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#117485 - 09/18/07 01:16 AM Mast Pre-Bend - Alter Cup Blade
LuckyDuck Offline
enthusiast

Registered: 08/21/02
Posts: 396
Loc: Annapolis Md.
OK. So I finally took time to tune my mast according to Matt's instructions after they were de-tuned for the Alter Cup. After setting everything up the last statement in the instructions is that in the end I want to achive 1" to 3/4" of prebend. Is this measured by running a string from the very end of the mast to the base or from the diamond hounds to the base? Forgive me if this has been covered already. Thanks. Ed
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Still hazey after all these beers.
F-16 Falcon #212

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#117486 - 09/18/07 01:50 AM Re: Mast Pre-Bend - Alter Cup Blade [Re: LuckyDuck]
Robi Offline
Carpal Tunnel

Registered: 07/08/04
Posts: 2718
Loc: St Petersburg FL
I think its from mast tip.

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#117487 - 09/18/07 05:20 AM Re: Mast Pre-Bend - Alter Cup Blade [Re: LuckyDuck]
Kris Hathaway Offline
addict

Registered: 10/16/02
Posts: 606
Loc: Maryland
Yikes! I thought it was the perpendicular distance from a line formed between the spreader tips to the mast at a predetermined diamond tension.

Kris

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#117488 - 09/18/07 09:19 AM Re: Mast Pre-Bend - Alter Cup Blade [Re: Kris Hathaway]
Wouter Offline
Carpal Tunnel

Registered: 06/16/01
Posts: 9582
Loc: North-West Europe


Quote:


Yikes! I thought it was the perpendicular distance from a line formed between the spreader tips to the mast at a predetermined diamond tension.




No, that is the spreader rake measurement.


For the prebend, tie a line to the mast tip and run it under the mainsail hook. Then tie the loose end off to the gooseneck, again running the line underneath it. Now lay the mast flat on it sides (or screw up your measurement) and measure the mast prebent by measuring the distance between the line and the back of the mast track IN THE HORINZONTAL plane ONLY. Most likely the mast will bend downwards and the tensioned line will be a little higher then the mast sail track.

Wouter
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Wouter Hijink
Formula 16 NED 243 (one-off; homebuild)
The Netherlands

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#117489 - 09/18/07 12:23 PM Re: Mast Pre-Bend - Alter Cup Blade [Re: Wouter]
LuckyDuck Offline
enthusiast

Registered: 08/21/02
Posts: 396
Loc: Annapolis Md.
Wouter Thanks. Laying it horizontal does make sense doesn't it. Watch out guys, I'm tuning up!! As if that will make up for sloppy mark roundings. Ed
_________________________
Still hazey after all these beers.
F-16 Falcon #212

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