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Old 15 February 2019, 16:04   #21
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Originally Posted by trevpiee View Post
He gave me a deal on a hypalon boat... only catch was the material he had left is yellow So I am going yellow with black trim. I'm still undecided on power. I am big on portability and packability. Really thinking about the yami f25.. only weighs 130lbs


Is that the 3.8m in yellow hypalon?
Rather than the 4.1m
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Old 15 February 2019, 17:50   #22
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That will look smart, you should call it Bumblebee
I think after a while you will get bored and want more power, they raced them with Yamaha F40's in France for a while.
When don't you want more speed?
I worked out how to handle the weight of the motor with out it being a hastle. I have a folding trailer and a cheap electric hoist i hang from my garage door arch. I spend 1 hour building my boat completely ready to go, on the trailer. This I can store in my garage all summer then dismantle in fall and its gone till summer again. I could do this for individual boating trips too but I go out for 2-3 days at a time. Not for the afternoon like he might.
Now for me I had a 40 on mine the first year and it was a big disappointment.
I sold it (thank god it was used when I bought it) and bought a 60 etec. Now I love my boat.

All that said, Roflhat, the spec sheet on the SurfCat says 130lbs is max engine weight.
Have you seen a 50hp with the 130lbs weight limit? My motor is 240lbs same as 40 & 50hp etec. Just at Futura max weight.
And I looked at the 2018 Yamaha lineup and don't see the Square cowled models all you guys run. Is that an older model that the Holy Grail of racing outboards?
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Old 16 February 2019, 09:32   #23
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I've never seen the Surfcat spec sheet say 130lb or any weight I don't think, on the Ceasar site it says max 70hp.
The tohatsu 50d2 is 72kg in short shaft, the yamaha 50 2 stroke will be around the same, my 70ces will be slightly heavier but not much with the electric start, power trim etc. all removed. You can still get the Tohatsu and Yamaha 50 2 stroke new but only for commercial or racing use over here anyway. I think used ones are a lot harder to come by over in the states, especially the tohatsu. For racing you really want the simplicity and light weight of the yamaha or tohatsu, if you flip they are easy to get going again
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Old 16 September 2023, 19:07   #24
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You can go direct to Jacques, he's a nice guy and can help you out with shipping etc.
The quality is superb, and if you store them inside they'll last a long time too. They are prone to fading in the sun, best kept undercover or indoors, same as any other PVC inflatable. They're best stored with some air in them, around half pressure
Another alternative is the Gemini GRX Surf I think it's called. 4.2m long, a bit heavier and more durable than a surfcat and probably not as sporty but made in hypalon.

Can't really say whether or not bow rise is better/worse, if you want to go fast then less boat in the water is the way to do it but they are stable upto 60mph.
I like to keep as much weight as possible aft, if you're going above 50mph you do have to be careful going flat out, especially into the wind as they do tend to lift.
Hi Rolf I've just fit a second hand surfcat, 50 hp toahatsu an only getting 35 knots with 2 people on board was expecting a bit more. Any advice on trim position etc. Thanks Robin
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Old 18 September 2023, 06:57   #25
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Do you know what prop is on it?
With a decent 14 or 15p stainless prop you should be getting 40-42 knots
Hard to advise on trim as the angle on the transoms varied over the years, but looking at the boat from the side the engine should be close to perpendicular to the boat, you don't need much trim as the boats generate bow lift anyway
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Old 18 September 2023, 07:58   #26
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Morning, thank you for taking the time to reply. I can see you help so many people out.

I think maybe the motor needs rasing as the prop nut is below the centre of the high jacker . I'm not sure what prop size it is, I have attached some pics.



https://photos.app.goo.gl/BD4qXncXFqrAPTVRA
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Old 18 September 2023, 11:59   #27
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Looks like a 15 pitch powertech semi cleaver, which should be good for 40 knots. I'd start with the centre of the prop shaft 10mm above the bottom of teh hijackers, you can run string around the boat to measure. I'd do that and then go and try different trims to see what feels right, you want to get the whole boat out of the water that's how you get the speed
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Old 18 September 2023, 12:29   #28
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Thank you very much. I've ran a piece of string. It looks to me as prop shaft is just below the valve. If I raise it due to the holes in fge motor mount it would be by 30 mm. I've updated pictures in the above link. I've used some tape to highlight the string. Thanks for you help. Let me know what you think.
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Old 19 September 2023, 06:59   #29
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If anything I'd go down 10mm but I reckon engine height is fine where it is.
Have a play with different trim settings and see how you get on, you want all the weight towards the stern in the boat. Also make sure your tubes are hard enough, you want 6 psi in the main tubes and 12psi in the speed tubes
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Old 19 September 2023, 07:04   #30
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Morning, thank you will play with the trim on Saturday and see what works best for my weight etc.
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Old 23 September 2023, 13:23   #31
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Afternoon, hope you're having a good weekend. We'll I wrapped up and went out this morning for play. For me the 3rd hole seems to best on trim setting for top speed and control. Got 37.2 knots with myself, passenger and 35 ltrs of fuel. Took your advice and got the passenger to move back gradually. Having them back towards my foot strap is where I got the most speed. Wasn't the flattest of days but confident I'll get to 40 knots. Thanks for all your help.
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Old 23 September 2023, 16:07   #32
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I used to get 40 knots out of my Surfcat with a 40hp yam on it. Best pin position was the 1st hole. That was hitting the rev limiter with a 15 prop.
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Old 23 September 2023, 19:10   #33
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I need to get a tachometer installed, just trying to get one that's not over the top expensive. Was that 1 up or 2 up ?
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Old 23 September 2023, 21:31   #34
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I need to get a tachometer installed, just trying to get one that's not over the top expensive. Was that 1 up or 2 up ?


Same speed with both, I hit the limiter both 1 and 2 up
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