| Re: beams
[Re: mousetrap]
#272757 05/25/14 03:19 AM 05/25/14 03:19 AM | thricebitten
Unregistered
| thricebitten
Unregistered | 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?
| | | Re: beams
[Re: mousetrap]
#272760 05/25/14 07:00 AM 05/25/14 07:00 AM |
Joined: May 2007 Posts: 416 Matt_Stone
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Posts: 416 | 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.
| | | Re: beams
[Re: Matt_Stone]
#272763 05/25/14 07:12 AM 05/25/14 07:12 AM |
Joined: Apr 2013 Posts: 858 Victoria Australia Pirate
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old hand
Joined: Apr 2013
Posts: 858 Victoria Australia | Good price Matt, I expected it to be more than that for a full length 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 wink](/forum/images/graemlins/default/wink.gif) ) 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 | | | Re: beams
[Re: Matt_Stone]
#272768 05/25/14 10:03 AM 05/25/14 10:03 AM |
Joined: Apr 2012 Posts: 11 Warners bay , nsw , Australia mousetrap OP
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OP
stranger
Joined: Apr 2012
Posts: 11 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
| | | Re: beams
[Re: mousetrap]
#272785 05/26/14 02:36 AM 05/26/14 02:36 AM | thricebitten
Unregistered
| thricebitten
Unregistered | 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. | | | Re: beams
[Re: ]
#272833 05/28/14 08:01 AM 05/28/14 08:01 AM |
Joined: Apr 2012 Posts: 11 Warners bay , nsw , Australia mousetrap OP
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Joined: Apr 2012
Posts: 11 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
| | | Re: beams
[Re: mousetrap]
#272863 05/29/14 02:37 AM 05/29/14 02:37 AM | thricebitten
Unregistered
| thricebitten
Unregistered | The joy of getting older can't remember stuff ![blush blush](/forum/images/graemlins/default/blush.gif) , obviously didn't re beam 1749 | | | Re: beams
[Re: Matt_Stone]
#273442 06/25/14 12:49 AM 06/25/14 12:49 AM |
Joined: Jun 2014 Posts: 1 California aparkfind
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stranger
Joined: Jun 2014
Posts: 1 California | 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.
| | | Re: beams
[Re: aparkfind]
#273695 07/04/14 02:10 AM 07/04/14 02:10 AM |
Joined: Jun 2009 Posts: 76 Got Wood
journeyman
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journeyman
Joined: Jun 2009
Posts: 76 | 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
| | | Re: beams
[Re: mousetrap]
#273711 07/04/14 05:36 PM 07/04/14 05:36 PM |
Joined: May 2007 Posts: 416 Matt_Stone
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Posts: 416 | | | | Re: beams
[Re: SFJF 1747]
#274067 07/22/14 04:37 AM 07/22/14 04:37 AM | thricebitten
Unregistered
| thricebitten
Unregistered | Hi Doug, No need to rub it in, I thought we had established the fact I don't have a memory ![cry cry](/forum/images/graemlins/default/cry.gif) . 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 confused](/forum/images/graemlins/default/confused.gif) . 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. | | | Re: beams
[Re: mousetrap]
#274093 07/22/14 10:54 PM 07/22/14 10:54 PM |
Joined: Apr 2013 Posts: 858 Victoria Australia Pirate
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Joined: Apr 2013
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 wink](/forum/images/graemlins/default/wink.gif)
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 | | | Re: beams
[Re: mousetrap]
#274105 07/23/14 04:55 PM 07/23/14 04:55 PM |
Joined: Jan 2007 Posts: 81 To windward of you! Sixth Element
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journeyman
Joined: Jan 2007
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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