Lollipop (oz14847)

 

Lollipop (oz14847) by Bill Bowne 2023 - plan thumbnail

About this Plan

Lollipop. Radio control sport biplane model, for electric power. Wingspan 34.25 in, wing area 410 sq in. Foam construction.

Direct submission to Outerzone.

Quote: "This is the last design I'll be submitting for a while. I have a new design underway, but it won't be ready for a few months."

See supplement Build_notes file for full build instructions.

Quote: "Lollipop came about as a replacement for my wife’s beloved Budgie (oz14384) biplane, lost in a landing mishap. To avoid dealing with the complexities of cabane struts, I decided to make the Lolli a cabin biplane. The foam I used is a mix of white 6mm Model Plane Foam (MPF) and household insulation foam (HIF, in both green and pink). I hot-wire cut the HIF to 1/8” and ¼” thicknesses, plus the wing cores were cut from green HIF.

To strengthen and seal the foam, the wing was covered with brown package-wrapping paper (lighter than brown grocery sack paper), with the rest of the model covered with blank newsprint. For applying the paper, I use a 50/50 mix of Titebond II aliphatic glue and tap water (Officially known as ‘Glue Glop” :-)).

All construction glue is either clear Gorilla NON-foaming polyurethane glue (GG), Titebond II aliphatic, or Foam-Cure (FC) glues. The ONLY place I used CYA is on the sewn-on tailwheel strut (later replaced by a commercial steerable tailwheel bracket). Yes, it does take longer to let the GG and FC glues cure, but they work much better than CYA on foam. If you plan on using any CYA, make sure any accelerator used doesn’t attack the foams – many are foam safe on some foam, but not on HIF.

Please refer to the attached article on covering foam with paper. If you have suggestions on how to do it better, please, tell me!

As we plan to eventually fly the Lollipop at a club Float Fly, I also built a set of floats for it and will include those in this article – but, as of this writing, we’ve yet to fly Lolli off those floats.

Wings: Cut the cores by your preferred method, sand them, smooth, round the tips, and cut out the ailerons and the top wing LE center. Cover the aileron bay TE and the wing tips with newsprint and Glue Glop. After they dry, cover the rest with wet brown paper and Glue Glop. Bevel sand the wing roots, add the dowel plates (2), and join them with FC or GG. Once they’re dry, sand the dowel braces flush with the wing top and Glue Glop on the diamond spars and center-section strip. Add the aileron torque rods and servo tray to the top wing.

Tail and Control Surfaces: These are pretty easy to do, so let’s get them done now and have them ready. The ailerons you’ve already cut from the top wing; the Elevator and Rudder are cut from ¼” foam and don’t need tapering. Glue the balsa control horn/ torque rod blocks into the ailerons and rudder; glue the bass (or spruce, if you can find it) elevator joiner and horn platform into the elevators.

Sand the control surface LEs to a “V” bevel and notch the aileron LEs for the torque rods. Round the fin and tailplane LEs. Cover the fin and tailplane with newsprint, wrapping it completely around the underside-TE-LE-underside all in one piece. Don’t cover the tips nor the rudder or elevator TEs – those will be sealed with Glue Glop.

Construction is very similar to traditional balsa construction.

Preliminary sub-assemblies: Build up the bulkheads, add the bass servo rails to the servo plates, laminate the bolt plates, and so on, using GG or aliphatic. Bend the tailwheel strut, then sew it to the tailwheel plate with stranded fishing line. Don’t use monofilament, as that will stretch and resists CYA. Soak the thread with CYA. If you look carefully at the Lolli’s tail in the maiden flight imagery, you’ll see I replaced the non-steering tailskid with a commercial tailwheel assembly shortly before the maiden day. The skid works fine on grass and is both simpler and lighter, but steering is nice when we get our rare flights at a paved strip.

Fuselage: Mark the bulkhead locations on the fuse sides, then make two of them by gluing (FC or GG) the internal foam parts and the dessert stick reinforcements. I prefer to make both sides simultaneously, keeping them top-to-top so I don’t make two of the same side. Let dry, then add the bulkheads to one side. When dry, add the opposite fuse side and let dry. Please note that I like to keep fuselages constant width from the nose to the wing TE as it makes straight construction easier!

Brace the fuse sides upside down and glue on the bottom sheeting from the wing TE forward (Note: I used a long drill bit to drill for the bottom wing dowel. If you don’t have one, then figure out how you’ll do it) then join the fuse sides at the tail and add the foam bulkheads aft of the wings. Turn the fuse upright and sheet the turtledeck. Flip the fuse back over and install the pushrod tubes (mine are blue), using the tail feathers for guides. Sheet under the aft fuse..."

Supplementary file notes

Build notes.
Build pics.
Parts list.

CAD file

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Lollipop (oz14847) by Bill Bowne 2023 - model pic

Datafile:
  • (oz14847)
    Lollipop
    by Bill Bowne
    2023 
    34in span
    Electric R/C Biplane
    clean :)
    all formers complete :)
  • Submitted: 27/09/2023
    Filesize: 886KB
    Format: • PDFvector • CADfile
    Credit*: BillBowne
    Downloads: 481

Lollipop (oz14847) by Bill Bowne 2023 - pic 003.jpg
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Lollipop (oz14847) by Bill Bowne 2023 - pic 004.jpg
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Lollipop (oz14847) by Bill Bowne 2023 - pic 005.jpg
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Lollipop (oz14847) by Bill Bowne 2023 - pic 006.jpg
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Lollipop (oz14847) by Bill Bowne 2023 - pic 007.jpg
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User comments

Nice clear plans. But what is the target flying weight?
StefanWulph - 07/10/2023
It says 24-28 oz on the plan, in the title block.
SteveWMD - 07/10/2023
And so it does. Oops >.<
Thanks SteveWMD . :)
StefanWulph - 07/10/2023
My Realflight8 versions of this cutie plus a tricycle gear version. Lollipop Taildragger is at: https://forums.realflight.com/index.php?resources/lollipop_td_ea.30703/. See also files for Lollipop Floats, Lollipop Tricycle, Lollipop BWPlus Base colorscheme.
Great little flyer in any version. Thank you to Bill Bowne,
StefanWulph - 21/02/2024
Thank you! The Lolli is one of our favorite fliers :-).
Bill Bowne - 10/04/2024
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Download File(s):
  • Lollipop (oz14847)
  • Plan File Filesize: 886KB Filename: Lollipop_oz14847.pdf
  • Supplement Filesize: 44KB Filename: Lollipop_oz14847_build_notes.pdf
  • Supplement Filesize: 4479KB Filename: Lollipop_oz14847_build_pics.pdf
  • Supplement Filesize: 16KB Filename: Lollipop_oz14847_parts_list.pdf
  • CAD Zip Filesize: 95KB Filename: Lollipop_oz14847_cad.zip
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Notes

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Scaling

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