Tue Mar 19, 2024 1:20 pm
#2013947
On the basis that there's no such thing as a stupid question...I'm asking a stupid question which will seem laughably obvious to those who know such things.
I have very nearly completed the restoration of my Taylor Mono, working under the supervision of my LAA inspector. I'm now in the middle of wiring up the batteries and panel as part of the Leburg installation.
Being honest, I haven't had any experience of electronics since GCSE physics, but I've managed to do a satisfactory job re-learning things as I go; what seemed quite daunting at the start is now less so.
However, the one thing I confess to still getting confused about is earthing / grounding.
Leburg specifies a number of central earthing points, but on a wooden aircraft (with a ply panel) what am I actually earthing and to where?
My understanding is that I'll connect the crankcase to the firewall with a 30a braid, but the wiring diagram also shows a cockpit-side earth point. Where should this be? Should I be earthing the instruments through to the firewall on the same earthing point? Does the fuel tank need earthing?
Having coped with everything mechanical up to this point, I confess that my circuitry knowledge really did leave my brain once I had left school.
I have very nearly completed the restoration of my Taylor Mono, working under the supervision of my LAA inspector. I'm now in the middle of wiring up the batteries and panel as part of the Leburg installation.
Being honest, I haven't had any experience of electronics since GCSE physics, but I've managed to do a satisfactory job re-learning things as I go; what seemed quite daunting at the start is now less so.
However, the one thing I confess to still getting confused about is earthing / grounding.
Leburg specifies a number of central earthing points, but on a wooden aircraft (with a ply panel) what am I actually earthing and to where?
My understanding is that I'll connect the crankcase to the firewall with a 30a braid, but the wiring diagram also shows a cockpit-side earth point. Where should this be? Should I be earthing the instruments through to the firewall on the same earthing point? Does the fuel tank need earthing?
Having coped with everything mechanical up to this point, I confess that my circuitry knowledge really did leave my brain once I had left school.
FLYER Club Member
What you'r attempting, is a non-switched return path to the battery. Wire-sizes are determined by the current they may be expected to carry, addinc a safety-marcin to cover fraying, broken conductors etc. Remember, weight is important on an aircraft. a single-point on the bulkhead will eliminate hum-loop potential, but also introduces a potential single-point failure.
Bear in mind that the metal body is used as a return to save on wiring. Static- discharge is a whole other can of worms! Heavy cabling is really only needed for start and generating purposes keep them short between them and the battery, use fine multi strand cable to minimise stress cracking due to work-hardening and for the same reason , secure all against "flapping." hth.
