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  1. #1351

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    RE: Scratch building 105

    Just a small update:

    Just finished fibre glassing the aft dome cowl plug, as you can see these cowling's are very complicated and have more then 1 pieces to make them complete as one unit. Lower scoop is all shaped, filled and sanded, now awaiting it's turn to get fibreglass covering on it.

    Pics coming soon...
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    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  2. #1352

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    RE: Scratch building 105

    Lower air intake scoop is now glassed and it's curing as i make this post. What a tricky piece to fibreglass....WOW!

    After this, next step is to make flanges for both dome piece and this scoop to get molds made from these....
    Lower scoop has to be cut and molded in 2 sections due to air vain and scoops intake will act as undercuts if i tried to do it as 1 unit.

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    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  3. #1353

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    RE: Scratch building 105

    Both piece have been glassed and are now fully cured, i lightly sanded the lower scoop piece, filled few low spots with Spackle and now will do final sanding before i cut it into sections to make molds on it.

    Dome piece needs light sanding on it's side as well, this way it will be easier to stick aluminium foil pieces as panels on it.


    Question?
    Now do i need to spray primer on the dome piece after aluminium panels are attached to its side and burnished nicely along the edges or i can just apply wax, gelcoat and then matt cloth pieces to make the mold....
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    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  4. #1354

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    RE: Scratch building 105


    Tonite's update..

    Lower Scoop has to be cut into 2 sections in order to avoid undercut situation from upper air vain part of the scoop. After the cut, main body's open foam cells were sealed with a piece of fiberglass sheet that i made myself few months ago for various purposes. This is pretty much straight forward molding process from here onwards. Front section will be lightly hot glued to ^ parting board, then i will be waxed and then matt fibreglass cloth's pieces will be applied in mold making process of this section. I'll do same for middle and back body of the scoop. This section's parting board will be glued on the curved U surface!, this way mold will be made as if scoop is inverted....
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    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  5. #1355

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    RE: Scratch building 105

    First and second layer of cloth pieces are layed up on the plugs to make the molds. Not sure why n how but i totally forgot to apply gelcoat on the waxed plugs and parting boards but started to do lay up without it. When I realized this mistake, it was right after i was done with laying up heavier cloth on main scoop's main body plug.
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    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  6. #1356

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    RE: Scratch building 105

    Gentlemen, May i present you the Lower Air Intake Scoop's molds!!!!
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    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  7. #1357

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    RE: Scratch building 105



    Cowl's rear dome section was attached to parting board with hot glue, then it was waxed as you will see in first 2 pictures, wax was then rubbed to it's sheen for smoothness of it's surface, i applied 3 coats of wax, just to get enough on the surface so that parting will be easier from the mold later on.

    After wax, thin layer of glass cloth strip was first applied at the base all around with epoxy laminating resin, then followed by heavier layer of 4 oz cloth pieces. Presently this layer curing and i will add couple more layers tomorrow so mold will come out nice and solid.
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    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  8. #1358

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    RE: Scratch building 105


    Can anyone tell me what these foam balls will be used for...look around clue is on this page......lol
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    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  9. #1359
    iron eagel's Avatar
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    RE: Scratch building 105

    They going behind the props?

  10. #1360

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    RE: Scratch building 105

    your missing balls?
    ORIGINAL: Props4ever


    Can anyone tell me what these foam balls will be used for...look around clue is on this page......lol

  11. #1361

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    RE: Scratch building 105


    ORIGINAL: iron eagel

    They going behind the props?
    Like minds thinks the same way...yes indeed these will be sliced at half point or at 1/3rd poinr n will go in between props n cowlings intakes.
    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  12. #1362

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    RE: Scratch building 105


    ORIGINAL: Samedayservice

    your missing balls?
    ORIGINAL: Props4ever


    Can anyone tell me what these foam balls will be used for...look around clue is on this page......lol
    Eric, Get off my threads n stop chasing me around!!, there is nothing good you say or post except for jerking around with ur lame n disgusting thinking...guys check his profile n ull see what im saying....its nothing less then web stocking another member!..
    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  13. #1363

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    RE: Scratch building 105

    Cooling fairing in making...

    I have spent last couple weeks trying to find something that will work for this purpose but nothing really i could find with right shape and diameter then those foam balls at 2.5" dia and just about right shape to make these. Here is how balls turned into cooling failings for Wright 3350 engines..

    Basically i cut it in half, sanded away the inside with my Dremel n drum sander, drilled a hole in the centre for the prop adaptor's shaft and placed it between prop and washer. I will most likely fibreglass it from outside and then make a mold of this piece also.
    My only concern is about the cooling of the motor now, this 2.5 dia is 1" larger then the dia of the motor's can, so i'm not sure if i would need more air flowing in the cowl from intake's opening or plus opening from upper fairing to cool the motor or not....
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    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  14. #1364
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    RE: Scratch building 105

    You will have to redirect the air after it comes in the cowl so it goes around the motor. You can do this with anything that is lightweight, keep the airflow in a space about 1/16th inch thick as it goes by the motor and then have a provision for the cooling air to exit the nacelle.

  15. #1365

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    RE: Scratch building 105

    For air to exit the cowls is not a problem at all, there will plenty of that but now i have figure out how to make internal air vains to direct air on top of the motor's can and flow over it, as you said at 1/16" above it.....maybe a funnel type of a shroud that would be glued just in side of the intake ring with attachment at 3 strategic spots for support.

    Front of this shroud would be almost same diameter as the inside of the cowling, back would be just 1/16th larger then the can itself, this way air's flow will be directed over the motor soon as it passes through the intake ring....




    PS: I better change my signature as this project is just about anything else but KISS.........lol
    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  16. #1366
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    RE: Scratch building 105

    Sounds like a plan
    Yea Sam, it funny as they evolve what started out simple gets more and more complicated.
    But it's those small details that make it perform...

  17. #1367

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    RE: Scratch building 105

    I think i have founda light lense that will do this trick. With this i would have to place it at right location on the motor so when air circulates between this curved disk n the cooling fairing it cools the motor as it passes through 1/16" gap between disk n motor.......

    ill take couple pics of this light lense fixture n post on here to show how its like.
    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  18. #1368

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    RE: Scratch building 105

    Here are pics of the light lens i will use to make the motor cooling dicks.
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    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  19. #1369

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    RE: Scratch building 105

    Juss did a quick drawing to show the placement of the motor cooling disk inside the cowling. There will be 1/16" gap allowing air to flow through while cooling the motors in flight n on ground.
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    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  20. #1370
    iron eagel's Avatar
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    RE: Scratch building 105

    Nice.

  21. #1371

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    RE: Scratch building 105

    Dome piece mold is done, added another layer of 6oz cloth followed by matt fibreglass cloth. This piece should cure over night and tomorrow it should be ready for parting the mold from the plug.

    Since i had some extra resin that i didn't wanted to waste, i glassed one of the 2 half pieces of the foam ball that will become engine coolong fairing that is located between propeller and engine's main intake lip.
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    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  22. #1372

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    RE: Scratch building 105



    Call me nutzz or alien from another planet but i didn't sleep yet, waited all through nite to get this dome's mold done...

    Well it's almost done, needs bit of epoxy putty at few small low spots made by air bubbles during lay up and layering process of the fibreglass cloth and matt. No biggie, i'll do that during the day today.

    Unfortunately plug didn't survived at all....
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    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  23. #1373

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    RE: Scratch building 105

    Started playing with aluminium foil tapes, here i made couple of cockpit window panels to see how it will look, plus i also made small overlapping panel line test at one location behind the cockpit to see how 1/32" panel line could be achieved with aluminium foil high speed aviation repair tape.
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    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  24. #1374

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    RE: Scratch building 105

    Hi Sam,

    Everything looks as if it is coming along great. Keep at it. KISS doesn't apply to models like this.

    Don't forget to cool the ESCs as you work on cooling the motors. Also, are you going to cut out the windows and
    install plexiglass panes?

    George

  25. #1375

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    RE: Scratch building 105

    Not to be a stick in the mud or anything, but Ithink the shape is off a little. Iwould use a bigger ball and chuck it up in a drill and grind off the edges (lathe fashion) for a more scale look.

    Good job your progress is astounding.


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