"All the Model Cats I've ever seend documented use a single swinging keel that "rests" on the leaward hull (or maybe on a prodder) to privide the righting moment so ir takes virtually no wind to fly the hull and then the keel becomes "engaged"

Scooby, if you could be so kind as to attach a pic/drawing of what you just described, I`m battling to imagine it.

Cheers
Steve