3rd harmonic

Against what may be considered sensible or advisable, i decided that the buying a repairable wreck of a Morgan Sierra might a challenging and satisfying project!? As a brief history: The aircraft was built from kit supplied by Morgan Aeroworks and unfortunately after only a couple of flight hours, ended up suffering a loss-of-control on landing accident. Insurance was claimed for the value of the expected repairs which were substantial and although it wasn't considered a total loss, the salvage value of the wreck was not very high compared to the cost of the original build. The accident damage mostly confined to the nose of the A/C. nose wheel folded under and snapped off damage to the firewall and floor. Prop strike, prop destroyed. Engine mount cracked/bent/broken. Very minor damage to the winglets and wing leading edges right at the tip. The wreck was sold to a guy who trailered it to Melbourne, where it sat in a storage unit for about a year. I brought it off him and trailered him back to SA in an epic 2 day road trip. As pictured on a very large car trailer. I have chosen not to identify the original builder explicitly, to be fair as i don't know the guy at all. Of course there may be some sensitivity regarding the accident, i can only imagine it was NOT a particularly enjoyable experience. In anycase it's really not relevant to restoration going forward. Thing have progressed abit from here, but just an initial post to start the ball rolling... Ab

3mm is a pretty small vent tube, I'd be more worried about it getting blocked by dust and/or mud flicked up off the ground than wasps. But mud wasps are an absolute bugger where I live in the Adelaide Hills. They blocked up the air inlet on my compressor and so when I turned it on the dirt was sucked in and damaged/broke the spring steel check valve in the cylinder head! Then last year went to start our generator during a power outage and it would sort of fire but then stall. Didn't take too long to work out the little sods had blocked up the exhaust right down inside the muffler! We decided to run it without the muffler, running any motor without a muffler is fun for a abit but the novelty quickly wears off... Took me ages to clean it out flooding it with water from the hose and the long compressed air jet nozzle. They did the same to my neighbours fire pump muffler with partial blockage and the mud had been baked into hardened ceramic by the heat. Little vandels!

Yeah, i had to do a quick search to look at what a Sadler Vampire even was and it is an interesting looking machine... The Rutan Long-EZ is another aircraft in that vein that springs to mind - the retractable nose wheel arrangement on those looks like it could collapse at any given moment and they have to park the A/C with it retracted, but somehow they make it work!? Still only a problem if there actually a nose wheel in the first place 😉...

Correct - the Morgan's do have a reputation for nose wheel collapses that is unfortunately deserved. Mine is no exception and suffered a N/W collapse, prop destroyed, bottom firewall damage ect. But the consensus is that a variety of factors that have contributed the disproportionate number of failures, not just the strength of the N/W leg - the position of the main gear, the sight picture when flaring, also weight and balance with the fuel tank up the front ect However the worst thing (by far) is the jokes that stem from the one that crashed in to the Ferris wheel... As laughable as it may be, the people survived and apparently Ray T reckons it was repaired not too long afterwards

G'day, circled for a long time on these pages. Then got round to creating an account, couldn't resist commenting on something audio related (as my professional area of expertise). But thought i should do a legitimate post. I've done most of my flying at YADG (Aldinga) with Adelaide biplanes, in the Sporty's, Cubcrafters cub and Aeronca Champ (both tailwheel) Very much enjoy the tail wheel flying as it has helped improved my skills considerably... Although did my first bit of flying at Camden in Sydney through Cadets in the early 90's in a Tomahawk. For family reasons (kids), flying has been on/off again for the last 6-7 years, actually most off rather then on - sigh! Anyway, against what might be considered sensible i brought the written-off wreck of a Morgan Sierra 19-5645. It was previously built and owned by someone else on this page and i brought it off a 3rd party in Melbourne after it had been sitting in a storage unit for a while. The intention has been to restore it to flying condition, with some improvements along the way. But for the same reason (Kids - i mean they are wonderful, but why would you??), plus house reno's, full time work ect the project has been inching forward at a pace that might be considered less than glacial. Still i have been getting somewhere and i do appreciate there is considerable collective knowledge/wisdom from the members who frequent these pages - including the resident know-it-all (i mean that in the nicest possible way) Nev People sometime refer to me as a know-it-all, so it takes one to know one. The jokes and banter is good value too!! I did meet Ray T, who is at Camden coincidentally who was really good talk to, I might post something up in the Morgan section in due course... Cheers Andrew

The reference to Analogue Gnd or more accurately signal Gnd in this context, is different /separate to the Chassis/negative supply Gnd Often on audio gear that has both Digital and Analogue interfaces there are separate grounds for those respective interfaces, especially if the signals are unbalance (RCA) which they are in this case. Internally the signal ground will (hopefully) be free of any contamination from currents drawn by the RF output stage or digital parts of the radio. Yes, i'd say it would be a reference for the headphone outputs - these would normally expect to see a 32ohm load minimum, an 8Ohm speaker may overload the output - the specs in the manual may have some limitation with regard to this...