Today I continued work on the horizontal stabilizer rear spar doubler (HS-3101). In the picture below I have the HS-3101 doubler laid in place on the rear spar. Other things to note in the picture are the plexi-glass templates I used for making the additional Rocket doublers and in the background is part of the Stewart S-51 rudder.
The image below is showing where the HS-3101 doubler ends, just inboard of the horizontal stabilizer center rib (HS-708). The black dashed line indicates the end of the rib and just right of the dashed line is a semi-circle mark which indicates the end of the HS-609PP rear spar reinforcing bars.
The image below shows the HS-3201 doubler that will be part of the forward spar assembly. What is shown here is the layout markings for the areas that are required to be trimmed. The outer ends of this doubler will be like a two-pronged fork, and in the center a channel will be cut for weight reduction. The center channel is marked with a series of circles. These circles are where I will drill with a large bit, and then trim away the connecting tabs.
The image below is viewed closer showing the marking layout details.
Doubler Plexi Templates
The image below shows the plexiglass template for the rear spar doubler – HS-3101. I drilled several holes in the template to help keep alignment with clecos. I also identified where the lightening holes need to be cut, which is identified by the blue marks.
The image below shows the outer end of the HS-3202 doubler. Again the blue marks on the left side of the image are showing the area in the middle of the doubler to be removed for weight reduction. The blue line on the right side indicates where to cut the doubler to length.
This image shows half of the rear spar Rocket doubler plexi-glass template. Using the plexi was a great way to figure out the layout for the doubler. I was only provided a drawing of where the doubler was mounted but no actual dimensions. By counting rivet holes in various pictures I was able to reverse engineer the HS-3101 and HS-3201 doublers.
Final Layout HS-3201 Doubler
The following images show the layout details of the HS-3201 doubler and its size a bit more clearly.
Please comment, I love hearing from my readers. Thanks again for coming along for this ride, you make my work worthwhile.