Elevator Nose Rib Measurement Question

A question for you CH 750 scratch builders. I am building a kit but I need to fabricate an elevator nose rib to replace one I damaged. In determining the tip radius, do I use the tooling hole 8mm above the 94mm mark on the X axis as the point of origin? Using the left elevator nose rib as an example, my 24mm radius intersects Yu at 32mm, but intersects Yi at 12mm. According to the chart, Yi extends 18.9mm from the CL at 105mm, a difference of nearly 7mm. Am I looking at this correctly or should I be concerned about the radius end point on the Yi axis? Would appreciate some feedback, especially if I am making this more complicated than it really is.

Views: 226

▶ Reply to This

Replies to This Discussion

Permalink Reply by Clint L Gosch on November 4, 2012 at 5:13pm

Hi David,  I've been studying my form block based on your measurements.  My radius intersects the same Yu and Yl +/- a mm or two.  If I recall correctly, I interpolated a tangent line between the 105mm Yl and the radius to make up the 7mm gap. Just be sure to make a smooth transition to the radius.  Hope this helps!

Permalink Reply by David A. Judkins on November 5, 2012 at 2:28pm

Thanks, Clint. That was my interpretation as well. I worked some on the form block yesterday and it came pretty close. Will try again next weekend with something harder than MDF to form the actual rib. Thanks for responding to my query!

RSS

New from Zenith:

Zenith Planes For Sale 
  

Classified listing for buying or selling your Zenith building or flying related stuff...

Custom Instrument Panels
for your Zenith:

Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. Pre-cut panel, Dynon and Garmin avionics, and more.

Zenith Homecoming Tee:

Zenair Floats

Flying On Your Own Wings:
 A Complete Guide to Understanding Light Airplane Design, by Chris Heintz

Builder & Pilot Supplies:

Aircraft Insurance:

 
 

West Coast USA:

 
Pro Builder Assistance:

 

Transition training:

Lavion Aero

K&S Aviation Services

Aircraft Spruce & Specialty for all your building and pilot supplies!

How to videos from HomebuiltHELP.com

Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit HomebuiltHelp.com for the latest DVD titles.

© 2024   Created by Zenith.Aero.   Powered by

Badges  |  Report an Issue  |  Terms of Service