-steered. I've already built in the jockey-seat with gauges and the hydraulic steering. I've also put the engine behind the boat. Last things to do: connecting the wires from the gauges to the engine, and fitting the gear and throttle cable on the engine. The prop is a 13,5" x 24" Raker, I'm curious about it's performance on this setup. The engine's cavitation-plate height is 3 inch above transom height.

[reinier]

Some extra pics:

[Nos4r2]

I thought your profile was a joke. Jesus. When do you want us to call the lifeboat?

Your hull is rated for 30hp. It's going to either flip, sink or fall apart.

[reinier]

Originally Posted by Nos4r2

I thought your profile was a joke. Jesus. When do you want us to call the lifeboat?

Your hull is rated for 30hp. It's going to either flip, sink or fall apart.

It's actually rated up to 35hp and 105kg, my plan is to make the transom somewhat stronger. The engine weights 90kg. It's not my intention to take the boat out on big waves and seas, but in small, flat water, for some high speed runs. With the 40hp tiller steered engine the boat was very stable, even on waves, so with a bit of practice I think I can handle the 75hp on the flats.

http://youtube.com/watch?v=kvC9hnIPg0I

--> this is with the 40hp, boat hitted 45mph GPS with 2 people and some equipment, fuel etc. on board

[Nos4r2]

Originally Posted by reinier

It's actualle rated up to 35hp and 105kg, my plan is to make the transom somewhat stronger. The engine weights 90kg. It's not my intention to take the boat out on big waves and seas, but in small, flat water, for some high speed runs. With the 40hp tiller steered engine the boat was very stable, even on waves, so with a bit of practice I think I can handle the 75hp on the flats.

--> this is with the 40hp, boat hitted 45mph GPS with 2 people and some equipment, fuel etc. on board

You're still dicing with death-what you're doing is the equivalent to me putting 200hp on my Searider.
Buy a bigger hull. Apart from that, your insurance will be invalid.

[prairie tuber]

Kinda reminds me of this (fictional) story;

http://www.darwinawards.com/darwin/darwin1995-04.html

[freek W]

Hee Reinier

The guys here are´nt actually positive about your setup
hehe
I'm looking forward too see the results

and yes I actually also do think that it might be a little dangerous but if you can controle the throtle, nothing will go wrong

[Nasher]

Without sounding too negative, as I've tried this sort of thing myself in the past, and we all have to learn, I'd have put that console further forward to balance the boat out.

I think you may well have a very fast boat, but one that is not as much fun as it used to be because you have ruined the handling.

Good luck

Nasher.

[reinier]

I understand your doubts... I hope it will drive a bit better than you all expect.

There will be fitted some extra stringers on the transom, and a sort of box. Also there's going to be a setback behind the boat, so the engine can be mounted higher... The prop shaft in line with the boat's bottom is best i guess.

[Neanderthaler]

Reinier why don't ya put a seat on the engine, and forget the rib, then you wil go a lot faster..

See you on the mega meeting

[fred bolton]

nice steering wheel

[reinier]

The boat is ready for a flight tomorrow, so I'll keep you updated with pics/vids.

[dverstege]

Was your first trip out the last? Did the boat hold up?

[matt h]

Matt,, you got a good idea there!! 200 horses on a searider!! hmmm

[Hightower]

Nothing wrong with experimenting, just do us a favor and start off with some slow steps. I too would be interested in how she performs, just remember that you don't have to use all that power.

This reminds me of when I had a 14' simulated clincker row boat with a 40 evinrude tiller circ:1966 on the back, I don't think I ever opened her up to full thottle. The floor used to move with the impact of the waves I was hitting. And it was kind of satisfying going faster than bigger boats with bigger engines, but I knew the limits and never exceeded them.

Good luck

[reinier]

Ok, there are made some changes on the transom and jockey seat. The boat is now equipped with a setback and a foot throttle... We took her out for a small trip on flat water yesterday. We reached in excess of 55mph on the speedo, but the engine is mounted to low. We will lift the engine 3 or 4 inches and I expect some extra performance out of it. The boat is not easy to handle, but it's not impossible, on flat water I don't feel like doing something very dangerous.

[Hugh Jardon]

well i am sure you will have a lot of fun testing it out, but take care as water can be very unforgiving at high speed. get someone to take a vid of you going by, would love to see the results

cheers

[reinier]

Originally Posted by Hugh Jardon

well i am sure you will have a lot of fun testing it out, but take care as water can be very unforgiving at high speed. get someone to take a vid of you going by, would love to see the results

cheers

Yeah off course we'll take care!

This weekend we make some vids @ high speed from inside and maybe outside the boat.

[reinier]

We've had some problems with the jack plate couldn't handle the engine... But it's fixed now. The engine is lifted higher, in order to get more RPM's and improve the handling. I'm curious about the results, the center of the prop shaft is now 2" below the transom. I'll keep you updated with pics/vids.

[reinier]

Some vids we made today:

http://youtube.com/watch?v=tphVBqLx1nM

http://www.youtube.com/watch?v=phL8xxWeJOY