Sign in to follow this  
VeryBumpy

Classic airliner mechanical question

Recommended Posts

Say a Constellation or DC-6. The pilots moved all the controls (throttle, yoke, cowl, rudder, etc). How?

 

I mean were they simply moving hydraulic control valves then oil psi moved all the actual plane parts with rams? Where there actual cables used?

 

I tried Google searching but come up pretty empty for any good pictures that show how old airliners worked or put together for flight control systems?

Share this post


Link to post
Share on other sites
Help AVSIM continue to serve you!
Please donate today!

Here is a link to a PDF I found about the flight controls for the Electra. 27 pages of it with lots of diagrams and pictures of the flight controls.

 

Lots of cables and hydraulic booster pumps used in the Electra.

 

http://www.spruemaster.com/blog/wp-content/gallery/manual/Lockheed%20L-188%20Electra%20-%20%20Electra%20Flight%20Control%20S%20ystem%20Part%202.pdf

 

Take the time to download it as it really explains the workings of the Electra rather well.

 

If you want to know how an aircraft works it is always worth a search for the aircraft name + "illustrated parts". If you are lucky someone will have uploaded a PDF of the Illustrated parts catalog for the aircraft which really goes into the nuts and bolts of all the parts that put a particular aircraft together.

  • Upvote 1

Share this post


Link to post
Share on other sites

Yes lots of the old planes would have super long cables to connect controls. Even now a days, general aviation planes have cables.

Share this post


Link to post
Share on other sites

I trained as a Flight Engineer on the P-3 many years ago and the P-3 was based on the Electra. Control movement  operated cables that then moved selector (control) valves which operated boost packs containing the actuators  and these moved the flight controls. The Autopilot (AFCS) could electrically signal the control valves giving a kind of analogue FBW.

 

The boost packs could also be reconfigured in an emergency by pulling the Boost Out handles at the FE's feet. This reconfigured the geometry of the boost pack 'cage' and gave limited manual reversion. Quite ingenious!

 

On mechanical (cables and pulleys) DC-4/6 type aircraft, the cables operated servo tabs which then gave aerodynamic assistance (like a crude power steering system) and made the controls lighter to move. The control movement initiated the tab first and the tab moved in opposite sense to the control surface giving this assistance.

 

Does that help?

 

Cheers

  • Upvote 2

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this