87 Mac D
The 87 model was a mistake from Macgregor. Due to its low coamings and the lack of drag underneath, the 87D outperformed the design engineers data by pointing higher and just going faster than Macgregor wanted. Subsequent models were designed to slow the Mac fleet down, starting with increased windage on the 88, 89, and then designing a slot in the bottom for the swing CB (Macgregor had already tried this with the swing keel and knew about the increased drag it would cause). The S models still exceeded the desired design criteria, and growing tired of incremental increases in drag, Macgregor went ahead and designed the motorized models, which are much slower and therefore assumed to be safer for public consumption. I thought I'd throw this outrageous comment out there. I recently became interested in the Mac 23 cutter rig, and I believe it could sail faster than all of the Macs on some points of sail and in certain conditions. It is worth noting that other sailboat manufacturers progress towards faster designs, while Macgregor seems to be slowing down....Flame suit on. John S Boise