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Thread: Techpod HD: a heavy duty upgrade build thread

  1. #11
    I see you... Derrick's Avatar
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    You can make precured plates using a vacuum bag and a section of wing... your layup will look something like this:

    Bag
    breather
    waxpaper
    carbon layers
    waxpaper
    wing
    breather
    bag

    It will be much harder than you think to get flat plates to conform to the airfoil after they are cured and stay in that shape over time. Looking forward to seeing your product.

    D
    When nothing else out there will suit your needs... design and build it yourself.

  2. #12
    Test pilot addict airtruksrus's Avatar
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    That was a big problem I found and stuck using the laminated plate for flat surfaces. I try to use a slow cure epoxy with the carbon cloth if I use it to wrap compound surfaces, just need to supply a small amount of heat from the space heater in an enclosed area to have it cure within a reasonable amount of time. The wax paper works good, I've got some Sig mold release wax that closely resembles clear shoe polish wax. Works great when fabricating the carbon plates between two sheets of aluminum, compresses it nicely.
    KF7TSE

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    Airtruksrus Cockpit Ground Station Systems.
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    Always under revision to make it better.

  3. #13
    Techpod designer Hobby UAV's Avatar
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    Ok I just got back from tap plastic. Got some PVA and carnauba wax. I will try doing it over a actual wing. If I like the results, I can make a more formal mold.

  4. #14
    Techpod designer Hobby UAV's Avatar
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    Ok I threw some 1/8th G 10 on the cnc and this is what I came up with.


    It cut pretty well. I am going to cut out the rest of the bulkheads and the spar box.

  5. #15
    Techpod designer Hobby UAV's Avatar
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    so i bagged up a wing. its cooking in the cure box.


    I also cut out a set of bulkhead, motor mount and spar box parts. turned out pretty good.

  6. #16
    Test pilot addict airtruksrus's Avatar
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    Looking really great, would almost bet the slight gain in structural weight would be insignificant to the longevity of the life of the airframe. As long as the surface is prepped right, that foam should stay put for a long time.

    Was able to mount the wheel support to the bulkhead that holds the spar clamp using a nose wheel bracket, rests on the c/g. Should protect the bottom and allow takeoffs from the runway.


    Last edited by airtruksrus; 25th January 2014 at 02:19 AM.
    KF7TSE

    youtube.com/channel/UCzoOpmJK8_WOlBl65sZAfGw
    vimeo.com/airtruksrus/videos

    Airtruksrus Cockpit Ground Station Systems.
    Open for business
    Always under revision to make it better.

  7. #17
    Techpod designer Hobby UAV's Avatar
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    I had quite a bit of issues trying to mold skins. Wax paper definitely does not work well. Molding over the foam wings was a disaster


    I cut out some butter board I had with the cnc. The mold came out very good.


    I am going to attempt to mold some skins over this tomorrow.

  8. #18
    Ouwe Zeikerd Carbon's Avatar
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    This thread is funny. "I sold an FPV plane that isn't suitable for FPV, here's how you can fix it."

  9. #19
    Techpod designer Hobby UAV's Avatar
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    Actually I should name it "how to make a piece of foam do the impossible"

  10. #20
    Is working on 12 projects Sicarius's Avatar
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    Quote Originally Posted by Carbon View Post
    This thread is funny. "I sold an FPV plane that isn't suitable for FPV, here's how you can fix it."
    I think that's an unfair statement.. If a plane isn't built for 70 mph dives then it simply isn't built for it, when control is lost, it's still at the pilot's discretion, as it's probably an error in installing the equipment.
    If I take my Z2 out in a full throttle dive and i slam the elevator, it probably folds in half.. You won't see me taking it out on Chris, but on myself
    Youtube username: SicariusMortus
    FPV NL

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