bcbushcaddy

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Everything posted by bcbushcaddy

  1. bcbushcaddy added a topic in Close Call's and dumb stunts   

    Carb Heat Box Failure
    Hello everyone, 
    Just a quick heads up that while flying with a student yesterday in his PA-17 powered by a C-85 I had a partial engine failure in the circuit. We were working on runway changes so at time of the failure a bit further out on downwind as usual and unable to return to the pavement, safety concerns with houses, power lines, highways etc. 
    Anyhow, as I showed him once more pre-landing power reduction by pulling carb heat prior to throttle reduction the engine nearly died. Also the carb heat cable came out slightly further as it used to. I immediately pushed the nose down a bit, pushed the carb heat back in - no change 500 - 700 rpm rough at best. Reduce speed to best glide, look out below, check fuel, 3/4 tank, fuel valve on, bla bla bla ..while slowly sinking towards unfriendly terrain below. At this point I started cycling the engine and after several cycles it seemed to stabilize at about 1900 - 2000 rpm, ..time to look for a landing site, open terrain below and possibly nurse it back to the airport. No luck, can't maintain altitude so out over a small valley we go to get additional heights in the sinking game. It is also fairly open and has a few frozen ponds (barely frozen) in it that can be used as a last resort scenario. But no power lines, roads, houses, and if needed a bit of room to select the best bad place there is, since there really is no good ones. 
    Knowing of an old airstrip in the area and realizing that going back to CZML was a no go we decided to use the old field. It has some fairly tall trees at the approach and a new fence (hard to see near dusk) about 1/3 down, ..never mind its all we got. Over the trees we go, lean it over into a nice slip towards the fence, level off, flare, touch down, roll out, full brakes, watch the ditch, big rock, bull wallows and and we come to halt, ..best of all right side up and not a scratch on the plane. 
    After shut down and inspection I put my fingers up the hot air bleed hole of the box and immediately could feel the butterfly valve laying on the bottom of the box. Upon removing the filter it was rather obvious that some really poor workmanship was to blame and a secondary, possible 3rd repair and brazing failed - see photos. It partially occluded the intake and reduced the amount of air needed for the engine to run properly.
    So if anyone is using an old carb heat box, they are now 60 years old, things fail, don't be afraid to check it good on your next annual. Look at the welds!! Anytime you pull that filter, give that Butterfly Valve a good hands on wiggle, not just a visual. Ideally spend a couple hundred bucks for a new one and get a peace of mind with it.  And also, anyone telling you that certified engines are better than your Rotax, Subaru or Yamaha, because they never fail, ..I beg to differ. Certified Aircraft engines have problems too and I could go on for some time listing issues here. But the point here is, that a look is good, a hands on wiggle better and new box ideal. So for all those on this forum or maybe your friends that are bombing around with an old C-65, 75, 85, 90 you name it, ..maybe check that old airbox and the welds. Was a first for us, but there is lots of them out there. Stay safe! 


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  2. bcbushcaddy added a post in a topic Yamaha RX1 Engines   

    REALLY?! I've been following this threat with great interest as I had the opportunity to see Willis' (Marshawk) Yamaha Conversion come to live with Teal's help. I don't have a re-drive or Yamaha yet, ..but don't think it will ever be bearing a Mohawk sticker.  Just my .02 cents! ;-) 
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  3. bcbushcaddy added a post in a topic Subaru EA81   

    Thanks EDMO, it is actually good input as it leads to yet another discussion and thats on the benefit of the lower bearing. My first ever Johnson re-drive built from plans and parts also did not have the lower bearing, nor did several other belt drive systems such as Stratus or even Raven if I remember correctly. The biggest problem for me is the paint job, looks good but really bugs me for tolerance and ability to trust the torque settings over time. Next, and I will have to check that yet, is to micrometer the Subaru Crankshaft Flange and possible "runout" into the shaft end inside the front bearing. Let's just say that the tolerances used in the machining of the drive (way back when, 80's, 90's) are not quite CNC and what one might expect of being made today. And it's experimental and there should be a certain expectation that it will work but might need some fine tuning. And there is the fact they were built as a one of at the time and there is installation variations from builder to builder no doubt. Anyhow front the shaft has been sleeved, going to post some photos next time and hopefully some more info on the runout issue if there is any. 
    Thanks again EDMO, ...hang in there! With best wishes, 
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  4. bcbushcaddy added a post in a topic Subaru EA81   

    How many guys who read this forum are flying a EA81 with a Dave Johnson "Reductions" drive and what is your experience with it? Seems like mine has a few machining issues which showed up in pre-mature wear (14hrs TTE) on the lower shaft - Front Crank Bearing. My lower front plate (housing) had a hump left from cutting/milling and it loaded the lower front bearing/shaft. I'm getting my plate milled and the shaft having a steel sleeve/collar placed where it slides into the bearing as the 6061T6 is simply to soft it seems to take the load. Notice the space in the enclosed photos below. While it all fit on assembly, the bottom plate was a tight fit and I believe it caused a minor misalignment of the shaft and initiated the wear. As I understand from other forums and users of the Johnson Drive, I'm not alone in this. Hence my question here!
    Not looking for keyboard opinions but solid EA81 user/flyer feedback! Thanks, Willy T.  


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  5. bcbushcaddy added a post in a topic Carb Heat on EA81 Holley/Weber set up   

    Couple of photos from the new manifold, Holley-Weber Carb and Carb heat system. Working with a manual choke and only needing 2psi initial start ups were absolutely the easiest ever and the engine ran smooth. Thus far I adjusted only the idle set screw and I have done several more starts and short runs. No flights yet, since my Johnson Re-Drive is not happy, ..therefore I'm not happy.  Getting noise (stethoscope) from all three bearings and a severe clicking by hand-pulling the prop from the rear main bearing. More to follow. 



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  6. bcbushcaddy added a post in a topic Recommended bungee for a fat plane?   

    Regular hardware store bungee cord is not advised as it is simply too flexible. Bungee's ie. shock cords comes in all different patches, sizes, flex, you name it and sourcing it consistently is at time a bit of a task. I fully agree with using Aircraft Spruce as a trusted supplier or you can sweet talk the good folks at Kitfox and order a set for your Kitfox4-1200  ;-) or 5 project. Just to show you that this is not an uncommon issue here is a somewhat dated PDF. I'm sure Avid in its days went through similar problems. And these problems still exist today but as "Red Green" would say, ..remember, we're all in this together! 
    http://www.kitfoxaircraft.com/images/serviceletters/SL-20.pdf
     
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  7. bcbushcaddy added a post in a topic Where can I get this thermostat?   

    Try www.ipsco.org  you might find something suitable there. 
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  8. bcbushcaddy added a post in a topic Subaru E81 head needed   

    ..let me check with Willis (Marshawk) but I think there might be one around if you cant find anything closer. 
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  9. bcbushcaddy added a post in a topic Carb Heat on EA81 Holley/Weber set up   

    Thanks EDMO, got the block organized and the problem with the car intake filter housings it their size. Just don't want to re-invent the wheel here if someone has already a good and working set up. 
    TJay, I (we, Marshawk included) had some issues with the regulator needle valve and seat where fuel would bypass and drown/fuel lock the engine. The newer version has gone to a flat and grooved O-ring vs the older conical/floating O-ring style. Part of this problem was a (new) worn leaking main fuel shut off valve. I've been back and forth with Paul at Rotec on this matter and finally pulled it off to be shipped out for a service/upgrade in Australia. Customs decided they liked it and are still hangin on to it after 6 weeks. I like the TBI but it will not go back onto my Subie.  It will most likely end up on the Corvair, ..if it ever gets back that is. When those TBI's are tuned right they do run great, but make  sure you have the latest or upgraded version. And if you ship anything to the land of AUS make sure the value declared is under 1000.- At this point I'm in the wait and see mode here and even if it comes back I'm not quite ready to give up on it yet. Maybe I'm just to stubborn :-) 
    Despite what you might read about Rotec, my experience with them has been very good. 
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  10. bcbushcaddy added a topic in 4-strokes   

    Carb Heat on EA81 Holley/Weber set up
    Hello, 
    Switching from the Rotec TBI 40 to a Holley/Weber on my EA81. ANYONE got some good photos of a working/flying set up? Thanks! 
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  11. bcbushcaddy added a post in a topic Carb ice on a Stratus Soob with Bing carbs   

    I can certainly attest to the fact that the EA81 Subaru will produce Carb Ice with a Rotec TBI 40 even given the stock water-cooled (heated) manifold. And YES there is a longer story to this but that one might need to go into the Dumb File folder in time. 
    My general feeling, ..if hasn't yet, it doesn't mean it never will. 
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  12. bcbushcaddy added a post in a topic Ridge Runner 3S   

    Looking for a picture on the rear pilot rudder pedal installation. Little stumped by the all the parts and how they are supposed to fit. Thanks! 
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  13. bcbushcaddy added a topic in "other aircraft your working on"   

    Ridge Runner 3S
    Any builders, owners or active flyers of RR3S on this forum? 
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  14. bcbushcaddy added a post in a topic 503 Motor plate   

    Hi Gunderson, 
    I am looking for a plate for the Ridge Runner 3 and think yours might be a close fit. However, measuring my engine mount holes C->C I get 6"7/8 and 8"7/8 respectively. And I need to take a look at the starter configuration on the 503. I'll get back to you, if it looks like its the one. 
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  15. bcbushcaddy added a post in a topic VGs? Who has them and do you like them?   

    Hello Maddin, 
    This is a 2 person job, so bring a helper.
    Place a Drywall square/Carpentry Square (with extension) on the bottom of the wing (long side) and up tight against the leading edge (short side). Measure parallel to the bottom edge the proper distance. If I recall the VG placement is 8% - 12% (?) of cord, in your case 8.3cm to the front edge of the front VG's and 12.5cm to the rear edge of the rear VG's. That's how we placed them on the Kitfox 4.
    String 2 lines, use black sewing thread and tape in place. Make sure you do this inside and the string is very tight. Place your VG's in the proper Guide Paper and alternate every 4 VG's. Dont be afraid to press down on the VG's when you glue them and make sure its not too cold out either. 
    Do a test flight prior and note your temperature, speeds, rpm's, climb rates, etc. Place the wing VG's first and fly the aircraft and note the new parameters. We are looking forward to the report. Tails section VG's; Describe the problem and why to you need them? I remain fully convinced on the 701 Tail VG's but dont think the Kitfox 4 needs them. Like mentioned in a previous post, it all comes down to CofG, Center of Lift on the wing, load distribution, engine weights, H-stabilizer settings, and the list goes on. In either case only do one upgrade at the time and note the differences. 
    If you have any doubt with the enclosed please refer back to the original VG instructions for your aircraft, as "staggering" is an unproven installation of VG's. We can only second the experience as encountered by a previous Kitfox 4 owner for the staggered installation and neither discourage nor encourage any such attempts on similar or different airfoils/aircraft.   
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  16. bcbushcaddy added a post in a topic Yamaha RX1 Engines   

    Subject to temperature the manual says 15 minutes between the Poly-Brush and Morning to Afternoon for the silver Poly-Spray. Best I could find...
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  17. bcbushcaddy added a post in a topic VGs? Who has them and do you like them?   

    Hi Guys, 
    We have installed about six sets of VG's with varying results. I agree wholeheartedly with the statement ...it depends what you are looking for. PLACEMENT: Last set went onto a Kitfox 4 in a Stagger Fashion and it yielded the best improvements yet. Photos and a little write up in the KF4 section of this forum. Thinking why they worked better in stagger is probably the fact that 50% are fore and the other 50% are aft, hence as the wing angles the effect is in a broader range of effectiveness. Just my guess, but about the only way I can explain the stagger findings (1) vs the straight (5) installations. 
     I'd be tempted on the next set to go with the stagger again, this time put the front edge of the VG near the front% of cord and the tail edge of the rear ones near the aft% of cord as recommended. Flaperons don't count as part of the wing. Last I looked they seemed like control surfaces to me. 
    Lessons learned; Unless someone has the pretty much the exact same bird, W&B, rigged the same the results will vary from plane to plane even on the same type, model. That much we figured by now. Looking forward to hear about your findings...
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  18. bcbushcaddy added a topic in Avidfoxflyers General Hangar   

    Congratulations Scott!
    Proud to announce that there is another bonafide "Kitfox - Flyer" amongst the crowd. Scott P. completed his Canadian ULPP here recently with us and is the proud owner of this beautiful Kitfox 4-1200.
    After a few years absence from giving instructions/training in a Kitfox I almost (..NOT!!) forgot how much fun they are. 
    Safe Journey's Scott and post a few cool landing sites from the northern Rockies!  

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  19. bcbushcaddy added a post in a topic STOLspeed VG's on Kifox 4 - 1200   

    Here is another link to the instructions that we used. Didn't bring a drywall square that would have been real handy on the bottom of the wing. Saved by the iPhone but almost turned into a 2 person 5 handed job to get exact to the mm. 
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  20. bcbushcaddy added a topic in Kitfox IV   

    STOLspeed VG's on Kifox 4 - 1200
    Hello all, 
    Just installed some STOLspeed VG's on a Kitfox 4 - 1200 powered by a 912UL and here are some non-scientific numbers that we noted. This is the 4th or 5th set of STOLspeed VG's that we have installed on various aircraft, all with slightly different results, all with mainly positive results. First off, on this one we did the staggered installation which was new to us but since it was tried before we felt lets run with it, especially since it is listed on the STOLspeed webpage under Kitfox. We went as close as possible with the installation instructions as provided on the webpage and here is what changed; All test's flown dual occupancy, app. half fuel at 3000' ASL runway and 4000' ASL circuit elevation, standard day.
    Climb increase 200'/min from 500' to 700'        Cruise increase 3 to 5 mph     approach speed drop (solid feel) by almost 10mph  - unable to power off stall the aircraft with stick all the way back from cruise flight configuration, merely nose nodding at below 40mph through a 5mph up and down motion. WOW!!!    
    ...and than we put on the Horizontal Stabilizer VG's at 30mm intervals and taped the hinge. 
    Lets just say that there was a speed drop in cruise, a heavier feel to the aft stick once flaps are set untrimmed and little to no "positive" change in flare, except maybe a bit of over flare if you were not ever so gentle in your round out and/or deceleration phase. Not sure if I like them or not. Felt good without them and in my opinion taping the hinge, if you really must, probably is all you need. I'd take the faster cruise speed over an over flare on landing, thank you very much, all I am looking for is a nice three point attitude that is holding right until touch down. Maybe a 60mm spacing might be better, in either case more testing is needed. Maybe with a heavier engine up front like a Subie or big Jabi, they may make a bit more difference, but with the 80hp Rotax and the Moment Arm at 12.32 I don't feel they are that much an improvement. Just our experience and two bits. 
     
     


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  21. bcbushcaddy added a post in a topic Avid MK4 Wing Strut Inspection   

    Let me elaborate a little to Willis' post...
    There was no obvious signs of any corrosion other than a few small specks around the very top and Jury strut brackets while they were sealed in the fabric. It was the slight separation of the wood (and a hunch) that lead to this inspection. There was also no discolouration of the fabric on the outside. However there is discolouration present in the wood, see center photo, for almost 2' down the tube. There is little rust on the top covered 1" where it is able to dry out, through the crack, mind you. The issue arises further down where the water collects and remains for periods of time. The top 2' of the wood filler was no longer "glued" to the strut but had separated with copious amounts of rust. Punch tests along the rear center line in 1" increments did not lead to any protrusions, ...as of yet! Not sure how much longer the tooth of time could gnaw away before failures would occur? 
    I have just checked the Kitfox's webpage for SB's  http://www.kitfoxaircraft.com/index.php/service-bulletin  but could not find any. Maybe I've missed it or possibly misread it? Needless to say AVID will no longer issue any, so it is up to the community to raise the awareness to this fact. I am certain that your garage kept aircraft in Tonopah NV will most likely be fine, but I am also certain that your parked/tied down Vancouver Island bird will show the same thing. Well, how much rust is reasonable? I don't want to answer that one, but how about none as a start to the conversation. 
    In either case I highly recommend an inspection, some of these aircrafts are now 30 - 40 years old and having looked at a lot of PA-18s, 20's, 22's Citabria's and you name it, it's not uncommon to find hidden rust. The ultimate call is yours as the owner, pilot and mechanic. 
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  22. bcbushcaddy added a post in a topic Avid MK4 Wing Strut Inspection   

    BIG THANKS for the heads up on the structural integrity! I guess we'll be exploring a few "strutting" options on this one. Don't see the point on re-doing it the same way. Certainly going to have to take a look a Leni's upgrades. 
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  23. bcbushcaddy added a post in a topic Avid MK4 Wing Strut Inspection   

    Thanks for the enclosed info. I guess we better take a peek...
    Stay tuned! 
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  24. bcbushcaddy added a post in a topic Subaru EA81   

    OOPS - dont return the cooling line (right hand side) into the Thermo-Switch port as this will only give you half the radiator. Use both outlets and cap the Switch Port or alternately use it in conjunction with a radiator fan.  
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  25. bcbushcaddy added a topic in 4-strokes   

    Subaru EA81
    Hello all, 
    Not sure if I am posting this twice - just lost my sat momentarily and killed the previous post. In either case here it is again. Couple of pics below of our Subaru EA81 engine and re-drive set up. Only started flying it so too early for me to answer to many specific questions but this is what was done to the engine to modify it. Stratus profiled Cam (no longer available as far as I know, but use local engine shop), higher compression, flowed heads (flow charts to follow), stock ignition, 38 amp after-market alternator, VW Jetta radiator with stock pump and pulley regulated by 16psi cap with 190F thermostat; 
    cooling works well, PCV return (right side of re-drive) line will be changed up slightly, air filter - may go bigger, wondering if it leans me a bit too much at high power settings?, electrics - simple is good and same for ignition, points are cheap..., TBI-40 works well, but it is finicki in downdraft mode,  ...and a little glimpse of the other side of the firewall. We will try to post a few more inputs as we get them over the next little while testing this set up here. If you have questions of a similar installation with the TBI, but gear driven than Willis (Marshawk) can probably give you more feedback than "moi", ..as I am only getting started flying it and testing it. 





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