Brief Description: Preparing for the Stall Warning Kit
As I reworked the Stall Warning Sensor Support Brackets I had in the back of my mind a goal to minimize the weight increase. Wasn't sure how successful I could be because there had to be some overlap of the two new parts to allow me to rivet them together and all of the overlap represented a double thickness that the original one-piece part lacked. The fore/aft displacement of the two parts (the lower bracket is about 5/16 inch forward relative to the upper bracket) allowed me to trim the aft edge of the upper bracket and I also trimmed off the forward bracket flange and the web below it on the theory that since it wasn't riveted to the skin it wasn't adding strength or stiffness to the bracket. I chopped off the top two thirds of the lower bracket after determining that I could get three 1/8" diameter flush-head rivets in the bottom third of the bracket. The images below show the results. Image 1 shows the two bracket pieces overlaid as if they were one bracket - the lower bracket will actually be behind the upper bracket in the actual installation but I wanted to show how I enlarged the switch mounting plate pivot hole and combined it with what was the pivot hole on the lower bracket. Image 2 shows that the equivalent RV-9 part weighed in at 40 ounces and Image 5 shows that my reworked brackts (minus rivets) also weighs 40 ounces. Success!
Final Upper and Lower Stall Warning Sensor Support Brackets Overlaid
Origianl RV-9 Stall Warning Sensor Support Bracket Weighs 40 Oz.
Re-Worked Stall Warning Sensor Support Brackets Also Weigh 40 Oz.
