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  • monte55
    started a topic Flying Project

    Flying Project

    I saw this a while back and became very interested in it. It has counter rotating blades so no tail rotor is needed to compensate for torque.
    I am in communication with a gent in Belgium who is building a "backpack" helicopter. I'm trying to gather as much info as I can before starting construction. There are no plans.....just pictures. I had a Scorpion 1 heli back in the 80's. Repaired it but never flew it. This as you see is simple, it works, and no license is needed to fly.

    http://www.youtube.com/watch?v=f09_yvcASLM

    http://www.youtube.com/watch?v=Vp0WnZ-4Tqg

  • H80N
    replied
    Originally posted by monte55 View Post
    When you say mast, what are you referring to?...The 2" square mast as I call it or the 1" rotor shaft. No calcs were done. Just looked at a lot of other projects and came up with this.
    Monte
    was referring to the "Rotor Mast"

    You may find it useful to refer to Wayne Johnson's text "Helicopter Theory" it is pretty much the standard reference in rotary wing design...

    "Monumental text offers comprehensive, detailed coverage of every aspect of theory and design: elements of vertical flight, forward flight, performance, mathematics of rotating systems, rotary wing dynamics and aerodynamics, aeroelasticity, stability and control, more. Essential reading for those interested in design and development of vertical-flight aircraft. 189 illustrations. 1089 pages
    1980 edition."


    http://books.google.com/books?id=SgZheyNeXJIC

    there are lots of used copies available at reasonable prices...

    Leave a comment:


  • monte55
    replied
    When you say mast, what are you referring to?...The 2" square mast as I call it or the 1" rotor shaft. No calcs were done. Just looked at a lot of other projects and came up with this.

    Leave a comment:


  • H80N
    replied
    OK.... that spider gear setup is a simple elegant solution... Thanks!!

    The mast does look a little lightweight.... know the loading is way different.. but the ones on the Bell Jetrangers and Hughes 500's that I am used to are massive by comparison..... how did you calculate the loading on it??

    Leave a comment:


  • monte55
    replied
    http://youtu.be/MHQ4k3dKqtg

    Leave a comment:


  • H80N
    replied
    Contra Rotating Propellers

    Been seeing more and more contra rotating propellers in the radio controlled world and was wondering how your full sized project was coming along.... was also wondering if you might share some pics of the gearbox scheme you used to achieve the contra rotation...

    Leave a comment:


  • Bert
    replied
    Just wanted to reiiterate (sp?) on what I told you before and what others have said: BE CAREFUL!!! We'd hate to lose you........

    Leave a comment:


  • monte55
    replied
    Originally posted by kiwi View Post
    Nick,
    Thanks for the videos, they are great. So what is the next test? Did you notice much lift during your test? How much throttle did you use? Keep it up and good luck.
    Nick
    The rotors are at 0 degree pitch now so no lifting. I am in the process of making 8 degree wedge shims to give the rotors positive pitch. It's a starting point and I'll see what happens. Btw...so far throttle has been on the low side.
    Nick
    Last edited by monte55; 03-29-2010, 06:31 AM.

    Leave a comment:


  • Goodhand
    replied
    Originally posted by MrBill View Post
    One of the biggest issues I see is it will not be instinctive to fly with the control system that you are using. Push left to go right, pull back to go forward.
    Pretty much the same as flying a hang glider. Or, guiding an auto by grasping the steering wheel below center.

    It's intuitive, once you're airborne.

    Leave a comment:


  • MrBill
    replied
    One of the biggest issues I see is it will not be instinctive to fly with the control system that you are using. Push left to go right, pull back to go forward.
    A very ambitious project. Be careful.

    Leave a comment:


  • Rick C
    replied
    Nick,
    Can I put a life insurance policy on you? It might pay well with that contraption!!!!
    One thing I would do is put a shield on the drive shaft if I was you. You have a lot of trust in your work.
    Rick C.

    Leave a comment:


  • kiwi
    replied
    Nick,
    Thanks for the videos, they are great. So what is the next test? Did you notice much lift during your test? How much throttle did you use? Keep it up and good luck.
    Nick

    Leave a comment:


  • Matt_in_Brooklyn
    replied
    Wow

    I will echo earlier comments and say that is one of the craziest things I've seen on this board. I see you wear a lot of different hats, I didn't think Test Pilot was one of them. Please stay safe.

    Matt.

    Leave a comment:


  • monte55
    replied
    New videos on Monte's heli project

    Well now that the weather is warming up some I thought it's time to do more
    testing with the heli project. I uploaded 2 new videos of running up the engine
    and drive train with all 4 rotors installed. I still have a lot to figure out. This is for the ones that requested updates on my progress.
    Nick

    http://www.youtube.com/watch?v=SoPOlKnJFwA

    http://www.youtube.com/watch?v=-df8RKaa_h8

    Leave a comment:


  • m.k.swelding
    replied
    now I thougth I had seen it all.

    Leave a comment:

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