Hi Martin.
The 2mm should make no difference provided the rudder is vertical. If your not sure, post a pic.
I notice that you have a flat bottom
on your hull. Are you adding rails. If not the boat will not lift easily. This has the ADVANTAGE of adding stability but will also slow the boat due to increased surface area drag. If you add rails, the hull lifts easier and becomes faster. There are two ways to add rails, (normally using balsa strip of the wing trailing edge type) 1. step inwards which gives better lift but is more directional. Great on straights but difficult to control the turns, and 2. step outwards which gives less lift but better turns as it inhibits sliding - its also easier to mould when using grp.
Hope you're using epoxy with that Kevlar, it don't like polyester
A use woven glass tape, which I find is more than strong enough (but then I try to avoid other boats)
Hi Glenn
Yes most run 40 meg with a few diehards on 27. I've got a drawer full of little men, if you want some, PM me with your address and I'll stick a couple in the post - I paint a black bit on the top, call it a window, and now don't need little men
Just to show I've had orange boats in the past (I'm better now) ::) here's a pic of me and Mrs 85 enjoying the clouds in Wales
I know Martin's from Blackpool, where are you Glenn?
Keep smiling.
Danny
PS If either of you test in the sea, totally LATHER your boat with WD40, plus spray it through your water outlets into the head, pipe, header etc. The salt makes a right PIG of ally, brass and copper :(