I have a Blast - a little abused as it was my first Rev and I went through four center leading edge spars quite early on. I have no doubt that the sail is not as it was when new.
Since starting to fly again, I've noticed the Blast is really noisy - a bit farty, if you like. This evening I was flying on a hill in really light winds and the flutter from the trailing edge was very noticeable and came on with pretty much any forward movement. I could see it loose from the ground.
I am pretty confident that it's not line setup that's causing it - I've got a pretty good feel for how it flies and have been adjusting my grip and line lengths to a point where it feels right, I (and it) will only fly (powered, rather than floating) with appropriate tension on all four strings. With the Blast, it feels quite hard to get it wrong, if you know what I mean.
Here's what's on my mind that I'd like to run past folk here:
- leading edge bungee tension - fairly high
- vertical bottom bungees tension - fairly high
- trailing edge - flappy
If not, can you reinforce or pleat a trailing edge to take up the slack in the fabric, assuming that my power lust has stretched it? I'm not going to get a new sail for it if I can tune/adjust the frame/bungees and/or make minor modifications to the sail.
Very interested to hear anyone's comments, or to flag up topics/posts already on here that I may have missed.
[Edit - posted too soon - the following thread (Making less noise) actually already contains more appropriate discussion - recutting sail, leech lines and catenary - nevertheless, any comments on the aforementioned topics or any fresh advice?]