Steve -- Very interesting and thanks. And I agree with you regarding the flush deck model. Anyone out there have an understanding of design that can shed some light? I'm fairly sure both 17' models would have the same hull so it's difficult to understand how only aerodynamics could have such an impact. Ashley T. M15 - # 478 Morgan Hill, CA ----- Original Message ---- From: Steve R. <stever707@mail.saabnet.com> To: montgomery_boats@mailman.xmission.com Sent: Thursday, October 12, 2006 5:56:38 PM Subject: M_Boats: Portsmith Yardstick Numbers I stumbled on this list of Portsmith numbers at: http://www.ussailing.com/Portsmouth/ The information is presented by category (centerboard, fixed keel) in web format (HTML) and for all boats in CSV and text formats. I took a CSV file and sorted it in excel to group all the Montgomery models together. The rating is D-PN not PHRF. Here are the basic numbers for Montgomery boats: MON8 134 7-11 MON10 133 10 MON12 110 12 MON15 108.2 15 MON17 104 17 MON172 95.8 17 Fl.Deck MON17H 100.7 17 TM MON23 94.8 23 There are additional numbers by wind speed for the 15 and on up, but I am not certain the columns will come out so I will try to post only the basic information. I guess the 17H is the fixed keel version. I am amazed at how low the flush deck 17 is rated. steve Steve R. M-15 #119 Lexington, KY _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats