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  1. 1avidflyer


    Don't really have an answer for you John, but I suppose it has something to do with getting  good and equal fuel distribution between the cylinders.  We both know how with the Jabiru, EGTs can easily be 100 degrees different from one cylinder to the next.  Tilting the carb to try to even things out and such.  If they could have done it well enough with one carb, I'm sure Rotax would have.  I don't really have any experience with the 912s though.  I do have one on a test stand that I'm going to try to fire up today though.  If I can get my butt off this computer that is.... :-)  JIMChuk

  2. skypics


    Turbo:

    My MK4 was painted with butyrate circa 1996. When I bought it in 2016 I could see that the paint was cracked in many places. 

    I had it stripped and repainted with Ranthane for a princely sum of $6K. It looks great and I swear it actually seems to have a bit higher TAS.

    I have already had some fabric damage when one of my right MATCO brake pucks stuck and took me off the runway and up on the nose and left wing bending the axel, breaking one of the Whirlwind prop blades and damaging left wing tip including the outboard flaperon hangar.

    I was going to report it to  AVEMCO, but decided the the $1K deductable would be half of what the estimated repair cost would be and they would most likely raise my premium.

    Luckily I have hangar neighbors who have build aircraft who did most of the repairs including scarfing a new trailing rib section onto my outboard rib. 

    I had our local fabric guy replace the fabric and the paint shop did the repaint. 

    Total cost $2,000.

    Interesting sidebar...

    When we took the fabric off to access the damage we could see that the same thing had happened earlier in the life of the MK4, but was not indicated in the logs. So the brake puck must have caused the same thing prior.

    Keep those MATCO brake puck sliders clean.

     

    John M

     

  3. tcj


    Nice! Is that a landing strip on the ridge on the second to last photo? It looks like a clearer line there...

    Strip.thumb.JPG.b836433c163a536e8c6eff89

    I recognize that area.  I think its a wheat field.  You can zoom in on google maps.

    I'm having trouble posting a link to Google maps that works,.  I'll see if i can fix it.

    Try this https://www.google.com/maps/place/Rowena,+OR+97058/@45.6698675,-121.2934784,4696m/data=!3m1!1e3!4m5!3m4!1s0x5496197f27a0eb79:0xcc011ca5b797764d!8m2!3d45.6723426!4d-121.2684056

    The link works when I copy and paste it on my computer but it gets some strange results when I paste it into this post.  The lat and long is 45.6628, -121.2854

  4. skypics


    As a Jabiru owner, I see no mag drops most likely because the plugs are both at the top of the cylinder.

    Most of my wingmen have 912s and have all reported vibration at one time or other. Had to have the gear box worked on. 

    Two friend with Zenith 750s have carb linkage issues which give some issues with both carb throttle levers not working in sync.

    Question: Has anyone modified the 912 manifold by joining the two carb inputs so that the engine could run on one carb as the Jabiru does? Instead of the two smaller carbs used on the 912s, the larger carb, as used on the Jabiru engines coud be used. Should work on the 1600 cc Rotax since the jabiru Bing works on the 2200 cc engines. No carb syncing issues.

    Doesn't seem that hard to do and would be worth it in my opinion.

    That said, I realize there are thousands of 912s doing just fine as is.

    John M

  5. Turbo


    Hi Guys.  Just thought i'd post a few pix from my home stomping grounds - the Columbia River Gorge.  My Avid C, N23PB, is in good health, and although she's a little on the plain side, she's got the magic.  Got in about 1.2 hrs today 9/18/2018.  Overflying a friend's house I thought I'd call him on the cell.  Took off the headphones and YOW, it's way too noisy!  Oh well.  I'm getting about 80 mph indicated at 4500 rpm, low altitude.  Not bad!  - Turbo

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    5 people like this
  6. nemesisnxt


    That area looks like a hell of a lot of fun.  Just wrapped up a week at the Reno Air Races, and as much as I love seeing guys blow their hard earned money and putting their lives on the line, I think I’d rather be at a light sport/ultralight event.  

     

  7. C5Engineer


    John M. I have a 20,000 MFD capacitor on the way. The other day while flying, one of the local instructors told me that all he could hear was a "click" when I tried to transmit. I finally figures out that it was the battery pack I have been using. It's one of the type that you add alkaline batteries to. Once the batteries get so low they don't have enough deep cycle capability to maintain a transmission.

    I have one of the battery packs that has a cord running to a cigarette lighter plug. Ir works great to power the radio but they I have to put up with the whining from the engine. 

    I will take some pictures of my ground and and power buss and post them tonight. I have my 12 volt auxiliary/cigarette plug port connected right to the battery and use them to power my intercom and radio. maybe you or Chris could give me an idea on where to install this noise filter.

     

    It sucks but the power supply Icom sells will likely fix your issue. https://www.sportys.com/pilotshop/cigarette-lighter-adapter-for-icom-a24-a6-transceivers.html?utm_source=google_shopping&m=simple&mrkgcl=596&mrkgadid=3208669406&utm_medium=cpc&utm_campaign=Avionics+%26+Radios&adpos=1o2&creative=295428070003&device=c&matchtype=&network=g&gclid=EAIaIQobChMIhuH8gZbG3QIVAb7ACh3hxQLaEAQYAiABEgJkX_D_BwE

    1 person likes this
  8. Allen Sutphin


    You guys are definitely good for one's motivation!   As long as there are groups like this, older Avids and 'Foxes' will still be flying off into the sunset. I tip my hat to you!

    3 people like this
  9. MnAvidFlyer


    AVID FLYER A • $11,500 • FLY RIGHT NOW • Avid Flyer A airplane N#990MP has recently had a "Conditional Inspection" completed. Currently flown 4 hours since 9/4/18 inspection. Has a current A/W Certificate, Current W&B, Current Registration and Phase 2 Operating Limitations. Airframe 975TT Engine 229SOH. Times will rise as it is being flown. Also includes up to date airframe and engine logs. Includes maintenance docs on airframe, engine and SB's AD's. Rotax L/C 582 grey head 65HP w/C box electric start. Warp Drive 3 blade Carbon fiber prop Std hub Hyd brk. 8x6 tires. Folding wings like a Kitfox! Flys and performs Great! $11,500  • Contact Brooks Letourneau, Owner - located Farmington, MN USA • Telephone: 612-460-8487 • Posted September 18, 2018 

     

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  10. TJay


    I tried mine toe out at first didn't work.  What started to happen (on pavement) the tire was trying to pull to the outside and that would pull my gear out and compress my springs not cool.  So I set them toe in and that helps hold the gear in the full up right position.  I also figure there is give in all the pipe on my landing gear so being toe in when you start rolling your pushing against the tubing which is really setting the wheels at zero.  Remember I am only border line Genius so do what works best for you. :)

    1 person likes this
  11. Buckchop


    Well i tried to put a two short videos on with those pic but guess it not work, hahahhaaaaa should to figure that out. Mmmmmmmm

    Thanks Jim was an awesome day, and is cramped but to much fun so u forget all about that, then we took it for another short spin a few days later while Leni was still here playin in the dirt with me.  Hahhaaa

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  12. NorthIdahoAvidflyer


    John M. I have a 20,000 MFD capacitor on the way. The other day while flying, one of the local instructors told me that all he could hear was a "click" when I tried to transmit. I finally figures out that it was the battery pack I have been using. It's one of the type that you add alkaline batteries to. Once the batteries get so low they don't have enough deep cycle capability to maintain a transmission.

    I have one of the battery packs that has a cord running to a cigarette lighter plug. Ir works great to power the radio but they I have to put up with the whining from the engine. 

    I will take some pictures of my ground and and power buss and post them tonight. I have my 12 volt auxiliary/cigarette plug port connected right to the battery and use them to power my intercom and radio. maybe you or Chris could give me an idea on where to install this noise filter.

     

  13. 1avidflyer


    This just popped up on barnstormers.  To much airplane for me.... but probably a good deal for someone.  No waiting for 6 months or whatever the lead time is.  JImChuk

    KIT FOX SUPER SPORT 7 • $20,000 • AVAILABLE FOR SALE Partially assembled. Wings, tail feathers covered. Fuselage ready to be covered. Idaho. $20,000 obo • Contact Darrel L. Agenbroad, Owner - located Grand View, ID USA • Telephone: 2085985781 . 2088343077 • Posted September 18, 2018

  14. flyboy01


    Definatly don't run the blades you have.  You can't imagine how much that engine will shake if the prop is out of balance.  I hit some slush on a frozen lake one time, and it flew up into the  wood prop. A piece of the trailing edge that was maybe at the most 1/2" wide by a foot or so long and pretty thin broke off.  At a medium idle, it felt like the engine was going to shake off the front of the plane.   It's tempting to want to hear the engine run, but remember, it was running fine before the crash, and should run fine now if it wasn't damaged.  Worry about the rest of the plane for now is my advice.  Here are a couple of pictures of two different  ways to do your rib tail repair that I couldn't post on the Team Kitfox site.  If you do this repair, use the right kind of plywood.  This was for an Avid Flyer, but the Kitfox is very similar. JImChuk

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    Thanks Jim for the pics and advice, I just took the prop off and there is nooo way i'm even thinking of trying it anymore! :o 

  15. flyboy01


    Only thing doing a runout test on the flange tells you if the flange is bent. Its the gear train that gets damaged usually on the rear of the engine with the drive systems. With a gearbox, damage to the engine is usually nil. Just a minor prop strike normally just damages the prop. A sudden stoppage can do major damage to the other parts of the drive train which can run normally for a while up to failure.  Any sudden stoppage SHOULD require a teardown at the least. That's why one should use caution when buying a used 912.  An engine turning 4-5000 rpm's gets stopped suddenly, its not rocket science as to what keyway's get sheared or gear bolts get overstressed including the accessories that are bolted to the rearend.  Bad thing is, teardowns are not cheap and are usually put off till its too late or the engine is passed on to the next buyer.

    Thankfully, The owner/passenger killed the engine before impact so I would be surprised if the engine or crank was damaged, nonetheless I'm still going to check the crank with a dial indicator.