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  1. Marc Zeitlin

    Switching Options of Essential Equipment

    Well, I only have MY airplanes, but I work on 10's of others (maybe 150 different N numbers, total) so I'm certainly not a statistically significant sample but I do have some anecdata. Given all the failures that many folks have reported (here and elsewhere), it at least seems that the 1e-3 -...
  2. Marc Zeitlin

    Switching Options of Essential Equipment

    Ooh - ooh - add one Master Solenoid failure (on the ground) and one coil failure (on the ground). Both caused scrubbed flights, but no in flight issues. If you people keep listing possible failures, I'll probably keep remembering stuff that failed in the past 22 years :-). So, yeah - 1e-3 seems...
  3. Marc Zeitlin

    Electrical System Clarification

    And all I've got, wrt E-AB aircraft, is the OL's stating that a CI must be performed in accordance with the scope and detail of Part 43 Appendix D. Which says, in paragraph (C)(6): (6) Batteries—for improper installation and improper charge Pretty vague (like ALL of Appendix D). Improper...
  4. Marc Zeitlin

    Switching Options of Essential Equipment

    An interesting point (and I understand @rv6ejguy's issue with diodes). While I have NOT been checking for my FI diode status during runup, I believe that I can. If I turn off one bus with the other live, if all diodes are working correctly, the engine will run (on one ECU, one FP, one Coil, and...
  5. Marc Zeitlin

    Electrical System Clarification

    Do you have a pointer to this requirement?
  6. Marc Zeitlin

    Electrical System Clarification

    Lead Acid batteries, yes. Lithium, no. They're a lot harder to determine the charge state of, unless you have access to the output of the BMS.
  7. Marc Zeitlin

    Switching Options of Essential Equipment

    No doubt that there are those that have had very few electrical (or other system) failures. In my plane, in about 2000 hours of operation, I've had 4 electrical system failures and four mechanical system failure that I can recall off the top of my head (no structural failures, that I can...
  8. Marc Zeitlin

    Switching Options of Essential Equipment

    Then just put one on each bus, with a manual switch for the 2nd one that isn't running all the time. You will want some way of turning off any mechanical device (pump, in this case) so that you can work on the plane with the master on without running it. Switch or pull the fuse, etc.
  9. Marc Zeitlin

    Switching Options of Essential Equipment

    I'm going to postulate that you're referring to FlyEFII here, and possibly to their "Bus Manager". I have a couple of customers with one of these, and it's, how you say, not good. It does NOT have true redundancy and does some weird stuff. I do not recommend FlyEFII's equipment - I've had too...
  10. Marc Zeitlin

    Switching Options of Essential Equipment

    As you may know, I've got essentially the same equipment - O-360 engine with SDS dual EI/EFII, two pumps, two ECUs, two EIs. No transfer pump. Z-14 based electrical system, with very minor mods. This Dropbox folder has all the schematics of my system...
  11. Marc Zeitlin

    Scale sandwich composite Honda jet build condensed to 14 minutes

    You are correct. Scaled Composites ONLY used pre-preg with honeycomb core. If anyone believes that they're getting lighter parts with hand laid wet layups and honeycomb, it's only because they're getting weaker parts due to poor adhesion to the core.
  12. Marc Zeitlin

    Spark Plug Adapter Issue

    Klaus only recently (in the past few years) started shipping/recommending 14mm plugs for long reach spark plug cylinders. For many years, the only plugs (and plug adapters) he had were 12mm plugs. That's what I had for many years, and what this Velocity has on 3/4 cylinders. One cylinder was...
  13. Marc Zeitlin

    Spark Plug Adapter Issue

    So here's what I actually did: I didn't have a large enough drill, so I started at #2 and blew air through the cylinder with the piston at TDC I used @Dan Thomas's suggestion to grind away 90% of the adapter, pretty close to the helicoil (the air blew ~90% of the crap out of the cylinder, but...
  14. Marc Zeitlin

    Blended wing ACs are coming !

    Which part of the second paragraph in post #16 was too complex to understand? 30 deg/sec and 45 deg. bank. Go for it.
  15. Marc Zeitlin

    Blended wing ACs are coming !

    Wow - there are so many numbers, of so many different types. What numbers are you looking for? Pi? Any of the Fibonacci series? Maybe some imaginary ones? Assume that a large plane (commercial airliner, whatever) will have a maximum roll rate of 30 degrees/second (probably too high, but that'd...
  16. Marc Zeitlin

    Blended wing ACs are coming !

    We had this discussion once (or maybe more times) before - don't remember the context. But as I said last time, having discussed this in detail when designing both White Knight 2 and the Stratolaunch twin boom aircraft, Scaled Composites was concerned about the off-center roll acceleration issue...
  17. Marc Zeitlin

    remote controlled circuit breakers: ?what options exist

    Which is why Bob Nuckolls, in "The AeroElectric Connection", has DONE IT ALL FOR YOU. You don't have to "design" anything - just use what he's already provided.
  18. Marc Zeitlin

    remote controlled circuit breakers: ?what options exist

    I give up. You win - you're right - reset the breakers - it's obviously the safest thing to do even if your electrical system architecture and execution is right.
  19. Marc Zeitlin

    Spark Plug Adapter Issue

    Thanks - another good idea.
  20. Marc Zeitlin

    Spark Plug Adapter Issue

    I'm no engine expert either, but Lycoming states that 18mm x 1.5mm helicoils are the right answer, and they're specifically for spark plugs. ACS sells them. Never used the Time-Serts (which might be great in other use cases).
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