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Thread: A chinese's PA18 project----I need your sugestion.

  1. #81

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  2. #82

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  3. #83

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    Did the little knife start out the same size as the big knife before you started cutting out all those parts? (Joke. LOL !!)

    Nice parts. Now to bend them!

    C2j

  4. #84

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    Quote Originally Posted by Longwinglover View Post
    Did the little knife start out the same size as the big knife before you started cutting out all those parts? (Joke. LOL !!)

    Nice parts. Now to bend them!

    C2j
    Although I understand your joke hardly bucause my limited english ability ,but I like that.

    The knife are made from 440C steel,thickness .2559inch,that is 6.5mm,total length:bigger knife:288mm=11.3386inch smaller:7.677inch=195mm.

    I want ask you a question,how people use a Cub to make a living?what do they use for?I mean most of Cub host.Thanks.

  5. #85

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    There are people and businesses inplaces like Alaska and Northern Canada that use the PA-18's ability to land and takeoff from short unprepared (no runway) areas. They fly hunters, tourists and others that need to get "there" for a living.

    C2j

  6. #86

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  7. #87

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    I ordered #33521 engine bracket from airspruce,when those parts arrived China,I find they are not welded togther.Who can tell me the center hole edge I should welding or not welding?I inquired about Airspruce,they know nothing about how to installation and material.Which kind of welding rod can I use?

  8. #88

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  9. #89
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    Quote Originally Posted by sageelite View Post
    I ordered #33521 engine bracket from airspruce,when those parts arrived China,I find they are not welded togther.Who can tell me the center hole edge I should welding or not welding?I inquired about Airspruce,they know nothing about how to installation and material.Which kind of welding rod can I use?
    Sounds like there's an error and you have part #33522. The following is cut and pasted from their Q&A:
    What are the differences between the 33521, 33521-B, and 33522 dynafocal rings?
    The 33521 is the standard mount with all the rings welded to the tubes to make a complete mount. 33521-B is similar to the 33521 but is a type 2 mount, which has an 18 degree angle. 33522 has the 2-3/4 inch I.D. retainers and the tubing cut and bent, and they must be welded all together to make the mount.

    Mark J
    Practicing open cockpit extremism

  10. #90

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    Quote Originally Posted by marcusofcotton View Post
    Sounds like there's an error and you have part #33522. The following is cut and pasted from their Q&A:
    What are the differences between the 33521, 33521-B, and 33522 dynafocal rings?
    The 33521 is the standard mount with all the rings welded to the tubes to make a complete mount. 33521-B is similar to the 33521 but is a type 2 mount, which has an 18 degree angle. 33522 has the 2-3/4 inch I.D. retainers and the tubing cut and bent, and they must be welded all together to make the mount.

    Mark J
    Thank you marcusofcotton,you r right,I checked my invoice the part number is #33522,wrong in remember.Could you tell me how to weld them together?

  11. #91
    marcusofcotton's Avatar
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    As far as welding rod and technique, I'd use the same as you are comfortable with on the fuselage tubing. Unfortunately I cannot speak knowledgeably on the further welding specifics, sorry.
    Practicing open cockpit extremism

  12. #92

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    Use a heavy duty bender bench,I bend all my (heavy duty)bracket,why I say my bracket are heavy duty,because I can't find .1or.9inch thickness 4130N plate,so I use 3mm 4130 plate,about .118inch thick.Click image for larger version. 

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  13. #93

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    Torque tube rear bearing use 1.6mm about .062inch 4130N steel plate,not all with .118inch thichness plate.

  14. #94

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    One thing I want tell all forks,I made those parts are very cheap,I am not sure why those parts made in USA are very expensive?Some of price are 10 times of my price.If somebody want those parts,I can made for you,just at price $5+shipment for one.

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  16. #96

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    The earlier post concerning cost, remember it's relatively expensive to live in the U.S.A., Most of the parts come from FAA approved shops, I think even raw materials are more expensive here and don't forget our lawyers. Only the government section of the phone book has more entry's than the legal section so a lot of liability risk here. I'm sure the owners live a little better than the workers but unless the aircraft part is a side business I don't think we have to many really rich shops over here. Were lucky we have the decent businesses supporting aviation that we do. Very specialized and a lot of one off parts. All that said it's still expensive for the hobbyist. The aviation businesses here are of course low hanging fruit if China wanted to go after them but I can't see how it would be worthwhile except for maybe the amateur built market and we are pretty fickle.

    Your parts look real good! I have made some of those from scratch and I know how hard they are to figure out. Are you still coming here eventually or do you think private flying will become more encouraged there? My sons girlfriend returns to Beijing on Saturday.

  17. #97
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    Quote Originally Posted by sageelite View Post
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    Both of these parts are not airworthy. They both have sharp corners and notches where the bend is made. This will start a crack over time and will fail. The first part holds the wing on the plane.
    N1PA

  18. #98
    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by skywagon8a View Post
    Both of these parts are not airworthy. They both have sharp corners and notches where the bend is made. This will start a crack over time and will fail. The first part holds the wing on the plane.
    as I turn around and look at the Airframes fuselage, and it looks to be the same bend radiuses.... and those are each only HALF of a 2 piece welded item, the notches get disappeared in the edge welding process....

  19. #99

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    Quote Originally Posted by skywagon8a View Post
    Both of these parts are not airworthy. They both have sharp corners and notches where the bend is made. This will start a crack over time and will fail. The first part holds the wing on the plane.
    I saw that (the notches at the bends) but figured he had followed the original blueprints and somehow those were not finished yet. Sky can those be made airworthy by finish welding across those areas? I know that is a very basic question but I don't have a welding background and is one of the reasons I have to really follow the plans to the lletter as much as I can since I don't have good knowledge in that area. Good catch.

  20. #100

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    Looks like Mike answered my question as I was asking it. Maybe.? I guess the basic question: "Can't welding fix anything?" A good weld is assumed. My local mechanic took a look at one of my gas welds on an aileron hanger and said it was no good. I have a bunch of parts to build these but I'llprobablyhave someone else finish weld any welding I need. I would not attempt a fuselage like Sage is doing. Very impressive to me.

  21. #101
    skywagon8a's Avatar
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    Quote Originally Posted by mike mcs repair View Post
    as I turn around and look at the Airframes fuselage, and it looks to be the same bend radiuses.... and those are each only HALF of a 2 piece welded item, the notches get disappeared in the edge welding process....
    Mike , I'll agree on the lift strut fitting. I don't know what those other fittings are. Those cuts right at the reverse bends look bad. Are they welded? Depending on their use that could be a highly stressed area.
    N1PA

  22. #102
    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by skywagon8a View Post
    Mike , I'll agree on the lift strut fitting. I don't know what those other fittings are. Those cuts right at the reverse bends look bad. Are they welded? Depending on their use that could be a highly stressed area.
    yes, looks like inside of front wing attach

    http://www.supercubproject.com/drawi...s/A3290578.pdf

    hmm or kinda like a rear...
    http://www.supercubproject.com/drawi...s/A3290514.pdf

  23. #103

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    Quote Originally Posted by qsmx440 View Post
    The earlier post concerning cost, remember it's relatively expensive to live in the U.S.A., Most of the parts come from FAA approved shops, I think even raw materials are more expensive here and don't forget our lawyers. Only the government section of the phone book has more entry's than the legal section so a lot of liability risk here. I'm sure the owners live a little better than the workers but unless the aircraft part is a side business I don't think we have to many really rich shops over here. Were lucky we have the decent businesses supporting aviation that we do. Very specialized and a lot of one off parts. All that said it's still expensive for the hobbyist. The aviation businesses here are of course low hanging fruit if China wanted to go after them but I can't see how it would be worthwhile except for maybe the amateur built market and we are pretty fickle.

    Your parts look real good! I have made some of those from scratch and I know how hard they are to figure out. Are you still coming here eventually or do you think private flying will become more encouraged there? My sons girlfriend returns to Beijing on Saturday.
    Yes,I got a Interview Invitation Notice that form Canada at 29th this month,but I will go to Yakima frist,for my tailwheel endrosement.Congratulation to you will got a daughter-in-law,but be careful,chinese daughter even in law would empty your wallet.Lol,a joke.I have to Canada eventually.

  24. #104

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    Quote Originally Posted by skywagon8a View Post
    Both of these parts are not airworthy. They both have sharp corners and notches where the bend is made. This will start a crack over time and will fail. The first part holds the wing on the plane.
    Really?but I dont think so,they are made of .118inch(3mm) thick 4130N steel plate,thicker than normal PA18 buleprint shows,the notches came from my design for aim of bend easy and reduce stress,they will be weld togther when install.Pls visit www.super-12.com,the parts they make same with mine.

  25. #105

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    And I want to say all my parts will be heat treat after they are welding finish by myself,use a small heat treat stove,because the stove are very cheap here,the picure of stove only $150USD in China.Click image for larger version. 

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  26. #106

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    Some of parts are track welded,I am waiting a ceritified welder came to my city for finish welding.And I have over 10years engineer background,I am sure the notches is no problem after welding and heat treated.

  27. #107

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    And I will use electric heat string heat treat all the tube join of my fuselage.And the string can work with 110V 60Hz,only $10USD per feet.Click image for larger version. 

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  28. #108

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  29. #109
    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by sageelite View Post
    And I will use electric heat string heat treat all the tube join of my fuselage.And the string can work with 110V 60Hz,only $10USD per feet.Click image for larger version. 

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    probably unnecessary step..... you just end up loosing the "nice shape/bow" of the longerons.....

  30. #110

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    Quote Originally Posted by mike mcs repair View Post
    probably unnecessary step..... you just end up loosing the "nice shape/bow" of the longerons.....
    I think heat treat the welding section will not change the tenacity of the material,but can eliminate welding stress.what do you think?

  31. #111

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    The bridcage structure are composed of triangles,you said would loosing shape/bow?Could you explain to me?Thanks.

  32. #112

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    Arived Yakima,UNION-Grap,anybody nearby?shall we meet discuss cub?

  33. #113

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    If you are using a mild steel filler rod when you weld, dont bother heat treating. Post-weld treatment is only necessary if you use 4130 as your filler material.

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  35. #115

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    Time is flying,half a year is past,this January,I visited Yakima of USA,have a tour to Cubcrafters and YakimaAeroSport company for learn fly and more details of how to fabricate a cub.I flyed a Cessna150 and a 180cub in Yakima airport.The cub is really a amazing plane for fun.Very smoth,like a moive that named Avatar.I believe I had a correct choice,thanks all suggest me.Because I am very busy in those days,my job,family,kids,so,the process of my cub project havn't more progress,but I learned a lot and have more knowledge about cub.

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  37. #117

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    My instructor lead me visited this cub in Yakima,I know that's maybe famous but I couldn't understand the narration absolutely for my limited Enlish.The question is :this cub have a electric driver three section flap(I dont know the English name of this kind flap).Could anybody tell me which size or type electric driver pusher I can install on my flap?

  38. #118

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  39. #119

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    Before I leave America,the hardwards and parts I ordered arrived hotel.
    Last edited by sageelite; 06-12-2015 at 01:30 AM.

  40. #120

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ID:	20501Another question,I bought this fuel cap but forgot the flange,I could not find a suitable size for this cap in China.Who can tell me where can I buy it?

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