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taking a better look at innards on the '71 27. There are two vents on the transom and two vent hoses. There is one blower-- it appears fairly new-- and only the starboard vent hose is connected to the blower which then has tubing that goes to the starboard vent; the open end of that starboard hose lies at the deepest part of the boat under the gas tank. The port side hose simply goes from the area of the motor on the port side to the port vent on the transom. Is this standard? Does that port hose serve any purpose and, if not, would it be advantageous to T-connect it to the starboard hose?
P.S. added after a bit of thought-- is the port tubing meant to draw air *in* rather than exhaust? Perhaps to stir up gas fumes that sank to the bottom on the port side and allow them to be exhausted by the starboard exhaust?
thanks
Steve
Last edited by (2006-05-29 07:01:03)
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That is the way mine was setup.
Mike M
SV Wind Horse
#375
Galveston, Tx
Mike M
SV Wind Horse
#375
Galveston, Tx
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Hi Steve,
Mine's the same -- and my assumption has always been that the port-side vent provides "inflow" and the starboard-side "outflow" and to that end, I have the port vent hood forward-facing and the stb. vent hood facing aft so when the boat is moving there's an air flow through the bilge even without running the blower.
Clare Jordan
<U>SAIL FOR SALE </U>_
#2 Genoa for 27' Mk.111 by North Sails . Tri-radial cut, Norlam fabric, built 1998-- good shape . Window, tell-tales and draught stripe. Stitching etc. checked ;2001/2002 . #6 Luff tape .
Replacement Genoa is on order for 2004 racing season but there's some cruising years left in this one -$ 550 asking price. phone 613 498-2029 or e-mail <A href="mailto:bosco@ripnet.com">bosco@ripnet.com</A> <img src="emoticons/icon_frown.gif">Brockville)
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thanks, Mike and Clare.
Steve
I installed a solar powered fan in the port vent that runs 24/7. It's silent and draws about 40 cubic feet per min. I didn't like a hot smelly cabin when getting to the boat, now it's always cool and clean smelling.
Michael S.
Thanks for the idea, Michael, I'd actually thought of putting a fan or two just inside the cabin to blow into the motor compartment-- with lazarettes open. My concerns were about messing up the factory designed airflow in the sub-cockpit compartment and about sparking.
Two questions: Where did you install the fan: in line in the hose or at the hood on the transom? I am assuming from the way you wrote your message that it functions as an exhaust-- is that correct? Also, did you use a specially "spark-safe" fan (if there is such a thing)?
thanks
Steve
Steve,
Yes, it's an exhaust fan. I screwed it onto the plywood at the base of the vent, there is no hose. It' a brushless .20 amp computer fan, so no sparks.
The fan is connected to a 7amp gell cell that is charged from a 10 watt solar panel through a voltage regulator. Even after a week of grey weather the fan still runs, but not at full speed.
Our MkIII has the factory vent located in the head. The fan draws air through the entire boat from this point. I put a feather in front of one of the holes in the galley cabinets and you could see the draw. I think it also pulls from the bilge as there are none of the usuall smells.
Michael
Michael
Sounds great. If you know the brand(s), etc. of the components that's be excellent to know. You say there's no hose-- isn't one of the vent hoses from the motor compartment attached to the underside of the plywood to which you attached the fan?
Steve
Steve,
If you go to an electronics shop, the type that sells serious stuff for the guys that like to build their own radio's and such, you will find a wide variety of the parts I mentioned. Best thing is that they're not expensive, fan less than 20 bucks and the battery about 22, solar panel was a little pricey though.
There was no hose when I stared this, and I really don't see the point in having it there as the entire engine compartment and bilge are always being mechanically vented. I do have an electronic sniffer just in case though, as well as a blower.
When we bought the boat I noticed that even though she was very well maintained there was always a slight fuel odor after a few days of sitting or even while at anchor depending on the wind. Since this installation I have never smelled fuel. Even after sitting for a week you can go down and open up an aft hatch and there are no smells.
Heading out now for a few days, hope to be having fresh crab with my steak tonight.
Michael
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