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Thread: Flying Project

  1. #81
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    Default

    I'm curious how you ended up with 4' rotor blades and what calculations did you follow for determining the airfoil's form other than making it look like a wing? How much thrust will the rotors create for your given rpm sweet spot?
    Syncrowave 250DX
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  2. #82
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    Quote Originally Posted by Fishy Jim View Post
    I'm curious how you ended up with 4' rotor blades and what calculations did you follow for determining the airfoil's form other than making it look like a wing? How much thrust will the rotors create for your given rpm sweet spot?
    Four foot rotors was a guess compared to looking at similar type units and that's the longest my cnc can move in the X axis. The shape of the rotor is based on the 8-H-12 airfoil. Don't know how much thrust yet as that will depend on rotor pitch, speed, rpm, and whether the engine is up to the task.
    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

  3. #83
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    Quote Originally Posted by Goodhand View Post
    I'm not following the scary part... just find a test pilot.

    BTW... Do you plan to free fly, once the rotors are attached, or have you considered suspending it between ropes, until you get the feel for it? The problems encountered with learning to fly a device intuitively are not only in controlling the vehicle's attitude, but also in controlling your excitement. Overcorrecting a change in attitude often leads to crashes.

    BTW2... You've done a remarkable job. I share your excitement. Continued success.
    It will be teathered down while running with rotors untill drive train etc prove
    to be ok. Then will try with a little slack.
    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

  4. #84
    Join Date
    Jan 2007
    Location
    Montana, USA
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    235

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    Quote Originally Posted by monte55 View Post
    It will be teathered down while running with rotors untill drive train etc prove
    to be ok. Then will try with a little slack.
    Not sure I can wait for the video of your first flying attempt... do you mind if I drive over to watch?

  5. #85
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    Quote Originally Posted by Goodhand View Post
    Not sure I can wait for the video of your first flying attempt... do you mind if I drive over to watch?
    I'm sure you're joking but early testing will be without spectators for safety reasons.
    Nick
    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

  6. #86
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    Quote Originally Posted by monte55 View Post
    I'm sure you're joking but early testing will be without spectators for safety reasons.
    Nick
    I've got binoculars.

  7. #87
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    Quote Originally Posted by Goodhand View Post
    I've got binoculars.
    So.........you're are pulling the old bino ploy? I get it
    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

  8. #88
    Join Date
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    Location
    Raymore Missouri
    Posts
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    Default Nicks heli short test

    I put the two lower rotor blades on the heli and did a short and limited
    rpm runup. First I noticed some vibration which I need to figure out. The
    centrifigual clutch has a spacer bearing that is like a sprague clutch for lack
    of better description. I'm not quite sure exactly what purpose it served in its
    4 wheeler application. Maybe for engine braking when the throttle was released.
    Anyway I reversed it on installation on the heli so only the clutch shoes would
    drive the rotors and not this bearing upon start up. The problem now is when I
    throttle down the engine which will slow down quickly, the rotors slowing down
    want to drive the engine if that makes any sense. They should free wheel but
    they tend to drive the engine and jerk the rotors and drive train a bit at shut
    down as can be seen in the video. This bearing has to go and I'll have to make a
    spacer bearing to replace this one. So as long as the clutch shoes are not
    expanded, the rotors are totally free of the drive system to rotate.
    Next....with only the lower rotors spinning, the gyro effect(rigidity in space)
    make changing the angle of the rotor head via the handle requiring more effort
    because of this effect. When I shut the engine down, the rotors should free
    wheel to a stop. Maybe the gyro effect will change when all four rotors are on
    and turning. They may cancel out each a bit. We'll see.
    Nick
    http://www.youtube.com/watch?v=PA-VpL0vAIo
    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

  9. #89
    Join Date
    Oct 2006
    Location
    Mpls, MN
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    1,790

    Default

    When you add more rotational mass, it will increase the gyroscopic effect - doesn't matter that they're opposing each other.
    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

  10. #90
    Join Date
    Aug 2006
    Location
    Raymore Missouri
    Posts
    1,920

    Default

    I realize the more weight and speed, the more gyro effect. I'm talking about a single rotating mass and the 90 degree effect when trying to move it from its plane of rotation. I wonder how the opposite 90 degree effect of the top rotor will effect 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

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