On the rocks

[H20Rat]

**deleted**

 

[kenmyfam]

Re: On the rocks

Let's hope he learns from the experience before he kills or injures someone.

 

[kyle f]

Re: On the rocks

Sorry to say, but no matter what he said... he didn't run that aground while under power.

There is no lower unit damage, props are ok, and both lower units are up in trailering position.

To me, it looks like he beached it and the water levels went down.

 

[ShaneCarroll]

Re: On the rocks

If he didn't run that aground under power, what happened to the windshield? There is broken glass all over the bow. Well, whether he was under power or not, that sucks. People need to limit themselves of drinking while on boats. I mean, a couple drinks is not that bad, just be responsible. This guy obviously had way too many. Then again, in the dark a completely sober person not familiar with those waters could have done the same thing.

 

[Aviator5]

Re: On the rocks

How come his outdrives are up?

 

[TBarCYa]

Re: On the rocks

There's a valve in the hydraulics that allow the drives to push up if they strike something to prevent damage to the drives.

 

[Aviator5]

Re: On the rocks

It is technically impossible to transfer hydraulic fluid that fast to allow drives to come up at that speed.

 

[45Auto]

Re: On the rocks

You don't think someone could have raised the drives AFTER it had been run aground?? Looks like a pretty soft sandbar (no rocks), doubt if it would have damaged the hydraulics any.

 

[GrindKore]

Re: On the rocks

If you look closer, the skegs appear to be bent. So yes, I think the boat was under power and out-drives were raised after the fact.

 

[TBarCYa]

Re: On the rocks

It is technically impossible to transfer hydraulic fluid that fast to allow drives to come up at that speed.

Tell that to my alpha1. I've bumped my share of logs while on plane and the drive moves.

 

[204 Escape]

Re: On the rocks

Nice boat operated by an idiot.

 

[Aviator5]

Re: On the rocks

Tell that to my alpha1. I've bumped my share of logs while on plane and the drive moves.

If that so, they would move when you put it in reverce.

 

[rusirius]

Re: On the rocks

If that so, they would move when you put it in reverce.

Unless the designer / manufacturer was smart enough to think about this before making the boat and decided to disable it with reverse...

Nah... Probably not...

 

[Aviator5]

Re: On the rocks

Desighner disabled it electrically, so you can't trim the drive while in reverse, but hydraulic circuit remains the same.

 

[Pascal]

Re: On the rocks

all it takes is a relief valve in the piston to let oil from the rod side back to the piston end of the cylinder. External force on the LU to raise it (like when hitting a log or sand bar) would increase the PSI in the rod side cavity and open the relief valve to let the LU move. It is designed to work that way and work only in one direction.

from the size of the cylinders it looks like it would take less about a pint of oil leaving the rod side to let the LU up all the way and from the looks of the leverage and piston area on the rod side, the instant psi could easy go to over 5000 psi when the leg takes a hit. it needs a path for the oil to go to limit the pressure and keep from breaking and bending things. It wouldn't be supported by oil after the impact and would need a shot of oil to hold it down again.

This exploded view of an alpha one trim cylinder shows what I'm talking about.....

http://www.sterndrive.info/alpha-one/trim_cylinder_layout.html

 

[H20Rat]

Re: On the rocks

**deleted**

 

[Pascal]

Re: On the rocks

It is technically impossible to transfer hydraulic fluid that fast to allow drives to come up at that speed.

I guess you have never seen what happens when a hydraulic hose bursts on a raised but mechanically unsupported front end loader........

The oil quantities and the passage sizes are proportional between the two situations. A cup of oil transferred within each cylinder on the boat is enough to allow the out drive's to raise all the way.

 

[Aviator5]

Re: On the rocks

Than if you go from full forward to full reverse the drive should rise?

 

[Pascal]

Re: On the rocks

Than if you go from full forward to full reverse the drive should rise?

Forces acting in the assembly will dissipate through the path of least resistance. It takes less force to move the boat backwards and/or the force of the prop thrust pulling on the out drive in reverse is limited by the slip in the water so the PSi on the rod side of the cylinder will be less than the designed pressure setting of the shock/relief valve in the cylinder (edit) unless it has an outside mechanical force act on it like the sand bar or it strikes a submerged object while the boat is in motion.

 

[Aviator5]

Re: On the rocks

Even if the rod side of cylinder was fully open, so the drive can swing back freely, I don't think it will save it from the impact, cosidering the mass and, therefore, inertia of the drive and speed of the boat.
It is a different story if the line bursts, from the normal operation when the fluid goes thru valves.