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Old 13 April 2008, 19:46   #1
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Country: Netherlands
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Brig F360HS with Johnson 75hp

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.
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Old 13 April 2008, 19:48   #2
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Old 13 April 2008, 19:58   #3
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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.
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Old 13 April 2008, 20:08   #4
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Originally Posted by Nos4r2 View Post
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.

--> this is with the 40hp, boat hitted 45mph GPS with 2 people and some equipment, fuel etc. on board
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Old 13 April 2008, 20:12   #5
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Quote:
Originally Posted by reinier View Post
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.
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Old 14 April 2008, 01:51   #6
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Kinda reminds me of this (fictional) story;

http://www.darwinawards.com/darwin/darwin1995-04.html
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Old 14 April 2008, 10:19   #7
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Hee Reinier

The guys here areŽnt 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
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Old 14 April 2008, 11:52   #8
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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.
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Old 15 April 2008, 08:22   #9
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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.
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Old 15 April 2008, 11:44   #10
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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
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