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PT20J

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Everything posted by PT20J

  1. PT20J
    You should use the speeds in Section III of the POH/AFM for your airplane. Best glide occurs at a specific angle of attack, so the airspeed will vary with weight. This is because lift = weight and if the angle of attack is constant then CL is constant so the airspeed has to be variable. The heavier you are, the faster you need to fly and the faster will be your descent, but the glide angle will not chsnge.
  2. PT20J
    Glide ratio and one glide speed are entered in config mode. There is no adjustment for weight. But after Smart Glide activates the GFC 500 in IAS mode, you can adjust the airspeed up or down with the thumbwheel.
  3. PT20J
    That pressed in zerk is a PITA on my plane. I usually have some trouble getting it to take grease. It helps to partially retract the gear and move the wheel up and down slightly while lubing. The fitting is an Alemite 3019. It doesn’t have a checkball because of its small size. Here’s a link with lots of good info about zerks and they sell a tool for setting a new pressed in zerk. https://www.huyett.com/grease-fittings-faqs
  4. PT20J
    Aerosnell 7
  5. PT20J
    According to Timken, the optimum adjustment for maximum bearing life of tapered roller bearings is zero end play and slight preload. I’ve always adjusted wheel bearings on cars and airplanes using the manual method described on page 6 of Timken’s manual. https://www.timken.com/wp-content/uploads/2016/10/5556_Bearing-Setting-Brochure-1.pdf
  6. PT20J
    Some of these displays do not appear to be configured properly per the STC. Engine gauge Display Option should normally be selected as Auto in configuration mode.
  7. PT20J
    Paul The Maxwell’s are great folks.
  8. PT20J
    In the takeoff trim position, the elevator should be aligned in trail with the horizontal stabilizer. On Js and earlier, the trim assist bungees will hold it there. Set it and adjust the cable to put the indicator in the proper position.
  9. PT20J
    Did you clean that or did it really not have any grease in it. I used to replace wheel bearings every few years when my '78 J sat outside. Even my '94 J that has always been hangared has minor corrosion pits around the seal area. The felt grease seals need to be kept oiled and even then they let water in. I switched to the new molded rubber seals and haven't had any issues. But they are not for CBs
  10. PT20J
    Here's what it looks like:
  11. PT20J
    According to onlinecomponents.com, the V3-2451D8 switch is discontinued and the recommended replacement is a V7-5F17D8
  12. PT20J
    I keep a copy on my iPad. AWBPC0001.pdf
  13. PT20J
    The races are a shrink fit. Getting that loose would require removing material from the wheel. Have you verified that the bearing is correct part?
  14. PT20J
    You also want to make sure it doesn't leak water. The storm window area can leak water down behind the trim panel and there is a bracket there that attaches the window that is pop riveted with steel rivets to a structural tube and if water collects there it can rust out the rivets and leak down inside the tube and migrate to the bottom tube where it rusts the tube out. By '91 I think Mooney was covering the rivet heads with Proseal, but earlier models just had bare rivets.
  15. PT20J
    To check the gear preloads properly according to the manual, you have to lower the gear manually.
  16. PT20J
    That seems much more reasonable to me than modifying the airplane in such a way that might cause an issue for a subsequent pilot. If someone ever needs the emergency gear system, they will likely already be under some stress and don't really need to figure out how an undocumented latching pin works.
  17. PT20J
    Here's a solution for all you folks that live in California but seem displeased with the state: https://www.nbcnews.com/news/world/denmark-should-buy-california-petition-trump-greenland-rcna191806
  18. PT20J
    How did we go from troubleshooting a failed flap relay to avionics power relays to starter relays to golf cart parts?
  19. PT20J
    If you adjust the latch like the factory built it, it doesn’t need a pin.
  20. PT20J
    Well, it certainly qualifies as a very expensive STC that keeps on costing. Bummer.
  21. PT20J
    Just be aware that most of the rocker switches are also circuit breakers powered from the aux bus which is powered from a single breaker on the circuit breaker panel. So, unless you replace them with appropriately rated circuit breaker switches, you will need to do some rewiring and install additional circuit breakers somewhere.
  22. PT20J
    Sounds like you are looking at the Lycoming altitude performance curves or the Aircraft Power app based on them. If so, those curves will overestimate power because they are based on test cell measurements with no exhaust system or induction system losses. You need to reference the POH power tables that are based on the airframe installation. Very doubtful you could get 85% at 6500’ (BTW, was this indicated or density altitude? What was the OAT?) Also, the fuel flow doesn’t sound high enough for that much power. Comparing the TAS to the POH should give you a check on power.
  23. PT20J
    M20J SN-0001- 24-1037 had a wingspan of 35'. Thereafter, the wingspan is 36' 1" according to the SMM. The advantage of the wingtips is added recognition lights, and lower roll forces because the ailerons are moved inboard away from the tip vortices.
  24. PT20J
    25 squared at 6500' is somewhere around 75% power. According to the IO-360 Operator's Manual Figure 3-6 it should burn about 73pph at 75% and 2500 rpm best power mixture which is about 100 dF ROP. This is 12.1 gph. So 11.7 at 50 ROP is in the ballpark. My M20J POH lists 10.4 gph for 75% at 2500 rpm at 25 dF ROP. So, again 11.7 gph at 50 ROP is in the ballpark. If it's running well, I wouldn't fret over it. Another check is that you should be getting around 18 gph +/- at sea level 2700 rpm and full throttle.
  25. PT20J
    That sounds about right. The FF drops off when you go LOP if you keep MAP and rpm constant due to improved brake specific fuel consumption (gph/hp) because all the fuel is being burned as opposed to some being unburned ROP, and also because the engine is producing less power.
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