Kit Aircraft Modifications

I have been asked to make up some fan grills for other builders like the ones I posted a week or so ago. They can be customized to your specific aircraft type or I can put your aircraft identification number in the design as well. They are 4.5″ x 4.5″ and have a bolt pattern that is 3.5″ x 3.5″(this can be varied depending on your specific fan size).

Contact me if you are interested in having thes made for you. Approximate cost for 2 grills made from 20 guage 304 stainless is US$ 50.00

I ship them flat which means that you have to bend out the louvers. They will have a mill finish as most builders will want to powder coat or paint them to their specific color of choice.

Here is a picture of the one in my plane.

Dave

With a liquid cooled engine now in the works I had to start thinking about how to modify the cabin heating system. The RV-10 has installed tee shaped ducting in the center tunnel that is connected to the heat muffs on the exhaust pipes in the original configuration. I wanted to maintain the same outlets so I had to fashion a heat exchanger and plenum that would allow me to connect 2″ SCAT tubing towards the forward endo of the tunnel as well as aft.

I found a MOCAL heat exchanger that along with banjo fittings would fit into the tunnel while laying on its side. From there I made up a stand that Would allow me to anchor it to the floor as well as have it at the proper height for the SCAT tube runs. They run quite high in the tunnel.

I had to make the whole thing removable as it is the last piece of the puzzle to be placed inside the tunnel and I need to be able to get at everything else in there during annual inspections and for maintenance.

The heat exchanger is connected to 90 deg. bulkhead fittings on the firewall (3/4″) with braided teflon hoses and I have insulated the lines as best as I can to keep the heat down in the tunnel. I am going to be making a bypass valve on the firewall side that will allow me to vary the amount of fluid that is going through the exchanger.

On top of the heat exchanger is a 4″ SPAL fan that I have pulling air through the fan into the plenum. This fan is of high quality and it seems to move the air quite well through to the two distribution tees in the front and back footwells.

I haven’t decided whether I am going to vary the speed of the fan with a thremostat or whether it will simply turn on and off. I still have some thinking to do on that.

Dave