The conversion from Portsmouth to PHRF is as follows; Portsmouth = PHRF/6 + 55 PHRF = (Portsmouth - 55) X 6 Monty 15 = 108.1 Portsmouth = 318.6 PHRF Monty 17 = 104.3 Portsmouth = 295.8 Potter 15 = 138.1 Portsmouth = 498.6 Potter 17 = 105.0 Portsmouth = 300.0 This conversion should only be used when lacking any other information. Ken Abrahams, Monty 15, Petite Fleur, Lake Charles, La. ----- Original Message ----- From: "Ludlow, Don" <LudlowD@BEK.com> To: <montgomery_boats@mailman.xmission.com> Sent: Monday, September 22, 2003 5:32 AM Subject: M_Boats: RE: M-15 PHRF Number montgomery_boats Digest, Vol 7, Issue 27
Hi all: I've searched the archives and haven't found a PHRF number for the M-15. I did find some formulas though. The archives list the PHRF number for the M-17 as 295. Since the M-15 hull has about the same lines (scaled down), I thought I could work out a ratio. The rating velocity is given as 3600 / (PHRF + 500) which works out at 4.26 knots for the M-17. The theoretical M-17 hull speed is 1.34 x Sq rt of the LWL (15.8') or 5.33 knots. Thus the PHRF rating speed is 4.26/5.33 or 80% of the hull speed. Applying this to the M-15, I get a hull speed of 4.87S knot based on a LWL of 13.25'. 80% of this gives a PHRF rating speed of 3.90 knots. Backing into the formula above, this gives a PHRF number for the M-15 of 373. Any comments? Don Ludlow M-15 # 620 Sweet Dream Ludlowd@bek.com
-----Original Message----- From: montgomery_boats-request@mailman.xmission.com [mailto:montgomery_boats-request@mailman.xmission.com] Sent: Saturday, September 20, 2003 11:55 AM To: montgomery_boats@mailman.xmission.com Subject: montgomery_boats Digest, Vol 7, Issue 27
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Today's Topics:
1. vague memory . . . (Honshells) 2. M23 (Honshells) 3. RE: vague memory . . . (htmills@bright.net) 4. vague memory . . . (Honshells) 5. Re: M_Boats:Plastic lumber for bunks (Steve & Diana Parsons) 6. Re: M_Boats:Plastic lumber for bunks (Richard Lane) 7. Isabel and the Montgomeryites (htmills@bright.net) 8. RE: Isabel and the Montgomeryites (htmills@bright.net) 9. Re: Isabel and the Montgomeryites (TOMMYVAL@aol.com) 10. Solomon's Photos (htmills@bright.net) 11. Re: RE: Balsa-core deck (Jerry Montgomery)
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Message: 1 Date: Thu, 18 Sep 2003 22:30:47 -0400 From: "Honshells" <chonshell@ia4u.net> Subject: M_Boats: vague memory . . . To: "For and about Montgomery Sailboats" <montgomery_boats@mailman.xmission.com> Message-ID: <006001c37e56$09912420$0e42b3cf@ajrogers>
I have vague memories of two "links" emails I archived for later, one for an M23 and one for an M15 for sale . . . Two separate postings . . . I can't find them . . . Does anyone have them?
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Message: 2 Date: Thu, 18 Sep 2003 22:32:40 -0400 From: "Honshells" <chonshell@ia4u.net> Subject: M_Boats: M23 To: "For and about Montgomery Sailboats" <montgomery_boats@mailman.xmission.com> Message-ID: <007001c37e56$4cf94e40$0e42b3cf@ajrogers> Content-Type: text/plain; charset="iso-8859-1"
Fred, I'm assuming you're talking about the new M23 Offshore Cutter. I think I speak for everyone when I say, "I'd very much like to see more of and hear more about your boat!!!" I'm also assuming that you've purchased the first Offshore Cutter built. Please post pics when you have them, and let us know how your 23' performs. Thanks! --Craig, chonshell@ia4u.net
----- Original Message ----- From: Derfsails@aol.com To: montgomery_boats@mailman.xmission.com Sent: Saturday, September 06, 2003 3:35 PM Subject: montgomery_boats Digest, Vol 7, Issue 3
Hi Mark,
You may want to talk with Bob Eeg, as the 23 I have purchased from him does have a bronze center board. We are scheduled to put the mast up and check the center board this coming Monday then put it in the water on Tuesday.
Fred Shelley derfsails@aol.com