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#272751 - 05/24/14 10:03 PM beams  
Joined: Apr 2012
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mousetrap Offline
stranger
mousetrap  Offline
stranger

Joined: Apr 2012
Posts: 11
Warners bay , nsw , Australia
Is there a specific grade of aluminium for the beams?


Cheers,Dave.
CHA-CHING 922
BITE ME 1749
-- Have You Seen This? --
#272757 - 05/25/14 03:19 AM Re: beams [Re: mousetrap]  
Joined: May 2004
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stillbitten Offline
Pooh-Bah
stillbitten  Offline
Pooh-Bah

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Gippsland Lakes Victoria Aust...
Hi Dave,

Nothing in the building restrictions that I can see regarding grade of alloy. The following is the only applicable part I can see that effects beam materials.

"The main beam and rear beam shall each be of straight aluminium alloy of constant section along its length. Holes may be drilled in the beams for fastenings only. Holes remaining after the removal of redundant fittings are permitted.
6.2
The main and rear beam shall be; a rectangular hollow section 50 mm plus or minus 1 mm by 39 mm plus or minus 1 mm by minimum 3 mm wall. Beam edges may be rounded to a maximum of 2 mm radius."

From my experience this size only leaves Mossies with a choice of a standard section from Capral, available at most alloy fabricators/sellers around the country. Though it does come in a choice? of internal corners rounded or not, rounded internal corners is preferrable, in particular if you are not bolting beams right through.

Have you found a alternative in this size?



Regards Gary.
Mosquito 1830
All opions expressed in this post are mine and mine alone, no assumptions should be made regarding any Associations or Clubs I may be a member of.
#272760 - 05/25/14 07:00 AM Re: beams [Re: mousetrap]  
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Matt_Stone Offline
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I have just bought beams for myself from capral and cost $72 for a 6.5M lenght 50.8 x 39.2 x 3mm untreated and pick up. it has internal radius.

Matt

Last edited by Matt_Stone; 05/25/14 07:01 AM.
#272763 - 05/25/14 07:12 AM Re: beams [Re: Matt_Stone]  
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Pirate Offline
old hand
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Victoria Australia
Good price Matt, I expected it to be more than that for a full length shocked

Does the association carry the beams ?
(Reason I ask is I need 2new beams for 1740 and I also want a new mast aswell, killing two birds here wink )


Yar, & this ere post be done without a sin'le drop o' rum passin' me lips

Kingy
started with Impara Cadet #3 / Mosquito #245
& now Mosquitos #1182 & #1740

#272764 - 05/25/14 07:39 AM Re: beams [Re: mousetrap]  
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Matt_Stone Offline
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Mast batch should of been ordered (ill follow it up)
Yes the assoc do stock beams (i dont think we have any in stock. If not will be ordered with masts)

Matt

#272768 - 05/25/14 10:03 AM Re: beams [Re: Matt_Stone]  
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mousetrap Offline
stranger
mousetrap  Offline
stranger

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Warners bay , nsw , Australia
Was not sure if there were different grades of alloy as there is with stainless steel. Good tip on the internal round, I would not have thought of that. At that price I will be re-beaming next weekend. Thanks for the replies.


Cheers,Dave.
CHA-CHING 922
BITE ME 1749
#272785 - 05/26/14 02:36 AM Re: beams [Re: mousetrap]  
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stillbitten Offline
Pooh-Bah
stillbitten  Offline
Pooh-Bah

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Gippsland Lakes Victoria Aust...
Hi Dave,

What boat are you re beaming? I thought we did all 3 Mossies I got from Port Lincoln 1747,1749 & 1760, remember buying a number of lengths of beam section from local alloy supplier, even had some left over, in fact sold the last left over beam to Matt a while back.


Regards Gary.
Mosquito 1830
All opions expressed in this post are mine and mine alone, no assumptions should be made regarding any Associations or Clubs I may be a member of.
#272833 - 05/28/14 08:01 AM Re: beams [Re: stillbitten]  
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mousetrap Offline
stranger
mousetrap  Offline
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Warners bay , nsw , Australia
Hi Gary
Re-beaming 1749 "BITE ME". Found a small hairline crack 5mm inboard side of where the tie bolts to the main beam. Small amount of corrosion looks like the cause.


Cheers,Dave.
CHA-CHING 922
BITE ME 1749
#272863 - 05/29/14 02:37 AM Re: beams [Re: mousetrap]  
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stillbitten Offline
Pooh-Bah
stillbitten  Offline
Pooh-Bah

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Gippsland Lakes Victoria Aust...
The joy of getting older can't remember stuff blush , obviously didn't re beam 1749 frown


Regards Gary.
Mosquito 1830
All opions expressed in this post are mine and mine alone, no assumptions should be made regarding any Associations or Clubs I may be a member of.
#272865 - 05/29/14 06:20 AM Re: beams [Re: mousetrap]  
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Matt_Stone Offline
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hmmm thats where daniels cracked too, put a 20x40x3mm plate/ washer on the strap when bolting on to the beam.

Matt

#273442 - 06/25/14 12:49 AM Re: beams [Re: Matt_Stone]  
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aparkfind Offline
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California
Originally Posted by Matt_Stone
hmmm thats where daniels cracked too, put a 20x40x3mm plate/ washer on the strap when bolting on to the cross beam .

Matt


Agree with the mate about aluminium cross beams .

Last edited by aparkfind; 06/25/14 12:50 AM.
#273695 - 07/04/14 02:10 AM Re: beams [Re: aparkfind]  
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Got Wood Offline
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Got Wood  Offline
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Just out of interest in regard to the mast sections from the association, are they anodised? or natural?

Cheers


Taipan AUS329 'Got Wood'
Mosquito 752 'Sticky Finger'
HARDWOOD RACING TEAM
#273711 - 07/04/14 05:36 PM Re: beams [Re: mousetrap]  
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Matt_Stone Offline
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anodised

#274063 - 07/21/14 07:53 PM Re: beams [Re: Matt_Stone]  
Joined: Apr 2014
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SFJF 1747 Offline
stranger
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Hey Matt,

I'm in the process of replacing the rear beam on 1747. (PS. for Gary: 1747 rear beam was definitely not replaced!)

Does the Capral section you bought have an external radius too? I've got Nic's boat at my place and his seems to have a small radius on the outer edges also which is a nice detail. ( I think PhilWS beamed his so I would assume the assoc supplied these?)

Is there assoc. stock available and are they anodized? Either way I need to get some beams over the next few weeks.

Cheers
Doug

Attached Files
beam.JPG (166 downloads)
#274067 - 07/22/14 04:37 AM Re: beams [Re: SFJF 1747]  
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stillbitten Offline
Pooh-Bah
stillbitten  Offline
Pooh-Bah

Joined: May 2004
Posts: 1,632
Gippsland Lakes Victoria Aust...
Hi Doug,

No need to rub it in, I thought we had established the fact I don't have a memory cry.

The Capral section doesn't have a radius on outside corners. Phil WS does this himself before he gets them anodised, to supply on the boats he sells (which are not sold by the association).

On the beams I did replace, 1760 and confused. I did the radius myself, it's not that difficult, I did a lot of it with sandpaper, before anodising. Getting them anodised is not difficult in the Eastern Suburbs (mine where done around Cheltenham Road I think?) as long as you are not in a rush and can wait till they have enough for a bath lot.

Contact Phillip WS direct to check if VMCA has any beams For Sale and if they are anodised.


Regards Gary.
Mosquito 1830
All opions expressed in this post are mine and mine alone, no assumptions should be made regarding any Associations or Clubs I may be a member of.
#274087 - 07/22/14 05:42 PM Re: beams [Re: mousetrap]  
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Matt_Stone Offline
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Matt_Stone  Offline
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Hi Doug, as Gary said, I do also radius the edge with a fine flapper disc on grinder then go with the grain with scotch brute pad to clean all grease and make it smooth ready for anodizing, I do have a section at home I could sell you a beam or make one up for u
Matt

#274088 - 07/22/14 05:43 PM Re: beams [Re: mousetrap]  
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Matt_Stone Offline
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Matt_Stone  Offline
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Also I can get it anodized for you about$60

#274089 - 07/22/14 06:15 PM Re: beams [Re: mousetrap]  
Joined: Apr 2014
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SFJF 1747 Offline
stranger
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Thanks gents grin

#274093 - 07/22/14 10:54 PM Re: beams [Re: mousetrap]  
Joined: Apr 2013
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Pirate Offline
old hand
Pirate  Offline
old hand

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Posts: 858
Victoria Australia
2 questions .....

1/
Is it within the rules to "radius" the beams ?
I know there's a limit on the deck/hull radius, so logic would suggest ...


2/
Wouldn't it be best to actually fit the beams to the boat and also the associated hardware (IE: trampoline, traveler bar, dolphin striker etc etc)
And then strip it all off and THEN get it anadosied ????

Cant see the sense in drilling holes and exposing raw alloy after the anadosing

Reason I ask is.....
1182 has an anodised rear beam and a 'painted' front beam, the rear looks a treat until you remove a component (in my case the traveler bar), the corrosion around the holes that were obviously drilled post anodising is a concern, and yet the corrosion on the pained front beam is probably less in comparision
(more on this comming to Shy's thread soon).......

wink



Last edited by PIRATE; 07/22/14 11:00 PM. Reason: Cause the "smart-phone" aint !!!

Yar, & this ere post be done without a sin'le drop o' rum passin' me lips

Kingy
started with Impara Cadet #3 / Mosquito #245
& now Mosquitos #1182 & #1740

#274105 - 07/23/14 04:55 PM Re: beams [Re: mousetrap]  
Joined: Jan 2007
Posts: 81
Sixth Element Offline
journeyman
Sixth Element  Offline
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Posts: 81
To windward of you!
Yes there is a rule on radius of the beams. Rule 6.2.
I would suggest it is a good idea for everyone to read through the rules at some stage. If you read the rules and check your own boat it saves the embarrasment when it doesnt measure at a regatta.

http://www.theracingcat.com/uploads/Mosquito_BRR.pdf


"Sixth Element"
1782 MK2 w/spinnaker.
Lake Bonney Y.C.
National Sec. / S.A President / S.A Measurer / Commodore LBYC
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