I just had a new 155 built for my Pearson 30 by a reputable loft.
I have been out twice with it, and cannot get the leech to stop flapping violently.
Even our P30's original 32 year old Dacron sails' leechs don't "flap violently." "Flutter vigorously," is more like it.
In 10 kts of wind, close-hauled, I was able to completely
quell the fluttering on our old #3 last Sunday by just tightening the leech line a bit. IIRC, from last season, our old #1 behaves similarly.
IIRC: Racing in 20-25 kts with 25-30 kt gusts last fall, flying the old #3, I wasn't able to quell the leech fluttering completely. But again: It was more like vigorous fluttering than violent flapping.
When I'm close hauled and have the lead car set so that the telltales are all happy, the aft 10 inches or so of the sail flaps violently. It's more than a leechline adjustment could ever cure.
When sailing downwind, the sail fills nicely, but the leech is all wavy.
This sounds quite wrong.
Is there possibly something I'm not considering related to the rig or tuning, did they mess this up?
Assuming the luff is tight and the car is adjusted such that both the top and bottom luff tell-tales start fluttering at the same time when you begin to stall the sail: Doesn't sound like it.
We've only flown one of the new 155s, the light air (Mylar) one, so far, and that was last season, but I don't recall having to touch the leech line.