747-300 to rephis time. Am I in the business or what?

Discussion in 'Start to Finish Builds' started by N4521U, Jul 11, 2014.

  1. N4521U

    N4521U Well-Known Member

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    #1 N4521U, Jul 11, 2014
    Last edited: Jul 11, 2014
    Well...... out of the last repair I did on a 747 came this one from NZ. It's a bit more work than the other, not to mention twice the size!y postings on a collectors website. Works for me. Some hobby eh?

    Starting with the wings.
    Two engines missing, one inboard, one outboard on the Port side. Difficulty is the starboard side had been broken off and remounted with two part epoxy, heavy! So the joins are kinda built up and a little off center. The short break on the inboard engine will have to be built up outwards a bit so I can cut the globs off the wings and get the engines to sit correctly. So I have to mold and cast each engine and fairing. The fairings are different.

    Some cracks in and thru the wings, front to back, and along the length will have to be repaired. Broken off tips of some of the pointy things and some chips and crascks in the paint.

    No horiz stabs on the tail, I will get fusey when wings are finished. I'll have to find a top scale view of the 747-300 and pattern the tail parts and make them from scratch.

    Good news is, he haas a painter in NZ who can do the finish painting. This thing, like most is super glossy.

    Work begins. Maybe I can get a new airbrush, if Wayne will give me the paticulars on the one he has. Hint hint.
     

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  2. mikewint

    mikewint Well-Known Member

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    Impressive Bill, would not even know where or how to begin
     
  3. fubar57

    fubar57 Well-Known Member

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    Going to be a challenge Bill. Maybe send a post to Rob(Trebor) about the top plans, he's all things airliners.

    Geo
     
  4. Wurger

    Wurger Siggy Master
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  5. N4521U

    N4521U Well-Known Member

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    It's a bit of a puzzlement Mike............ I is still cojitating.
    Goe, I may do that very thing. I need engine detail shots as well.

    This is 1/48th scale. Each wing is 575mm fusey to wing tip in the plan view.
     
  6. Lucky13

    Lucky13 Forum Mascot

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  7. N4521U

    N4521U Well-Known Member

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    I think I have come up with a final plan on this one. BTW, ever tried looking for a 1/48th 747-300? Haven't found one yet!

    So my plan is to make a master of one engine, all cleaned up, nothing attached and I'll have four good engine castings all alike.
    Clean everything off both wings, nice and smooth.
    Then, if I can find an inboard and outboard pylon profile, I'll fabricate a more realistic pylon for each as a seperate part and assemble.
    Quicker, and easier.
     
  8. N4521U

    N4521U Well-Known Member

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    So here's waht I have found and put together.
    From a repair manual for the 747, all models for the pylon engine mount covers.
    The manual shows a GE, the display model has Rolls engines. So I found a good side view of an early Qantas 747-300 with RR engines. Layed the photo over the dwgs at scale and Bob's your uncle. SO now I can mfr an accurate profile for the pylon. Have to find a way to Turn a wood engine tho as these will be pretty well toasted.

    I can pick at it while I finish GB22!
     

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  9. T Bolt

    T Bolt Well-Known Member

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    Sounds like a good plan Bill, but before you start the pylons I would confirm that the curve at the top of the pylon where it meets the wing matches the wing of your model. Even if the pylon drawing has the right curve the lower surface of the models wing might not.
     
  10. N4521U

    N4521U Well-Known Member

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    Yep, my plan would be to fit each pylon individually......

    I've jumped in and cut off and shaped the engine with the really buggered up pylon. Sprayed on a bit of primer. The core of the engine, and the wing for that matter seems to be foam. A sealer and paint overall. I was just a little nervous going in to the hacking part, but all came out okay.

    I will get some balsa for the ruffing of the pylons. The attachment point will be finished as ready to attach at the engines. I'll make a pocket in the engine to recieve the pylon. The surface to match the wing will be ready to custom fit each station of the four engines.

    Next will be smooting the wing attachment points after removing all the broken bits. I'll try and get some of the stuff automotive guys use to "cake frost" bodywork for ultra smoothing. I think it is different than bondo, softer and finishes very smooth. I think it's yellow. Will have to make a few calls.
     

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  11. N4521U

    N4521U Well-Known Member

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    So yesterday I went out to the local hardware store and got a strip of balsa, cut it into three bite size pieces, glued them together with some plane old white glue. I weighted them down with a chopping block to set flat. Cut up my scaled size dwgs of the pylons and glued them down with the POWG as above. I just have to cut them with a little coping saw, file theem down to fit the wing and engines, seal the balsa, paint with some glossy enamel and make molds. Yeah, right.

    I sailor on, bit by bit.
     

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  12. Lucky13

    Lucky13 Forum Mascot

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  13. javlin

    javlin Well-Known Member

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    Interesting Bill ;)
     
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