In the latest issue of Kitplanes ( 12-2015) there is a good article by David G. Ullman titled " Using Vortex Generators to Enhance Pusher Aircraft".
He was working on engine cooling for his Velocity using NACA vents.
Back in about 1981 or so, I needed more cockpit air and installed NACA vents on the side below the front of the windshield on my Falconar F-12. Worked great, had an abundance of air. When building my little Single Seat Super Cub, (SSSC), I decided to put NACA vents to feed the oil cooler. Had a vent on each side of the cowl behind the nose bowl. Used two 1 1/2" dia scat tubing to the oil cooler box. Got very little airflow. So I moved the air pickup to the rear of the Cub type cylinder heat air scoops. Went to 2- 2" scat tubes. Worked almost to good. Oil temps are almost to cool. Now, if the OAT is 70 or below, I disconnect one of the scat tubes to keep the oil temp up. Another unexpected change was the CHT went down 10 degs.
I wonder what the outcome would have been if I had tried using Vortex Generators like Mr. Ullman did on his Velocity.
Dan
He was working on engine cooling for his Velocity using NACA vents.
Back in about 1981 or so, I needed more cockpit air and installed NACA vents on the side below the front of the windshield on my Falconar F-12. Worked great, had an abundance of air. When building my little Single Seat Super Cub, (SSSC), I decided to put NACA vents to feed the oil cooler. Had a vent on each side of the cowl behind the nose bowl. Used two 1 1/2" dia scat tubing to the oil cooler box. Got very little airflow. So I moved the air pickup to the rear of the Cub type cylinder heat air scoops. Went to 2- 2" scat tubes. Worked almost to good. Oil temps are almost to cool. Now, if the OAT is 70 or below, I disconnect one of the scat tubes to keep the oil temp up. Another unexpected change was the CHT went down 10 degs.
I wonder what the outcome would have been if I had tried using Vortex Generators like Mr. Ullman did on his Velocity.
Dan
