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Thread: L-21 Javron

  1. #81
    Farmboy's Avatar
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    Quote Originally Posted by avnxtek View Post
    And the harnesses came in this week

    Attachment 39227
    The entire project looks great, but I'm super happy to see your new harness. Good man.

  2. #82
    skywagon8a's Avatar
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    Quote Originally Posted by avnxtek View Post
    I realize that your still in progress. Don't forget to install a support hanger for each tail pipe back to the engine to support the tail pipe from banging on the lower cowl.
    N1PA

  3. #83
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    Quote Originally Posted by avnxtek View Post
    Well got the front seat finished up today

    Attachment 39369



    I really the look of those seats. Would be perfect in my plane...

    Keep up the good work. Gonna be a very nice Cub for sure.

  4. #84

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    Quote Originally Posted by Farmboy View Post
    The entire project looks great, but I'm super happy to see your new harness. Good man.
    They are not cheap but strapped in with them you are one with the airplane. A great feeling

    Quote Originally Posted by skywagon8a View Post
    I realize that your still in progress. Don't forget to install a support hanger for each tail pipe back to the engine to support the tail pipe from banging on the lower cowl.
    Keep an eye on me. I need it. first build right.
    You probably noticed that I haven't put any holes in the firewall yet waiting to see where things will be. Heat box won't go where it's supposed to but I think I can move it up about 4" just above where it hits the engine mount and it won't be in the way of anything. And Vetterman sends a great kit with clamps and support rods

    Quote Originally Posted by Olibuilt View Post
    I really the look of those seats. Would be perfect in my plane...

    Keep up the good work. Gonna be a very nice Cub for sure.
    Well they went together better than I thought they might. Pick up a good machine and give it a try
    very time consuming and lots of planning but all fun


    i probably won't get back to the lower cowling until the weekend (that dam work thing keeps getting in the way of all the fun). Thanks for the suggestions the wheels are turning and will probably end up with a combination of all the ideas

  5. #85
    www.SkupTech.com mike mcs repair's Avatar
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    but the veterman (clamp)kit supposed to clamp to 'engine mount'..... better to make a brace off engine it self, less vibration....

  6. #86

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    Quote Originally Posted by mike mcs repair View Post
    but the veterman (clamp)kit supposed to clamp to 'engine mount'..... better to make a brace off engine it self, less vibration....
    The Kit that was sent with my exhaust has a drawing showing a brace from the engine to the exhaust and then to the engine mount in a V. They are not a solid brace they have a rubber hose in the middle
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  7. #87
    skywagon8a's Avatar
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    Quote Originally Posted by avnxtek View Post
    .... to the exhaust and then to the engine mount in a V. They are not a solid brace they have a rubber hose in the middle
    Make certain that when you finish that there is NOT a solid connection between the exhaust pipe and the engine mount. If it is solid it WILL​ break in less time than you can imagine.
    N1PA
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  8. #88

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    More cowling fun

    A little layout and cutting
    image.jpeg

    Fabricate some Vents and a little room for exhaust

    image.jpeg

    Getting it all together

    image.jpeg
    image.jpeg

    And makeing it all fit

    image.jpeg

    image.jpeg

    image.jpeg

    image.jpeg

    I ended up up with about 3/8" between the muffler and cowl. Hope that will be enough
    I need to add a fresh air scoop for heat and a few more camlocs
    its all fun.
    Attached Images Attached Images

  9. #89

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    Just Baffling and other Firewall forward stuff

    Muffler supports to the engine only they have a little flex should work fine

    IMG_2700.JPGIMG_2705.JPG

    Started with the Vans Baffling and did some work to get more airflow around #3
    Hope that Helps keep it cool

    IMG_2696.JPGIMG_2697.JPGIMG_2698.JPG

    Next is the Oil cooler Not sure if I want it on the Baffling or mounted to the Firewall with a duct from the baffling
    Any suggestions pro's and con's
    Thanks Rvaitor9 thanked for this post

  10. #90
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    Quote Originally Posted by avnxtek View Post
    Next is the Oil cooler Not sure if I want it on the Baffling or mounted to the Firewall with a duct from the baffling
    Any suggestions pro's and con's
    I just moved mine from the baffles to the firewall (with 4” SCAT tube feeding from the #3 side) because I kept having to rebuild cracked baffles. Though I’ve seen others that haven’t cracked, but they were braced differently from mine. Looking at my old bracing, it’s likely that it contributed to the cracks by focusing the vibes to an area that was likely to crack to begin with.

    Just my limited experience.

  11. #91

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    You may need to add a seaplane lip to help with cooling so I would keep that in mind when it comes to the bottom cowling.
    DENNY
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  12. #92
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    Quote Originally Posted by DENNY View Post
    You may need to add a seaplane lip to help with cooling so I would keep that in mind when it comes to the bottom cowling.
    DENNY
    He’s got some pretty good vents on the lower cowl (post 8. If you get the top side of your cowl sealed good, I’d bet you deal more with low temps than high ones.

  13. #93
    skywagon8a's Avatar
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    Quote Originally Posted by avnxtek View Post
    IMG_2700.JPGIMG_2705.JPG


    Next is the Oil cooler Not sure if I want it on the Baffling or mounted to the Firewall with a duct from the baffling
    Any suggestions pro's and con's
    What are those rubber hoses on the exhaust supports? Are they joining two pieces acting like a flexible connector? If so,good.

    If you mount the oil cooler on the baffle be certain that you have substantial reinforcement to support and tie the weight of the cooler to a solid location on the engine such as the threaded holes on the cylinder head which are for the baffle screws. This support should also carry over to the crankcase. There is a 1/4" hole near the upper engine mount which is good for this.
    N1PA

  14. #94

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    [QUOTE=skywagon8a;737928]What are those rubber hoses on the exhaust supports? Are they joining two pieces acting like a flexible connector? If so,good.

    Exactly.
    3/8 stainless tubing with 2.5" of hose. holds good and gives some dampening
    im thinking the oil cooler will mount to the firewall with a support to the engine mount.
    Still looking for ideas for this one.

  15. #95

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    Wouldn't solid support back to the engine be better? Those "dampers" will allow flex. With enough flex cycles something will crack and break. Wouldn't the exhaust and engine being tied together as one unit be preferred?
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  16. #96

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    Kind of hard to tell from the pictures but the vents look to me to be more pockets for the exhaust. The actual open vent area looks small compared to a reg lower cowling.
    DENNY

  17. #97
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    Quote Originally Posted by stewartb View Post
    Wouldn't solid support back to the engine be better? Those "dampers" will allow flex. With enough flex cycles something will crack and break. Wouldn't the exhaust and engine being tied together as one unit be preferred?
    It has ball joints forward of the mufflers to allow flex and prevent cracking. That is how RVs and is how I have been doing Maules to keep from cracking the exhaust from the long arm hanging out there. Actually works very well. I have used rubber muffler strapping from the firewall as well.
    Steve Pierce

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  18. #98

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    Interesting. I'll look at mine tonight. My muffler hangar is rock solid and are more in line to support the weight against gravity. Works perfectly.

    The dampers mounted at approx 90* from each other will pretty much cancel out any flex but how effective are they at supporting the weight? As Mike would say.... pre-flight item.
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  19. #99

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    I went with this muffler support because this is what Vetterman sent with the exhaust. They do hold the mufflers solid.
    I used aero quip hose and a clamptite tool to hold them in place. Don't think they will come off.
    We will see and I'll keep an eye on them.

  20. #100
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    I have seen them break the tabs bolted to the engine.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  21. #101
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    Quote Originally Posted by stewartb View Post
    Wouldn't solid support back to the engine be better? Those "dampers" will allow flex. With enough flex cycles something will crack and break. Wouldn't the exhaust and engine being tied together as one unit be preferred?
    If the supports in the above picture were solid, it would be necessary for the clamps where they attach to the tail pipe to be a loose slip fit. If not, the stresses when the pipes heat up and are shaken will break the end of the support tube or some other component where it is attached. There needs to be a place for motion even if it is only the clamp being able to slide on the tailpipe.
    N1PA

  22. #102

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    It makes no sense to me. I want my entire exhaust to be anchored to the engine so the entire engine-exhaust system moves at the same rate and time. If the tailpipes aren't in synch with the flanges at the engine something in between will flex, and that doesn't end well. As for the "ball joint" at the mufflers? Mine don't appear to give. I assumed the purpose was to allow some change in angle from collector to muffler, as opposed to having a welded flange. I have a hard time believing it's engineered to move, but what do I know? I found the muffler hangers interesting, and having just dealt with mine a few days ago the assembly is fresh in my mind.

    I didn't mean to criticize the topic project. It looks great.
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  23. #103
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    If the pipes are short they are connected to the engine via a flexible attachment and if the pipes are further aft the angles don't work for attaching to the engine so they go to the airframe like Maules do. The RV guys have it figured out. I am sure it is like everything where one way doesn't work for everyone but works for some.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  24. #104

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    Avnxtek, the cowl support rods that you have attached to the motor mount, where did you find the aluminum blocks mounted on the motor mount? They look much better than the piper clamp that most use. Good looking work, I also had to put a blister on my cowling to allow room for the Vetterman exhaust, my cowl is carbon fiber so a little easier to form. Thanks

  25. #105
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    The ball joints should give, sounds like you have the bolts to tight, there are suppose to be springs with the 3/16 bolts and there is a measurement that came with mine for how tight it should be. Never seen an exhaust that did not break with time if it can not flex
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  26. #106
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    Guys in the Acro community have learned through experience (and high G’s) To hang directly to engine with no hangers. Course you also have finger straps added to flanges.Like Greg said, They all are very high maintenance. My RV-4 has hanger style. Has been trouble free for alota hours.
    FEAR IS A REACTION, COURAGE IS A DECISION

  27. #107

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    Quote Originally Posted by planenuts View Post
    Avnxtek, the cowl support rods that you have attached to the motor mount, where did you find the aluminum blocks mounted on the motor mount? They look much better than the piper clamp that most use. Good looking work, I also had to put a blister on my cowling to allow room for the Vetterman exhaust, my cowl is carbon fiber so a little easier to form. Thanks

    I couldn't find anything i liked so I had to make them myself. Experimental aircraft are so much fun

  28. #108
    Tony flyrite's Avatar
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    Quote Originally Posted by Steve Pierce View Post
    I have seen them break the tabs bolted to the engine.


    This is what we do to avoid that ...Finger straps on my buddies Bearhawk

    6E7D57F8-B309-4795-B3AB-5553438638CD.jpg
    Last edited by flyrite; 01-25-2019 at 05:25 PM.
    FEAR IS A REACTION, COURAGE IS A DECISION
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  29. #109

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    Quote Originally Posted by DENNY View Post
    Kind of hard to tell from the pictures but the vents look to me to be more pockets for the exhaust. The actual open vent area looks small compared to a reg lower cowling.
    DENNY
    They were made to give clearance for the mufflers more than anything. they are small for a cowling vent I think they look better than a pocket for clearance and will help some. Once I get everything in place I'll probably work on a seaplane lip also
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  30. #110
    skywagon8a's Avatar
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    Quote Originally Posted by avnxtek View Post
    Is this for carb heat? If so, if you find that you need more heat you could close up that opening considerably.
    N1PA

  31. #111

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    Just about have this Baffling done
    I have the Baffling around the flywheel to go yet. I see some use it and some don't any opinions on that?
    I'll wait on the seal until the final install

    IMG_2749.JPG

    IMG_2745.JPG

    Oil Cooler went to the Firewall I'm waiting on some flanges to come in to finish that up

    IMG_2750.JPG

    Been working on the Throttle levers for a long time now Finally got them done
    the bracket holding the cable is just a temp

    IMG_2751.jpg

    IMG_2752.jpg

    Hope to get this Firewall forward done so I can start on the Wings

    All Fun
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  32. #112
    skywagon8a's Avatar
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    Quote Originally Posted by avnxtek View Post
    I have the Baffling around the flywheel to go yet. I see some use it and some don't any opinions on that?
    Just fit your baffles tight enough to prevent as much airflow as possible to pass from the top to the underneath in this area, You want all of the cooling air to pass through the cylinder fins. Some make a streamlined shroud that fits behind the flywheel others just fit flat stock in tight. Same results. If you had a high speed airplane it may pay off to spend some time with streamlining the baffles.
    N1PA

  33. #113

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    where did you get the throttle levers, pretty cool.

  34. #114

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    Quote Originally Posted by tempdoug View Post
    where did you get the throttle levers, pretty cool.
    Like most things I can't find what I want so I have to make them
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  35. #115

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    very nice.

  36. #116

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    Well I think I'm far enough along with the firewall forward to move on to the wings

    image.jpg

    image.jpeg

    Oil cooler I used a 3" SCAT with a butterfly valve

    image.jpeg

    More baffling around the flywheel. Should seal up good. I hope!

    image.jpg

    So so ready to start on the wings

    Anyone have a good drawing for inspection hole placement ?
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  37. #117
    skywagon8a's Avatar
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    Quote Originally Posted by avnxtek View Post
    ...So so ready to start on the wings

    Anyone have a good drawing for inspection hole placement ?
    This is where you make your own. Study your wings for every place that you may need access or that there is something that may need looking at. Then place an inspection ring there making sure that you have room to get your hand in and around any obstruction that may be there. Don't depend on someone else's drawing.
    Look here: http://www.supercubproject.com/drawings/ There may be a drawing that gives you what you are looking for.
    N1PA
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  38. #118
    www.SkupTech.com mike mcs repair's Avatar
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    I like to lay tape measure on wing before cover and take a picture of tape near each location that I may need to access for maintenance in the future.... make your life easy now, you might need in there again.. not that i cut them out.... just in case you need...

  39. #119

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    I covered the bottom of the wing first, then marked my inspection hole locations with a pencil from above. So far so good on the locations.
    Staying alive in an airplane has a lot more to do with mastering ourselves than mastering the aircraft.
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