[frers-list]Rig tensions
Dave Nauber
frers-list@lists.frers33.com
Wed, 1 Oct 2014 11:14:07 -0400
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Wolverine uses Euler=B4s Equations to compute rig tension, but sighting up =
the mast is good too.=20
=20
David Nauber
President
Class=E9
C: 860-301-7011 | classeaudio.com
B&W Group Canada | 5070 Fran=E7ois Cusson | Lachine | QC | H8T 1B3
Follow Bowers & Wilkins on: facebook.com/bowerswilkins | twitter.com/bowers=
_wilkins | youtube.com/bowerswilkins
This email message is confidential and for use by the addressee only. Publi=
cation of its contents in whole or in part in any medium (including electro=
nic means such as e-mail and web-sites) is expressly forbidden without prio=
r written consent. B&W Group Ltd does not accept responsibility for any cha=
nges made to this message after it was sent. The views expressed in this do=
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ly its endorsement or recommendation by B&W Group Ltd.=20
=20
From: frers-list-admin@lists.frers33.com [mailto:frers-list-admin@lists.fre=
rs33.com] On Behalf Of Edgar Smith
Sent: Wednesday, October 01, 2014 11:04 AM
To: frers-list@lists.frers33.com
Subject: [frers-list]Rig tensions
=20
Hi Mike:
=20
Sounds like you'll be racing your boat, always good to hear. I also came fr=
om a J-boat and I think you'll find the Frers mast is actually easier to tu=
ne. We got the forestay length and rake from the tuning guide and centered =
the mast before blocking. Then the shrouds were just a matter of sighting u=
p the mast while under sail. First we tension the uppers a few turns with a=
wrench after hand tight. Then I work down, keeping the mast in column at t=
he dock keeping the intermediates and lowers both a bit looser than the upp=
ers. The goal is tight enough that the leeward upper does not go particular=
ly slack in moderate breeze. I don't see any value in more tension than tha=
t. Because the shrouds are not swept back by more than an few inches, you a=
re not controlling fore and aft mast bend with them. So it's really just a =
matter of going for a sail and making some adjustments to keep it straight =
under load. I sight with mast straight - minimal backstay and runner on so =
it is easier to judge if the mast is, hooking, falling off or just bending =
in column. I haven't seen the need for a Loos gauge. Finally if the breeze =
is really on we might take two turns on the headstay and one extra turn on =
the uppers before a race.=20
=20
Does anybody take a more scientific approach than we do?
=20
=20
Edgar Smith
Pachyderm=
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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue vli=
nk=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span style=3D'f=
ont-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Wolverine=
uses Euler’s Equations to compute rig tension, but sighting up the m=
ast is good too. <o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'=
font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p>&nb=
sp;</o:p></span></p><div><p class=3DMsoNormal style=3D'text-autospace:none'=
><b><span style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";colo=
r:gray'>David Nauber</span></b><span style=3D'font-size:10.0pt;font-family:=
"Tahoma","sans-serif";color:gray'><br></span><span style=3D'font-size:10.0p=
t;font-family:"Verdana","sans-serif";color:gray'>President<br>Class=E9</spa=
n><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif";color:g=
ray'><br></span><span style=3D'font-size:7.5pt;font-family:"Tahoma","sans-s=
erif";color:gray'><br></span><span style=3D'font-size:10.0pt;font-family:"V=
erdana","sans-serif";color:gray'>C: 860-301-7011 | classeaudio.com<br>B&=
;W Group Canada | 5070 Fran=E7ois Cusson | Lachine | QC | H8T 1B3</span><sp=
an style=3D'font-size:8.5pt;font-family:"MS Shell Dlg","sans-serif";color:#=
1F497D'><o:p></o:p></span></p><p class=3DMsoNormal style=3D'margin-bottom:1=
2.0pt'><span style=3D'font-size:9.0pt;font-family:"Verdana","sans-serif";co=
lor:#6E6F71'>Follow Bowers & Wilkins on: facebook.com/bowerswilkins | t=
witter.com/bowers_wilkins | youtube.com/bowerswilkins</span><span style=3D'=
font-size:7.5pt;font-family:"Verdana","sans-serif";color:gray'><br><br>This=
email message is confidential and for use by the addressee only. Publicati=
on of its contents in whole or in part in any medium (including electronic =
means such as e-mail and web-sites) is expressly forbidden without prior wr=
itten consent. B&W Group Ltd does not accept responsibility for any cha=
nges made to this message after it was sent. The views expressed in this do=
cument are that of the individual and may not necessarily constitute or imp=
ly its endorsement or recommendation by B&W Group Ltd. </span><span sty=
le=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black'><o:p>=
</o:p></span></p></div><p class=3DMsoNormal><span style=3D'font-size:11.0pt=
;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span>=
</p><div><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3=
.0pt 0in 0in 0in'><p class=3DMsoNormal><b><span style=3D'font-size:10.0pt;f=
ont-family:"Tahoma","sans-serif"'>From:</span></b><span style=3D'font-size:=
10.0pt;font-family:"Tahoma","sans-serif"'> frers-list-admin@lists.frers33.c=
om [mailto:frers-list-admin@lists.frers33.com] <b>On Behalf Of </b>Edgar Sm=
ith<br><b>Sent:</b> Wednesday, October 01, 2014 11:04 AM<br><b>To:</b> frer=
s-list@lists.frers33.com<br><b>Subject:</b> [frers-list]Rig tensions<o:p></=
o:p></span></p></div></div><p class=3DMsoNormal><o:p> </o:p></p><p cla=
ss=3DMsoNormal>Hi Mike:<o:p></o:p></p><div><p class=3DMsoNormal><o:p> =
</o:p></p></div><div><p class=3DMsoNormal>Sounds like you'll be racing your=
boat, always good to hear. I also came from a J-boat and I think you'll fi=
nd the Frers mast is actually easier to tune. We got the forestay length an=
d rake from the tuning guide and centered the mast before blocking. Then th=
e shrouds were just a matter of sighting up the mast while under sail. Firs=
t we tension the uppers a few turns with a wrench after hand tight. Th=
en I work down, keeping the mast in column at the dock keeping the intermed=
iates and lowers both a bit looser than the uppers. The goal is tight =
enough that the leeward upper does not go particularly slack in moderate br=
eeze. I don't see any value in more tension than that. Because the shrouds =
are not swept back by more than an few inches, you are not controlling fore=
and aft mast bend with them. So it's really just a matter of going for a s=
ail and making some adjustments to keep it straight under load. I sight wit=
h mast straight - minimal backstay and runner on so it is easier to judge i=
f the mast is, hooking, falling off or just bending in column. I haven't se=
en the need for a Loos gauge. Finally if the breeze is really on we might t=
ake two turns on the headstay and one extra turn on the uppers before a rac=
e. <o:p></o:p></p></div><div><p class=3DMsoNormal><o:p> </o:p></p=
></div><div><p class=3DMsoNormal>Does anybody take a more scientific approa=
ch than we do?<o:p></o:p></p></div><div><p class=3DMsoNormal><o:p> </o=
:p></p></div><div><p class=3DMsoNormal><o:p> </o:p></p><div><p class=
=3DMsoNormal><span class=3Dapple-style-span><span style=3D'font-size:13.5pt=
;font-family:"Verdana","sans-serif";color:black'>Edgar Smith</span></span><=
o:p></o:p></p></div><div><p class=3DMsoNormal><span class=3Dapple-style-spa=
n><span style=3D'font-size:13.5pt;font-family:"Verdana","sans-serif";color:=
black'>Pachyderm</span></span><span style=3D'font-size:13.5pt;font-family:"=
Verdana","sans-serif";color:black'><br><br></span><o:p></o:p></p></div></di=
v></div></body></html>=
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