Your correct on the 25cc for the models Hoyt. I checked on several Y class hydros on the vintage hydro web site, and the original Crosley was 44ci...
Enlarge model hydroplane plan Thanks for your reply Hoyt. The enlarged plan would be a APBA Y class Henry Lauterbach 12'x5' hydroplane powered by...
I have plans for a 48" inboard hydro. If these plans were enlarged x3 would the 12' boat be safe to drive at flyby speed.Thanks, Ted.