Hi David
Just some food for thought about the H20 mast and potential sail plan revisions.

I believe the presence of a comp tip is a real challenge for a sail maker in designing a square top sail. If the rumor mill was accurate. The Hobie Fox suffered in the US because it also had a comp tip and the development of the sail never quite got it right (flexi tip caused the leech to open prematurely). Alternatively, the head to head with the I20 always demonstrated that the larger sails on the I20 trumped the Fox's F20 sail plan. The San Diego sailors should be able to comment on the Fox with a comp tip and the square top and spin versus the I20.

I have never seen a Fox on the water so I have absolutely no first hand knowledge if any of this proved to be true.

Finally with respect to spin size. Texel and ISAF seem to favor 24 sq meter chutes for 20 foot boats. The Tornado chute of 25 sq is considered oversized by texel. The I20 chute is 24 sq meters and the NE 100 chute of 28 sq if memory is correct.

For what its worth... the 25 sq m chutes are hard work in a breeze (you don't want to do 4 hours of racing with them)

The NE 100 chutes frequently use a doublers for distance races. (not double ratchets).

Finally, the High aspect jibs on the Tornado and I 20 are useless going downwind alone without a chute. (That's why you will see the I20's avoid hot reaches to sail high and then pop the chute to get down on odd ball courses.)

Take Care
Mark