Crawling Inside

A recent bit of work on my Sinus required that I crawl back into the fuselage to mount the trim linkage. This will be operated by a trim control knob located between the seats, with cables going back to the linkage, which will be connected to the elevator pushrod with springs.

I had to crawl a number of times into the space shown below to do this work. Though on pillows, this was irksome, troublesome, and even a bit painful at times.

The second photo below shows the mechanism I installed. Drilling the mounting hole at the front (near) end wasn't bad, but the rear one was!

 

 

In the above photo, a static tube is on the left. This will connect a probe mounted on the vertical fin with a variometer on the instrument panel. This will provide rapid information about vertical speed, which is essential to soaring flight because you're looking for lift (rising air). You need to know when you're in that lift--right then, not several seconds later.

Next toward the center is one of the rudder cables, with a similar cable on the other side. These divide here, to be operated by both sets of rudder pedals. When I swaged these fittings, I hoped I'd never have to crawl in here again! But no such luck.

The metal piece mounted to the two bulkheads is the trim linkage. The lever in the middle of it will be operated by cables from the cockpit knob. The bottom will be attached through springs to the elevator pushrod, seen underneath the trim linkage and extending rearward.