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RFguy

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  1. RFguy
    thanks Nev. I will do some accurate measuring... ironically, it's cheaper for me to just go and buy a new set of pistons than refurbishing this set of 6, however, then I wouldnt get much benefit about learning the process- although I've already done that once. pressure cooker, MEK soak, ultrasonic cleaning, nylon and brass rotating brushes then finally ring lands with broken ring... that was last time, probably half a day a piston.
  2. RFguy
    I use one of those with a bit of string knoted to the middle... VERY fast to use.
  3. RFguy
    yes, always try a test piece. Dishwasher tablets- Sodium Hydroxide - deadly on aluminium. but good for cleaning up valve steams....
  4. RFguy
    Hear say is a that 100% ethylene glycol in a pressure cooker makes a great carbon remover for parts also... Carbon Chemist, what's going on there ?
  5. RFguy
    Thanks onetrack. I will try that. also, its been suggested I try selleys BBQ cleaner. Selleys BBQ cleaner will be for #3 and Supercheap carb cleaner for #4. The fronts are more gunked, the rear pots are the hot ones with the harder carbon. like I said, (last time I concluded that MEK, xylene, acetone etc which I have all wasnt really any better than unleaded petrol....). I have a pressure cooker which I clean stuff in soap, but I am not game to try 1.5 bar 120C boiling MEK etc 🙂 . Large ultrasonic cleaner isnt bad, either. given the top ring land diamond-like carbon was deposited at >250C, I cant see that coming off at much less temperature, but it's worth a go to see what the chemists come up with. I'm just remembering what a bastard job this is. (Bruce, previous engine I rebuilt was sold - this is a 310 h TSO engine I got to refurb ) . Seeing gunk in the circlip grooves is new to me. anyway, parts tank and toothbrush job for that. for me , suggests dirty oil/ oil filter not in circuit . wil check, disassemble PRV , clean etc. Filter didnt have any nasties in it.
  6. RFguy
    pistons have been sitting in gasoline for a few days. (last time I concluded that MEK, xylene, acetone etc which I have all wasnt really any better than unleaded petrol....) Observations (since this is my 2nd 6 cylinder jab rebuild) - top ring land the black stuff, the black diamond is hard, quite resistant to the broken ring tool. The #2 ring, the black gunk appears not to be hard glass carbon, more just gunk that can be pushed out within a few dozen revolutions of the broken ring tool. The oilcontrol lands are just soft gunk. brass brush/toothbrush fodder. There's also gunk in the circlip grooves, which the previous rebuild , similar hours, did not have. would be useful to be able to get the piston in the end of a large lathe chuck at 30 RPM to do some of the work for me.
  7. RFguy
    Where things become tricky and errorsom is conversion of spheroids... This usually occurs between sperical (lat long) and easting/northing etc cordinates, as , as nev says, the Earth is an oblate spheroid. and also converting from good ol' AMG66 to WGS84 or even MGA84, or even LOCAL datums. Large geo projects like the Snowy scheme have their own local datum, to better approximate the bulging earth in the region. I got to learn all this when writing radio propagation prediction programs in the 90s, having to work with all matter of map data , fortunately I had a good mate Joe Monardo who was a surveyor. We had spot height data in AMG66 or a local datum (councils had their own datums) , and I fed this into a terrain forming program called ANUS-DEM from the ANU which was originally used for catchment predictions.
  8. RFguy
    google maps you can select decimal degrees, or deg min sec, or deg decimal minutes.... OME says ": Tooraweenah Aerodrome is 31.44201S, 148.89801E , ERSA has the aerodrome at 31.2630S, 148.5400E" ERSA is DMS (deg, min, sec) . Note that the ERSA DOES NOT have any comma or decimal point. (OME you indicated that it did in your post) "312630S 1485400E" When a fix of DMS is provided, there will be 6 numbers, groups of two digits. longitude here will be three digits for deg, and 2 for min, 2 for sec.
  9. RFguy
    off topic !
  10. RFguy
    hey Mike, your pax has their shoulder harness twisted.
  11. RFguy
    "Seems I have a flooding/overflowing float chamber - will investigate tomorrow." Skippy - Be very mindful of a fire hazard . I know you know this but worthwhile highlighting. Am pleased to see your overflow goes somewhere instead of just into a tray under the carb.... Skip do you have a fuel tank return in the setup ? another thing to .....
  12. RFguy
    Essentially, your BFR is due.. (overdue) . KG I am not sure about exams being done again... I dont think that's right. Certainly you'll need to, as you pointed out, demonstrate competency. Whether the instructor feels you need to demonstrate competency by puttingn you through a diversion intensive wild goose chase cross country or just a few circuits, stalls, emergency proceedures will be whatever is required to feel that you are competent. Usually as long as you dont do anything unsafe, or almost kill the pair of you, you'll get through, with a marginal pass, probably with requirement of some follow up work.
  13. RFguy
    Agreed. RA-AUS's mantra of a "A pilot in every home" is unrealistic and worst case misleading of the hazards in the hobby.
  14. RFguy
    not many options for EFATO at Wedderburn.... (not saying this was any cause) .
  15. RFguy
    Pretty good Bob there is certainly efficiency though to contend with, 1) small motor efficiency probably 50%. so input power now 2x294 = 588J. 2) any filter to push fuel through ? 3) hose- say 4m of 1/2" hose in a circle is 0.1 bar at 10 lpm gasoline , 166e-06 m3/sec, energy loss = ~ 1.66 J/S and 2 minutes= 200 J likely input cost ~ 800 to 900 J.
  16. RFguy
    Cooldrive seems like a site and business very high in hype on their website....
  17. RFguy
    A GOOD cable is that used for wiring up solar panels Decent insulation, current carrying and a tough sheath Some are twin and double insulated, with the overall double as a bonded fig8 which is OK. anythign complying to IEC62930 is OK. double insulated Bonded sheath fig8 zipper pair. twin and overall sheath both good
  18. RFguy
    Figure 8 cable is made in a single extrusion process, the amount of insulation between the pair of wires varies ! you want to use a two pair insulated wire and overall sheath. like this, https://www.jaycar.com.au/7-5-amp-2-core-tinned-dc-power-cable-sold-per-metre/p/WH3057 or WH3049 - 10m Handy Pack slightly cheaper.
  19. RFguy
    The F15 Mr funnel was a bit over a hundred dollars from memory. not a big price tag...... Use a collar of 6" PVC pipe to have it sit square and stable. You need IS grade switches, or a solid state switch. or the switch a long way upwind of each end of the fueling . A switch potted inside a box should be OK. Absolutely NO 'figure 8 ' cable (bonded along a centre line) , and no multicore cable without stainless steel braid and appropriate specifications. Fuse has to be IS rated or encapsulated also.... Consult AS/NZS 60079 part 11. ......part 14, 18 and part 31 are also applicable. (yes I do this for a living) https://law.resource.org/pub/in/bis/S05/is.iec.60079.11.2006.pdf
  20. RFguy
    yeah stratus 3 is an RX box. and the skyecho doesnt make much of its own heat. they're white so they do their best not to get hot in the sun.
  21. RFguy
    I have a twin filter Mr Funnel "F15" and it keeps up with a 20 litre jerry being poured in without pause. ( 20 seconds) ? The twin is rated at 56 lpm. I would recommend nothing less. The single filter versions of Mr Funnel would not keep up. hopw about this with built in filter https://facet-purolator.com/specifications/#ds-open-popup-57 alas only 50 gph or a couple of the 50 gph cube facets. or somethign higher flow : https://www.scintex.com.au/collections/12v-petrol-pumps/products/high-flow-fuel-pump or, the real deal... a filler ! https://www.scintex.com.au/collections/12v-petrol-pumps/products/12v-petrol-pump
  22. RFguy
    an intristically safe (IS) electric pump and hose? dont have the switch for the pump (unless it is also IS rated ) anywhere near the filler... they arc.. or hand driven pump....
  23. RFguy
    No Yes, under normal circumstances . These were operational constraints that required it. Wait till you do some circuits with low cloud and intermittant drizzle , your circuits will be something like 700' etc etc ANyway no trike is going to be out in that weather. and no trike should dare come near a busy aerodrome without a radio. Turbs I think your comment is non sensical, without qualification.
  24. RFguy
    what about them ? sorry I dont understand the question.
  25. RFguy
    I learned 500 ' circuits, which are close to the strip with a 15 knots steady pure crosswind on the grass strip with low cloud. the grass strip made those limit crosswind landings a little more forgiving.... With the wind about 25+kts at 500' the drift was impressive and made flying circuits quite a bit of fun.
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