Ebay Today

Discussion in 'For Sale & Wanted' started by delta, Jun 12, 2014.

Help Support HomeBuiltAirplanes Forum by donating:

  1. Oct 3, 2019 #1941

    Hot Wings

    Hot Wings

    Hot Wings

    Well-Known Member HBA Supporter

    Joined:
    Nov 14, 2009
    Messages:
    6,304
    Likes Received:
    2,247
    Location:
    Rocky Mountains
  2. Oct 4, 2019 #1942

    rcflier

    rcflier

    rcflier

    New Member

    Joined:
    Aug 14, 2015
    Messages:
    3
    Likes Received:
    1
    Location:
    Nexø, Bornholm, Denmark, Europe
    Isn't it a 72" ?

    48" for one blade plus
    sin 30 deg (0.5) times 48" makes
    1.5 times 48" which is 72".

    Or am I all wrong here?

    Cheers
    Erik
     
    bmcj likes this.
  3. Oct 4, 2019 #1943

    Hot Wings

    Hot Wings

    Hot Wings

    Well-Known Member HBA Supporter

    Joined:
    Nov 14, 2009
    Messages:
    6,304
    Likes Received:
    2,247
    Location:
    Rocky Mountains
    Just going by what the vendor said.

    Edit: (48/2)*sin30 + 48 = 60

    Edit #2: Now I'm confused - and I don't drink coffee so the day is hosed. :oops:
     
    Last edited: Oct 4, 2019
    bmcj likes this.
  4. Oct 5, 2019 #1944

    delta

    delta

    delta

    Well-Known Member

    Joined:
    May 27, 2011
    Messages:
    1,896
    Likes Received:
    187
    Location:
    Brookside Utah
    The listing stated each blade was 29.5" which would give a 60" diameter with a 1" spacing from center. I don't know what he was measuring to come up with 45".
     
  5. Oct 5, 2019 #1945

    rv7charlie

    rv7charlie

    rv7charlie

    Well-Known Member

    Joined:
    Nov 17, 2014
    Messages:
    410
    Likes Received:
    155
    Location:
    Jackson
    You don't need trig; dia is 2X blade length.
     
  6. Oct 5, 2019 #1946

    Heavy Iron

    Heavy Iron

    Heavy Iron

    Member

    Joined:
    Aug 27, 2011
    Messages:
    6
    Likes Received:
    2
    Location:
    Dundalk, Ontario / Canada
    No serious trigonometry required here, the diameter of a circle is always twice the radius.
    29.5 inch blade will be a 59 inch diameter prop.
     
  7. Oct 5, 2019 #1947

    delta

    delta

    delta

    Well-Known Member

    Joined:
    May 27, 2011
    Messages:
    1,896
    Likes Received:
    187
    Location:
    Brookside Utah
    Where he got the 45"... Measure from the ground to the verticle tip as it leans against a tree...:rolleyes:
     
  8. Oct 5, 2019 #1948

    rcflier

    rcflier

    rcflier

    New Member

    Joined:
    Aug 14, 2015
    Messages:
    3
    Likes Received:
    1
    Location:
    Nexø, Bornholm, Denmark, Europe
    Sorry, I misread.

    As I read it (too quickly), the length of one blade was 48".

    I can now see, one blade is 29.5", so it's about 59" in dia. of course.

    I could've used that prop for the Gyrobee I'm building (slowly).

    It's a good price, even for a quite old one.

    But I already bought a new 60" Warp Drive - at quite another price.

    Sorry for creating the confusion.

    Cheers
    Erik
     
  9. Oct 7, 2019 #1949
  10. Oct 9, 2019 at 3:11 PM #1950

    delta

    delta

    delta

    Well-Known Member

    Joined:
    May 27, 2011
    Messages:
    1,896
    Likes Received:
    187
    Location:
    Brookside Utah
  11. Oct 12, 2019 at 3:29 PM #1951
  12. Oct 12, 2019 at 4:53 PM #1952

    N804RV

    N804RV

    N804RV

    Well-Known Member

    Joined:
    Jun 10, 2013
    Messages:
    153
    Likes Received:
    61
    Location:
    Mount Vernon, WA
    That Grob is an interesting find! If I didn't already have two projects going....
     

Share This Page

arrow_white