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  1. Direct C51

    Repairing Small Ding in Engine Mount

    My carb heat box was rubbing on my engine mount and cut in to it a little bit. The engine mount is 4130 steel. After I sanded off the powder coating, it looks to be a couple thousands deep. I have no experience working with 4130 steel tube. How should I repair this?
  2. Direct C51

    Viking Dragonfly MKII "Quick Build" - SOLD

    It's time I put some real effort in to selling my Dragonfly project. I purchased this aircraft a couple years ago with the intent to finish it after I completed my Sonex. After a move to San Diego, and some changes to my hangar situation, I just do not have time to work on this project. All...
  3. Direct C51

    Light Sound Deadening Material

    Does anyone have any suggestions for a lightweight sound deadening material? My Sonex tail is a megaphone, amplifying the engine sounds and oil canning right back in to my head. The area behind my head is triangular shaped, with sides about 35". I will most likely affix the sound deadening...
  4. Direct C51

    Viking Dragonfly MKII Project - $3,500 OBO

    I purchased this aircraft a couple years ago with the intent to finish it after I completed my Sonex. After a move to San Diego, and some changes to my hangar situation, I am looking to sell my Dragonfly project. All major layups have been completed by a true craftsman. The fiberglass work is...
  5. Direct C51

    Intake Design Change Results

    It appears my previous thread on the topic went from how to modify an intake for better mixture distribution to a debate about EFI and batteries. So, here is what I did and the results. Below you will see the original (standard) intake design and how I modified it. The intake "plenum" before...
  6. Direct C51

    Help With Intake Design

    I'm having some problems with mixture distribution that I believe is caused by my intake design. The intake is a short (less than 2") straight section bolted to the carburetor that Y's to intake tubes to each head. At throttle positions between about 65% - just prior to WOT, one bank runs much...
  7. Direct C51

    Help in Diagnosing Strange Engine Operation

    To get to the point, I have a Corvair powered Sonex with about 10 hours on it. I have spent a good portion of those 10 hours diagnosing a rough running condition and am hoping I can get the collective input of the crowd here and maybe we can stumble upon something I haven't thought of. Engine...
  8. Direct C51

    BirdGlider - The Newest Airchair?

    I've been following the Sandlin Goat for awhile now, with the plan to get one built in the near future. It looks like a very similar ultralight glider, or "airchair", has been designed by the guys over at Nest of Dragons called the BirdGlider. I've been following the BirdGlider in development...
  9. Direct C51

    Carburetor Theory

    I understand the basics of how a carburetor works, but in troubleshooting a problem I am having, I have come across differing opinions. #1 If a carburetor is correctly jetted, what would happen if the inlet was not big enough? #2 Conversely, if a carburetor is jetted correctly, can ram air...
  10. Direct C51

    Advice on Engineering Degree

    There are a lot of engineers around here, and I'm hoping to call on the community to give a bit of advice. Now that I am done building my Sonex, I have time to make use of my GI Bill. I work as an EMS helicopter pilot, so my schedule allows for a lot of free time to get a degree online, but I...
  11. Direct C51

    Cooling Drag Reduction vs Horsepower Gain

    As I am designing my intake, a thought has crossed my mind that I'm hoping to discuss. My plan is a conventional pitot style intake 2.25", with a divergent airbox using a large filter full time. My cooling inlets are 4.5 inch beveled rings with a rectangular exit for cooling air. The factory...
  12. Direct C51

    Sealing a Piano Hinge / Alternate Hinging

    I am fabricating my engine cowl and am trying to visualize a solution to a large hinged cowl door. The standard is an exposed piano hinge like a Piper Cherokee, but I would imagine this will create some drag, as well as leakage through the gaps in the piano hinge. This hinge line is in the high...
  13. Direct C51

    Sandlin Goat or Similar

    I have been seriously considering a cheap, easy to build, self launching, ultralight glider for awhile now. Every time I search for what I want to build, I always tend to come back to the Sandlin Goat. My requirements are as follows. - Part 103 legal. - 3 axis stick and rudder control. -...
  14. Direct C51

    What Should I Build?

    After 11 years in the Army, I am moving on, and will finally have some spare time to build an airplane. I think I know what I want to build, but I want to make sure I haven't missed any particular airplanes that might better fit my mission. The following is what I am looking for, in order of...
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