Cruisers Forum
 


Join CruisersForum Today

Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 04-09-2018, 09:37   #16
Registered User
 
Cadence's Avatar

Join Date: Dec 2008
Location: SC
Boat: None,build the one shown of glass, had many from 6' to 48'.
Posts: 8,733
Re: solutions for opening heavy teak butterfly hatches...

Quote:
Originally Posted by Rowglide View Post
I appreciate the simplicity of gas cylinders but they don't appeal to me aesthetically.
With a little ingenuity you could probably make them look nautical.
__________________

Cadence is offline   Reply With Quote
Old 04-09-2018, 09:43   #17
Registered User
 
S/V Alchemy's Avatar

Join Date: May 2008
Location: Toronto
Boat: Custom 41' Steel Pilothouse Cutter
Posts: 4,969
Re: solutions for opening heavy teak butterfly hatches...

Quote:
Originally Posted by Cadence View Post
Gas pistons similar to those used on auto (van) hatches would seem a rather simple solution.

That's exactly what I used on my 48" x 27" engine bay hatch. The engine was tarped to keep welding debris off it. The pistons work well:
__________________

__________________
Can't sleep? Read www.alchemy2009.blogspot.com for fast relief. Can't read? Avoid www.volumesofsalt.blogspot.com, because it's just personal reviews of sea books.
S/V Alchemy is offline   Reply With Quote
Old 04-09-2018, 09:43   #18
Moderator

Join Date: Jun 2015
Posts: 3,691
Re: solutions for opening heavy teak butterfly hatches...

This is the solution:

Quote: "We looked a boat a few years ago that used pistons to open the butterfly hatch, and had a sort of knotted pull string that could be used to set the opening height. We’re gonna try the same thing in the next week or two. "

It is important to use a mechanism that at no state of opening permits any part of it to protrude below the hatch coming/deckhead. Metal parts protruding below the deckhead can be deadly if you get thrown! The gas strut is a safe mechanism. By analogy to an electrical push switch, the hatch is "normally open", and at no state of opening does it stick down where it shouldn't. A lanyard is taken from the hatch frame via a turning sheave to a small horn cleat mounted within the coaming. This permits infinite adjustment within the strut's range, and prevents you being brained by the mechanism if you get thrown. Also extremely simple and maintenance free.


A winner all around :-)

TP
TrentePieds is offline   Reply With Quote
Old 04-09-2018, 10:13   #19
Registered User

Join Date: May 2017
Location: Maine USA
Boat: Gulfstar 41' ketch
Posts: 163
Re: solutions for opening heavy teak butterfly hatches...

It should be noted that some gas springs are available in 316 SS.
sailor_ed is offline   Reply With Quote
Old 04-09-2018, 11:08   #20
Registered User
 
Dougtiff's Avatar

Join Date: Jul 2015
Location: San Rafael, Ca.
Boat: Gaff rigged Ketch[Spray]37' on deck
Posts: 453
Re: solutions for opening heavy teak butterfly hatches...

Look at " Port townsend foundry", they have a selection of Skylite opening fittings, all Bronze, beautiful stuff.
Dougtiff is offline   Reply With Quote
Old 04-09-2018, 12:31   #21
Registered User

Join Date: Aug 2014
Location: Palm Beach Gardens, FL
Posts: 42
Re: solutions for opening heavy teak butterfly hatches...

Nice stuff Dougtiff! Good job!
Var Korall is offline   Reply With Quote
Old 04-09-2018, 13:49   #22
Registered User
 
thruska's Avatar

Join Date: Jan 2014
Location: cruising / rv
Boat: 1969 Columbia28, 1984/2016 Horstman TriStar36
Posts: 655
Images: 10
Re: solutions for opening heavy teak butterfly hatches...

Quote:
Originally Posted by Rowglide View Post
I appreciate the simplicity of gas cylinders but they don't appeal to me aesthetically.
Sometimes you need to let function trump asthetics... no ?
Antigue them spray with rustoleum hammered look paint copper or bronze.
__________________
There ya go, and when ya got there, there ya are !
thruska is offline   Reply With Quote
Old 04-09-2018, 17:11   #23
Registered User
 
redhead's Avatar

Join Date: Mar 2011
Location: PNW 48.59'45N 122.45'50W
Boat: Ian Ross design ketch 63'
Posts: 1,225
Images: 9
Re: solutions for opening heavy teak butterfly hatches...

Quote:
Originally Posted by Dougtiff View Post
Look at " Port townsend foundry", they have a selection of Skylite opening fittings, all Bronze, beautiful stuff.
When we stopped by to see what they had last year, they took us on a tour of the foundry, answered all our questions and generally made us feel as though our business would be a pleasure.

Their work is impeccable, done in the traditional ways, and they are delightful people. So glad you brought them up!
__________________
It's what you learn after you know it all that counts...
redhead is offline   Reply With Quote
Old 05-09-2018, 05:23   #24
Registered User
 
Rowglide's Avatar

Join Date: Jan 2017
Location: Kingston, Ontario
Boat: Hans Christian 43
Posts: 310
Re: solutions for opening heavy teak butterfly hatches...

That Port Townsend hardware is amazing!!!
Unfortunately I cannot bankroll hardware quite that nice. Besides, I'd really have to up my varnishing skills too!!!
Rowglide is offline   Reply With Quote
Old 05-09-2018, 08:20   #25
Registered User
 
bailsout's Avatar

Join Date: May 2013
Location: Morro Bay, CA
Boat: Herreshoff 28 modified ketch- wood
Posts: 268
Re: solutions for opening heavy teak butterfly hatches...

I donít think you can beat the notched teak pieces for simplicity or aesthetics. I will experiment with it on my forehatch.... very Herreshoff solution and very apropos for my Herreshoff.
Another possibility are folding springs but allows only for full open or full closed and if there are two for each door might require too many hands.
bailsout is offline   Reply With Quote
Old 05-12-2018, 18:10   #26
Registered User
 
Rowglide's Avatar

Join Date: Jan 2017
Location: Kingston, Ontario
Boat: Hans Christian 43
Posts: 310
Re: solutions for opening heavy teak butterfly hatches...

A solution (I hope)
I picked up these "conservatory window cranks" or screwjacks in the UK.

50.00GBP!!! for the pair. (about $65.00 US)

They are double screwed so the total lift is about 12" and there is a quick relaes pin at the top to allow easy disconnection for opening further.
They are chrome plated brass, not bronze but for that price. also available in polished brass and "antique brass" finishes.
They were also available with permanently mounted crank handles but they stick down into my headspace. I'll shape up a nice crank for them out of aluminum or stainless rod (whichever I find lying around first).
Attached Thumbnails
Click image for larger version

Name:	IMG_1963.JPG
Views:	44
Size:	123.4 KB
ID:	181750   Click image for larger version

Name:	IMG_1964.JPG
Views:	45
Size:	82.3 KB
ID:	181751  

Rowglide is offline   Reply With Quote
Old 05-12-2018, 20:32   #27
Registered User

Join Date: May 2015
Posts: 79
Re: solutions for opening heavy teak butterfly hatches...

I build a lot of products for customers using gas struts they do have their place and can work well for holding open aswell as closed but a marine environment is not a great place for them

The screw opener is what I was going to suggest and is a fairly simple thing to make for a competant metalworker.
If you need more opening room than that offers a scissor opening mechanism may be a better choice

Use ACME thread profile and brass or bronze for one half and s/s for the other to avoid galling
__________________

stainless guy is offline   Reply With Quote
Reply

Tags
hatch, teak

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale: Opening Hatches hikersailor General Classifieds (no boats) 0 17-10-2017 05:25
How heavy is too heavy? Arrandir Anchoring & Mooring 45 09-03-2017 04:35
Clear deck inside opening hatches pdenton Deck hardware: Rigging, Sails & Hoisting 6 31-07-2016 17:06
Butterfly Hatches - Do Yours Leak? redhead Construction, Maintenance & Refit 0 15-05-2016 12:49
Hatches opening on cat tolly Multihull Sailboats 12 08-04-2012 14:16

Advertise Here


All times are GMT -7. The time now is 15:57.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.