tohastsu 50 hp needs to go faster

[lukewhiting]

Are you pumping it to the right pressures? Too soft and it won't have the rigidity. I pumped my main tubes to 0.4 bar and hyjackers to 0.8 bar. That's what a racer told me they all did.

[itrjoel]

ya there pumped up

[itrjoel]

would a 11 1/4 x 18 be any good hard to find these props

[Roflhat]

Yep that's what you're after. That's a Ron Hill prop, cheaper than a genuine mercury or yamaha prop. They're a bit of a gamble as I've said. I'd go for it, try it out, if it vibrates a lot or doesn't perform like you want it to send it to a prop tuning company.
I'd get it scanned, see what the true pitch is and have it balanced so all the blades are equal. If it's slipping you can add some cup.
Once they're tuned they are very good props. Saying that you might get lucky and get one that's good straight from the box. Either way I would get it tuned, they still represent good value for money.

[itrjoel]

where do i look for genuine cleaver prop thats the only one i could seem to find.

[itrjoel]

is this a genuine one .?

[itrjoel]

or is that the same

[Roflhat]

They are genuine cleaver props. Just that they're made by Ron Hill instead of mercury. I think he's Prop19 on eBay? Both the ones you've posted are the same
There's a forum called boatracingfacts.com where there's usually props for sale.

[itrjoel]

So got the prop tryed it to day still only getting like 46 mph

[itrjoel]

Not sure if it at the right hight and I need to get a TAC. seems like it gos a lil faster like a mph or 2 what's next : ( ...
How much psi should my hijackers have again ??

[itrjoel]

11 psi ?

[itrjoel]

Prop hight

[itrjoel]

Height

[itrjoel]

....dono

[itrjoel]

That rope is tied around the bottom of the hijacker

[itrjoel]

Few more

[Roflhat]

You want 6psi in the tubes and 12psi in the hijackers.
From your photos your engine height looks high enough, maybe even too high. You could try dropping the engine so the centre of the propshaft is in line with the rope. Then if you're not getting max RPM raise the engine up 10mm at a time until you find the sweet spot.
How's your trim? got any photos or videos of it going flat out? You need to get air under the hull to make it lift out of the water.
Looks like a nice prop by the way!

[itrjoel]

I just ordered a new tach. Mine broke.
I only had like 2 or 3 psi in my hijackers . my trim is second hole from the bottom .. Witch might not mean much I'll snap some more photos tonight. Starting to think my motor is a lemon

[Roflhat]

You want the hijackers rock hard, otherwise you'll end up rolling in the turns. What make of boat have you got?

[itrjoel]

Not really sure .. I'll have a look tonight low highjackers wouldn't nock my speed tho eh