Forums > Sailing General

opinions please mast compression

Reply
Created by HG02 > 9 months ago, 19 Jul 2014
HG02
VIC, 5814 posts
19 Jul 2014 8:22PM
Thumbs Up




This makes me want to pull the bulk head covers off both sides see what under there.





Top cover trims I mean the ones above the clock and barometer

DAMA
QLD, 239 posts
19 Jul 2014 8:32PM
Thumbs Up

Is that just an epoxy pad on foam sandwich deck?

HG02
VIC, 5814 posts
19 Jul 2014 8:50PM
Thumbs Up

Select to expand quote
DAMA said..
Is that just an epoxy pad on foam sandwich deck?



solid fiberglass deck and hull walker H28

When the mast were pull on the mizzen there is a dent above the spreaders . I inquired about what happen about 20 years ago a boat lost it mooring and took out the mizzen on the boat on the way pasted perhaps this compression on the main mast bulk head may have been a result of this too.
I'm happy enough to fit a mast compression post and move the forward cabin entry to stard board similar to this walker




DAMA
QLD, 239 posts
19 Jul 2014 11:05PM
Thumbs Up

Or you could do a couple of nice custom stainless upside down "L" brackets bolted through the bulkhead. Just a thought.

HG02
VIC, 5814 posts
19 Jul 2014 11:13PM
Thumbs Up

Select to expand quote
DAMA said..
Or you could do a couple of nice custom stainless upside down "L" brackets bolted through the bulkhead. Just a thought.


Think Ill remove the cover on the forward cabin and have a look at the top of bulk head make sure theres no rot and in good condition if its OK Ill make some S/S brackets "L" brackets like you said Dama

Donk107
TAS, 2446 posts
19 Jul 2014 11:46PM
Thumbs Up

Hi HG

I have looked at your photo's but I don't really understand what your concern is

I can see where the mast mounts above the bulkhead there is a slight depression in the deck

Is this what you are concerned about

When you talk about fitting stainless L brackets what would the purpose of them be

In the original brochure you sent me a while ago there is no compression post shown

Regards Don

HG02
VIC, 5814 posts
20 Jul 2014 12:13AM
Thumbs Up

Select to expand quote
Donk107 said..
Hi HG

I have looked at your photo's but I don't really understand what your concern is

I can see where the mast mounts above the bulkhead there is a slight depression in the deck

Is this what you are concerned about

When you talk about fitting stainless L brackets what would the purpose of them be

In the original brochure you sent me a while ago there is no compression post shown

Regards Don



The bulkhead was designed to be compression post . The mast has pushed down on the bulkhead and there is damage there of some sorts
On deck where the mast step was the forward two mounting holes are cracked and there been bogged up .
Below deck the fiberglass is depressed just in front of the bulk head
After removing both masts I found a dent above the spreader on the Mizzen I inquired how it might have happened was told a near by boat broke its swing mooring and as it went past it took off the mizzen as theres a stay from the main mast to the mizzen( this holds up the mizzen) it may have done some damage back then.

brizzydave
406 posts
20 Jul 2014 11:19PM
Thumbs Up

Grind n clean up mast foot pad. Mark n tape out area bigger than original pad. Use epoxy or poly or ply encased with poly/epoxy with whatever woven/biaxial etc stuff you prefer. Make yourself a strong new heavier pad that sits in/above the cabin top. Don't forget to fillet corners with bog if using a square shaped ply board. Mine sits about 30 above but is 60 mm thick ply in polyester as my hulk has a 30mm plus cored deck aswell. This will lengthen your shrouds n stays. I added long shackles at shroud turnbuckles as my boat is a dinghy compared to most on here. Hit the polyester and beef that bi#tch up!!! Ps. Don't get caught up in the whole polyester epoxy bull****. Pps the weight moment vertically down at base of mast isn't as crazy as you think. Ppps ....the bulkhead assembly can be thought of as pulling in as well as pushing your mast outwards. On my hulk I really can't see how the mast weight transfers to the keel because it sorta doesnt. The whole main bulkhead moves as one. There is no "squashing" moment of the main bulkhead only localized squashing as the plastic sinks a bit at the mast foot. If that makes sense. Probably not. Maybe beef up your backing plate(s) if required too? And pot your holes with epoxy if required.

TKNick
NSW, 123 posts
22 Jul 2014 7:49PM
Thumbs Up

Just a thought! Your rigging may have been over tight. Read recently an article on rig tension that said you can force your mast down placing undue tension on your deck and bulkhead if rigging screws over adjusted. Plenty of info on the web about correct rig tension and how to measure and adjust.
I would go the added compression post option with a new plywood oversized pad up on deck. If you don't have the adjustment in the turnbuckle to allow for the increased shroud and stay length you can get shroud/stay lengthening plates from Westmarine or just add longer shackles as previously mentioned.

Donk107
TAS, 2446 posts
22 Jul 2014 8:01PM
Thumbs Up

Hi HG

I was under the impression you had this problem sorted with this pic of you new compression post's

Regards Don



HG02
VIC, 5814 posts
22 Jul 2014 8:43PM
Thumbs Up

I figured if I used four Bunnings pickets as a compression post should be all good

Donk107
TAS, 2446 posts
22 Jul 2014 8:47PM
Thumbs Up

And you have lots to hold on toif conditions get rough

Select to expand quote
HG02 said..
I figured if I used four Bunnings pickets as a compression post should be all good


and you will never be short of a hand hold if conditions get rough

Regards Don

HG02
VIC, 5814 posts
22 Jul 2014 9:03PM
Thumbs Up

Do you like my pendulum speaker brackets Donk ? You just wish you had a set of those bad boys

Donk107
TAS, 2446 posts
22 Jul 2014 9:28PM
Thumbs Up

Ve

Select to expand quote
HG02 said..
Do you like my pendulum speaker brackets Donk ? You just wish you had a set of those bad boys


Very impressive HG

I think that gimballed speakers are essential on a modern yacht but unfortunately mine missed out but at least with the zip clip mountings you will not have any corrosion issues

Are you intending to close in the section above the seat backs

Regards Don





HG02
VIC, 5814 posts
22 Jul 2014 10:35PM
Thumbs Up

yes Donk I have a few teak shutters that I will cut down to make double doors and hopefully remove the gimbaled speaker mounts . I am trying to make lamb out of Mutton here . The other day in the I.T.Bin at work I scored a video projector unfortunately its 240 volt but it work well. some where around here in one of my computer draws I have a 12 volt LED projector went looking for it for the boat thought of just adding a TV card and utilize a computer to watch TV and movies and plug it into a projector and just pull a screen down to watch T.V would save having a TV on board . Just fit a pull down screen on the opposite side of one of settee's and fit the projector behind the shutter doors behind me when I watching . Its only a figment of my imagination as yet but Ill experiment with it
http://www.ebay.com.au/itm/Blue-1080P-HD-Multimedia-LED-Projector-Home-Cinema-Video-AV-TV-VGA-HDMI-/221477072550?pt=LH_DefaultDomain_15&hash=item33910feea6
This one is 12 volt uses 16 watt Ive a old one hanging around here that Ill play with and if it works out ill search around



Subscribe
Reply

Forums > Sailing General


"opinions please mast compression" started by HG02