Francesco Pellacini wrote:
I'm building an HN-700 Menestrel, a french project by Henry Nicollier (http://www.menestrel.org.uk)
It's a wood taildragger designed airplane, bi-place.
My actually matter is if I must install a copper braid inside the plane and connect at it every metal parts.
What is your experience about it? Is it absolutly necessary?
I own a Bowers Fly Baby, a single-seat all-wood airplane, with a full electrical system. No special effort was made to electrically connect the various metal parts, and the radios and electrical system work fine.
It's rather funny, sometimes, if I get gas at a place with an attendant. They'll drag out the grounding wire and attach to the tiedown ring underneath the wing...and I have to point out that the tiedown ring is electrically isolated and thus the grounding strap isn't doing a thing.
One thing to remember is to ensure that all the antennas need a metal "ground plane"...basically, the antenna should be installed on a sheet of thin aluminum. The ideal ground plane is circular with a radius equal to the length of the antenna, but for aircraft VHF, that's not really achievable most of the time. Most wooden airplanes end up with some flat sheet metal on the exterior (like a metal pan on the belly) and you can install the antenna on that.
I've got some details on the ground plane I installed on my Fly Baby on my antenna web page . Scroll down about 3/4ths of the way to see the ground plane.