4VFR.com The Definitive Study Guide for Future Pilots
We Help You Pass
Our free online study guide really works. You can study for your FAA private pilot ground school exam right now. For more info about the 4VFR.COM project, click here. You can find a daily update log here.

Live ATC Audio Streams
Tune into live air traffic control frequencies from North America. This feature requires Real player. Start listening to ATC now!

Reference Library
Our glossary lists and databases have grown quickly. I am working to create an on-line reference library to tie together all the loose ends. You can check out what is currently available in the library

FAA Practice Exam - New!
Introducing our newly enhanced practice exam. Now with figures!. Take a test a day for a week, and I guarantee you will do better on your exam.

Get Started Now

Show your support for 4VFR.COM - Link us. Bookmark us. Tell your mother about us. Press CTRL-D to bookmark this site now!. Check out one of our proposed T-Shirt Designs.

Exams Taken 261

Feature Article: The Johnson Bar

One unlikely aircraft feature was derived from the steam engine. The Johnson bar was used to control the amount of steam and hence the power of the engine. The Johnson bar is a term used to describe the long handles used in earlier Cessnas and nearly all Pipers to operate the flaps. The term has also been used with reference to the bars used on Mooney aircraft to hand operate the manual gear.


Last Modified October 22, ©2026 TAGE.COM
Related Links
Featured Articles
  • FAR Violations In Decending Order
  • Hundred Octane Aviation Fuel
  • Non-IFR Pilot
  • Who's In Charge?
  • Cruise Control
  • Factors in Successful Learning
  • Airline Pilots
  • CFI Abuses of Student Time
  • Fuel/Electric accidents
  • Universal Aspects
  • Operation of Airplane Systems
  • Normal and Crosswind
  • Wind and Groundspeed
  • Teaching Efficiency
  • VOR tracking

    More Flight Training Articles...

    • Student Kudos
    "Wow! Thank you for this wonderful website! I am so thriled to have found it! I am a college student also, and like most students, I am forever short on cash. You have no idea how much this is helping me, I will be a frequent visitor. Thanks again, KO."
    - K O