Bending the mast

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Interim
Engineer
Posts: 198
Joined: Thu May 08, 2014 9:31 am
Sailboat: MacGregor 26S
Location: Great Plains

Bending the mast

Post by Interim » Tue Jun 25, 2019 9:20 am

My mainsail is a bit saggy from the luff to the chord. It is not luffing, just a bit untaught on a close reach.

It is a new sail, so this should be a matter of tuning the rig. I think I need to put a little bend in the mast to pull the belly forward and flatten it.

Is the best approach to tighten the backstay?

--john

THE CUSCUS
First Officer
Posts: 331
Joined: Fri Sep 11, 2009 9:59 am
Sailboat: Venture 25
Location: North East River, MD

Re: Bending the mast

Post by THE CUSCUS » Wed Jun 26, 2019 11:43 am

Is your backstay adjustable? most Macs aren't. Do you have a boom vang or Cunningham? Also, is your luff tensioned enough?

Interim
Engineer
Posts: 198
Joined: Thu May 08, 2014 9:31 am
Sailboat: MacGregor 26S
Location: Great Plains

Re: Bending the mast

Post by Interim » Wed Jun 26, 2019 1:45 pm

The luff is tensioned enough.

I have a boom vang, used mostly for down wind, but have not employed the cunningham. (sail and mast are rigged; captain has been too lazy to go forward).

The backstay is not adjustable while underway, but the connection at the chainplate has multiple holes so I can change the length of the stay.

I'll try the cunningham this weekend and report back.

--john

Sisu
Chief Steward
Posts: 61
Joined: Tue Dec 08, 2015 9:58 am
Sailboat: MacGregor 25
Location: Oshkosh, WI

Re: Bending the mast

Post by Sisu » Wed Aug 14, 2019 10:50 am

Easy enough to make your backstay adjustable, too - just cut it a few feet shorter, re-swage the eye, and add a 4:1 or 5:1 purchase in the space you just created. BWY also sells a kit.

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Tomfoolery
Admiral
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Joined: Tue Jul 05, 2011 9:42 am
Sailboat: MacGregor 26X
Location: Rochester, NY '99X BF50 'Tomfoolery'

Re: Bending the mast

Post by Tomfoolery » Wed Aug 14, 2019 11:26 am

Sisu wrote:
Wed Aug 14, 2019 10:50 am
Easy enough to make your backstay adjustable, too - just cut it a few feet shorter, re-swage the eye, and add a 4:1 or 5:1 purchase in the space you just created. BWY also sells a kit.
Or upgrade your main sheet fiddle block setup to ball bearing fiddle blocks (which BWY also sells, and which I own :) ), and use the old set for the backstay.

If that's not enough, use a single sheave block on the backstay, anchor one end of that line to the tang on the coaming, and use the 4:1 block and fall to the other end of the line. Voila! 8:1 backstay tensioner. 8)

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