Fletnner Ventilators

[rar]

I don't have power available where I lay up so can't use a de-humidifer and I don't fancy trays of silica gel. Alternative is therefore to dry out by keeping the inside well ventilated. Anyone any experience of using Flettner ventilators, they can move quite large quantities of air at low wind speeds and my lay up area is windy

 

[isandell]

I found a great improvement just by increasing ventilation. In my case, this was simply cutting a couple of holes in washboards, covered by louvre grills.

Ian

 

[sarabande]

Sitting below one in a van as you go along at 60 mph is an experience to be heard. They are very effective but wonder if they would cope with a wave rather than just rain.

Vehicles tend to have air coming into the interior through the heater etc, which makes the Flettner able to extract 18 cuft / min in a 10 mph wind. Unless you have another opening at the other end of the boat to allow (damp ?) wind <u>into</u> the cabin, the Flettner might not be able to extract from what is effectively a closed box.

More ventilation by other means, as has been suggested, might therefore be more effective.

 

[Poignard]

I once had a glider trailer with two of these on. Very effective but I don't know how they would stand up to a marine environment. If you only want them when laid up you could perhaps fit them in place of any other ventilators you have, or make some temporary ply hatch covers with the Flettners fitted to them.

 

[kengill]

I have a centre hatch ventilator in the forward cabin, twin dorades in the saloon and small opening hatches in the heads and the rear cabin, I also lock the forehatch in the vent position and do the same with the saloon hatch.

Gives quite sufficient ventilation through out the year.