The tape should go on the top. The tape is intended to turbulate the air flow's boundary layer. It is intended to delay stall because the turbulated flow tends to remain better attached to upper surface.
In addition to a saw tooth shape, a simple linear arrangement is also used. The linear style is called a trip strip. The saw tooth is called a vortex generator. It's my understanding that both are similar in what they are intended to do. But, one may be more effective than the other. It's my opinion that the tapes are a band-aide measure. They can be helpful but often there is a better way. Plus, using them incurs a drag penalty. I'm sorry but I'm not familiar with what you're called a Gurney flap. Bill Swingle [EMAIL PROTECTED] Janesville, CA RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
