Hi Earl,
The Catalina website's high level bullet reads, "January 1982 Patrick Childress completes a 2 1/2 year, single-handed circumnavigation in his Catalina 27." It was a mid seventies shoal draft outboard model with forty structural upgrades performed by the owner. The modifications are listed in The Seaworthy Off-Shore Sail Boat back in an appendix. I need to refresh some details before going much deeper into it. The radio call sign is for international travel using VHF. One of the remote panel Single Side Bands would fit but then do you do that before radar and if you do both do you need an arch. Instead I kept thing in the proper scope of a coastal cruiser. I did help my brother do exactly that on his IP38 but he had the arch and radar already. We did add a duplicate of my chart plotter at his wheel. Having a chart plotter down at the nav station is cool for planning but in the middle of the night off Baja you want a real time display of you and the off shore obstructions. When we came up from Cabo San Lucas in 2005 I found I could smooth out the bumps during the night by steering around the sea mounts even though they were plenty deep. Wing Tip's Standard Horizon DSC VHF is interfaced directly to her SH GPS chart plotter which is at the wheel. The CP is also interfaced to her auto helm. Since I stayed with a true marine supplier the VHF not only sends DSC distress call but receives and plots them on the GPS. If I hit "go to" the auto helm will take me there and the CP will display an ETA once I settle on the course. Should that course run me over a charted obstruction the CP's read ahead alarm will sound. That's way ahead of a depth alarm in my book. I just wish the CG had the same gear on every asset in their inventory. Rescue 2000 was bigger but my low budget solution has been installed and working since '97. My DSC VHF even acts as a repeater so if I get your distress call from 25 miles away I'll pass it on another 25 miles and if we all had that the CG wouldn't need to go bigger. Sorry Earl, no it's just VHF. Phil Agur <http://www.catalina27.org/public_pages/profile270.htm> s/v Wing Tip Secretary, Call Sign WCW3485 IC27/270A MMSI 366901790 www.catalina27.org Vessel Doc# 1039809 -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of el sailor Sent: Tuesday, August 12, 2008 12:52 PM To: [email protected] Subject: Re: catalina27-talk: Hull speed Recall reading about at least one circumnavigation by a gent in a C27 -- does anyone know the year of that particular model? Also, Phil, your signature contains a call sign. Do you have SSB aboard Wing Tip? Earl Burgess #3188 s/v Nautidog ----- Original Message ---- From: Phil A <[EMAIL PROTECTED]> To: [email protected] Sent: Tuesday, August 12, 2008 12:11:19 PM Subject: RE: catalina27-talk: Hull speed Art, The various models all went through the same generational changes as Catalina Yachts matured. There is a generational weight factor as construction got more solid, but there is also some issues in how Catalina specifies displacement. I expect the actual displacement to be 12 - 15% above the data sheet. Serious racers often go through a period of trading hulls seeking out a light one and then beef it up with technology. Serious cruisers buy the newer heavier constructed models. Phil Agur <http://www.catalina27.org/public_pages/profile270.htm> s/v Wing Tip Secretary, Call Sign WCW3485 IC27/270A MMSI 366901790 <http://www.catalina27.org> www.catalina27.org Vessel Doc# 1039809 -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Phil A Sent: Tuesday, August 12, 20088:49 AM To: [email protected] Subject: RE: catalina27-talk: Hull speed Art, The whole point was to supply the weight sensitive hull speed formula not to supply another arbitrary number. Of course no one should be using an assumed factory weight but get a real weight. BTW 6850 yields 6.52 knots. Phil Agur <http://www.catalina27.org/public_pages/profile270.htm> s/v Wing Tip Secretary, Call Sign WCW3485 IC27/270A MMSI 366901790 <http://www.catalina27.org> www.catalina27.org Vessel Doc# 1039809 -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of HERRICK Sent: Tuesday, August 12, 20086:36 AM To: [email protected] Subject: Re: catalina27-talk: Hull speed What kind of boat do you have that weighs only 5700 lb? My '84 displaces 6850 lb, w/ M-18 Diesel. I heard that the disp. grew over the years, but 1150 lb. is a big jump! Art Herrick #5468 Sea Change ----- Original Message ----- From:Phil A <mailto:[EMAIL PROTECTED]> To:[email protected] Sent:Monday, August 11, 20083:53 PM Subject: RE: catalina27-talk: Hull speed That's consistent with my wife's record of 8.4 knots on Wing Tip. Broad reach in 25 -30 knots with no sea. Of course that's nothing compared to my 85 when the CHP just shook his head. Instead of using 1.34 a C27 uses a factor more like 1.5 resulting in a 6.92 knot hull speed. Disp. = 5700 Lbs. LWL= 21.75 Ft. Dave Gerr - The Nature of Boats D/L = 247 Eq #1: D/L=(weight/2240)/(0.01 * LWL)^3 S/L = 1.49 Eq#2: S/L = 8.26/(D/L)^0.311 Adv. Hull Speed= 6.94 Knots Eq#3: Hullspeed = S/L * LWL^0.5 Traditional HS= 6.25 Knots Assumes S/L= 1.34 And of course TF may have been dogging it since square root of 34.5 (LWL) x 1.5 = 8.81 kn. If the J Boat hull was higher tech than a typical Catalina then reduced weight could force it higher. I know I may be stretching my credibility here but I didn't write the book. Remember Pyewacket didn't shatter Merlin's 12 year Tran Pac record until they had a computerized Polar performance program nagging the crew when they were slow. And then they shaved off a full day. A full day! Just knowing you're slow is a major part of the battle to win. Never settle for traditional hull speed again unless you're sailing a traditional construction boat. Phil Agur <http://www.catalina27.org/public_pages/profile270.htm> s/v Wing Tip Secretary, Call Sign WCW3485 IC27/270A MMSI 366901790 <http://www.catalina27.org> www.catalina27.org Vessel Doc# 1039809 -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Sunday, August 10, 2008 6:10 PM To: [email protected] Subject: RE: catalina27-talk: Hull speed or slightly above hull speed... was on a J122 today and (just very slightly cracked off) saw 8.4 knots, upwind in a 15 kn breeze. hull speed plus tf pix and it happened square root of 34.5 (LWL) x 1.34 = 7.88 kn > > Weight maters but I'll have to hunt for the advanced hull speed formula. > > Phil Agur s/v Wing Tip > Secretary, Call Sign WCW3485 > IC27/270A MMSI 366901790 > www.catalina27.org Vessel Doc# 1039809
