Cavitating???

[JoshOnt]

Hello, so I have a 14ft boat with a 50 HP mercury on it. It seems to run fine with two people but on the rare time it will plane out it starts to cavitate. I am hoping to check tomorrow for a spun hub but if it is not, anyone have an idea what might be going on?

 

[coolbri70]

Re: Cavitating???

not properly trimmed? motor mounted too high? hook in the hull?

 

[foodfisher]

Re: Cavitating???

Search cavitating vs ventilating.

 

[JoshOnt]

Re: Cavitating???

Trim is down all the way and it still happens. Also will search that up and see what I can find.

 

[foodfisher]

Re: Cavitating???

Trim all the way down on an engine mounted too high won't fix it.

 

[coolbri70]

Re: Cavitating???

Search cavitating vs ventilating.

assumed he was talking about ventilation as he wants to check for a spun hub do you have have cavitation burns on your prop?

 

[foodfisher]

Re: Cavitating???

Your assumption is better than mine. Cudos.

 

[JoshOnt]

Re: Cavitating???

The edge of my prop is worn to the metal and is damaged. The black paint has "bubbles" in it. That is the best way to describe it. I am not very good with props as you can tell.

 

[coolbri70]

Re: Cavitating???

The edge of my prop is worn to the metal and is damaged. The black paint has "bubbles" in it. That is the best way to describe it. I am not very good with props as you can tell.

maybe venting and cavitating?

 

[JoshOnt]

Re: Cavitating???

Both??

 

[coolbri70]

Re: Cavitating???

are you losing thrust completely? coming off plane?

 

[JoshOnt]

Re: Cavitating???

I am coming off plane and only going slowly, but I am having a hard time getting on a good plane. Will get 3/4 way there and stay there.

 

[foodfisher]

Re: Cavitating???

Can't swallow a 50 cavitating anything without blowing itself up. Has to be ventilation sucking air from somewhere.

 

[JoshOnt]

Re: Cavitating???

Where would it be getting air from? I had a fin put on to push water down and keep air out

 

[Howard Sterndrive]

Re: Cavitating???

is this boat new to you? Have you had it working right before?

short shaft motor on 20" transom?

 

[JoshOnt]

Re: Cavitating???

Boat is new to me, and I am not sure the transforms height.

 

[foodfisher]

Re: Cavitating???

Drop down to next lowest hole on the transom bracket.

 

[JoshOnt]

Re: Cavitating???

I have looked and I don't think I am able to move then engine down on the transom.

 

[foodfisher]

Re: Cavitating???

If you can get up on plane, I don't think it's a spun prop. After getting on plane you try to accelerate and the prop busts loose, the prop is too high in the water and sucking air/ventilating. The only solution is lower the prop or get your fat buddies to sit in the aft portion of the boat.

 

[JoshOnt]

Re: Cavitating???

Okay well I had me 115 pounds, father 140 pounds and a friend who was 220 all in the boat and we will went slow. I would not pick up any speed. Also I have got the boat to plane ONCE! This was with just me and my father, it lasted for about 15 second till I gave it more gas and tried to go a bit faster.