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I made a very utilitarian shut off for my NACA Duct by buying a  4" sliding
vane shut off from Builder;s Square  or Lowe's or Home Depot.

This was being sold in the department that sells sawdust vacuums and tubing,
fittings, etc. for ducting your sawdust into a vacuum.

It is made of injected molded black plastic, and weighs 6 or 8 oz.

I put it inline with the 4" SCAT tubing coming from the tail, and I fashioned
a cable fixture out of aluminum so that I can access it by pulling a cable
handle--which I mounted between the stowed wheels in the belly.

In the late fall, I pull the handle to close off the duct, and in the spring,
I open the duct.   Works swell.

You can buy 12 volt motorized units from mobil home parts centers, but they
weigh a couple of pounds.

The push-pull cable is light and works fine.

David Jones
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Please send your photos and drawings to marvkaye@olsusa.com.
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