Davenport system or Electric trim

[Anthony]

Good Evening,

I have a couple of questions about Davenport trim system and electric. I am a new builder and want to build a trim system for my Cozy III. Being a new builder i am kinda not understanding how this would work. I see it does cause of years of use, and does anybody have the plans and working pages.

[Kent Ashton]

The pitch trim in these airplanes has to pull the elevator down against air loads most of the time.  Not to put you off but there are three canard forums and a cozybuilders  group that have discussed pitch trim systems many times.  Use the search function here and on those sites and you will learn a lot.  Google and google images will also bring up discussions and pics.  Here’s a thread from the cozybuilders group, for a start

https://groups.google.com/forum/m/#!msg/cozy_builders/pyh7c3zgRok/uWL_T23ZBgAJ

[macleodm3]

I have attached the Vance Atkinson electric pitch trim design and the Davenport pitch trim design.  The plans for the Cozy include manual pitch trim which works well.

If you want to make the Davenport electric, then just swap the 1/2" control rod out for a 12V electric actuator.

 

 

Davenport_Pitch_Trim_Spring.pdf

Edited January 29, 2019 by macleodm3

[ashtonb]

Has anyone found a good replacement spring for the Atkinson Pitch Trim? The True Value spring no longer is available. Thanks, Brian

Edited January 30, 2019 by ashtonb

[Anthony]

Thank you Everybody! Got some good reading in, and plus found the electric fuel probe thread. 

[Al Smith]

Anthony, if you want to know more about these trim systems and some of their limitations, call me at (909)331-8106.  I have flown the Atkinson system as well as the original plans manual trim Cozy III.  

Al Smith