Poseidon 470

markmalta · August 26, 2016, 19:13:22 CET

malvizz, have you tried talking to the guys of Petecraft? I'm pretty sure that a solution does exist..

redhead · August 27, 2016, 16:27:26 CET

WOT simply means wide open throttle. Gas down bil- Malti !

5200 is low for an etec. It means it is struggling to turn that propeller. Leave everything as it is and fix the other smaller propeller. This should solve your problem. If not, go to petercraft and demand why this is happening. A 14ft boat with a 50 etec should plan without problems with 3 or 4 people aboard.

malvizzu · August 27, 2016, 18:45:45 CET

@Napuljun / Markmalta / Redhead - Great video. That Poseidon surely flies. True I'm not happy with performance and having great difficulties on WOT (thanks redhead). Again this morning only my father and myself. At one point he was sitting at the back and couldn't get the boat down and engine's noise was like revving all the time. Also ETEC seems like dipping in water at high speed. When he went up front, boat handled better.

Yes I did speak to Petecraft brothers and Mario offered lifting engine to it's maximum and do some sea trials. Most probably will take up offer or maybe before that instal hydrofoil and than smaller prop.

Thanks guys.

skip · August 29, 2016, 12:20:37 CET

You're 'killing' your E-TEC by bogging it down with that prop.....get yourself into a safe REV range. You can't keep adding weight to the boat (Aux) etc and expect to keep the same prop.

On smaller boats, weight distribution is very important. You have a lof of things at the stern of the boat and you will probably find that the engine anti cavitation plate is under the water when you are running rather than being on top. When you shift the weight towards the bow you are allowing the cav plate to be on top and the engine to perform as it should.

Move as much weight as you can to the bow
Raise the engine and test to see how the boat performs and what your max revs are,
if still low: Reduce the pitch of the prop and consider a non raked prop with larger blades to carry the weight of the boat.

Whilst a hydrofoil adds lift it also creates drag so bear that in mind.

To the OP, for whichever boat you're considering, make sure you go out and test it before buying and also try and simulate your typical load to help you get an idea of how the boat will actually perform.

If you take a 'stock' 14 footer, 40-50hp and std fuel tank and just add the people it will perform very different to a boat that has an extra fuel tank, fishing/std equipment on it, an auxillary etc.

malvizzu · September 02, 2016, 16:57:56 CET

@Skip - the only things I have at the stern are the main engine, auxiliary and battery. Console is in centre with 45L tank beneath it. Another 22L tank is at the bow and other things such as 10L water, anchor, safety & emergency kit and small tool box are all in bow side compartments. When I have tackle bag, cooler and rods they are all placed up front.

lazyfisherman · September 03, 2016, 12:26:52 CET

I think that the propeller is unsuitable for your engine-boat combination since your etec should be doing between 5500 and 6000 rpm at WOT. Also keep in mind that your 'extra' 45 l fuel tank + auxiliary engine together weigh at least as much as an average person - so when you are fishing with your father you are effectively 3 people on board rather than two.

ciappinu · September 03, 2016, 13:42:09 CET

Malvizzu, my Seabrave equipped with a 50HP flies on plane in less than 5 seconds. The setup is very similar to yours, fuel tank in the middle, water in the front, battery at the back. Sometimes I put in a 2.2hp auxiliary at the back, it does affect lightly but not significant. I can also plane the boat with 2 persons at the back. As I said earlier, with 4 large persons and alot of luggage, the boat still goes on plane very easily.

I definitely suggest to reduce your prop pitch, 17 is too much. Try 15 or possibly 13. I also suggest adding hydrofoils, the difference is massive. Last and not least, my engine is propped up on the 3rd bolt, and I am also considering lifting it up completely to try. The eTec's prop is far behind your boat by at least 1 foot, so the anti-ventilation plate should be around 1 inch higher than the bottom of your boat.

malvizzu · September 03, 2016, 17:27:17 CET

Thanks guys for all the feedback. Will talk to Petecraft about it.

This morning I was at Stuart Marine in SPB and subject came on this with another guy. They too suggested reducing prop pitch. Lifting engine was another option but which might cause drag they said. My main concern is how to get props to try out.

malvizzu · September 11, 2016, 22:52:35 CET

Today I managed to take some readings as the sea was calm early in the morning. With 2 people on board I got this reading:

Plane: 7.5 sec
WOT: 5400
Speed: 27.8 knts

Today I also noticed a 15ft Buccaneer berthed near me with a 60HP. Prop size was 11 1/8 x 13. The owner, a good friend of mine, says his boat planes easily even with 4/5 people. Does it make sense?

ciappinu · September 12, 2016, 12:25:34 CET

You're not too bad malvizzu, but you can probably be better. See if you can borrow his prop.

Does the steering pull to the right when on plane?

The_Gaffer · September 12, 2016, 15:19:37 CET

Quote from: ciappinu on September 12, 2016, 12:25:34 CET
You're not too bad malvizzu, but you can probably be better. See if you can borrow his prop.

Does the steering pull to the right when on plane?

Ciappinu - my steering pulls to the right and also boat leans slightly to the right...is it because of the prop rotation?
I have a Petecraft 16ft powered by Yamaha F70. great speed to fuel burn ratio, only 12.7ltrs/hr @ 20knts. WOT speed is 28knts at 5800rpm, with 70ltrs fuel and 3 ppl on board.

skip · September 12, 2016, 15:56:09 CET

Torque steer from the rotation of the prop is quite normal. Ideally you want to set your anode fin that is below the anti-cavitation plate to negate that pull to the right and give you a neutral feel to the steering at cruise.

Leaning to the right you'll have to offset with the way you load the boat.

felic · September 12, 2016, 18:06:20 CET

Who sells Selva outboards now that Hi Tech marine are no longer in buisness?

malvizzu · September 13, 2016, 11:40:05 CET

Quote from: ciappinu on September 12, 2016, 12:25:34 CET
You're not too bad malvizzu, but you can probably be better. See if you can borrow his prop.

Does the steering pull to the right when on plane?

No it doesn't. When I first mounted the auxiliary the boat used to pull heavily to one side but than I adjusted the anode fin and it's now much better.

The_Gaffer · September 13, 2016, 13:01:28 CET

Quote from: skip on September 12, 2016, 15:56:09 CET
Torque steer from the rotation of the prop is quite normal. Ideally you want to set your anode fin that is below the anti-cavitation plate to negate that pull to the right and give you a neutral feel to the steering at cruise.

Leaning to the right you'll have to offset with the way you load the boat.

Excellent idea. The boat pulls to starboard, so I need to adjust the anode fin to steer slightly to port.