B-17 chin turret question

Discussion in 'Technical Requests' started by Hoggardhigh, Aug 14, 2017.

  1. Hoggardhigh

    Hoggardhigh Member

    Joined:
    Jan 6, 2014
    Messages:
    45
    Likes Received:
    1
    Trophy Points:
    8
    Ratings:
    +1 / 0 / -0
    Hi all,

    I recently received a copy of Roger Freeman's "The B-17 Flying Fortress Story", and on page 55 of the book Freeman writes the following for the final B-17F production block (B-17F-130-BO): "Reinforcement of lower nose for chin turret added..."

    Can someone describe the quoted modification in more detail? What specific modifications were undertaken to adapt the B-17F airframe to take the Bendix chin turret?

    Thanks
     
  2. fubar57

    fubar57 Well-Known Member

    Joined:
    Nov 22, 2009
    Messages:
    13,334
    Likes Received:
    1,613
    Trophy Points:
    113
    Occupation:
    Heavy Equipment Operator
    Location:
    Jungles of Canada
    Ratings:
    +2,323 / 2 / -2
    Don't know what the modifications were but the chin turret was developed for the YB-40 gunships starting with the second production B-17F-1-BO (serial number 41-24341), conversion done at the Vega plant. The production version started with the last 86 Douglas built B-17F-75-DL production block and carried on into the G variant. I'll see if I can find the mods
     
  3. Hoggardhigh

    Hoggardhigh Member

    Joined:
    Jan 6, 2014
    Messages:
    45
    Likes Received:
    1
    Trophy Points:
    8
    Ratings:
    +1 / 0 / -0
    Before you do, can you see if FLYBOYJ has anything to say about it?
     
  4. Hoggardhigh

    Hoggardhigh Member

    Joined:
    Jan 6, 2014
    Messages:
    45
    Likes Received:
    1
    Trophy Points:
    8
    Ratings:
    +1 / 0 / -0
    Did you find any information on the chin turret modifications yet?
     
  5. fubar57

    fubar57 Well-Known Member

    Joined:
    Nov 22, 2009
    Messages:
    13,334
    Likes Received:
    1,613
    Trophy Points:
    113
    Occupation:
    Heavy Equipment Operator
    Location:
    Jungles of Canada
    Ratings:
    +2,323 / 2 / -2
    No, pretty much everything I have states the same. Maybe if you can find some maintenance manuals of each variant they might show the differences
     
  6. fubar57

    fubar57 Well-Known Member

    Joined:
    Nov 22, 2009
    Messages:
    13,334
    Likes Received:
    1,613
    Trophy Points:
    113
    Occupation:
    Heavy Equipment Operator
    Location:
    Jungles of Canada
    Ratings:
    +2,323 / 2 / -2
  7. fubar57

    fubar57 Well-Known Member

    Joined:
    Nov 22, 2009
    Messages:
    13,334
    Likes Received:
    1,613
    Trophy Points:
    113
    Occupation:
    Heavy Equipment Operator
    Location:
    Jungles of Canada
    Ratings:
    +2,323 / 2 / -2
  8. Hoggardhigh

    Hoggardhigh Member

    Joined:
    Jan 6, 2014
    Messages:
    45
    Likes Received:
    1
    Trophy Points:
    8
    Ratings:
    +1 / 0 / -0
  9. Hoggardhigh

    Hoggardhigh Member

    Joined:
    Jan 6, 2014
    Messages:
    45
    Likes Received:
    1
    Trophy Points:
    8
    Ratings:
    +1 / 0 / -0
    By the way, I'm assuming that the "reinforcement" in question consisted simply of a removable opening in the lower nose section for the chin turret installation. Does anyone know if this is correct?
     
  10. Wurger

    Wurger Siggy Master
    Staff Member Administrator

    Joined:
    Jun 19, 2005
    Messages:
    53,760
    Likes Received:
    3,467
    Trophy Points:
    113
    Occupation:
    A retired military Navigator/ATC, FIS controller
    Location:
    Poland
    Ratings:
    +4,875 / 2 / -1
  11. Hoggardhigh

    Hoggardhigh Member

    Joined:
    Jan 6, 2014
    Messages:
    45
    Likes Received:
    1
    Trophy Points:
    8
    Ratings:
    +1 / 0 / -0
  12. wuzak

    wuzak Well-Known Member

    Joined:
    Jun 5, 2011
    Messages:
    4,523
    Likes Received:
    234
    Trophy Points:
    63
    Location:
    Hobart Tasmania
    Ratings:
    +358 / 1 / -1
    I believe the pic shows the support ring for the turret inside the fuselage.
     
  13. Wurger

    Wurger Siggy Master
    Staff Member Administrator

    Joined:
    Jun 19, 2005
    Messages:
    53,760
    Likes Received:
    3,467
    Trophy Points:
    113
    Occupation:
    A retired military Navigator/ATC, FIS controller
    Location:
    Poland
    Ratings:
    +4,875 / 2 / -1
    #13 Wurger, Sep 11, 2017
    Last edited: Sep 11, 2017
    Yes, that's it. The support ring with its internal ( or if you wish , external ) stiffeners what can be noticed looking at the rivet lines. Also the floor at the compartment was reinforced by adding a ring at the round edge of the hole for attaching of the support arms of the rotation mechanism.. What is more the floor was joined to the support ring with a couple of channel bars and bolts.

    A - the internal ( external ) stiffener
    B - the reinforcing ring with bolts
    C - rivets/bolts

    Chin-Turret.jpg
     
    • Like Like x 1
  14. Old Wizard

    Old Wizard Well-Known Member

    Joined:
    Mar 26, 2008
    Messages:
    5,205
    Likes Received:
    298
    Trophy Points:
    83
    Location:
    Lethbridge AB
    Ratings:
    +363 / 1 / -1
Loading...

Share This Page