Philippe Candelier

April 13, 2017 “I have a mast with 2 levels of spreaders, straight spreaders (non front pushing). Sighting up the mast under sail, starting with 10 kn wind, I can see the mast head shifting laterally leeward. Cap shrouds are already very tight. What else can I check? How much should I tolerate for the mast head to shift? Does 1 mast diameter is too much with 15-18 kn of Wind?”

David Flynn

April 18, 2017 Quantum Expert Answer

Having your tip fall off in 10+ knots of breeze is not desirable on any rig, especially not with an inline two spreader configuration. One thing that may be causing this is too much diagonal tension. This will pull the mid-sections of the mast to weather and make it seem like the top is falling off.

I would start by easing D 1, 2s, and 3s to the point where you see visible sag to leeward at their attachment points. Then make sure the top is staying in the center. You will need more tension than you might imagine. If you feel the uppers on the leeward side when you're sailing up wind, they should still be rock tight. The top of rigging makes a difference. Rod is much easier to get tuned and tensioned than standard wire. With the top in the center tune from the top down. Add just enough diagonal tension at each station to bring the mast in column. I hope that helps and feel free to let us know if you have any further questions!

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