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Yes, very interesting!
I wish I had (re)read Ed's article before I made my RV-4 radiator ducts. Specifically the point about pinching down the duct near entrance to improve airflow attachment in a short duct.
I have now resigned to using steering vanes. Even so, I'm still seeing highest pressure in the center of the radiator. I only have five pressure sensors, one in each corner (1" from corner) and one in the center. Adding the # vanes to the right rad dropped its coolant return temp 5 to 10 degrees relative to the left rad's. Next step is to add vanes to the left rad.
Pressure sensors are expensive. I may change approach to instead put nine temp sensors behind the rad to measure even air distribution.
Finn
On 1/11/2024 11:24 AM, Le Roux Breytenbach breytenbachleroux@gmail.com wrote:
Interesting old articles
https://issuu.com/contact.magazine/docs/contact_magazine_issue_87_rotary_is
Sent from my iPhone
Le Roux Breytenbach
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