Jacking Up the Aft End By The Skeg??

[Paul Lefebvre]

My boat is on a boat cradle. The whole keel is sitting flat on a support
piece. I want to remove the support from under the aft end (whole hollow
section ) of the keel. I have support pads under the bulkhead between the
galley and aft cabin and under the bulkhead just aft of the engine.

In order to relieve some of the weight on the aft section, I was thinking of
using a 20 ton bottle jack under the skeg. This appears to be the strongest
area back there, but I would like to know what others think and has anyone
jacked up the boat at all back there. As I take some of the weight on the
skeg, I will be raising the 4 aft support pads to also take some of the
weight. Is here a concern with damaging the rudder post while attempting
this or is this skeg strong enough??

Plan B is to hire a 35 ton crane to raise the boat an inch and one half.
This will cost $630 due to the 4 hour minimum.

Thanks,

Paul
Boundless #28

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[madsailor]

Hi Paul,

I've never done this with a 424, but I've added several more poppets on each side and then walked around the boat turning each 1/2 turn until it's as high as I want (or a little more) and then blocking the keel, and lowering to final height the same way.

It takes a long time but it's good exercise.

That said, I'd expect the skeg to be more than strong enough to raise the aft end. You'll certainly know almost immediately…

Bob

On Mon, Jun 9, 2008 at 6:18 PM, Paul Lefebvre < ([email][/email])> wrote:

My boat is on a boat cradle. The whole keel is sitting flat on a support piece. I want to remove the support from under the aft end (whole hollow section ) of the keel. I have support pads under the bulkhead between the galley and aft cabin and under the bulkhead just aft of the engine.

In order to relieve some of the weight on the aft section, I was thinking of using a 20 ton bottle jack under the skeg. This appears to be the strongest area back there, but I would like to know what others think and has anyone jacked up the boat at all back there. As I take some of the weight on the skeg, I will be raising the 4 aft support pads to also take some of the weight. Is here a concern with damaging the rudder post while attempting this or is this skeg strong enough??

Plan B is to hire a 35 ton crane to raise the boat an inch and one half. This will cost $630 due to the 4 hour minimum.

Thanks,

Paul
Boundless #28

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[Paul Lefebvre]

Chuck:

My boat was sitting with weight all along the bottom of the keel. However,
I had too much weight on the aft end, as it had indented the wood 1/2″
where it was sitting. I am re-doing a repair that was done 15 years ago that
wasn’t up to my standards. After cutting out some of the old repair area,
the hull was distorting a bit, making it difficult to line up new material.
So I wanted to get the aft end of the keel up in the air, off the support
base, by rolling the weight forward more on to the lead portion of the keel.

I wasn’t able to jack up the rear support pads any more, with the weight on
them. In order to relieve the weight a bit, I wanted to take up some of the
weight on the rudder skeg (not the cutlass bearing skeg under the engine). I
took Bob’s word that it would be okay, assuming of course he would give me
his boat if I broke mine. I took just enough weight on the bottle jack to
allow me to get a turn on each of the support pads. After about an hour, I
got the aft end of the keel clear of the support wood, so I should be able
to remove it and finish my repair.

Thanks,
Paul

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