Hi guys,

I wonder if anyone has any thoughts on why my new home-built spinnaker is not particularly stable when flying. The luff is constantly collapsing - the slightest change in momentum or wind/ boat direction and it folds. The luff, leech and foot lengths are all within a couple of cms or so of my Landy kite although it is much flatter than that spin.

Once it is flying the spin seems to be developing loads of power, it's just so fragile.

I've tried altering the hoist height, both longer and shorter. To a lesser extent I've played around with the sheeting angle. Now the damn thing is really starting to frustrate me as I can't see what the problem is.

I'm wondering whether I need to cut some more round into the luff to make the entry flatter?

Here are a couple of pics: