IMHO through hull fittings, above or below the waterline, are not where you want to implement a unique design, and therefore unproven design.
Any output hose heading overboard should be routed up through an anti-siphon loop with a vacuum breaker and then back down to a through hull fitting. Check the lift distance specs on any centrifugal pump, as they are somewhat limited. http://www.forespar.com/onlineCatalog/2007/Marelon/09marelon_ventedLoops2007 .shtml The bilge tubing distance that counts, in the reference below, is the distance to the vented loop. Anything beyond the loop would drain outside. Of course there is a question on the type of bilge pump being used also. I'd recommend anyone needing a bilge pump call the factory and buy what they spec on the C270 but what I have (Catalina supplied) looks a lot like this. http://www.starmarinedepot.com/Jabsco+36600+Diaphragm+Bilge+Pump.html A diaphragm type pump gets mounted outside the bilge and only a hose and a switch need to be in the bilge. It by its nature has one-way check valve (actually a pair) that prevent back flow. Our output fitting is only 10" above the waterline but is routed via a vented loop high in the transom first. They also need a strainer on their input to insure debris does not jam a valve open. Phil Agur s/v Wing Tip Secretary/Treasurer 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: Thursday, July 05, 2007 9:24 AM To: [email protected] Subject: RE: catalina27-talk: Bilge water Anyone have a bilge discharge high on the side of the hull? I know some people sail their boats on the side, but its not often that most of us bury a rail, and a side discharge would reduce the bilge tubing distance, and the dead <smelly> water that lies in it. Jim , Tequila Chica, Dana Point, CA "Terrence McCarthy" <[EMAIL PROTECTED]> Sent by: [email protected] 07/03/2007 10:54 PM Please respond to [email protected] To [email protected] cc Subject RE: catalina27-talk: Bilge water All, I have a 76 dinette version and I have an electric bilge in 'er. On a bachelor party trip with my brothers over to Catalina Island last May, the wind died and I had to turn on the engine and power forward at approx. 4 or 5 kts. After about 30 minutes or so, one of my brothers went below and freaked when he saw a few inches of water in the cabin below. I naturally freaked myself and told him where the manual switch was for the bilge and had him flip it on. Water started pumping out (I assume) but then it kept filling once the switch was let off. Turns out, with the forward push of the engine power and the approx. 100 lb. cooler we had loaded on the rear lazarette, the drain hole we had in the rear lazarette was submerged and therefore creating a siphon for the bilge discharge. After moving the cooler, things leveled out but I decided to redo the piping of the bilge discharge and drilled a new discharge hole well above the water line in the rear lazarette and attached a new outlet piece. I then attached the bilge discharge line to this outlet rather than having it dump into another compartment in order to drain out. I think it is the best way to go for anyone with this setup to avoid any possible back siphon into the bilge. I've had no problems since. Also, maybe I shouldn't have put that 100 lb. cooler in the back of the boat, but we're sailing here right?? :0) Terrence C27 - Bombero King Harbor, CA >From: "Paul Tschirhart" <[EMAIL PROTECTED]> >Reply-To: [email protected] >To: <[email protected]> >Subject: RE: catalina27-talk: Bilge water >Date: Thu, 31 May 2007 11:53:25 -0400 > >Pat, > >I have an outboard so can not speak to the packing gland but my 76 has >had very little water in the bilge since I reseated all of my windows. A >driving rain will leave a cup or two and I assume that comes from the >companion way. > >Paul >C27-someday >Lake Erie >Ontario > >-----Original Message----- >From: [email protected] >[mailto:[EMAIL PROTECTED] On Behalf Of Patrick R Ford >Sent: Thursday, May 31, 2007 12:47 PM >To: IC27A >Subject: catalina27-talk: Bilge water > >This is my 5th season with my 1978 C27. I do not have an electric bilge >pump. I have the original manual pump in the side of the Port lazarette. >For 28 years the PO and myself , each time we go aboard, would give the >pump 3 or 4 pumps and empty the bilge. Most time NO water. This year, >since launch 5 weeks ago, I have to pump it 10 plus times ?? We have had >rainy days but ? >My question-- how does water enter the bilge? Packing box or ? >Pat Ford >Seabiscuit 3692 >Port Washington, WI > > _________________________________________________________________ Don't get caught with egg on your face. Play Chicktionary! http://club.live.com/chicktionary.aspx?icid=chick_hotmailtextlink2
