SIB performance

[mark_j]

At risk of thread creep, but would be interested to know what the aerotec 380 will do with 25hp vs the 15hp?

[Flyguy]

16mph on the GPS on Zodiac FR 340 with a Tohatsu 9.8 2stroke. Certainly fast enough for me.

[C-NUMB]

Finaly had the time to complete the transom mod(+5 cm), sea trial today. Plan was to do it with my new 13 pitch Turning Point prop, but that failed, prop has a casting error, its not symetric(touches the gear case in a certain position.

So had to do it with the original tohatsu 11 inch. Acording to my car navigator, reached 43 km/h (23 knots)with 2 persons, otherwise light load. Pretty much what expected, boat handling well, but had too low preasure in the air flor, it was moving a lot.

Expect to get abt 27 knots with 13 pitch, and dont think need more than that anyway.....will revert when getting a replacement.

[Derisher]

Originally Posted by mark_j

At risk of thread creep, but would be interested to know what the aerotec 380 will do with 25hp vs the 15hp?

I have an aerotec 380 with a yamaha 25 hp 2 stroke and the best I have seen on my car sat nav is an average of 29mph on a 2 way run. That is with the engine raised about 13 mil off the transom

[MikeP]

Hi guys,

New datapoint to consider...

Previously, I've seen a maximum of 7 mph with just me, a fuel tank and a kit bag. Last week, we've had some builders in doing some plumbing stuff, and I noticed that one of the pipes they had offcuts of was a perfect diameter to jam onto the end of our 4HP Mariner throttle.

The result was I clocked 13mph at full throttle simply by virtue of using the tiller extension to sit further forward in the boat.

So that's 4HP, 3.1m boat, single passenger with fuel tank and kit bag, but with all movable weight forward.

[vadimb]

14 Pitch prop 10 1/8" diameter
2 people, 15 gallons of gas and light fishing gear for a day: 22-24 MPH on GPS.

[azzurro]

I guess cat hulls (such as Futura an similar) and high presure floors perform better because of vibration. The surface in contact with the water vibrates a lot in a inflatable keel boat such as mine. So comparing different kind of boats is useless.