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  1. wsimpso1

    Switching Options of Essential Equipment

    We all know we need backups on any circuit needed for comfortable completion of a flight. I aim for that. I have several circuits that fit that need, things like transfer pumps, injection pumps, ECU's and Ignition Coils. I am Installing Nuckolls' Z-14 (IFR and Electrically Dependant Engine) and...
  2. wsimpso1

    Piano Hinge Pin Retention

    What designs have you used or seen used for keeping piano hinge pins in place until you want to remove them. The hinges are fiberglass, either with or without brass tube bushings and have very modest working spaces around them. We have already beaten the topic of hinge and pin materials to death...
  3. wsimpso1

    DC Power, Sensing, and Antennas - How to Bundle?

    I have little insight on electromagnetic compatibility. Please help. I have read Aero Electric Connection cover to cover, some of it four times. I know that I am supposed to keep wiring for DC power to stuff like motors separated from avionics, but am struggling with knowing what is what and...
  4. wsimpso1

    When to Use Clevis Bolt instead of a Clevis Pin?

    I have looked and looked and the guidance I find from AC43-13 is don't use the clevis pin if it is continuously in use. To me that sound specious - If it was not being used it would not be in the airplane... which would rive me to clevis bolts and castellated shear nuts and cotter pins...
  5. wsimpso1

    Why are constant speed prop types different in Singles, Twins, and Aerobatic planes?

    Constant speed propellers – I know the basics, they hold engine speed by varying prop pitch for us, engine power permitting. I have been confused by a couple things. So, I started searching, and most of the info out there is pretty darned weak. I am after why we should do what is already the...
  6. wsimpso1

    Any need for trim tab anti-flutter?

    In another thread on Flutter Flutter there were posts 31 and 33 talking about adding a device to trim tabs to prevent flutter. Part 23 was even mentioned as requiring such, but no one cited chapter and verse. Yeah, Part 23 does not apply to us, but it is still usually a good idea. I have done a...
  7. wsimpso1

    Shoulder Belt - How Important is Centered Behind Occupant

    I am In the process of finishing my turtle deck structure, and I have to mount my shoulder belts to it. I know that I want angle of the belt seen from the side to be flat to 30 degrees up as we go aft from shoulder to roof. But to get that angle with the turtle deck contracting in both width and...
  8. wsimpso1

    GS Antenna

    My bird is fiberglass and so the NAV and COM antennas are copper tape with ferrite toroid baluns and are inside my airplane exactly as RST Engineering and Jim Wier say to do them. With a bunch of airplanes out there flying with these guys, I am pretty confident these will work. Where I have a...
  9. wsimpso1

    Skin Panel Bending References - Anything beyond Roark's?

    I am feeling like a voice in the wilderness. I have talked about bending loads on airplane skins due to moving air outside and stationary or even pressurized air inside. I have found that Roark's has a number of equations for stress and deflections of flat plates, giving us a method for...
  10. wsimpso1

    Triple Tree Fly In

    Anyone on here gone to Triple Tree? Tell us about it. Our Flyabout starts in a week and so does Triple Tree. We were going to be in South Carolina for a day or two anyway, and Triple Tree is on then, so what can you tell us about it?
  11. wsimpso1

    Panel Titling: Bus-Tie or Electric Cross-Feed? Position of Warning Lights?

    In the AeroElectric Connection, a connection between two buses is called Cross-Feed, and in my panel design I called the switch Electric Cross-Feed. In sharing my design with a peer group, an ex F-14 pilot thought that switch was engaging a fuel cross feed. Upon discussion, I found that he was...
  12. wsimpso1

    Tire and Tube Recommended

    Hi, Tricyle geared 2150 pound max gross, 5.00-5 wheels and tires 60 knot touchdown speed. Do you have a preference in brands etc for tires for this application, and why? On the store bought, we get fine service out of Desser retreads and wonder why not just by them for the homebuilt? Then for...
  13. wsimpso1

    Cowling Attachment Approach

    Looking ahead to the cowling. I was originally looking at the now standard MS20257 hinge closures on the firewall and along the parting lines of cowl, then looking at just making fiberglass hinge halves for my bird so they can be directly bonded in my fiberglass structure. Then last summer a...
  14. wsimpso1

    Placarding - Enough? Too Much?

    Working on my Instrument Panel. Layout is pretty much done, and I have shown it before, now working on labeling and placarding. Several issues have come up. First thing to know is the electrical scheme is AeroElectricConnection Z-14. Circuit protection is by ATC type fuses. CB’s are only used in...
  15. wsimpso1

    Any Thoughts on EVERYTHING ON switch for take-off, landing, and emergencies at low alttitude?

    There has been the whole electrical reliability discussion over in Bob Nuckolls' AeroElectric Connection and in his list, and discussions on here about them. The basics are: Things break; When something breaks, your systems should be designed so no immediate hazard is created; Things needed for...
  16. wsimpso1

    Parts Wanted Wanted - Scrap/Unairworthy 5.00x5 wheel

    Just like it says, I am looking for a wheel or wheel and tire/tube that is no longer flyable. Using it to work on wheel pants and the like. No need for pretty, but if it still has bearings all the better. PM me on here for email and phone number. Billski
  17. wsimpso1

    Systems Reliability - Need Component Failure Probability Estimates

    I and another EAA chapter member are working on architecture decisions in our respective airplanes. In the process, I have assembled Failure Modes and Effects Analyses for several common options. Unfortunately, we have too small an experience base for confidence in estimating failure...
  18. wsimpso1

    Push the Flat Panel Display Up or Down on the Panel?

    There it is, I can put my flat panel displays, Dynon HDX-1100's, high on the panel and shove my switches and other stuff down low or I can shove the HDX's low and put stuff above them. I am planning this as a single pilot IFR machine, although experienced right seaters will be common. I do plan...
  19. wsimpso1

    Price and Contact Info is Required Information

    I have been finding items listed in our For Sale area without prices. A For Sale item with no price is not really for sale... Our posted rules on For Sale items include that a PRICE is required. You can always edit... Over the last couple days, I prompted members with private notes to get...
  20. wsimpso1

    How to Make (or Buy) Plexiglas Covers for Wingtip Lights

    Scheming out my wingtips and the Plexiglas covers that go over them. So, given that the airplane is a one off, and the tips are compound convex shapes (much like the ones used on RV's). They will be about 10" long, 10" wide, and about 5" deep. So let's get into PROVEN methods of how: Do we make...
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