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RFguy

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Everything posted by RFguy

  1. RFguy
    A friend sent me a photo of their flying, and I saw this !!! The SKyecho on its back ! ROFL. FFS. It MUST be vertical. on its back the GPS signal will be sh1t and your broadcast position will be crap , and your range on ADSB will be bollocks because the antenna is wrongly polarized LOL
  2. RFguy
    All the Jabiru owners I know who are also gilder pilots reckon their Jabiru's need spoilers ! Yeah on the '382, I noticed the 'inverse' behaviour at low Re. that airfoil is quite ''clever' . 'any idiot ' can make a nice high Re airfloil, lots of fluid inertia, a high CL / low Re airfoil is more finesse. Rod's J230 wing (and J170) seems to just keep on flying , right until the bitter end. There is VERY LITTLE perceptible increase in drag as it gets slow. It just keeps flying. Mind you, a strongly provoked climbing, 30 deg bank, uncoordinated full flapped power on stall putit into a immediate 180 deg spin entry, quite nose down facing the other way .... LOL I will always remember that one... My simultaneous awe of what happens so fast and associated expletive my instructor said was impressive......it was a good lesson is just how much an otherwise well behaved aircraft can bite if provoked
  3. RFguy
    that's what happens when you taxi in and dont cut the engine early enough.
  4. RFguy
    so the '382 ...... wow the CL/Cd versus alpha is really mild mannered , quite a soft dome. IE a good range of high L/D v AoA - compared to a '2412 .. The 382 airfoil shape reminds me of an aircraft canopy and fuselage side on. I quite like the jabiru 230 wing. (4412 or 4414 I think) . chord is only 1m of course (lower Re) ... is high aspect. low induced drag, thus likes to float, drag does not go through the roof when it gets slow, thus not so good for short landing in my opinion where you want an airfoil that ramps up the induced drag when it gets slow (IMO) .comments ?
  5. RFguy
    for those interested, the expansive report on the NACA 23012 is available from 1934... https://ntrs.nasa.gov/api/citations/19930091603/downloads/19930091603.pdf as for tomcats, there are no RAAus swing wing / variable geometry aircraft, that I know. Cirrus have that dual airfoil wing. I guess we do variable geometry all the time in boats, I'm going to look up the airfoil used for the B2 and head to bed shortly after.
  6. RFguy
    Love it . How about some reflexing flaps to increase Vso and thus Va ? or does it hurt L/D too much ?
  7. RFguy
    In RAaus, as you all know, you must get your CAO100.5 every 2 years like any GA plane. (The air and static systems/ transponder baro checks ) However is RA, just seems nothing happens in RA if you dont do it. In GA, well you wont get a maintenance release and its grounded. Not sure how they deal with that, or at the moment if it is blissfully ignored. While aircraft vertical spacing is in my opinion, rather relaxed compared to the requirements, IE your altimeter would need to be country nautical mile out before you ran into someone 500' above or below you, It's important in CTA/CTR that people are where ATC expect them to be. There's probably more likeihood of an aviator not setting their altimeter for local or area QNH than it being out by a mile. Fortunately the transponder sends baro, and ATC can figure it out from that. but altitude encoders with their lots of parallel data lines are notorious for having a bad line and hence 100' error. (or much more if two lines are bad)
  8. RFguy
    I wonder how many other pilots he regularly associated with, and how many peers imparted airmanship ? I think that's important for a newly minted pilot. all my peers we talk about how easy it is to kill ourselves by various methods in an airplane- and how we are not going to , how we've goign to avoid not doing so, and examine a range of factors to infinitum. it's funny-serious talk. It would all sound rather macabre to others, but not aviators.
  9. RFguy
    after reading that article. lots of failures eh ? a litany of serious failures from one end to the other. One shakes their head and rolls their eyes. Now , how come this one has in inquest, but most RA accidents do not get one ?
  10. RFguy
    like everything and everyone, the 'performance' of a LAME is variable. No surprises. I think before crucifying LAMEs etc in general, one needs to know context. Did the customer want to spend no money ? Was the customer a PITA ? Did the aircraft have so many problems the LAME doesnt know where to start without p1ssing off the customer ? An aircraft can be airworthy but not pass muster under the subjective examination. Subjective !,
  11. RFguy
    which is interesting context considering the road death count has been going up not down. I wonder which of that list (above) would be applicable for them to try and target. Of course speed is some issue, of course it is, because if you had zero speed, there would be no accidents. Can they enhance the skill level of drivers ? I think we're at the point of the limit of what you can due to general human society. Improves the roads is one way. In vehicles you coudl say with the plethora of driver assist tech that we are "You enhance the specification of the aircraft flown" . SUbstance control (RBT) dealt with alcohol in the 70s.
  12. RFguy
    anything like a turn in a lazy 8, or a energy exchange mustering manourver ?
  13. RFguy
    I see Roundsounds posted the same thing. there you go QED.
  14. RFguy
    KG said : "One thing I did note was he was 200' high throughout his downwind leg. ERSA says 1,300' but he flew downwind at 1,500." BUT ! But that's just baro pressure, not adjusted for QNH. either he didnt have is altimeter QNH corrected or the QNH departed substantially from the calibrated). In a transponder, you dont tell it what the QNH is of course. It assumes ISA for altitude I dont know ith Flight Radar etc adjust for local QNH like ATC radar screens do.
  15. RFguy
    Possible skippy that he had a big NE tail wind? hence ending up with a very deep downwind if he was not lookin gback at the strip ? (and resulting low airspeed even though 79 kts ground speed, but that would be a 30 kts tailwind to have a '172 run out of lift in cruise, well more than that because the aircraft would have been low in weight so perhaps 35kts tail , not sure I buy that, instructor wouldnt send him up in the wind) . so, no I am begginning not to buy the stall spin cause. unless he got disorientated, distracted started looking around and didnt take care of the ASI....
  16. RFguy
    Fortunately, being VH- , the aircraft maint records will be combed over , the aircraft inspected within an inch of its life etc etc and the wind at the time 3:10pm local was ... dunno cant see back that far, suspect (S) easterly component. Instructor would not send him up if it was appreciably windy. For the crash to have happened there, smells of base turn stall spin. if he's had engine trouble surely he'd head back toward the RWY downwind ? over the ground there he was only 700 ' above it. airport is at 250' . I've never done a circuit at Camden , are their optical / ground proximity tricks that play with your perception in the hills down that corner ? Can't really comment further until maintenance/condition info produced.
  17. RFguy
    RA-AUS aircraft need to be evaluated per CAO 100.5. every 2 years just like GA aircraft. https://www.raa.asn.au/nsm/week-5/instrument-and-transponder-calibration/ CTR for RAAUS should be simple enough 1) a few radio proceedures- you need to know what to expect :::: what sort of information will be requested of you, info you need to automatically volunteer , and what sort of directives they're going to issue,specifcally entering CTR/CTR, departing, startup and taxing and holding etc 2) Class C is easy, just do what you are told. 3) Class D requires alot more awareness and knowledge of the local proceedures for the area and Aerodrome. that can be hectic. Really not much to learn but can be a handful as the above can occur simultaneously AND if you have to throw in weather, busy radio, unfamiliar airspace - which only needs CURRENCY to fix that., Most country GA pilots I know stay right away from CTA/CTR due to currency confidence.
  18. RFguy
    yes, that is a dynon servo which is a crude but effective device- a stepper motor and a gearbox. . that looks more like part of an autopilot than a control system trim servo, but could be. Stepper motors have high inherent torque and dont need much gear reduction to get the required torque (for this application). turbs illustration post is a screw jack - (or lead screws) are generally run at high ratio with high speed small motors and there is significant resistance to the screw jack moving when force is applied to the actuator tends to impose high friction forces dependin gon the construction (screw thread - acme screw jack) or reciprocating ball screw. A screw jack reduction ratio is the force application circumference divided by the screw pitch
  19. RFguy
    from the article. "Aircraft engineer Peter Marosszeky" says you need 25 hours at 16yo . that's a crock of sh1t. Many kids go solo 8 to 16 hours and dont fall out of the sky. It's the old guys that need lots of hours. Now, the instructor's appraisal and evaluation, that is something different. I'd done quite a few glide approaches, and simulated engine failures (including upwind ) by the time I had my first solo, so I was prepared for say, an engine failure in circuit.
  20. RFguy
    I dont think we should cease guessing/ evaluating. Remember two experienced pilots.....If control surface control failure can be eliminated, ---Only a stuck control surface control is my thought. spanner stuck in the elevator or roll control etc ? if it is not that, I a, guessing the flying pilot had a medical episode while the other pilot was looking out the window looking at something else, and then things got slow and the aircraft was too slow, too low and now too late to do anything about it. What else is plausible ????
  21. RFguy
    so what do the other 35% who do not agree to pay more do ?
  22. RFguy
    I learned spiral dives , how you get in one, and how to recognize them and terminate them. wings level and throttle to idle ... Pretty basic stuff. Not recognizing them will ensure a quick trip to the obituary columns. and I learned and practiced how to hold the airplane in a 60 deg banked 360 deg turn nose correct attitude holding altitude and hit your own wake. That was a pass....
  23. RFguy
    I'd buy the bonanza . And a J160 for when I wanted to go cheap, and hold my J160 to a high maintenance level. (WRT- Bonanza) - I feel older certified aircraft are very good value for money , with their advantage of 50 years of knowledge about them and most bugs known.... These days I probably wouldnt touch a factory built aircraft model any less than 10 years old- it hasnt had enough time to accumulate some ADs !
  24. RFguy
    ooh ahh forward trailing edge taper wings like the low wing brumby.
  25. RFguy
    now comes the more advanced stuff, interspersed with the instructor sending u up to do a few exercises from time to time.
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