Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 05-06-2013, 20:08   #1
Registered User
 
Krogensailor's Avatar

Join Date: May 2013
Location: Naples Fl
Boat: Kadey Krogen 38 cutter
Posts: 355
Images: 13
Building a mast step

I have a Krogen 38. It has a very hefty mast step that unfortunately is half corroded away. I'm thinking of making a copy out of glass and epoxy. As I said its a solid 1 1/4" thick aluminum piece. What about just layering layer after layer of glass to the appropriate thickness. I'm pretty sure it would take the compression, and it would be the end of corrosion. Might be some grounding issues. Any input would be appreciated. Thanks
__________________

__________________
Krogensailor is offline   Reply With Quote
Old 05-06-2013, 20:28   #2
Registered User

Join Date: May 2008
Location: daytona beach florida
Boat: csy 37
Posts: 2,844
Images: 1
Re: Building a mast step

i don't think that any amount of glass could take the compression AND the mast working on it. i'll bet you could go to any good metal shop and get them to make up a new mast step to your specs.

or you might build your own out of five 1/4" aluminum plate.
__________________

__________________
onestepcsy37 is offline   Reply With Quote
Old 05-06-2013, 20:38   #3
Senior Cruiser
 
skipmac's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Location: 29 49.16 N 82 25.82 W
Boat: Pearson 422
Posts: 12,379
Re: Building a mast step

I had to replace my mast step plus raise it 3" due to the corroded end of the mast itself I had to remove. Used 3" thick block of UHMWPE for the base and an 1 1/2" piece to make the socket for the mast to sit in. I did put a 1/4" sheet of 6061 Al under the mast to take the abrasion as I wasn't sure the plastic would take that well.

Haven't stepped the mast yet so ask me in a couple of years how it worked.
__________________
The water is always bluer on the other side of the ocean.
skipmac is offline   Reply With Quote
Old 05-06-2013, 20:40   #4
Head in a locker
 
Cavalier's Avatar

Cruisers Forum Supporter

Join Date: Dec 2010
Location: Houston, TX
Boat: Beneteau 461 47'
Posts: 879
Images: 1
A typical (well laid up) FG with resin will have a compressive strength approaching 20000psi. A good grade Aluminum, however, will be closer to 45000psi.

The aluminum will exhibit a much greater isotropy than you'll manage with a FG fabrication - so i'd personally go for 3.5x to 4x the cross sectional area of the existing aluminum step if I was to build one out of GF.

As previously mentioned, it may actually be more cost effective to replace the existing step section with good aluminum based on the same design.. 6061 T6 would work fine.
__________________
"By day the hot sun fermented us; and we were dizzied by the beating wind. At night we were stained by dew, and shamed into pettiness by the innumerable silences of stars."
Cavalier is online now   Reply With Quote
Old 05-06-2013, 21:34   #5
Registered User

Join Date: Nov 2011
Location: Montegut LA.
Boat: Now we need to get her to Louisiana !! she's ours
Posts: 3,421
Re: Building a mast step

Stainless maybe ??? I would at least think about it!
__________________
Bob and Connie
bobconnie is offline   Reply With Quote
Old 05-06-2013, 22:02   #6
Registered User
 
Delfin's Avatar

Join Date: Aug 2010
Location: Anacortes, WA
Boat: 55' Romsdal
Posts: 1,390
Re: Building a mast step

Quote:
Originally Posted by bobconnie View Post
Stainless maybe ??? I would at least think about it!
That is what I built mine out of. Here is the drawing I provided the fabricator. We polished it to 3000 grit, so its purty as well. I can post a picture if it would be helpful.
Attached Thumbnails
Click image for larger version

Name:	Mast step.jpg
Views:	293
Size:	137.1 KB
ID:	61961  
__________________
http://delfin.talkspot.com
When stupidity is a sufficient explanation, there is no need to appeal to another cause.
- Ulmann's Razor
Delfin is offline   Reply With Quote
Old 05-06-2013, 23:55   #7
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
Re: Building a mast step

Why not just buy a new one from the manufacturer?
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!

Unprepared boaters, end up as floatsum!.......
delmarrey is offline   Reply With Quote
Old 06-06-2013, 12:22   #8
Registered User
 
Krogensailor's Avatar

Join Date: May 2013
Location: Naples Fl
Boat: Kadey Krogen 38 cutter
Posts: 355
Images: 13
Re: Building a mast step

Thanks for the response's. The numbers don't look to good, 20000 vs 45000. I have 10 roll's of glass here and I barrel of west system. So trying to use whats on hand. But I think it doe's make sense to fab one out of good alum. Question on that, this thing has the base and then a tenon, socket, chunk, that goes into the mast base. Do you guys think it could be attached with a couple 1" dowels? As to getting one from the manufacture, they haven't built the boat since 1990. It's the only sail boat Kadey Krogen made. They did a good job. This thing is bullet proof, but the gods do have their way with taking things back, corrosion,rot,disintegration, Give's us thing's to do
__________________
Krogensailor is offline   Reply With Quote
Old 06-06-2013, 12:35   #9
Senior Cruiser

Cruisers Forum Supporter

Join Date: Jul 2005
Boat: Outbound 44
Posts: 4,583
Re: Building a mast step

You purchase G-10 frp sheets in many thicknesses.
__________________
Paul L
http://svjeorgia.blogspot.com
Paul L is offline   Reply With Quote
Old 06-06-2013, 12:59   #10
Registered User
 
salticrak's Avatar

Join Date: Jul 2011
Location: palmwoods qld australia
Boat: wharram tiki 26
Posts: 739
Re: Building a mast step

Check out the wharram catamaran sites, all the mast steps, tabernacles are ply/FG on the bigger cats. I would go with aluminum in your case though.
__________________
salticrak is offline   Reply With Quote
Old 06-06-2013, 13:09   #11
Registered User
 
Cotemar's Avatar

Join Date: Dec 2007
Boat: FP, Helia 44 Evo
Posts: 5,717
Re: Building a mast step

SS base plate to replace the corroded aluminum one is the way to go.
The new SS base plate will last the life of the boat.

My dock buddy just did his last year on a Tartan 46 sailboat.
Polished SS Looks better than aluminum also.
__________________
Cotemar is offline   Reply With Quote
Old 06-06-2013, 14:50   #12
Registered User
 
Krogensailor's Avatar

Join Date: May 2013
Location: Naples Fl
Boat: Kadey Krogen 38 cutter
Posts: 355
Images: 13
Re: Building a mast step

Gonna go with aluminum plate . The step is not visible from the cabin.
__________________
Krogensailor is offline   Reply With Quote
Old 06-06-2013, 15:04   #13
Senior Cruiser

Cruisers Forum Supporter

Join Date: Jul 2005
Boat: Outbound 44
Posts: 4,583
Re: Building a mast step

FYI, here's mast step built of using G10 on a 44 footer
__________________
Paul L
http://svjeorgia.blogspot.com
Paul L is offline   Reply With Quote
Old 06-06-2013, 22:40   #14
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
Re: Building a mast step

Not sure if the OP is talking about a keel stepped or deck stepped, but here's what happens to alum. on a keel stepped SS plate.

And the last picture is what it should look like, like Paul L's.


.
Attached Thumbnails
Click image for larger version

Name:	DSCN0992.jpg
Views:	149
Size:	420.1 KB
ID:	62029   Click image for larger version

Name:	DSCN0993.jpg
Views:	147
Size:	429.0 KB
ID:	62030  

Click image for larger version

Name:	DSCN0999.jpg
Views:	218
Size:	413.2 KB
ID:	62031  
__________________

__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!

Unprepared boaters, end up as floatsum!.......
delmarrey is offline   Reply With Quote
Reply

Tags
mast

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:18.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.