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Issues with mastcollar blocks from Sparcraft?

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skipper View Drop Down
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Joined: 16 February 2008
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    Posted: 19 June 2011 at 09:21
"Don't fix it if it ain't broken" and "Better be safe than sorry" is something I am considering right now when preparing for a shorthanded competition.Confused
 
On our 342 from 2005 do we have:
  • 6 x mastcollar blocks from Sparcraft, sheaves diameter 45 mm, supporting line max 12 mm.
    Possible product number 48214000SC3, type SC45
  • Main sheet blocks is Lewmar Synchro 72
  • There are also 2 Lewmar Synchro 72 blocks at the mast base for one mainsail reef and the vang
I have read a number of discussion threads regarding "exploding" mast collar blocks and when giving this a second thought I started to see a possible pattern.
 
Hanse Yacht have over time been using different brands of mastcollar blocks!?
 
Could it be true that Sparcraft mastcollar blocks have not crashed/exploded at all !?
 
When reading Sparcraft document about our mast profile I330 do they refere to block SC58 (58 mm sheave) which is one size larger than the delivered one from Hanse Yacht. http://www.sparcraft-us.com/us/technical_support/technical_brochures/ocean_range/fichiers/mast_steps.pdf
(Z Spars 45 mm block has SWL 550 kg, 60 mm block has SWL 900 kg as a reference.)
 
Elasticity is also one factor that can have impact on block loads, original sheets could reduce the shock loads and with stronger sheets made of Dynema the shock load should in theory be higher.


Edited by skipper - 19 June 2011 at 19:18
Cheers,
Skipper
Hanse 342 2005 (Sparcraft mast, white hull, wheel steering, deep draft keel, short rudder)
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