Oct 03, 2007 · In the 1960s, I persuaded my father to invest in a Formula 233 based on advertisements in Yachting heralding the boat's successful race campaign. Racer Don Aronow had commissioned marine engineer Jim Wynne to design the boat, which proved so successful Aronow launched Formula Marine. The boatbuilder ... 23' 1980 Formula Thunderbird F-233 C for sale in Meeks Bay, California $8,000 Share it or review it ... BOAT OWNER'S NOTES for 1980, FORMULA Thunderbird in Excellent ... Original Manufacturer / Promotional Brochure Date: 1982 Pages: 25 in Color Size: 8.5 x 11 opens to 11 x 17 Condition: C8, Excellent Brochure Covers: Formula One, Two, 233LS, 255LS, 302LS, 302 SR1, 23 Sportsman, 233 Sportsman, 233 Open Sportsman, 233 Islander, 23 SC Express, 25 SC Express, 255 Freedom, 26 SC Express, 31 SC Express & 402 SC1 May 13, 2009 · 1981 23' Formula Thunderbird Cuddy. Hull is solid and engine runs good. Single 235 Evinrude around 90 model. Gill bracket and new jack plate. Boat could use some small things, but is basically ready to go. Fresh compression check and carb cleaning. New water pump. We were getting ready for the season and came across another deal. New prop. Re: Thunderbird/Formula model question Signa is the boat brand that the Porter family owned before coming out with the Formula brand. I cannot recall if they bought Formula from someone originally. I think they did. Anyway, their primary company name has been Thunderbird products.