Fred₂O

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Fred₂O last won the day on April 16

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About Fred₂O

  • Rank
    Won't Leave!
  • Birthday September 1

Profile Information

  • Gender
    Male
  • Location
    KTCL
  • Interests
    Aviation, fluid mechanics, hydraulics.

  • Reg #
    N2903L
  • Model
    '67 M20C

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  1. Stall speed of Cessna 182 is 50 kt. A M20C stops flying at about 56kt in a full stall with full flaps, but it takes a bit of float to get it to the stalling AoA unless you approach real (too) slow. Your 2300' grass strip would scare the heck out of me. Disclaimer: I've got about 200 landings in a Mooney M20C, none on grass.
  2. In a model C Mooney, nothing is easier to ignore than that six-pack of tiny little gauges over near the co-pilots' left kneecap. I think there is a reason why later models moved those gauges front-and-center. In the original C the ergonomics of the Garwin gauge cluster is terrible. With a modern engine monitor placed in a more visible location and with its greatly improved legibility, I can include it in my scan without having to put my head in the co-pilot's lap. The use of numbers and bar-charts eliminates parallax effects in interpreting gauge needles. I can see important stuff, such as that time that I was told to expedite my departure, skipped a few items on my checklist, and started to take off with lean mixture. The engine monitor EGT bars turned yellow and I pushed in the mixture. I'd say that is perhaps a good example of that engine monitor "earning its keep". Oh, and a certified engine monitor allows you to remove a bunch of antique gauges, and keep all the flammables firewall forward. During a recent airshow I spied pressure transducers in the nacelle of a DC-3. I asked the maintenance guy about it- he said the pilots love not having fuel dripping on their shoes when some fuel pressure fitting starts leaking. Antique taildragger maintenance guy says that he really likes having a modern engine monitor...
  3. I installed the AV-20-S. Here are the pluses. It can display OAT, buss voltage, and TAS on the main screen. I agree with @gsxrpilot that the timers are nice. It has two user timers, plus an "engine run time" timer that starts counting when the buss voltage exceeds 13-ish V, which occurs during runup in a/c with generators. It also has a "flight time timer" that starts when it thinks the pressure differential across the pitot and static lines is enough for 40 kias. I use that one to time when I switch fuel tanks. It also has a mems-based attitude indicator that I find to be well in agreement with my vacuum driven one. I bought it for that feature because a good timer with a backup AI is cool. On the other hand, in the less-than-cool category, it has an OAT sensor that uses the DAVTRON temperature probe. It is calibrated using a menu-based "trim" setting. When I calibrate the temperature probe vs. whatever temperature source I can obtain at altitude, it seems consistent. But, when I compare the indicated TAS vs what the Garmin 430W tells me is the TAS when I change the temperature, pressure, and CAS on that menu, the AV-20-S indicates 4-6 kts higher. The Garmin 430W agrees with three-course groundspeed method of making TAS measurements within about 2 kts. So, whatever algorithm the AV-20-S is using is not that accurate. I have found that I can adjust the temperature "trim" setting to get the TAS to match, and then the temperature is off. Something is not right in the TAS calculation based on the air temperature. It advertises having a "probeless AoA sensor". In my experience, the probeless AOA indication on the AV-20-S is useless. In theory it should work at 1g based on measured V, dP/dt and nose angle relative to the horizon based on the mems AI. However, as g deviates significantly from 1.0, due to turning or some other acceleration, another variable is introduced to the equation that the probeless AOA sensor cannot resolve related to angular accelerations. I contacted the company and was told something to the effect that the probeless AOA has not yet been calibrated in a Mooney. I think that was a polite way of saying "fuhgeddabouddit", so I have. I turned it off because it was distracting. It has the ability to serve as a g-meter, but since I don't do aerobatics and I know to fly in the green arc when it is rough, I don't ever use it. My 2-cents worth. I'm glad I have it for the useful timers and backup AI with 30-minute battery life. The other functionality is of questionable utility in my opinion as a rank private pilot. YMMV. I do not recommend it for its purported ability to accurately indicate AOA.
  4. Ok, I'm dreaming. Just in case- assuming a set of split rear seat backs from a 67E will install and fit in a 67C, I am looking to buy them. Impossible dream?
  5. Resurrecting this thread because I have need to find a good source of certified upholstery material with burn certs. I have neither time or desire to get in the flame testing business. A long-term search of the interwebs turns up mom+pop operations that don't stock samples, or firms that seem to specialize in the interior of multi-million $ jet-propelled time machines. I see that Aircraft Spruce stocks vinyl. I need a good source of fabric. We're going to put sheepskins on the two front seats, so they will be upholstered entirely in vinyl. The bench back seat should be mostly fabric. Our a/c will ultimately be painted red over white, kind of like @Bob_Belville's bird that looks soooo good. So I'm thinking we need some kind of redish/brown fabric and tan vinyl. Finding a site to buy the fabric has proven elusive. Any suggestions? Thanks in advance.
  6. Yes, @Yetti raises a good point. Mooneyspace has a 1980's library era search engine syntax that is really cumbersome to use to find anything. It seems that one member, and only one member, has mastered it. It is not @Yoda but @carusoam. You can seek out his knowledge. Alternatively, you can do as suggested and do this in google (without the quotes): " LED landing light site:mooneyspace.com" Answers you will find. Old threads you will revive.
  7. Our a/c has installed one Aero-Lites Sunsetter PAR 46. Four of the 18 LEDs have light dispersal gratings over them which makes it a combination landing/taxi light. It is so much safer when taxiing than the tightly focused incandescent energy waster it replaced. The picture below was taken when I was about 3-4 miles from the airport at dusk. I always fly with it on.
  8. The prior owner installed this small satchel using two of the screws that hold the plastic window liner in place just above and forward of the pilot's left hand arm rest. It is a handy place to keep sunglasses/readers.
  9. I use this for the U.S.: http://visitedstatesmap.com/ For Australia, I rolled my own from a gif of the country. I made them both to scale more-or-less.
  10. Welcome Jeremy. A new engine monitor makes a great early upgrade- a certified one gives you the ability to take out a lot of old legacy instrumentation, and keep all the flammables forward of the firewall. They don't cost that much and are relatively painless to install in my experience with the support of a good A&P IA. Frees up a bunch of panel space too.
  11. @David Lloyd thanks for that. With a new IR, I was curious if there are noticeable symptoms. I agree that your wife was really on the ball with that one. I installed the Aerovonics AV-20 timer, which includes a lot of lagniappe, one bit of which is a MEMS based attitude indicator that serves as a backup to the vacuum AH, and as a 30-minute battery. An expensive timer, but cool to have in case of a vaccum failure. In my experience it agrees with the analog AH quite well.
  12. Hey, tell us how you noticed. Was there noise, vibration, or just instrument misbehavior? Just curious what signs you had, especially while taxiing. Thanks!
  13. "Oversquare" is an arbitrary definition, inches and rpms have nothing to do with each other. If you use m.p. in mm Hg, and rpm in radians per second, whoa boy!
  14. I excitedly searched through the 1980 pdf of the Maint. Manual for this procedure. They call it the "prestall warning". A search through the entire manual using terms "prestall", "stall warning", and "stall " found no mention of this warning adjustment. Can you tell me the page number? Maybe that instruction was in an SI or SB?