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QLite

Member Since 17 Feb 2004
Offline Last Active Sep 15 2016 03:48 PM
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Posts I've Made

In Topic: Chicago Area III

07 January 2015 - 11:22 PM

I just got off the phone with the Bayview Mac Chair and he stated that if we wanted a Super Mac finish he would assist us in any way that he could!

 

We got into some of the logistical details and everything seemed workable.  I'm going to do what I can to make this a reality for 2015!

 

Who's interested?


In Topic: Bayview Mac 2015 NOR

07 January 2015 - 11:18 PM

I just got off the phone with the Bayview Mac Chair and he stated that if we wanted a Super Mac finish he would assist us in any way that he could!

 

We got into some of the logistical details and everything seemed workable.  I'm going to do what I can to make this a reality for 2015!

 

Who's interested?


In Topic: Bulkhead repair

02 December 2014 - 05:24 PM

Cheetah, pretty much all rotten areas have been removed.  Oh, and the boat is on the hard, on her cradle for the cold Chicago winter....


In Topic: Bulkhead repair

02 December 2014 - 03:27 AM

Do you know that for a fact?
Most bulkhead are there for crash and compression loads not tention loads like the keel would apply.
Most of the stress from the key should be held my the stringers in the boat and the stricter of the haul with the load being spread threw the haul not the bulk head. That's not saying when the boat is loaded up that the bulkhead dose not help.

 

Well there's a keel right under the area in question in the plans in first post. No idea how many frames there are in the area supporting the keel but suspect that this one will take some of the keel load.

 

There's a bending moment applied to that area when the boat heels.

 

But hey, what do I know...

 

Well, I guess my question #1 has been answered.  BTW, this bulkhead was glassed to a substantial 'frame'.  This frame is about 2' aft of the mast step. There are these large frames about every 2'.  The forward most keel bolt of the fin keel is aft of this bulkhead frame by about 10". So yes, the leading edge of the keel is below this frame.  

 

Attached is another pic looking aft towards main bulkhead.Attached File  Forward Bulkhead.jpg   131.44KB   41 downloads


In Topic: Bulkhead repair

02 December 2014 - 12:01 AM

Great input from everyone THANK YOU.....
So, after comparing densities of marine ply w/FRP I'm greatly leaning towards the much more expensive and heavier G10/FR4 that McMaster sells.  I calculate that the Alum plate that I drew made of 6061 Alum 3/16" would weigh ± 2.2 pounds.  The (2) 3/16" G10 doubled up would weigh about 3.2 pounds.  The marine ply at 1/2" would be about 1/2 pound.  I guess it's a good thing the weight change is minimal however I do race this boat.

 

As my original ply was likely 1/2" or maybe 5/8" thick, I'm considering using two thinner sheets of the FRP, 3/16" and applying one in place, and immediately inserting the second layer of 3/16"  In this manner, I'm hoping that I'd be able to maneuver the thinner sheets down into the 2 1/2" to 3" cavity left from where the original wood went right down to the hull.  And of course the second sheet would be well slathered in thickened epoxy to help fill any voids left.

By laminating this repair up I figure that I can not only get the material built up in these difficult locations, but that the end product would be even stronger.  This build up method would also make it easier to scarf the joint into the vertical sections of the good existing bulkhead on either side of the passage door (only about 2" in width.  Essentially replacing on my drawing the aluminum plate with the 2 laminated up to 1/2", (2) 3/16" FRP panels.