Which stock rudders did you have ?
The ones with the alu stocks ? The NACA profiles.
Or the newer ones of AHPC (since 2002) with the DACA profiles.
Personally I dislike the older standard rudderboards and think the newer DACA sections to be significantly better. Still the Blade uses an even better profile (no noice as the AHPC ones) and I'm thinking about upgrading to those.
What profile are the M20 ones. NACA or DACA ?
Wouter
I'm not sure which profile the old rudders were, but they were built about 2000, so must be the NACA section. The Alu sock is a [censored] design also, heaps of play in the blade/stock fitting.
I think the M20 blades are an NFI section (No [censored] Idea!!) they look a lot like the T blades but with less chord and a slightly less prominent hollow in the rear 1/3 of the blade.
Hollow in rear 1/3 of board = DACA profile. NACA don't have that.
I understand what you mean. I like the DACA profiles alot better. Board don't stall easily and you really turn them and pull the boat around without much fear of stalling them. It feels like the grip (bite) the water much better. That is unless the cord on them is too small. I think the I-20's suffered from that last issue before they went to the newer and larger cord rudder boards.
Wouter
Any on-line references to DACA profiles?
Nice rudderheads on the foils you bought, all carbon foils I assume? Wonder what the principle for the kick-up system is..
Macca, have you been able to compare straight line speed for the super-taipan vs. an equally skilled Tornado?
Cool to hear that you are getting back on a Tornado! (I assume you are going to sail the boat you ordered from Marstrøm yourself).
Ref: http:/
In the background, what are the fabric-samples hanging on the wall doing there?? 
We are racing the boat against an OK tornado today I hope, so should have a good idea shortly. But I expect that it will be quicker, it just feels like it is accelerating much more through the gusts.
I bought a 2 year old Tornado of a mate (Jojo Polgar) and ordered a new carbon rig from Marstrom, the whole lot gets here in a few weeks.
The fabric is the background is from my Taipan crews work. Hence I have the most expensive rudder covers you can imagine!!
No tornado today, but there was a well sailed capricornand some A class too.
in a 40 min race (10 - 14kts) we beat the Capricorn by nearly 5 mins, same story in the second race.
We used the T hcp of 65 and the Capricorn was on 70 so it was a big difference. we won on hcp in both races.
Macca, how about a report from the Forster Wildcat regatta?
I understand that you have some tuning/teething issues from your post on the F-16 forum.
How do you like your Maxx carbon sails after some sailing? Still holding their shape and good leech control?
We have been playing with the mast to get a wider range in which the boat is quick. The basic issue is that the mast is very stiff and we have limited luff curve to play with so we have tried running with a slightly softer diamond setting and also with less spreader rake, both resulted in improved performance in certain conditions but reduced in others. It has been hard finding a happy medium but I think we are getting closer. When the boat is in the groove it is very quick it just takes a bit to get it there. I guess it's to be expected with such a new thing.
The sails are still very nice, super smooth and easy to trim. hard to say how they are lasting as we have only really sailed the boat half a dozen times. Interestingly I did the Sydney 38 state titles on the weekend just gone, I have all Maxx sails on the boat now (used to have jibs only but just took delivery of a new Maxx mainsail) and we had heaps of boatspeed (we won the regatta) The amazing thing is that all the other boats had new jibs and ours were exactly one year old! from that I would think that the Taipan sails will last very well.
Thanks, please keep us posted! I would really like to see you succed with this project.
We have all Maxx sails on our T now, but I think the Pen09 cloth is a bit on the light side for the mainsail (T-class rules doesn't allow heavier Maxx cloths). Agree on the trimming comment, very nice to trim and soft enough to show eventual backwind etc.
Here we are, mixing it up with some leadswingers with our new 'cross-cut' Maxx sails.
http:/