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  1. #1326

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    RE: Scratch building 105

    Here are few more pictures with the update.

    On 2nd cowl i have made all 3 exhaust port openings and sanded the cowl. This took off all the flash and high points. I also dry fitted aft cowl dome to see how upper and lower attachment locations will be on the dome. It still needs bit of work on the attachment locations.

    As for aft cowl dome, i'm thinking to cast those from carbon fiber as i can use them directly to install the motors mounts on the dome with 3/8" plywood backing.

    3rd cowl is also under making at this time, just finished doing second layer to reinforce the cowl.
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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. #1327

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    RE: Scratch building 105

    3rd Cowling juss pulled from the mold...

    All 3 cowling together, This one has different color tint to itself, Why i have no clue..

    These reminds me of time when CF-TGE was stored at Polaris trucking company's yard and all 4 cowlings were stacked together vertically just like these......
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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. #1328
    iron eagel's Avatar
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    RE: Scratch building 105

    Only one to go, looks good.

    As far as using the domes to mount the motors, I would embed the ply into the layup and I would think that 1/8 inch ply should be all you need as it will be backing up composite structure.

  4. #1329

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    RE: Scratch building 105

    ORIGINAL: iron eagel

    Only one to go, looks good.

    As far as using the domes to mount the motors, I would embed the ply into the layup and I would think that 1/8 inch ply should be all you need as it will be backing up composite structure.

    Good suggestion Paul, I'm not so sure about 1/8" Ply but i would minimum would go 1/4" just to have peace of mind plus, i will add 2nd layer copulating the wooden piece between both layers. This way it will be super strong and will take all the that it will get from the motor. I would be using blind nuts to tighten there mounting screws or stand off if i could find them for the length i will need.

    As for the cowls, yeah 1 more needed for the model but i'm going to make 3 more!, two to keep as spare and 1 will be going to my buddy Frank who helped me with making these awesome molds....
    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  5. #1330
    iron eagel's Avatar
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    RE: Scratch building 105

    Keep in mind with an electric motor you don't have the vibration of an IC engine to deal with so the supporting structure does not need to be as robust. Now is about the time to start checking things like the weight and balance making sure your COG is going to be close.
    In the final stages of the build I like to really keep and eye on where that is headed...
    Granted with the small stuff it is far more critical, but still any weight you have to add to get your CG right is baggage.

  6. #1331
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    RE: Scratch building 105

    If you do the nose bowls in carbon and use them as a firewall, 1/8" ply firewall will be plenty strong enough
    Thomas W.
    Euro-sport Evo, Scratch built 1/7 F-14D Tomcat, 26.5% Gee Bee R2

  7. #1332

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    RE: Scratch building 105

    [youtube]http://www.youtube.com/watch?v=BlTOT-Ip_VU&feature=colike[/youtube]
    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  8. #1333

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    RE: Scratch building 105

    Well i just finish doing layup of 4th cowl, i was hoping to do it faster then others but it still took couple hrs fro the while process. Tomorrow i will.start making molds of the dome/bowl piece and lower intake scoop.
    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  9. #1334

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    RE: Scratch building 105

    Finally juss pulled 4th Cowl from the mold, ud imagine by nowthese would juss pop out, Na dont kid urself,.this one was most stubbun coming out of the mold. Later on today i will assemble whole model with all 4 cowls on it and do a photo shoot of it.
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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

  10. #1335

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    RE: Scratch building 105


    Well here i dry attached all 4 engine cowlings on the Constellation. Can't wait to make the mold of the aft dome piece so i can actually mount these on the nacelles permanently.

    Presently i'm making the mounting surfaces on the dome piece plug, there dosen't seems to be much attachment area on the upper mounting surface for main cowls to solidly attach on the dome.
    I'm going to see if i could block the air passage at the mounting location and use that to secure cowl on the dome section. Lately i've been thinking on making these cowls open in scale fashion for display and motor and esc maintenance but lets see if
    i could go that far.




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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

  11. #1336

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    RE: Scratch building 105

    Main air intake opened up on #2 engine cowling, i also opened up cut outs for all 3 exhaust opening on both sides cowl flap doors.

    This cowl was also sanded smooth, took off all the flash and joint lines from the molding process. All this one needs is use of auto bondo filler to fill all the low spots on the cowling before it's primered..
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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

  12. #1337

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    RE: Scratch building 105

    Cowl's aft dome piece is almost ready for molding process. All three exhaust outlet contours needed to be made more crisper and sized properly according to port cut out on the main cowling. I am going to put light layer of fiberglass to seal all the filler work just done on it plus also to keep it crisp. Then i'll use flite metal to make the side panelling on this dome piece and add some rivet and panel lines detail. After this dome plug will be ready for mold release....
    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  13. #1338

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    RE: Scratch building 105

    Also preparing lower air scoop for fibre glassing before i cut it into pieces to make the molds of it. It's going to be in 2-3 pieces so all undercuts are avoided.
    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  14. #1339

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    RE: Scratch building 105

    Cowling aft dome plug...

    Plus a over head shot of CF-TGE when it was used as a restaurant back in mid to late 90's n into early 2000's...
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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

  15. #1340

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    RE: Scratch building 105

    This motor mount's footprint on 1/8" ply will be cut off the sheet and will be glued on the dome at the centre of it. This will help in making cast parts with this indentation inclusive once this mold is made.

    EDIT: 10 mins later foot print ply piece is cut, edges sanded and placed on the face of the dome piece.
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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

  16. #1341

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    RE: Scratch building 105

    Ok, iwas waiting and hoping to get some feedback before i commence on fiberglassing this plug n then making its mold. since No one has said anything, im going ahead with my plans.
    I do believe in KISS (Keep it simple silly), but doesn\'\'t mean my models fall in this category!
    CUB BROTHERHOOD# 173

  17. #1342

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    RE: Scratch building 105


    Motor, mount, mounting plate and aft cowl dome plus dry assembled together to see how they will the mounted and also to see the clearances.
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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

  18. #1343

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    RE: Scratch building 105

    Now with cowling on but with and without prop mounting collet piece.

    It would have been nicer if i had the propellers on me at this time, that would have been perfect test fit of everything together.
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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. #1344
    iron eagel's Avatar
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    RE: Scratch building 105

    The domes look good Sam, I really like the look of the cowls with the exhaust cutouts as well.
    Only one thing the motors look like there sticking out a bit to far, you will know better when you get the prop adapters in place.
    Are you going to use a dummy radial cover for the motors?

  20. #1345

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    RE: Scratch building 105

    Thanks Paul,

    Yeah this is just a dry assembly test i did just to see how things will be once CF domes are made. Off course proper spacing will be done later on.

    No i will not be using dummy radial engines as there will be another round 1/2 doughnut shape pieces that will go between the spinner's backing plate and into the air intake!. This is one of those odd things that only certain types of aircrafts had and S Connies had them with Curtis Wright 3350 engines...
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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

  21. #1346

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    RE: Scratch building 105

    Here are few more pics with old APC 2 Blade 12x6 prop i found in my stash of stuff.

    It sure looks tad further then where it should be but with this 1/2 doughnut piece, i think it will make it look where it should be in the end.
    I'll see if i should engrave this ply piece 1/16" into the dome's face plate structure, this way gap will be 1/16" reduced in prop/cowl spacing.
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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. #1347

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    RE: Scratch building 105

    Paul,

    Here you go, i just removed the ply plate and reduced gap spacing by 1/8" between prop n 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

  23. #1348

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    RE: Scratch building 105

    Paul,

    Here you go, i just removed the ply plate and reduced gap spacing by 1/8" between prop n 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

  24. #1349
    iron eagel's Avatar
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    RE: Scratch building 105

    Oh yea, I forgot about those center faring in the cowl, no need for dummy radials here!
    Rather than yank out the plywood I would look at shorting up the mount a bit.
    I have used these mounts in the past myself and had to "modify" them so I could get the motor tho sit where I wanted it to. There is some cutting and drilling required I know, it's just that the mounts come as one size fits all and in the real world that never seems to work. Besides I like to keep all the spinning mass of the motor closer to the firewall, it puts a lot less stress on the entire assembly, as opposed to having the motor cantilevered out from the firewall. One another note I have mounted the motor internally to the mount as well using the spinning shaft that sticks out he back for the prop mount. Now in that case the wires were visible but with your center fairings that shouldn't be a problem to bury them.

  25. #1350

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    RE: Scratch building 105

    Lower air scoop!!

    Well every time i say to myself, it's done and ready for final layer of glassing, i look at it from another angle and there is more to do on it before i can say it's done ready for glassing. I had to add extension at the rear end of the fairing to get nice even uniform blend of this on the nacelles and main gear doors. Then came filling and sanding, filling and sanding steps over n over!. Well hopefully after sanding this last section, it's ready for final layer of fiberglass and then making molds of it...
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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


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