Tell me about T foil rudders.

I think that I14’s were there before N12’s.  Ref. Pressure Recovery, Frank Bethwaite talks about this with his Medium Dribbly NS14’s, by flattening the aft underwater sections the boat gets lift off the stern wave that builds up under the hull.  I borrowed this idea for my Annie Apple N12 design.  I also drew up a T-foil rudder using the I14 hub, but never had the courage of my conviction, though I did a study of the potential reduction in displacement due to lift, and there were marginal gains, I binned the idea because I calculated considerable drag at non optimal speeds. 

If you just want pitch stability you can go for much smaller foils and a fixed rudder as per the low rider moths.
If you want pressure recovery then vertical position of the foil is fairly critical.
If you simply want to reduce displacement upwind then they need to be fairly sizeable as you will be looking to lift at least your weight off of the boat.

Is the Farr a nosey boat? Doesn't look like it
Will it go fast enough to benefit from pressure recovery? Not likely as it's a short high drag hull.

Will the Farr benefit from displacement reduction? Probably

Originally posted by craiggo Is the Farr a nosey boat? Doesn't look like it Will it go fast enough to benefit from pressure recovery? Not likely as it's a short high drag hull. Will the Farr benefit from displacement reduction? Probably

I've read stories of pitch poling on Burghfield and on the sea, so yes, it is capable of them and somewhere else I read about the further back you can get the less likely you are to go over the front.

I've always wondered why nobody has fitted nose foils on the bow to help stop that.

Firstly, hats off to you for committing to a new build boat.

Thats the T-foil gone then, stick with the gantry, sods law T-foil is going to be a nightmare, you will always be conscious of it and it will spoil your fun.