Activity Stream

Activity Stream

  1. Turbo added a post in a topic Pitot tube attachment   

    For what it's worth, the Pitot tube probe head need not be very far below the wing's lower surface.  It just has to be clear of the viscous boundary layer of the wing's lower surface.  This is typically very thin, like a few hundredths of an inch, unless, of course, the flow under there is separated (not too likely!).  It senses the total pressure, i.e. the sum of static pressure and ram, impact, or dynamic pressure.  The total pressure is totally unaffected by the static pressure field around the wing - as long as it's clear of the viscous boundary layer around the wing at that location.  The total pressure is very easy to measure correctly, as the probe can even be misaligned by, say, 10 degrees, and the total pressure error will be less than 1%.  Align the probe tip parallel to the aircraft centerline and parallel with the wing's lower surface at the probe tip location, and you're good to go.  I say all this since a large standoff increases the chances of the probe being damaged.  The IAS is reckoned from the difference between total and static pressure.
    The real airspeed error comes from the static pressure measurement, which is fiendishly difficult to get right.  What do they do on our airplanes?  Just leave the static port on the ASI open to the cockpit pressure, and live with the very systematic error.  We could calibrate out this error if we could get a good static pressure.  Static pressure is influenced by the airplane's presence, so getting a good one involves  putting the static pressure probe sufficiently far away to zero those effects, and somehow nulling out the AOA & yaw effects.
    -Turbo, reired Boeing aerodynamicist and former associate professor of aerospace engineering, Avid C owner
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  2. Browning added a post in a topic Kitfox 1 aka "Foxy Brown"   

    I'm defiantly interested in your prop north Idaho. I will let you know once out figure out what direction I'm headed. Being here in Utah I think I'm going to need a serious climb prop. No cruising here. 
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  3. Browning added a post in a topic Kitfox 1 aka "Foxy Brown"   

  4. marksires added a post in a topic kitfox 4 with 582 flying   

    The artificial horizon is a Garmin G-5
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  5. wypaul added a post in a topic Flaperon repair jig, jury strut fairing   

    Ok, thanks for your comment. The issue that you bring up is valid and with that said we have the main struts totally covered with wood and fabric, the fuselage and wings are also covered.  I guess that if I lived near salt air and/or flying off floats I would be more concerned but where I live and fly the climate is very dry.  Also I have no problem drilling out rivets for inspection.  Once again I sincerely  thank you for your concern and comments.
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  6. Av8r3400 added a post in a topic 100 horses in a 4 cylinder with fuel injection. Antique   

    Wouldn't be my first choice to trust anybody's life with, a 80 year old two-stroke, with no parts availability, designed to fly a gunnery target - ONCE.
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  7. 1avidflyer added a post in a topic kitfox 4 with 582 flying   

    Thanks for posting the video Mark.  Who makes the instrument in the center of your panel with the artificial horizon on it?  What can you tell me about it.  Also curious about the reserve lift indicator.  What are your thoughts on it?  JImChuk
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  8. NorthIdahoAvidflyer added a post in a topic Kitfox 1 aka "Foxy Brown"   

    One blade should not be smaller on the end than the other. If you are looking for another prop I have a GSC three blade 64" with LE protection I'll make you a good deal on. I got a smoking deal on a Warp so I bought it.
     
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  9. tcj added a post in a topic kitfox 4 with 582 flying   

    Thanks for posting that Mark.  I really enjoyed seeing the upgrades you have made in the airplane.  Watching the angle of attack on approach was especially interesting to me.
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  10. Allen Sutphin added a post in a topic Engine   

    Yes, but not as much as before. Too many irons in the fire. He went to Sebring Monday for the LSA show. He has a couple of good people working for him now. He now owns Stewart Systems, plus has a repair shop #2 in the Midwest.  But still has time to answer any questions one would have.
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  11. 1avidflyer added a post in a topic Kitfox 1 aka "Foxy Brown"   

  12. NorthIdahoAvidflyer added a post in a topic Best ground loop explanation I've seen   

    I had mine after 43 hours. I would not say I was cocky but more complacent. I was coming back from my longest cross country trip. I was tired and in a hurry to get home for a dinner engagement with my wife. I listened to AWOS at my home airport and it reported 23 @ 7. We have a 24 runway so i decided to use it. When I started monitoring the airport frequency the traffic was using 20. Instead of landing on 24 like I had planned I decided to land 20 with the other traffic. When I tuned final I was directly into the sun. I flared to high and sat down crossed up. I could not see but thought I could make it work. The next thing I remember was seeing the yellow center line out my left door. I over corrected with left rudder and was stabbing in left rudder to fix that when the tailwheel broke loose. The good thing was I had slowed the plane down a lot. As I felt it going around I leaned right and dove right aileron into the turn. She stayed on her feet and did a beautiful spin clear around on the runway. I sat there thinking "God I hope no one saw that". I looked across the taxiway and there stood the fuel truck driver with a big smile on his face. Asshole...... 
    What did I learn. Runway 24 would have kept me out of the sun, would have gave me less of a crosswind component and would have put me closer to my hangar. As soon as I turned final I told myself that I should go around and use 24....I didn't listen.  Fly the plan, go around if it does not feel right, stack the odds in your favor as much as possible when flying a short coupled TB and stay in control of the plane.  
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  13. akflyer added a post in a topic kitfox 4 with 582 flying   

    That is a good point.  Have you checked the tach against a tiny tach?   That analog tac is NORTORIOUS for being way off.  Your fuel burn is quite a bit more than mine too on take off.  Or have you calibrated the fuel flow meter?

     
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  14. Yamma-Fox added a post in a topic Best ground loop explanation I've seen   

    Got two on my first day of TW training!  
    Tailwheel caster and springs were rigged REALLY bad.... something anyone with some experience could handle,  but not me on the first day!  Got that (and my mind) set right and pressed on.
    10 years later and waiting for the next opportunity to have my ass handed to me again LOL!
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  15. TJay added a post in a topic Engine   

    does Andy still run the show over there?
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  16. TJay added a post in a topic Kitfox 1 aka "Foxy Brown"   

    For tubing i used 1/4 blue air line from the tool depot works great
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  17. TJay added a post in a topic kitfox 4 with 582 flying   

    You do quite well with the helmet cam. Most I cant even watch but you stay nice and steady so nice work.
    And just to stir the pot a bit I see you pointing at your rpm and air speed ha. my Jabiru runs half those RPM at that speed hahaha  
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  18. akflyer added a post in a topic Starting my Homemade Hackman   

    https://www.ebay.com/i/163206690047?chn=ps
     
    The M6x1 fittings.  They have them on amazon too.  Have that and some 3/16" tygon tubing in my cart.  Gonna make Bob add this to the 670 before I fly his mod 4 again so I can start off on the rich side and dial it down as needed to help the EGT's

     
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  19. akflyer added a post in a topic Kitfox 1 aka "Foxy Brown"   

    if it starts lumping up, you can put the cans in some hot water and it will soften up and you can mix it right up and it will smooth right back out again.  Let it cool before you try to mix the 2 parts together though unless you want it to set a lot faster!

     
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  20. Allen Sutphin added a post in a topic Engine   

    Oil injection has been used on outboards for years and most 582's use oil injection. But it has to be set up properly. No proof exist (yet) that oil injection causes any kind of bearing wear or failure. Just my opinion and I haven't used it. Would be hard to prove that it causes any problems anyhow.
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  21. Dusty added a post in a topic Engine   

    Rotax have put a lot of thought into their oil injection system (ever noticed the little casting bump in the intake!)it works real well.  We had an issue with one of the club planes with premature wear,the oil injection was immediately blamed. The crank was replaced and This time the oil setup was checked,yup 100:1 AVEREGE oil mix!!!! . PLEASE all 582 owners check the oil is being delivered in the correct quantity (70:1 is good) these engines are incredibly reliable if set up and treated well.
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  22. sioux201 added a post in a topic TD main gears needed   

     I've got a set, I'll get some pictures and get back to you 
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  23. Buckchop added a post in a topic Sealer used for fuel fittings ect.   

    I get it at NAPA

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  24. zadwit added a post in a topic kitfox 4 with 582 flying   

    I wrapped the muffler can and hot air outlet hose nd the inlet stack with HD tin foil and used safety wire to secure it.... I will probably remove the tin foil this summer when it warms up....but every little bit make a difference...
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  25. Matthewtanner added a post in a topic Tire comparison 8.00-8.50's   

    So there is a possibility I loose some weight!!! I’m gonna try and see if I can go tubeless but I don’t know what kind of wheels I have, been trying to get everything else fixed before I spend money on silly things
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