I'm asking because I'm trying to figure out what Spinnaker I have on my N570. I suspect it's an F18 but I need to verify, I'm hoping my current spin is slightly larger than a typical F18 spin, blown out perhaps. I'm having problems getting my current spin setup with the right luff tension. So by getting an F18 spin I would solve my problem.

If an F18 is larger than my current spin I guess I need to look at an F17...

Does anyone know the luff length of an F17 spin?