Area-51

Morse chain, hydraulic tensioner; backlash vibration and noise problems gone away...

Question for forum brains trust... Which antenna connector plug is used for the Stratus-3 adsb receiver? Looks like both are some kind of push fit style...

That is the assumption flying around the entire rotax community... Another assumption is the one regarding violent power pulses from the little sewing machine motor revving its guts out while producing output to the gearbox; hence gearbox dog gear function... Morse chain would be the better choice for this unit... Easier to just pay money, service machine, pay money, fix machine...

All those points above should be noted for consideration. One thing i will say is, after installing this 100hp unit that replaced the 80hp, on first start up session to check and balance carburettors the engine sounded a bit rattlee; after carbi balance it settled right down... The source of the rattle was traced to the spur gear backlash in the gearbox; at higher rpm it is still traceable as vibration... Out of all the meshing spinning and reciprocating components of these units the spur gear backlash is active to some degree. I am left believing that this is the source of first order harmonic input leading to crankcase fretting. In short it sounds bloody horrible through the stethoscope. If it was an engine that i knew nothing about and somebody brought to me to diagnose i would say that sounds f'd, needs opening up for further assessment... But alas, that's how it is, and it works, and in the bottom of the oil can we will find powdery fine magnetic dust that can be mined and turned into bespoke expensive metallic fleck paint for a custom car paint shop 👨‍✈️

Ozrunways has TAFG which is a useful tool however it does not combine departure arrival destinations together. That being said there are other Wx tool charts in Ozrunways that will present transiting conditions for the flight plan entered.

Was it a successful job interview for RedBull? ☹️

Agree. Maybe someone out there knows what percentage failure rate triggers an AD and lesser SB situation by an OEM.

Agree; not sure about percentages but many Series-1 units are still flying on condition without any issues.

This issue was rectified with the release of the Series-2 9XX engines around 2005. The crankcase fixings were revised to M10 main bolts with integrated threaded heads and threaded M10 crankcase inserts that the cylinder studs now screwed into. Rotax offered retrofit upgrading of Series-1 crankcases at the time for a fee... Series-2/3 spec'd crankcase engines do not suffer from fretting.

This engine is 1998 production unit; again have yet to split the cases and confirm existence of fretting.

There is nothing uniquely magical about rotax or any other reciprocating engine ever made, the physics remains constant across the entire plethora of them all. A competent and very experienced engine machinist will know what working clearances applied work in the real world, and what clearances fail; repco produced a bible regarding all this in the mid 80's... In my personal opinion stretch to torque studs are a total failure in an environment of dynamic combined gross temperature variations and harmonic modal frequency changes. Within the past 40years i have seen all of them fail when used in a stressed engine scenario; but after a few factory or shop iterations the problem goes away, or the market shuns the product and goes away... A greater number of applied stud dowling in split cases along with a sufficient interface seal is what prevents fretting and associated bearing component damage.

Ok, i think i finally understand this rotax crankcase fretting stuff from a practical perspective; here is my take... The crankcase starts fretting due to stretching of the cylinder retaining studs and modal harmonic vibration at particular rpm ranges; the longer any of the modal frequency bands are maintained the more fretting takes place... As the fretting continues it is wearing away a patch of metal between the two cases; so oil begins weeping and the cylinder studs around the area loose more tension, so combustion induced waste oil also later begins weeping from between head and cylinder joint... The engine remains in free rotation until such time the loose cylinder studs are again pretensioned... then the crankcases are squeezed back together, however the distance at the crank main journal and bearing shell is now reduced thus causing excessive tightness and friction of the free rotation, forcing out the otherwise retained viscous oil film... slacking off the cylinder stud tension again relieves the excessive grip at the main journal allowing the engine to free rotate without effort again... Repair of the fretted crankcases is only possible by refacing the parting surfaces and line boring the camshaft and crankshaft bores true again.

Have flown with one a few times; works quit well for the price, but some iphone apps can pretty much do what the Dynon does just as well.

Its a challenging task, but everybody knows (especially the medua), that in general, if the kitchen bench hobby plane is found in pieces upon the ground it has probably exceeded its performance parameters... However one can still search for a similar power weight style certified aircraft POH and get a ball park impression of the AF's performance across a mixture of various environment factors.

Thats not correct... 1mm = 0.039" 🤓

All registered Tradies will now require a TSIC and display the TSIC while on site, and present their TSIC when purchasing trade related supplies from a wholesaler or asked by a TSIC inspector. Non registered Tradies will not require a TSIC so long as they are being escorted by a registered Tradie displaying a current TSIC... Non registered Tradies are not permitted to apply for a TSIC; heavy penalties may apply for non-compliance of TSIC compliance.

This is an interesting read; better than the daily telegraph or sun mirror... If RU1 zoning then landing and taking off of aircraft is not an illegal issue. Flying under 500' during the procedure of take off or landing of aircraft, complies with CASA regulations. Landing and take off of an aircraft from a paddock; CASA regulations, in short, area must be suitable for the aircraft in command of to safely clear flight path obstacles according to aircraft's climb performance charts and atmospheric conditions. Aircraft Stalls... aircraft do not just suddenly fall from the sky during a stall as many may believe. A proficient pilot will train for this and recover the aircraft well before the aircraft is beyond the point of control. Wind Shear... aircraft can fall from the sky in the event of severe wind shear; but not like in bugs bunny cartoons Proficient pilots will train for this and anticipate an occurrence during both take off and landing in particular wind conditions. Experimental & General Aviation aircraft accidents and incidents... currently statistics have General Aviation aircraft leading the score board on this one. Council restrictions upon airfields... depends how many people complain to council and how regular aircraft movements occur. Flying Neighbourly... most community and commercial airfields have a policy to minimise pissing off the neighbourhood. This does not always align well when the aircraft pissing off the neighbours all come from another airfield and do not land or take off from the airfield the neighbours are complaining about... Risks Profile & Mitigation Strategy... What are the risks and what is the likelihood of them occurring? Low or High? What are the impacts of each risk should they occur? Low or High? Flying an aircraft is primarily all about constant risk management; it does not end until the engine is shut down and keys are removed from the switch. Talking is always best; flying is even better 👍👨‍✈️

Green Machine... Black is in the box. Swapped out 80hp engine for 100hp on Sunday. Primary ground ops yesterday, minor carbi tuning later today before some climb attitude. 👨‍✈️

18/22 sounds cooked; 16/22 is bit on the raw side; 22/22 even the dog walked away 😆😆😆

You can be both stakeholder and steakholder eating steak all at the same time; so its ok, you cannot be arrested or issued a penalty notice

Fact checking will reveal that a "stakeholder", "an individual holding a stake", is an important part of a cohesive society, especially with regard to social and community events... Not to be confused with "steakholder", being "an individual holding a steak", also an important part of a cohesive society, especially in regard to social and community events, however difference can be noted in the later by way of added situational experiences of extended intimate and less public affairs, however this may not always be the case and often a scenario of seeing a stakeholder beside a steakholder in both public and more private situations may be viewed as a common occurrence, the main difference being asymmetrical proportions of stakeholders and steakholders within a more public setting, but this may not always prove to be a finite conclusion and therefore one should always approach all situations with more than a grain of salt.

That is great to know... now a few independent market end users need to perform the same engine on stick test and publish results. If the results are closely similar to factory, great. If they are wildly contrasting against published manufacturer results then somebody is probably telling fibs, or the test environment inputs are dramatically different. ChongQing is a great city. For a wild experience take a motorcycle taxi across town; first 30sec should be enough time to get the adrenaline pumping 🤣🤣🤣

Get shiny new engine, bolt it to a stick; throw an appropriate size and pitched prop on there, start it up, run it full bore to book max sustain power, shut down at TBO, remove engine from stick, bulk strip, measure inspect scrutinise internal components, publish results... Get another engine, bolt it to a stick.... do it all again... Reassemble first engine, bolt it to a stick.... blah blah blah... run it flat out to 50% extended TBO, remove from stick, bulk strip... blah blah blah... Reassemble second engine, bolt it to a stick, run it flat out to 100% extended TBO, remove from stick... blah blah blah... Machines don't give a rats ass for human emotions...