>  I have a 7” x 7” heater core, and it puts out at least 1500 watts, or more. <

 

Al,

I too am in the process of installing a rotary in a canard. I have looked at putting the heater core in the ‘hell hole’ and ducting the heated are to where it’s needed. My plane is a little different in that it has two 2 inch ducts running down each side already that I can tap into.

 

What I’m wondering is do I really need a fan?

I’m thinking I could catch air via an NACA scoop and use that instead of a blower.

 

Now I know that the source is going to be cold air but when I run my heater in my truck on a 20 below day here in the wonderful state of Nebraska, the source air is from the outside and it heats up just fine.

 

I like the Idea of keeping anything electrical out of that location if it is possible while at the same time shortening up the lines to the core.

 

T Mann