Please and thankyou dipping port side @ speed

[dirtbikejockey]

Hey all, Australia here!!!!! I have just finished restoring my 17ft monark windsor 135 hp v6 mercury outboard with hydraulic steering running on a jacking plate which has taken me about 12 mths to complete its also had a new marine ply transom 40mm thick and new tassie oak stringers and floor has been replaced it sits really well in the h2o . I took her out for its first test and everything was going fine as i picked up lots of speed, the boat suddenly grabbed on the port side and almost rolled and flipped it over, lucky for me i could see it coming as the bow dipped port side so backed off straight away!!!! anyone got any ideas what this could be? please and thankyou

 

[ozenine]

Re: Please and thankyou dipping port side @ speed

Hey all, Australia here!!!!! I have just finished restoring my 17ft monark windsor 135 hp v6 mercury outboard with hydraulic steering running on a jacking plate which has taken me about 12 mths to complete its also had a new marine ply transom 40mm thick and new tassie oak stringers and floor has been replaced it sits really well in the h2o . I took her out for its first test and everything was going fine as i picked up lots of speed, the boat suddenly grabbed on the port side and almost rolled and flipped it over, lucky for me i could see it coming as the bow dipped port side so backed off straight away!!!! anyone got any ideas what this could be? please and thankyou View attachment 142749View attachment 142750View attachment 142754View attachment 142755View attachment 142756

I was going to say trim tabs, but I do not think you have them. Another possibility is problem with steering. Do you have any slack in your steering? I am not sure if it can be overpowered, so the hull gets completely out of the water and then falls on the heavy (port) side?

 

[dirtbikejockey]

Re: Please and thankyou dipping port side @ speed

I was going to say trim tabs, but I do not think you have them. Another possibility is problem with steering. Do you have any slack in your steering? I am not sure if it can be overpowered, so the hull gets completely out of the water and then falls on the heavy (port) side?

Thanx for reply!!!! It has brand new teleflex hydraulic steering on board, i was thinking trim tabs, Its rated to carry 6 peoples and carry a 150hp on the back... really strange for it to happen freaked me out abit bruz.....

 

[ozenine]

Re: Please and thankyou dipping port side @ speed

Are those hydrolic trim tabs? Sorry, i think i missed them on your pictures. How fast were you going when that happened?

 

[dirtbikejockey]

Re: Please and thankyou dipping port side @ speed

Nah bud i havent got em yet, everything on the boat is new!!! just not sure why its doing it. I was doing maybe 60kms an hour @ half throttle the h2o was below 0.5 really flat like glass i was looking for more speed and then bammmmmmm...

 

[Philster]

Re: Please and thankyou dipping port side @ speed

Check the steering set up. I think you are losing control of the engine suddenly for a run like that to wind up as a sharp turn, which would result in 'grabbing' on the port side.

Get the steering squared away. You're losing control of your engine.

 

[dirtbikejockey]

Re: Please and thankyou dipping port side @ speed

hmmmmmmmmmmm, i dont think that the problem is with the steering has been bleed properly and there is no airbubbles in the oil at all. if you go to the engine and try and turn it by hand there is no way you can move it , even if you are at the steering wheel and someone holds the motor you cant stop it from turning. I was thinking maybe its the zinc tab? they say put them straight if its hydraulic steering so i will move it to the right some more, i will try it in reverse on the weekend and see if it goes port or starboard slowly while the motor is straight, when it happend it felt like it was in slow motion and started to lean slowly to the port side but as i was going hard it seemed like it was happerning so fast that i was going to flip it. "its hard to explain on here, im thinking i might set up my helmet cam at the back of the boat and see if i can see the problem".....

 

[Bondo]

Re: Please and thankyou dipping port side @ speed

I took her out for its first test and everything was going fine as i picked up lots of speed, the boat suddenly grabbed on the port side and almost rolled and flipped it over, lucky for me i could see it coming as the bow dipped port side so backed off straight away!!!! anyone got any ideas what this could be?

Ayuh,.... How straight, 'n true is the aft 6' of the hull,..??

 

[dirtbikejockey]

Re: Please and thankyou dipping port side @ speed

it seems ok i have even ran a string line under the hull to follow the contours of the hull from the keel to the chine i cant find any dips or hollows or bumps...............

 

[dirtbikejockey]

Re: Please and thankyou dipping port side @ speed

hey all, i have fixed the problem. it was the zinc trim tab on the cavitation plate it had been set to the middle!!! so i turned it right and now the boat is flying in a dead streight line. I have also moved the motor up 1 more inch and now she is using alot less petrol.... thankyou for your help!!!!! her top speed is?... 95.6 kms an hour im very happy with my end result.....