Bluebottle (oz14086)

 

Bluebottle (oz14086) by Jack Headley 1983 - plan thumbnail

About this Plan

Bluebottle. Radio control sport biplane model. Semi-profile design.

Quote: "A quick-build two channel 1/2A sport biplane. Bluebottle, by Jack Headley.

The original concept for this model was a two channel monoplane but, as the design progressed, it began to look rather heavy and clunky, so another wing was added to lower the wing loading, and help the radio box shape. I'm not sure that the clunky looks entirely disappeared!

The name was a result of a paucity of paint in the Headley supply cupboard. The only thing remaining was a small quantity of blue Super Poxy, left over from another project. So, blue it became, and Bluebottle its name.

The project was to be strictly a sport model, with a stock reed valve Cox .049, regular fuels and props, and easy to fly. All in all it turned out that way, So, if you're into this sort of thing - flying for pleasure, with leisure, or flying with leisure, for pleasure - read on.

Construction: The model consists of two main items, the balsa body plus tail unit, and the foam wings. The wings are made first, as these are needed in the body construction later. Both wings are made from 'Ace' constant chord mini-foam wing kits (No.131,192). The top wing is full span and has a balsa 1 x 1/4 in TE added. Instructions in the Ace kit box describe how to do this. The wings are epoxied together with 1-1/2 in dihedral under each wingtip.

The bottom wing has a shorter span than the upper, so cut each panel down to 13 in, making a total span of 26 in before epoxying together. This lower wing is otherwise unmodified. Dihedral for the lower wing is 1-1/2 in under each tip.

Both sets of wings are reinforced with strapping tape along the lower surface. The kit instructions again cover this operation. The upper wing trailing edge is cut back slightly in the center section, to give the wing bands a larger radius to wrap around. This relief is shown on the plans. Now for the fuselage.

Fuselage: The fuselage again consists of the minimum structure, a box for the radio, a profile backbone, and all sheet tail surfaces, The radio box was designed to use sport size equipment but the guys in the headshed at RCM asked me to use the new Tower System 500 with the Mini Flight Pack. We will discuss the Tower radio in the flying portion of this article.

The first item on the agenda is to make sure that your radio will fit the box drawn, and, if not, to make the necessary modifications. The size of the box isn't really sacred.

The next step is to make a sort of kit of all the sheet pieces required, which can then be assembled almost in one step. Begin with #1, the firewall, which is cut from 1/8 ply. The engine is attached to this piece with 3/48 bolts, and blind nuts epoxied to the back of the firewall, so drill the firewall as required and install the blind nuts.

Next, cut items 2 through 6 from 1/8 sheet balsa and, from a tough piece of 1/4 in sheet, cut out item 7. Make the two 'fuselage sides' (the outlines of which are shown with small triangles on the plan) from 1/8 sheet also. These pieces are now assembled in the following way:

Place #7 on the plan, and mark on it the position of items 4 and 5. Now glue items 4 and 5 to 7, then attach one fuselage side, and the firewall #1. Glue the 3/8 triangular strip behind the firewall, and then the 1/4 triangular strip along the joint between the side and the floor.

Now attach the other fuselage side, followed by the triangular strips just discussed, and items 2 and 3. This completes the basic radio box, so the next step is to smooth this out with a few stratigically placed blocks; but, before this we need to make item 8, from 1/8 ply, and epoxy into place the 3/32 undercarriage wire. When this is set up it can be glued to #'s 4 and 7.

Balsa blocks are now needed in front of #8, on top of #2, and block or 3/8 sheet inside the engine cowling..."

Direct submission to Outerzone.

Note this plan used the Ace Foam wing. For a plan showing how to construct a replacement wing in balsa (both tapered and straight-chord) see Ace Foam Wing (oz8557) thanks to AndyKunz.

Supplementary file notes

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Bluebottle (oz14086) by Jack Headley 1983 - model pic

Datafile:
  • (oz14086)
    Bluebottle
    by Jack Headley
    from RCMplans (ref:892)
    July 1983 
    36in span
    IC R/C Biplane Cabin
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 15/09/2022
    Filesize: 530KB
    Format: • PDFbitmap
    Credit*: theshadow
    Downloads: 353

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Notes

* Credit field

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Scaling

This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.

 

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