BB56 & Wild Argentina Pucara Project

Discussion in 'Scratchbuilding!' started by Wildthing, Dec 24, 2018.

  1. I use to dread cutting out the wood ones, such a pain.
     
  2. A few pictures of the Pucara dry fitted together, looks pretty cool BB56 :)

    2018_1229_171558_001.JPG 2018_1229_171606_002.JPG 2018_1229_171618_003.JPG
     
  3. Well motors are in, servos are in including the elevator servo, struts for the horizontal are on. Now to solder up some motor leads then I can put the upper engine cowls on. For more gluing surface plus a little extra strength I added doublers to the lower fuse panels .



    2018_1229_195030_001.JPG 2018_1229_175744_001.JPG
     
  4. bogusbandit56

    bogusbandit56 Top Gun

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    Excellent:)
     
  5. hwilton

    hwilton Airman

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    I would have doubled up the tail fin as well as cf rods
     
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  6. andy_downs

    andy_downs Ace Pilot

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  7. My table is 4'X4' , :)
     
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  8. Time will tell. :)
     
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  9. bogusbandit56

    bogusbandit56 Top Gun

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    I used to have a perfect hole drill that was brilliant for cutting those mounts, but I tried to drill a coconut for the birds and it totally ruined it.
    If you can get a good quality drill you can drill the coconut and hang it up outside. The birds will eat the contents and when it`s empty some lucky sod can build a nest in it.
    I wish I had not drilled the coconut as I never managed to drill right through before ruining the drill.
    Now the birds have no food or home and I don`t have a brilliant tool for cutting motor mounts from plywood.:(
     
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  10. That's actually a cool idea, never heard of that before. :)
     
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  11. bogusbandit56

    bogusbandit56 Top Gun

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    I have salvaged some parts from an abandoned build and tested them before they go into the wing of my Pucara.
    My build is going very slowly because I`m in a quandary about the empenage. Even before Hwilton pointed out the size of the tail and H-stab I have been having my doubts.
    I usually go with an H-stab of 1/3 of the main wing span, but when the tail feathers are on the fuselage, they look very small.
    I have done the calculations several times and they do correspond to the main wing, but only just.
    I`m hoping to get the fuselage buttoned up today and then play around with the empenage.
    At the start of this project I wanted to go with a vertical that was made up of two thickness`s of 6mm depron for strength, but the fuselage is quite thin at the back.
    Wrapping the vertical in brown paper would probably give enough strength without doubling up so that is what I`m going to do. I will also increase the size of the H-stab and may be that will get the BP treatment as well. I will use glass tissue to reinforce the joins of the H-stab and V-stab so I don`t have unwanted movement of the empenage.
    The placement of the elevator servo may be frowned on in some circles. Jeff and I have decided to mount the said servo underneath and directly to the H-stab like I did on my AN2. This is so the servo works directly on the elevator surface and nothing else. It is also much easier than using a bell crank or running a snake up the vertical.
    The rudder servo will be let into the rear of the fuselage and glued to the vertical stab inside the fuselage for the same reason as the elevator.
     

    Attached Files:

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  12. I am not smart enough to have doubts :D :D . The AN2 is scale and just about the same size and the vertical is rather small, I assume the double wings help with some stability.
     
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  13. bogusbandit56

    bogusbandit56 Top Gun

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    I don`t think you can compare the two planes really.
    If the H-stab was mounted lower on the Pucara like the AN2 I would not be so concerned, but you have to think about the leverage and forces working on the H-stab at the top of the V-stab.
    I think I will play chicken and wait for you to maiden yours and see the out come:D
     
  14. That's why you stalled and let me get ahead in construction :D :D
     
  15. bogusbandit56

    bogusbandit56 Top Gun

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    Well there is that and I`m trying to catch up with three seasons of Gold Rush that I have on free trial from the Discovery channel before it runs out.:D
    I`m not going to get anything done chatting on the forum so it`s back to the cracked top work bench:)
     
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  16. Well finally soldered up some motor leads, so they are fished in now. :) For an extra little bit of precaution I shrink wrapped the connections before the cowling goes on. Cowls then went on, (looks pretty cool (even if they aren't round ;) ) . Let that setup a bit and then I can wedge fill those joints.


    2018_1230_164206_001.JPG 2018_1230_164210_002.JPG 2018_1230_171854_001.JPG 2018_1230_171901_002.JPG
     
  17. homey666

    homey666 Top Gun

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    That's awesome. Are you going to leave the motors standard or mix throttle dif?

    Peter
     
  18. Just normal for me, we will see what BB56 does. ;)
     
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  19. bogusbandit56

    bogusbandit56 Top Gun

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    I was going to go throt diff thrust, but we will see:)
     
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  20. sirskyhi

    sirskyhi Ace Pilot

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    Ok Jeff, where did you get the Elevator supports?
     
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