Help! with outboard setup

[Go Gecko]

I have recently taken delivery (after 13 week wait!) of a new Horizon Safari 415 open tinnie powered by a Yamaha 30 2 stroke tiller steer. I have had the boat on the water twice for a total of 2hrs running in time and have experienced an extreme amount of prop cavitation, both turning and in a straight line in moderate seas. I have tried the motor on every trim position and the best seems to be when the motor is trimmed right in to the transom. While this reduces the cavitation, it makes steering a bit more difficult as the motor is trying to push the bow down. The guys at the boat yard I purchased the boat from say that this is the best position for the motor when I am the only one in the boat (I weigh around the 120kg mark). I have eyeballed the cavitation plate and the hull and I would say that the plate is dead level with the hull. Anyone have any ideas or suggestions?

[seatime]

can the motor be dropped one hole or an inch to see if it helps. otherwise demand the sales staff come for a run to see for themselves what type of rig they are selling.

Steve

[FISH 4 DINNA]

Would a permatrim help ?

[Go Gecko]

can the motor be dropped one hole or an inch to see if it helps. otherwise demand the sales staff come for a run to see for themselves what type of rig they are selling.

Steve

Thanks gelsec,
Dropping the motor down was one option I was looking at, I am taking the boat back to the dealer this weekend for them to see if there is any underlying problem that could be causing this.
Cheers

[Go Gecko]

Would a permatrim help ?

My last outboard had a set of LZ foils fitted and I could not fault the performance of the boat and motor. I would seriously consider fitting these or one of the other foils to this motor.
Cheers

[Spaniard_King]

Gecko,

You need to get the outboard to it's optimum setup before going for a foil otherwise you will never get the best out of the boat.

[zaraspook]

i have a horizon with a merc and foils and found it only cavitates under extremly tight turns

[shandos]

I agree with Spanaird_king - a foil should be added only as a final measure -- 120 Kg near the transom in a 4m+ plus boat I would have thought cavitation would not be a problem unless something is basically wrong. Do you have the correct size prop fitted? -- if so then dropping the motor a notch would seem to be in order.

Regards
Shandos