Sequel (oz14476)

 

Sequel (oz14476) by Bill Bowne 2012 - plan thumbnail

About this Plan

Sequel. Radio control sport model, for electric power. Wingspan 44.25 in, wing area 360 sq in. Foam construction.

Direct submission to Outerzone.

Quote: "Sequel is a follow-on to my Sassy and Senior Sassy designs (252 sq. in. and 432 in. sq, respectively, and both available from Sarik Hobbies). For the Sequel, I set the wing area at 360, but the big change, is that the Sassies are wooden designs whilst the Sequel is all foam (pink Owens-Corning insulation (POC) and white Model Plane Foam (MPF)). Two other, minor changes include making the Sequel a trike gear model and moving the elevator hinge line slightly aft. Now the elevator and rudder hinges line up, making for easier foam construction.

This isn’t a step-by-step explanation of how to build the model. Instead, I’m trying to cover the high points and explain why I do some things the way I do.

My primary adhesive for covering and hardening the foam is an (approximately) 50/50 mix of Titebond II and tap water. For construction, I used both clear Gorilla Glue and Bob Smith’s Foam Cure. Covering papers are brown Dollar Store parcel wrapping paper (at $1.00 for a 15 ft roll), and blank newsprint paper (from Wal-Mart, although I should go to U-Haul so I can get large enough sheets to do a fuselage without having to overlap sheets).

All surfaces to be papered got a coat of thinned Titebond, then were sanded with 200 grit sandpaper. After that came the paper, wetted with tap water and coated with thinned Titebond (Yes, it is messy). After the paper dried, everything got another coat of thinned Titebond (except the wing, which didn’t get the second coat until after the spars were on and dried).

Key points are that the aileron bays and everything OTHER than the wing are covered with thinned Titebond and wet newsprint. The wings are covered with wet brown wrapping paper and thinned Titebond, then, once the cores were trimmed and joined with Foam Cure, I added a strip of wet brown paper around the joint, and brown paper diamond spars.

Ailerons and Tail surfaces were cut from POC hot-wired to 1/4 in thick, then covered with newsprint (the elevators get joined before covering, likewise the balsa torque rod blocks were installed in the ailerons and the aileron LE sanded before papering).

As the thinned Titebond won’t stick to plastic clothespins, I use them to hold drying bits whenever possible. I try to avoid using T pins to hold parts whilst the thinned Titebond dries as I’ve found the pins quickly rust. The rust then stains the paper and makes the pins harder to push through cleanly.

The fuse is built up just like a balsa fuse would be, using 1/4 in sq POC foam and the 6 mm (.232 in) MPF. MPF is stronger and stiffer than POC, which is why I use it on the fuselage. POC, whilst not as strong as MPF, is quite adequate for tail surfaces when covered with glued newsprint.

I did have an issue with the ailerons. After initial papering, the ailerons bowed away from the wing TE side. So, I wet them down and braced them as shown. Every bit touching the ailerons was 'insulated' with plastic sandwich wrap. That did the trick. I repeated the bracing with the last glue coat, too, just in case.

The aileron torque rods are commercial rods, Gorilla Glued into slots in the wing bottom, which were then capped with 1/8 balsa scrap and brown papered over.

I wasn’t able to find nylon nose gear blocks smaller than 5/32, so I tried using brass tubing sleeve bushings to expand the 1/8 music wire nose gear I’d bent. That was a mistake, and after repeated nose gear failures on our grass field, I removed the nose gear, added a tail wheel and a forward main gear platform, soldered a new main gear (using the old main gear plate for the rear strut). The result is a model that handles even rougher grass with grace!

After the final glue and water coat dried, I put on coats of rattlecan primer (sanding between and after the coats), then finished the model with satin gloss rattlecan enamels. The AMA numbers are Ultracote/Profilm, ironed on at LOW heat. Pinstriping is from an auto accessory shop.

Sequel flies very much like a Falcon 56 or Sterling Fledgling, both excellent aileron trainers and sport models. It’s become our favorite model, capable of remaining stable in some wind, whilst still being able to do nice round loops and smooth rolls. We did find the dark blue wing leading edge disappeared when on final, hence the white-painted labels added to the wing leading edges."

Supplementary file notes

Build notes.
Generic Foam and Paper Construction Notes.
Photo pack.

CAD file

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Sequel (oz14476) by Bill Bowne 2012 - model pic

Datafile:
  • (oz14476)
    Sequel
    by Bill Bowne
    2012 
    44in span
    Electric R/C
    clean :)
    all formers complete :)
  • Submitted: 20/03/2023
    Filesize: 628KB
    Format: • PDFvector • CADfile
    Credit*: BillBowne
    Downloads: 480

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Sequel (oz14476) by Bill Bowne 2012 - pic 005.jpg
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Download File(s):
  • Sequel (oz14476)
  • Plan File Filesize: 628KB Filename: Sequel_oz14476.pdf
  • Supplement Filesize: 27KB Filename: Sequel_oz14476_build_notes.pdf
  • Supplement Filesize: 51KB Filename: Sequel_oz14476_generic_foam_and_paper_construction.pdf
  • Supplement Filesize: 13852KB Filename: Sequel_oz14476_photo_pack.zip
  • CAD Zip Filesize: 253KB Filename: Sequel_oz14476_cad.zip
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Notes

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Scaling

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