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  • #91
    I could be wrong here, but I don't think the rotors opposing directions will negate the torque vectors to the point it will be easier to bump the gyros out of plane. The reason airplane engines are canted at 10 degrees off center is due to the torque vector, but that doesn't eliminate the the gyroscopic precession - it merely prevents it from having as large an impact on the aircraft's tendency to yaw because of it.

    A way to find out your chances, would be to look up a twin opposing prop airplane and see if the engine is mounted in line with center or skewed. If it's in line, you're in luck. If it's canted, you're probably screwed (or at least going to have a lot of physical effort to fly your machine).
    Syncrowave 250DX
    Invison 354MP
    XR Control and 30A

    Airco MED20 feeder
    Thermal Dynamics Cutmaster 81
    Smith O/A rig
    And more machinery than you can shake a 7018 rod at

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    • #92
      now I thougth I had seen it all.

      Comment


      • #93
        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
        Nick
        Miller 252 Mig
        Miller Cricket XL
        Millermatic 150 Mig
        Miller Syncrowave 200 Tig
        2-O/A outfits
        Jet Lathe and Mill
        Jet 7x12 horz/vert band saw
        DeWalt Multi Cutter metal saw
        Century 50 Amp Plasma Cutter
        20 ton electric/hydraulic vertical press
        Propane Forge
        60" X 60" router/plasma table

        www.youtube.com/watch?v=jTu7wicVCmQ
        Vist my site: www.nixstuff.com
        and check out some of my ironwork and other stuff

        Comment


        • #94
          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.
          "A little bit of knowledge is a dangerous thing"

          Millermatic 135
          Milwaukee 14" Dry Cut Saw
          Milwaukee Deep Cut Band
          Fully charged fire extinguisher

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          • #95
            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

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            • #96
              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.

              Comment


              • #97
                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.

                Comment


                • #98
                  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.

                  Comment


                  • #99
                    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.
                    Nick
                    Miller 252 Mig
                    Miller Cricket XL
                    Millermatic 150 Mig
                    Miller Syncrowave 200 Tig
                    2-O/A outfits
                    Jet Lathe and Mill
                    Jet 7x12 horz/vert band saw
                    DeWalt Multi Cutter metal saw
                    Century 50 Amp Plasma Cutter
                    20 ton electric/hydraulic vertical press
                    Propane Forge
                    60" X 60" router/plasma table

                    www.youtube.com/watch?v=jTu7wicVCmQ
                    Vist my site: www.nixstuff.com
                    and check out some of my ironwork and other stuff

                    Comment


                    • Just wanted to reiiterate (sp?) on what I told you before and what others have said: BE CAREFUL!!! We'd hate to lose you........
                      I'm not late...
                      I'm just on Hawaiian Time

                      Comment


                      • 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...
                        .

                        *******************************************
                        The more you know, The better you know, How little you know

                        “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

                        Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

                        My Blue Stuff:
                        Dynasty 350DX Tigrunner
                        Dynasty 200DX
                        Millermatic 350P w/25ft Alumapro & 30A
                        Millermatic 200

                        TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam w/ PowerMax-1000

                        Comment


                        • http://youtu.be/MHQ4k3dKqtg
                          Nick
                          Miller 252 Mig
                          Miller Cricket XL
                          Millermatic 150 Mig
                          Miller Syncrowave 200 Tig
                          2-O/A outfits
                          Jet Lathe and Mill
                          Jet 7x12 horz/vert band saw
                          DeWalt Multi Cutter metal saw
                          Century 50 Amp Plasma Cutter
                          20 ton electric/hydraulic vertical press
                          Propane Forge
                          60" X 60" router/plasma table

                          www.youtube.com/watch?v=jTu7wicVCmQ
                          Vist my site: www.nixstuff.com
                          and check out some of my ironwork and other stuff

                          Comment


                          • 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??
                            .

                            *******************************************
                            The more you know, The better you know, How little you know

                            “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

                            Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

                            My Blue Stuff:
                            Dynasty 350DX Tigrunner
                            Dynasty 200DX
                            Millermatic 350P w/25ft Alumapro & 30A
                            Millermatic 200

                            TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam w/ PowerMax-1000

                            Comment


                            • 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.
                              Nick
                              Miller 252 Mig
                              Miller Cricket XL
                              Millermatic 150 Mig
                              Miller Syncrowave 200 Tig
                              2-O/A outfits
                              Jet Lathe and Mill
                              Jet 7x12 horz/vert band saw
                              DeWalt Multi Cutter metal saw
                              Century 50 Amp Plasma Cutter
                              20 ton electric/hydraulic vertical press
                              Propane Forge
                              60" X 60" router/plasma table

                              www.youtube.com/watch?v=jTu7wicVCmQ
                              Vist my site: www.nixstuff.com
                              and check out some of my ironwork and other stuff

                              Comment


                              • 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...
                                .

                                *******************************************
                                The more you know, The better you know, How little you know

                                “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

                                Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

                                My Blue Stuff:
                                Dynasty 350DX Tigrunner
                                Dynasty 200DX
                                Millermatic 350P w/25ft Alumapro & 30A
                                Millermatic 200

                                TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam w/ PowerMax-1000

                                Comment

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