onetrack

.......showed the whites of their eyes the instant the expanding reamer came out on display, whenever they were playing up, and refusing to perform. When Turbo showed great interest in how this simple expanding reamer display could get the animals to behave immediately, he inquired of the trainer, if it would work on..........

It's just a new and improved maintenance technique for working on brakes, and changing tyres and wheels.

An interesting feature of MAC's is the number of MAC's where a student has been under instruction. Having a CFI on board is no guarantee of increased safety, and an AOPA report states that having a CFI on board and instructing, actually increases the risk of an aircraft crash. In nearly every case, the CFI's attention is on the student, the controls and the instruments, and he/she's not looking out for other aircraft - and often, the student isn't either, as he's focussed on learning new skills. The AOPA report states that MACs (in the U.S.) accounted for 16 percent of dual and 20 percent of solo fatal instructional accidents. I find it interesting that the last two MAC's here have both involved mature, high-hour pilots with with outstanding levels of experience.

News article below.... Sydney plane crash: Off-duty Qantas captain Gary Criddle and man Khadiervali Gagguturu named as two of three killed in light plane collision WWW.9NEWS.COM.AU Grandfather Gary Criddle, 72, known by his friends and family as 'Gaz', was one of two men aboard the Cessn...

Fairchild C-123 Provider. Worst aircraft I've ever ridden in. Crude interior, and barebones as they come. Originally built as an assault glider during WW2 by the Chase Aircraft Co. The only good part about them (to me) was listening to those lovely Pratt & Whitney R-2800 Double Wasps cranking up and roaring away. Good Morning, Vietnam | Internet Movie Plane Database Wiki | Fandom IMPDB.FANDOM.COM Movie (1987) Starring: Robin Williams (Airman Second Class Adrian Cronauer) Forest Whitaker (Private First Class Edward Montesquieu "Eddie" Garlick) Tung Thanh Tran (Phan Duc To (Phan Đức Tô), aka...

All on board both aircraft are deceased. 3 fatalities, all males. No indication yet of aircraft type, but appear to be GA aircraft? Three dead after two light planes collide over Belimbla Park in Sydney's south-west - ABC News WWW.ABC.NET.AU The light aircraft collide midair before crashing into bushland at Belimbla Park in Sydney's south-west.

.....pulled OT up and said, "Where's ya waybill?", in that normal social greeting method used by all SI's, and CASA operatives when asking to see logbooks. But OT was well ahead of the SI in his planning. "The dog ate it", he replied nonchalantly, knowing full well it was a great old excuse, regularly used by Turbo and Cappy when they went to school, and were asked to produce their homework. It was the exact same excuse they used when CASA operatives asked to see their logbooks. "Yair, right", snarled the SI. "Pull the other one, that's got bells on it", as he reached for his...........

I've never heard of "lead fusion" on valve faces, and I can find no technical references, or online discussions about it. The generally accepted principle is that the lead compounds in avgas (primarily TEL or Tetra Ethyl Lead) change under the heat and chemical reactions going on during combustion, to form Lead Oxide deposits on combustion chamber and valve surfaces. I have never seen pure lead deposits in a combustion chamber, because combustion process temperatures are normally high enough to vaporise metallic lead, and because there are a wide range of chemical interactions going on in the combustion process, metallic lead will rapidly form other lead compounds, which are often erroneously referred to as "lead deposits". They are lead compounds, and other chemical compounds, deposits; not metallic lead. Ethylene Dibromide is added to Avgas to scavenge undesirable deposits of Lead Oxide, and when Ethylene Dibromide reacts with Lead Oxide, it forms Lead Bromide, which produces the light brown/ash-coloured deposits we see in exhaust system components. It's a little hard to tell from the photo what the irregularities are on the flat part of the valve face. Are they removable deposits, or are they deposit build-ups or disruptions of the valve face metal? The recessed section of the valve face shows distinct metallic erosion and pitting, which is normally caused by contaminants in the fuel combustion process, such as water. An engine ingesting very moist intake air, takes in a lot of water in vapour form, and erosion and pitting on combustion chamber components is created when the water is heated into steam, and the tiny steam bubbles then implode, eroding the metal. It's essentially cavitation taking place during combustion. The water and steam in the combustion chamber also cleans off any protective deposits on combustion chamber components, thus exposing the raw metal surface to chemical and cavitation attack. Acids are also formed during the combustion process and these also adversely affect the metal surfaces exposed to them. Below is a link to a Shell company article, discussing lead fouling in aviation engines. I believe it's a worthy read to add to ones knowledge bank. Lead Fouling | Preventing Lead Fouling in Aircraft | Shell Global WWW.SHELL.COM This article discusses lead fouling, what causes it and the most efficient way to prevent it in aviation engines. Read the full details here.

....stand behind the goat, which brought a cacophony of jeers and cheers from the crowd around the sale ring (crowds at sale rings are merciless, as anyone with even a small amount of livestock selling experience should know. The jeers and cheers were interrupted by the stock auctioneer, who said...........

And their stall speed is pretty high, too! He's one lucky pilot to be able to escape the cabin before the fire took hold.

Close. The term reputedly comes from referring to the River Dart, whereupon the Britannia Royal Naval College Dartmouth was situated, overlooking the River estuary. Sailors were reputed to have said they were "returning to the Old Dart", as a reference to returning to the U.K. after extended voyages. The Britannia Royal Naval College Dartmouth trained RN officers from 1863, and was apparently an institution which was held in respect by the RN officers. The younger RN officers likely returned to the BRNCD to do further RN officer training.

......question to the group. "Why do the aliens found on the crashed Roswell UFO, look so much like Turbo?" The revelation brought out mixed levels of concern amongst the others. Could Turbo have come from an alien family, and perhaps even just be a humanoid, not a genuine homo sapiens? The thought brought disquiet upon many of the assembled gathering, and one of the group spoke up, "I'd heard before, that Turbo had the ability to put a level of terrifying fear into anyone who crossed him, but this revelation is.......

SE-XFV is a completely different aircraft to the others pictured. It has the canard wing mounted forward of the pilot, whereas all the other photos show an aircraft with a canard mounted behind the pilot. Plus, the fuselage appears to be more squared off at the bottom. Even the wing is different, with the vertical stabilisers mounted inboard, as compared to the others where the VS's are mounted at the ends of the wings.

There's too much emphasis placed on bore condition. You can have all kinds of patterns, wear, gouges, scores and problems with the bore - and the engine will still run reasonably well. But the major weakness of IC engines is poppet valves. 95% of your engines problems will come back to valve sealing and seating and valve head condition. Valves are the most heavily worked part of any IC engine. Sleeve valves and porting really are a much more durable arrangement, but the drive mechanism and clearances are critical areas, and they can't handle high RPM's. In tests of the early sleeve valve car engines in the late 1920's, the sleeve valve engines were still reliable, and still producing 99% of their power output after 80,000-100,000 miles - unlike their poppet valve cousins, which were suffering serious power losses and valve sealing problems, in as little as 40,000 miles. I would have liked to have seen the rotary valve head become more developed and widespread, but inertia and lack of funding, often stopped many good ideas. The Deane Rotary Valve, an extremely promising Australian invention by three Aussie engineers, was proven to work, and be exceptionally efficient and reliable, when tested on a motorcycle engine - but it failed to gain financial backing, and fell by the wayside, as with many good design ideas. Rotary-Valve Internal Combustion Engines. WWW.DOUGLAS-SELF.COM Douglas Self, rotary valve engines, Minerva, Aspin valve, Cross valve, Froede valve, Wankel valve, Mellors Rotary Valve

That's a bearly believable photo.

Well, it appears that Wisk Aero is gradually closing in on the pilotless, eVTOL, air taxi dream. As a fully-owned subsidiary of Boeing, they have a fraction more street cred than the usual Internet/YooToob startups. However, even Wisk won't be drawn into a specific date when their product is finally guaranteed to be safe, and receives certification - but they coyly state they hope that event is, "before the end of this decade". Discover Wisk's Self-Flying eVTOL Air Taxi WISK.AERO Our self-flying, eVTOL air taxi will set the standard for the Advanced Air Mobility Industry and transform the future of mobility. Wisk Partners with Airservices Australia | Wisk WISK.AERO Wisk Partners with Airservices Australia to Incorporate Autonomous Air Taxi Network into National Airspace.

Leaf springs are normally heat-treated in the following manner, which produces the toughness needed. They are heated to 780°C, then quenched in an oil bath. A brine bath can also be used, instead of oil - although oil is generally regarded as superior. This process hardens the steel. Then the hardened leaf or leaves are placed in a furnace, and evenly heated to 380°C, and then allowed to cool naturally. This is called "tempering", and it lowers the hardness and toughens the steel. The leaf or leaves need to be restrained in a jig when being hardened and tempered, as they will normally buckle or curl out of the desired shape.

Try this spring manufacturer, they say they'll manufacture custom springs. Leaf Springs WWW.DOBINSONS.COM Upgrade your vehicle with Dobinsons' high-quality leaf springs for superior load-carrying capacity, enhanced ride comfort, and stability. Ideal for 4x4 and off-road adventures, these durable springs undergo...

Did anyone see how close he came to hitting the wall with the wing? I reckon there's only a few centimetres between the wall and the wingtip, just before he clobbered it with the tail.

I like this part of the description - "The control is done by means of a radio control on a desk in front of the pilot (on the prototype)" Now, where have we seen this dodgy style of control setup before? 😞

Red, the placard is pretty fine print for my aging eyes - but the gist of it is, he's using 62cc Zenoah R/C engines (model G620PU-1) running Walbro carburettors, which are each driving the props through a RADNE centrifugal clutch and a gearbox with a 45mm primary pulley and a 180mm secondary pully, using poly V-belts. The engines use servomotors on the carbies for control. He says the engines produce "6 CV" ("Cheval-vapeur", the French word for HP) each - but that's at odds with Zenoahs website, which says the engine gross HP is 5.46. The French bloke also claims 8000RPM for his Zenoah engines, yet Zenoah say the maximum output is "around 7600RPM". He's really winding those little Zenoahs out! The Frenchman claims the engines produce 25kg of thrust each and therefore a combined total thrust of 300kgs. Not too bad I suppose, if they all keep going at maximum power! He outlines that 6 props runs clockwise and 6 run anti-clockwise, so thus negating any torque issues. He says the frame weighs less than 30kgs and the total mass is less than 100kgs - although above that, he has 105kgs, so some variation in his stats there. The engines are started by flipping the prop or by "an electric device" (type not known). All in all, not too much inherent strength or redundancy there, so I'm inclined to agree with Facthunters, "Pass"! http://www.hobbysupplies.com.au/Zenoah Engines.HTM

Contributors commenting 31,000 times? If I've told you once, I've told you a million times!! - don't exaggerate!! 😄

A 12 rope-pull engine start, would make for an interesting takeoff experience!

The work going into non-pneumatic tyre research is quite amazing. There's actually an improved Tweel-2 now. And Michelin and GM have collaborated to produce a non-pneumatic combined tyre and wheel called Uptis, which is supposed to be getting fitted to new road-going vehicles this year. They'd better get a move on, there's not much left of 2024. The research article below will keep you fully updated, Skippy - but be prepared to burn some midnight oil reading the entire article! You might be able to go non-pneumatic, sooner than you think! A comprehensive review on non-pneumatic tyre research - ScienceDirect WWW.SCIENCEDIRECT.COM Non-pneumatic tyre technology can overcome the safety problems of traditional pneumatic tyres. Hence, it is expected to improve driving safety signifi… Promo for the Uptis tyre ... MICHELIN UPTIS tyre prototype, an airless tyre | Michelin Australia WWW.MICHELIN.COM.AU

Skippy, I guess you could always be the Tweel test pilot! However, the cost of the Tweels appears to be considerably more than a pneumatic tyre, a factor which might put you off! Another point I just thought of - wouldn't the ribs act as vanes when airborne, and start the wheels spinning, thus acting as somewhat destabilising gyros? Are Michelin Tweels worth the upfront cost and do they last longer? - Darra Tyres, Brisbane WWW.DARRATYRES.COM.AU Michelin Tweel tyres are a type of non-pneumatic tyre that consists of a rigid hub connected to a shear band, which is made of rubber and acts as the tyre's