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Thread: The Ranger, an easily built high wing LSA runabout

  1. #256
    Registered User pwood66889's Avatar
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    Re: The Ranger, an easily built high wing LSA runabout

    Quote Originally Posted by FritzW View Post
    Almost all 1/8", there's a little 1/16" and there might be a little odd sized ply on the spar carry throughs if I have to make up some thickness. Won't know until I get started on the wing.
    `Preesh. Noodling using the LePelican wings. Also the 3-inch main tube.

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  3. #257
    Registered User FritzW's Avatar
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    Re: The Ranger, an easily built high wing LSA runabout

    I'd be happy to send you the DXF's for the wood but they're going to change a time or two before this is ready. ...better to let me cut one out first and see what needs to be changed (something always needs to be changed).

    Hopefully I'll get to start on the real fuselage this weekend. ...now I just have to find a place to build it
    Iēsous Christos, Theou Yios, Sōtēr

  4. #258
    Registered User rtfm's Avatar
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    Re: The Ranger, an easily built high wing LSA runabout

    No worries mate.
    ====================
    Brisbane, Australia

  5. #259
    Registered User Victor Bravo's Avatar
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    Re: The Ranger, an easily built high wing LSA runabout

    Quote Originally Posted by FritzW View Post
    and see what needs to be changed (something always needs to be changed).
    Well, now that you mention it, I was wondering how you were planning to install the aileron torque tube bellcrank through the slot shown in the tailboom under the seat. Assuming that the bellcrank is welded to the torque tube, from the early renderings it looks like you will either have to insert the welded assembly through the slot in the tailboom, or through the front end of the tailboom... or else you were gonna have to weld that bellcrank onto the torque tube while it is inside the tailboom. None of those options seem attractive to me .

    One way to address (or sidestep) this interference is to have the forward end of the tailboom stop just behind where the aileron bellcrank is. This eliminates the interference or "impossible assembly", but it means that you will not be able to get any "help" supporting the tailboom from the forward fuselage bulkhead as it is drawn now. All of the tailboom loads will have to be supported by the seat bulkhead and the lower rear fuselage closure bulkhead. Having part of the tailboom under the seat is nice from a crush-zone and pilot-protection standpoint, but it will sure play hell with installing the control system.

    The only other alternative I can see is to have the aileron torque tube mounted underneath the tailboom, and have the elevator push-pull rod attached to the stick assembly slightly above the axis of torque tube rotation. This will allow the push-pull tube to live inside the tailboom, but it will limit the side-to-side stick travel.
    "Everything in this book may be wrong."
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    "Common sense is so rare today, it should be reclassified as a superpower!"
    Derswede


  6. #260
    Registered User FritzW's Avatar
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    Re: The Ranger, an easily built high wing LSA runabout

    Why would you assume the bellcrank was welded?
    Iēsous Christos, Theou Yios, Sōtēr

  7. #261
    Registered User Victor Bravo's Avatar
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    Re: The Ranger, an easily built high wing LSA runabout

    Standard, conservative, safe practice for primary controls on aircraft that are meant for utility service.

    What did you have in mind for the joint between the torque tube and the bellcrank? Shear bolt... taper pin... splined shaft?

    (edit 1) Woodruff Key, square nesting tubes ?

    (edit 2) Maybe weld a 1/2 inch square drive off of a ratchet extension onto the torque tube, and weld a socket with a 1/2" drive on to the bellcrank, then slide the torque tube in through the tailboom until it mates with the socket... then drive a roll pin through them?
    Last edited by Victor Bravo; March 14th, 2019 at 02:34 AM.
    "Everything in this book may be wrong."
    Richard Bach, Illusions

    "Common sense is so rare today, it should be reclassified as a superpower!"
    Derswede


  8. #262
    Registered User rtfm's Avatar
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    Re: The Ranger, an easily built high wing LSA runabout

    Hi Fritz,
    Since the airfoil shape is already part of the fuselage roof, may I ask what airfoil you will be using?

    Cheers,
    Duncan
    ====================
    Brisbane, Australia

  9. #263
    Registered User FritzW's Avatar
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    Re: The Ranger, an easily built high wing LSA runabout

    rtfm,
    The 'roof' of the fuselage isn't the same size or shape as the wing airfoil. It's the size and shape of 5 gallons of gas stuffed between the spar carry throughs. The airfoil of the wing is a 4415, I'd bet your AeroMax wing is also. I'll try to post some DXF's of the fuselage ply.


    VB,
    The aileron torque tube and the elevator push/pull tube are coaxial. The aileron bellcrank will bolt to a flange that's welded on the aft end of the torque tube, the stick is mounted on the front end. The torque tube is mounted in two Delrin "bulkheads" that bolt inside the tail boom.

    ...and you can't cut the tail boom off where you suggested because the area behind and below the seat needs the tube to handle landing loads.
    Iēsous Christos, Theou Yios, Sōtēr

  10. #264
    Registered User FritzW's Avatar
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    Re: The Ranger, an easily built high wing LSA runabout

    The glue on the mock up was dry this morning so I gave it a try.

    Click image for larger version. 

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ID:	79126 With no seat and no helmet, even at 6'2", 252 lbs, size (US) 14, there would almost be too much room (extra room is just extra weight)

    Click image for larger version. 

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ID:	79127 With a 1" seat and a helmet it's just right. (...and no, that's not the helmet I really use)

    The shoulder harness will attach to the rear pylon bulkhead high enough so it doesn't compress your spine in a crash. The lap belt will attach at the strut fitting. There's plenty of room for the stick but the instruments probably shouldn't be stacked on the center line like I have them.


    >>>and my obligatory drift into faded glory...

    Click image for larger version. 

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ID:	79129 Joan Jett autographed my helmet on a trip from Balad to Baghdad. She was great about doing USO tours.
    Iēsous Christos, Theou Yios, Sōtēr

  11. #265
    Registered User rtfm's Avatar
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    Re: The Ranger, an easily built high wing LSA runabout

    Congratulations on fitting into the cabin. The fuse sure looks impressive.
    I plan to use my mini iPad as an instrument cluster. Another item I already own.
    NACA 4415 - I'll check it out...

    Cheers, and have a good weekend.

    Duncan
    ====================
    Brisbane, Australia

  12. #266
    Registered User Victor Bravo's Avatar
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    Re: The Ranger, an easily built high wing LSA runabout

    Now you have to cut out a full size foam mock-up of Erkki67 and see if it fits in the foam mock-up of the Ranger. Boy that'll make his whole day if it has enough room for him.
    "Everything in this book may be wrong."
    Richard Bach, Illusions

    "Common sense is so rare today, it should be reclassified as a superpower!"
    Derswede


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  14. #267
    Registered User erkki67's Avatar
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    Re: The Ranger, an easily built high wing LSA runabout

    Hey Fritz, and what about sticks, plywood and foam in the Ranger?

    Rgds

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    Registered User erkki67's Avatar
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    Re: The Ranger, an easily built high wing LSA runabout

    There is not enogh foam on the planet to reproduce my sexy body

  16. #269
    Registered User pwood66889's Avatar
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    Re: The Ranger, an easily built high wing LSA runabout

    Quote Originally Posted by erkki67 View Post
    There is not enogh foam on the planet to reproduce my sexy body
    No Doubt... :-)

  17. #270
    Registered User rtfm's Avatar
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    Re: The Ranger, an easily built high wing LSA runabout

    Hi Fritz,
    Any chance of a side-view drawing of the complete plane, with a few measurements? A jpeg would be fine. I'd like to draw the side view in Sketchup, and begin putting together a weight and balance SS. I'm a bit worried about the 112lb weight of the Generac I plan to use.

    Cheers,
    Duncan
    ====================
    Brisbane, Australia

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