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Old 04-15-2015
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More Ventilation in Aft Cabin --Center Cockpit with Dodger

Hatch scoops don't make sense; the dodger blocks the wind. Certainly you can open everything up, but the back end still cooks. Pulling/pushing air through from the forward cabins doesn't really work, since it is pre-heated during its passage through the boat. Better that warm air goes up the companionway.

I've seen wind scoops for the side hatches, but they seem awkward and small.
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Old 04-15-2015
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Re: More Ventilation in Aft Cabin --Center Cockpit with Dodger

A length of 'slinky' type dryer ducting/hose strung up along the lifelines facing the wind? Could add a larger 'funnel' style collector to it too... The hose itself would store quite compactly.
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Old 04-15-2015
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I feel like I'm pushing stuff today, but these posts are all related. Solar vents seem like the perfect solution here. I swear I have no interest in them. I've recently purchased and am installing two but in home testing, they move a lot of air. Combined with some method of passive air egress or ingress it should solve your problem.
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Old 04-16-2015
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Re: More Ventilation in Aft Cabin --Center Cockpit with Dodger

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Originally Posted by seaner97 View Post
I feel like I'm pushing stuff today, but these posts are all related. Solar vents seem like the perfect solution here. I swear I have no interest in them. I've recently purchased and am installing two but in home testing, they move a lot of air. Combined with some method of passive air egress or ingress it should solve your problem.

Solar vents are even enough to count for anything in the summer. Honest. I have them in each cabin (twin aft cabins) and you can't tell if they are on or off. Just for humidity control, in my opinion.
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Old 04-16-2015
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Re: More Ventilation in Aft Cabin --Center Cockpit with Dodger

We have the same problem and I am convinced that air egress is the answer. Many aft cabin boats have ports in the transom, which is ideal, but we have a large lazarette aft of the cabin, so we need another option. We can move plenty of air in, but with no way out, it can't create a flow, and the aft 4 feet of our cabin can get pretty warm.
There used to be a venturi funnel available that would move a tremendous amount of air without letting water in, but I can't find them anywhere and my post on the construction of one bombed out.
I don't know what's aft of your cabins, but if you can get the air to egress, you'll have no problem getting the air to pass through and cool the cabins. Properly designed, you might even be able to draw air in without the help of wind scoops or the like. We do get some relief using the O-2 Cool 10" 12 volt fans, but again with an egress, those would also work better.
Good luck.
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Re: More Ventilation in Aft Cabin --Center Cockpit with Dodger

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We have the same problem and I am convinced that air egress is the answer. Many aft cabin boats have ports in the transom, which is ideal, but we have a large lazarette aft of the cabin, so we need another option. We can move plenty of air in, but with no way out, it can't create a flow, and the aft 4 feet of our cabin can get pretty warm.
There used to be a venturi funnel available that would move a tremendous amount of air without letting water in, but I can't find them anywhere and my post on the construction of one bombed out.
I don't know what's aft of your cabins, but if you can get the air to egress, you'll have no problem getting the air to pass through and cool the cabins. Properly designed, you might even be able to draw air in without the help of wind scoops or the like. We do get some relief using the O-2 Cool 10" 12 volt fans, but again with an egress, those would also work better.
Good luck.
I think you are on the right track. We have 2 small hatches that open onto the aft deck and a fair amount of air is sucked out. A small aft-facing funnel that would also block rain might be an answer. Gotta think on that.
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And your vents are on exhaust? I found in my box tests that they did little unless there was ample air entry and they were in exhaust mode. Then they created a pretty decent wind tunnel. But I will bow to experience if you've already tried.
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Re: More Ventilation in Aft Cabin --Center Cockpit with Dodger

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And your vents are on exhaust? I found in my box tests that they did little unless there was ample air entry and they were in exhaust mode. Then they created a pretty decent wind tunnel. But I will bow to experience if you've already tried.
Yes, on vent.

I'm not sayin' they don't serve a function, just that in my siuation they are far too little when the thermometer hits 95F.
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Well, if you have enough ways for air to get in, then I bow to your experience.
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Old 04-16-2015
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Re: More Ventilation in Aft Cabin --Center Cockpit with Dodger

Quote:
I'm not sayin' they don't serve a function, just that in my siuation they are far too little when the thermometer hits 95F.
That would be my assumption, too. If your boat is hotter than the temp outside, then any ventilation will improve that, including solar fans. However, once things are in equilibrium, then what you really need is moving air to improve evaporation from the skin. Maybe if the solar fan was scaled up? Bigger panel, bigger battery, much more powerful fan. If any of you have whole-house fans, you know what I am thinking of.
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