Latest News: Forums Cruising helyar mark 1 roller reefing Re: Re: helyar mark 1 roller reefing

#10214
Swiebertje
Participant

Maybe this link helps?
(PDF allert!)

Meanwhile Ralph has improved the design. The clamp (fig 5 #7) has gone. He now uses a direct crimp technique to connect the eye to the carbon tube. also he has moved from longitudinal fibres to diagonally crossed fibres in the carbon tube. The original tube could theoretically break under high torsion stresses, not the new cross grain one.

Correct me if I am wrong but the only down side I saw was the use of the 2.5 mm SS wire, though it was 1 x 19 which is already stronger then the normal Wayfarer luff wire (7 x 19). This size of wire still forces us to use a stay with ‘mickey mouse’ gadgets to keep it from getting caught by the sail when it is rolled. A 3 mm 1 x 19 wire (or better, a 4 mm one, like my Bartels furler) would void the need of a stay all together. Except perhaps a short one, running from the mast to the top swivel as a safety wire. The wire luff, drum and swivel would then be 4 times stronger then an original luff wire (or the stay) and the only thing that can break is the Genoa halyard.

Having said that, the aero luff is a great improvement over existing systems and it is much more cost effective then the Bartels system that I still use with great pleasure. Even with the added costs of a Harken heavy load drum and swivel it is cheaper then the Bartels solution. If I were to do it again I would choose the Aeroluff spar without hesitation.

More information to be obtained from Ralph Roberts, inventor, intrepid Wayfarer sailor and UKWA exec.

Some info:
Bartels drum and swivel: MBL 20 KN SWL 10 KN
Harken High load drum and swivel: MBL: 8.9 KN SWL: 4.2 KN

2.5 mm SS wire (7 x 19): MBL: 3.2 KN SWL: 0.54 KN
3 mm SS wire (7 x 19): MBL 4.7 KN SWL: 0.79 KN
4 mm SS wire (7 x 19): MBL: 8.3 KN SWL: 1.4 KN

2.5 mm SS wire (1 x 19): MBL: 5.2 KN SWL: 0.86 KN
3 mm SS wire (1 x 19): MBL: 7.4 KN SWL: 1.2 KN
4 mm SS wire (1 x 19: MBL: 13.2 KN SWL: 2.2 KN

SWL = Safe working load
MBL = Minimum breaking load