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Thursday, July 5, 2018

Transition from trim actuator tube to the trim tab push rod

This is pretty straight forward but I was not able to find any examples on the Bearhawk builders forum or in the plans.  At the bottom of both horizontal stabilizers the trim tab push rod connects to the actuator tube that runs through the ribs of the H Stab.  I wanted to make a hole big enough for access for maintenance/inspection.  I was hoping for a cover with a slit that the tab on the actuator tube could poke through.  But the nut and bolt sit right on the fabric line so the hole is larger than I intended.  I suppose I could have extended the tab to avoid the conflict with the nut and bolt, but I can do that after the bird is flying.  The last pictures show what I am talking about.

Where the push rod and actuator tube connect is where opening will be



.032 Aluminum for the backer plate

Backer plate ready to be installed

Bedding backer plates in position

Openings cut.  Actuator tube and arm exposed

Doily to encapsulate the backer plate

Backer plates with nut plates to secure the final aluminum cover


Cover with an opening just big enough for the attachment knuckle to clear the fabric line.  Overall, the opening and cover do not need to be as large as this.  If I were to do it over, this would be about 1/3 smaller.

Push rod connected to the trim tab.  Fabricated the cover from the same .032 aluminum.  Did the same for the other side.  

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