NACA Ducts

[Bill D]

I am opening up the two small NACA ducts on the fenders. How are they hooked up to direct fresh air the cockpit?

Thanks
Bill D

 

[Ron McCall]

Here's a picture of how Safir does it.

 

[Ron McCall]

Another one for you .

 

[Bill D]

Thanks Ron. I guess I'll have the body man glass in an outlet to run a 3" hose to the cockppit

 

[Neal]

I cut 2 1/2 inch holes in the fender wells and made a fiberglas duct box that runs from the duct opening to the leading edge of the well. Post this picture I placed mesh over this opening to keep the critters out. There are flapper vents inside to regulate air flow into the cabin. Works like a charm.

 

[Bill D]

Thanks Neal. Where did you get the flapper vents?

Cheers
Bill D

 

[Lynn Larsen]

Bill,

You can fab a flapper door from sheet metal pretty easily and use foam as a seal. To open and close it, you can use a vacuum motor and a vacuum solenoid to control it. They are availabe from VintageAir's catalog. Click 32.......Replacement System Parts. Here is a pic of the parts:

 

[Neal]

You can use a Y-valve to either block the inlet or redirect air between the vent and the defrost. Here is one source...

Welcome To Nostalgic Air Parts

 

[Chris Duncan]

run a 3" hose to the cockppit

calc the volume of your opening Bill, you should be able to get by with a 2 or 2-1/2 hose. You may loose velocity with 3", not to mention space savings.