Likes Likes:  0
Page 3 of 3 FirstFirst 123
Results 31 to 42 of 42

Thread: RE: Kasperwing UL

  1. #31
    Registered User
    Join Date
    Sep 2012
    Location
    Brookville, NY. USA
    Posts
    2,118
    Likes (Given)
    191
    Likes (Received)
    237

    Re: Kasperwing UL

    Thanks for the making it clear norman.

    Just one more dumb question. Is 1/4 chord assumed as the rotating axis on the Cm diagram?

  2. #32
    Registered User Norman's Avatar
    Join Date
    Nov 2003
    Location
    Grand Junction, Colorado
    Posts
    2,635
    Likes (Given)
    497
    Likes (Received)
    713

    Re: Kasperwing UL

    Quote Originally Posted by Aviator168 View Post
    Is 1/4 chord assumed as the rotating axis on the Cm diagram?
    Yes. And the offset between the assumed AC at 1/4c and the actual AC is what causes the linear part of the curve to be sloped. If you were to test an airfoil in a wind tunnel with the axis of rotation at the corrected AC position the pitching moment would be constant within the linear range and the linear part of the data curve would be horizontal. For conventional airplanes the actual AC is not important because the moment produced by the horizontal stabilizer is an order of magnitude larger than a 2% error in the AC position but it can be critical for flying wings because that error can be 1/2 of your static margin (much more if the airfoil is particularly pathological as in the example I used in the spreadsheet).
    -------.~.
    -------/V\
    -----//----\\
    ----/(------)\
    -(^^)---(^^) -Norm
    We didn't throw the tail away, we just hid it

  3. #33
    Registered User
    Join Date
    Dec 2010
    Location
    North America, Earth, Milky Way Galaxy
    Posts
    46
    Likes (Given)
    0
    Likes (Received)
    6

    Re: Kasperwing UL

    Kasperwing Ultralight for sale down under.

    http://www.gumtree.com.au/s-ad/yello...ing/1126791460

  4. #34
    Registered User Beragoobruce's Avatar
    Join Date
    Oct 2014
    Location
    Blue Mountains, AUSTRALIA
    Posts
    44
    Likes (Given)
    6
    Likes (Received)
    28

    Re: Kasperwing UL

    The Pterodactyl was very similar to the Kasperwing. I built a Pterodactyl in 1979, and later modified it to aerodynamic pitch control by extending the hang cage forward and making a small (5 square foot or so) symmetrical profile canard, operated by a joystick.

    Jack McCornack offered this mod with a big floppy flat fabric canard (approx 10 sq.ft) as per photo: https://c1.staticflickr.com/3/2640/5...8bf61997_z.jpg
    You might be able to do something similar.

    Bruce

  5. #35
    Registered User
    Join Date
    Mar 2010
    Location
    krakow,poland
    Posts
    3,582
    Likes (Given)
    426
    Likes (Received)
    312

    Re: Kasperwing UL

    Quote Originally Posted by Beragoobruce View Post
    The Pterodactyl was very similar to the Kasperwing. I built a Pterodactyl in 1979, and later modified it to aerodynamic pitch control by extending the hang cage forward and making a small (5 square foot or so) symmetrical profile canard, operated by a joystick.

    Jack McCornack offered this mod with a big floppy flat fabric canard (approx 10 sq.ft) as per photo: https://c1.staticflickr.com/3/2640/5...8bf61997_z.jpg
    You might be able to do something similar.

    Bruce
    -PTERODACTYL is MANTA FLEDGE wing + canard stabilizer...

    -KASPERWINGs stabilisers are triangular extensions at wingtips.

    \NO need in tail or duck !\

  6. #36
    Registered User
    Join Date
    Sep 2012
    Location
    Brookville, NY. USA
    Posts
    2,118
    Likes (Given)
    191
    Likes (Received)
    237

    Re: Kasperwing UL

    -KASPERWINGs stabilisers are triangular extensions at wingtips.
    Do you mean the rudders at the wingtips?

  7. #37
    Registered User Norman's Avatar
    Join Date
    Nov 2003
    Location
    Grand Junction, Colorado
    Posts
    2,635
    Likes (Given)
    497
    Likes (Received)
    713

    Re: Kasperwing UL

    Quote Originally Posted by Aviator168 View Post
    Do you mean the rudders at the wingtips?
    He's referring to the trailing edge extension of the wing tip not the vertical fin. The original BKB was found to need a bit more reflex near the tip for pitch trim so this extension was added. The feature was retained in the Kasperwing.
    -------.~.
    -------/V\
    -----//----\\
    ----/(------)\
    -(^^)---(^^) -Norm
    We didn't throw the tail away, we just hid it

  8. #38
    Registered User
    Join Date
    Sep 2012
    Location
    Brookville, NY. USA
    Posts
    2,118
    Likes (Given)
    191
    Likes (Received)
    237

    Re: Kasperwing UL

    Quote Originally Posted by Norman View Post
    He's referring to the trailing edge extension of the wing tip not the vertical fin. The original BKB was found to need a bit more reflex near the tip for pitch trim so this extension was added. The feature was retained in the Kasperwing.
    Ah, I see. Was wondering with full span reflex, why there was a bit of extension at the wing tip.

    Edit. Now I am wondering. What's more efficient, a traditional flying wing or a kasperwing. Adding a bit more reflex near the tip makes it more like a traditional flying wing.

  9. #39
    Registered User
    Join Date
    Mar 2010
    Location
    krakow,poland
    Posts
    3,582
    Likes (Given)
    426
    Likes (Received)
    312

    Re: Kasperwing UL

    Quote Originally Posted by Aviator168 View Post
    Ah, I see. Was wondering with full span reflex, why there was a bit of extension at the wing tip.

    Edit. Now I am wondering. What's more efficient, a traditional flying wing or a kasperwing. Adding a bit more reflex near the tip makes it more like a traditional flying wing.
    1-triangular stabilisers =moore chord,last airfoils are thiner =aerodynamic twist.
    2-moore damphing phactor=tuck and autorotation resist!

    https://www.youtube.com/watch?v=ZW7oeSm7zZ0

  10. #40
    Registered User
    Join Date
    Dec 2010
    Location
    North America, Earth, Milky Way Galaxy
    Posts
    46
    Likes (Given)
    0
    Likes (Received)
    6

    Re: Kasperwing UL

    Henyrk,

    A historical note on vertical parachuting the Kasperwing 180-B U/L, there has been discursion on the internet that does not accurately depict the event.

    Against my strong protest Steve Grossruck mushed (parachuted) his Kasperwing 180-B from 1,000 agl to Issaquah Sky Port's grass airfield. I witnessed the event, I would warn others, DO NOT ATTEMPT THIS STUNT. The aircraft was completely destroyed, Steve suffered a painful injury to his leg and ankle, he was standing on the fuselage lower tube on impact, the collapsing landing gear, airframe and his legs absorbed most of the impact, had he been in the normal sitting position he certainly would have fractured his spine. Very little of the ultralight could be salvaged, the sail, kingpost, upper rigging, spars, fuselage, landing gear and prop were all scrapped. Only the wheels, wingtips, seat, steering yoke, engine and PSRU survived to be reused to rebuild the aircraft. At the time of the incident Steve weighed approx. 155 lbs., the aircraft was the stock B model configuration. Again I must warn those that might attempt to repeat this stunt, mushing fully to the ground in a KW 180 ultralight will result in serious injury and very likely death. Steve always minimized the seriousness of the incident when he related the event to others and years later admitted it was a very costly and foolhardy mistake.

  11. #41
    Registered User
    Join Date
    Dec 2010
    Location
    North America, Earth, Milky Way Galaxy
    Posts
    46
    Likes (Given)
    0
    Likes (Received)
    6

    Re: Kasperwing UL

    Ultralight Flyer featuring the Kasperwing 180

    https://www.youtube.com/watch?v=-_edUgD7BW8

  12. #42
    Registered User
    Join Date
    Mar 2010
    Location
    krakow,poland
    Posts
    3,582
    Likes (Given)
    426
    Likes (Received)
    312

    Re: Kasperwing UL

    Quote Originally Posted by Highflight View Post
    Ultralight Flyer featuring the Kasperwing 180

    https://www.youtube.com/watch?v=-_edUgD7BW8
    -who know ,why Steve Pinkham got the GRAND CHAMPION Oshkosh?

    "17. "An Antique Grand Champion Ultralight", by Mary Jones, SPORT AVIATION, January 1996, pp. 81-84. Steve Pinkham's Kasperwing celebrates ultralighting's early days."

Similar Threads

  1. [Wanted] Kasperwing in any condition / any location
    By danmoser in forum For Sale / Wanted
    Replies: 2
    Last Post: January 28th, 2013, 11:58 AM
  2. Advice on Kasperwing value..
    By ChrisR in forum The light stuff area
    Replies: 4
    Last Post: January 7th, 2013, 03:49 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •