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Thread: Building the worlds fastest fpv plane

  1. #31
    Navigator InvertedG-Force's Avatar
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    So are you currently making "dumby parts" to make female molds from?


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  2. #32
    Co-Pilot Håvard Støre's Avatar
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    Quote Originally Posted by InvertedG-Force View Post
    So are you currently making "dumby parts" to make female molds from?
    Yes. I believe it's the way forward for faster fpv.

    Its scary though. Never done any composite fabrication before. Watched hundreds of hours on youtube, and I believe I will succeed on my first attempt. As mentioned in the beginning of this thread, the purpose of the plane is to shoot cool, low high speed video. Any speed record will just be a bonus.

  3. #33
    Fretsaw Jedi Roboforcer X2000's Avatar
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    Quote Originally Posted by Håvard Støre View Post
    Never done any composite fabrication before
    You're doing great, that's the way to do it properly, of course if you will use vacuum bagging I did loads of RC boat hulls when I was racing in FSR-V class in my teenage years, and one suggestion I'd give- don't cut corners on preparing the mold as all the imperfections will be visible later. If you do it right (that is release spray + paint + GF layers) then you won't need even painting it, but if the mold won't be as smooth as baby's arse, then fine finish will have a penalty of weight due to filler, primer and paint.
    Quote Originally Posted by InvertedG-Force View Post
    "dumby parts"
    They're known as negative molds
    If you're a noob, copy 1:1 what somebody already flies without too much questions, you'll find the answers later.
    PatrikE: I don't see anything wrong in your dump...
    Derrick:
    you are flying it LOS... You are doing it wrong.

  4. #34
    Co-Pilot Håvard Støre's Avatar
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    Thanks for the advice Robo:-) Somehow I was not surprised that you have done composite work. I assume you like myself have been building stuff all your life. I will try to make the parts/molds flat and smooth. Bought some car polish today as a final step before the layers of wax. I will post a picture of the arse smooth wing/fuse plug later.

  5. #35
    Navigator InvertedG-Force's Avatar
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    I have done composite work, but not with vacuum bagging. Just layups on molds.


    Quote Originally Posted by Roboforcer X2000 View Post

    They're known as negative molds
    Yea.. I couldn't come up with it last night. Lol.



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  6. #36
    Co-Pilot Håvard Støre's Avatar
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    Quote Originally Posted by InvertedG-Force View Post
    I have done composite work, but not with vacuum bagging. Just layups on molds.
    Feel free to share advice or pointers. I am new at this.

    Quote Originally Posted by Roboforcer X2000 View Post

    They're known as negative molds
    They are also often called plugs.

    Completed fuse wing plug and some gear. The motor will pull around 1300w on a 4,7x4,7. It will pull 2000watts+ on 6x6 prop. I wish I could get propellers with higher than square pitch. That would make a world record easy. Any tips on high pitch propellers? Something like 5x7 should work much better on a fast airframe.
    Click image for larger version. 

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  7. #37
    Young Skywalker Rfriedman's Avatar
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    Not sure how much you have used Emax servos, but the few ones I used had a lot of gear slop. I really love the dymond D60 servos on my pylon racer though.

    Also, APC sells over-square props. Here's an example:
    http://www3.towerhobbies.com/cgi-bin...P?I=LXSML1&P=8

  8. #38
    Co-Pilot Håvard Støre's Avatar
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    Quote Originally Posted by Rfriedman View Post
    Not sure how much you have used Emax servos, but the few ones I used had a lot of gear slop. I really love the dymond D60 servos on my pylon racer though.

    Also, APC sells over-square props. Here's an example:
    http://www3.towerhobbies.com/cgi-bin...P?I=LXSML1&P=8
    Agree with you on the servos. Too sloppy.

    Thanks for the link about over square propellers. Searched and couldn't find any. I will get some. Thanks bro

  9. #39
    Co-Pilot Håvard Støre's Avatar
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    This looks very promising. Don't know how accurate ecalc is at these speeds. Take a look at these numbers guys!
    Click image for larger version. 

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  10. #40
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    top right has a wing area spot. 50dm^2 is default. If you lower it, the speed will go up. Not sure how accurate it is though. Anyways, point is you may want to lower that.

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