Seajet
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Faster than an Anderson 22, probably!
Well it should be at 25' with racing pretensions and giving up a lot of the versatility of the A22 ! I'd be surprised if the Spring is as good to windward in a blow.
As for form stability the A22 has a lot of this - as well as deeply situated ballast stability - but remains balanced when heeled.
Mini Transat boats are a very different beast, and very specialised; losing a rudder is just a risk they are willing to take.