I met Dan several times at the Nats in Sherman, TX. Not sure if I met Jack, but his name rings a bell. Dan was instrumental in the development of several unlimited aerobatic machines and his One-Design was certainly a unique idea and performed well, but never caught fire on the competition scene.
Here's a one-off bipe....Rory Moore's Goshawk.... 300HP unlimited machine. This was designed and built by Dan Rihn and Rich Bastian (custom aerobatic builder for many back in the day). This was all a few years before the Pitts S-1-11 "Super Stinker" came into being.
I had discussed buying the Goshawk from Rory as my Pitts was being outclassed by the big engine'd stuff coming into the sport, but he finally decided not to sell it.
Before I quit competing in '92 I had a 300HP tapered wing bipe designed by Acro Specialties, but pulled out of the project. The fuse had been completed and was sold to someone else who had other wings put on it....sorry to say it never made a good showing in competition.
Anyway....the Goshawk!