How trim works in Vega

General information about Wing42's Lockheed Vega.
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Jarek
Posts: 104
Joined: 18 Jun 2018, 21:31

How trim works in Vega

Post by Jarek » 28 Aug 2018, 17:51

This is quite interesting mechanism, so I decided to describe it in details in the separate thread.
Ok, so first picture shows something that I didn't pay attention to. Please notice 10 vertical metal bars
attached to fuselage, they mark horizontal stabilizer movement area. It moves together with fairings that attached to it.
There is a little space between fuselage and this fairing. Rotation axis is located near the elevator hinges.
trim_marks.jpg
trim_marks.jpg (82.95 KiB) Viewed 192 times
So let's remove these fairings and look what's inside (thanks to Caroline):
caroline.jpg
caroline.jpg (45.33 KiB) Viewed 192 times
All pictures by famous John Oder. His webpage www.aeromuseumservices.com is not available anymore, so I decided to post these pictures here to save this information for others.

Jarek
Posts: 104
Joined: 18 Jun 2018, 21:31

Re: How trim works in Vega

Post by Jarek » 28 Aug 2018, 17:54

Elevator in neutral position:
trim1.jpg
trim1.jpg (28.49 KiB) Viewed 191 times
Elevator in Full Nose UP position:
trim2.jpg
trim2.jpg (45.2 KiB) Viewed 191 times

Jarek
Posts: 104
Joined: 18 Jun 2018, 21:31

Re: How trim works in Vega

Post by Jarek » 28 Aug 2018, 17:56

Rack and pinion type gear which moves front section of stabilizer up and down:
trim3.jpg
trim3.jpg (173.3 KiB) Viewed 191 times
Gearbox in the rear section of fuselage with control rod:
trim4.jpg
trim4.jpg (170 KiB) Viewed 191 times

Jarek
Posts: 104
Joined: 18 Jun 2018, 21:31

Re: How trim works in Vega

Post by Jarek » 28 Aug 2018, 17:59

Gear box with the crank located in the cockpit (Lockheed Orion). Attached by 4 crown nuts, secured with cotters.
trim13.png
trim13.png (195.18 KiB) Viewed 191 times
This mechanism used in Vega is now called Trimmable Horizontal Stabilizer (THS) and was used on many modern airliner's designs, including Boeing 777 and Embraer ERJ.

Video showing it's operation in Boeing is available here:
phpBB [media]

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Vitus
Posts: 241
Joined: 17 Jul 2017, 15:19
Location: Görlitz, Germany
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Re: How trim works in Vega

Post by Vitus » 29 Aug 2018, 07:39

That's a great find! I didn't see those close-up pictures of the elevator trim before. But I am glad I got this part right in the add-on ;)

I guess the only inaccuracy is the missing torque-shaft. Dang.... I really liked the animated cables in the current version :mrgreen:
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