Sickle 3 (oz15167)

 

Sickle 3 (oz15167) by Steve Fauble 1983 - plan thumbnail

About this Plan

Sickle 3. Control line FAI combat model.

Direct submission to Outerzone.

Quote: "Sickle 3, by Steve Fauble. Laminated balsa spars and trailing edge, plus hot-wire cut foam forward section, make this FAI Combat ship a standout - in looks and performance.

Combat flyers are you listening out there? If you're not flying FAI combat you are missing out on what I feel is the most innovative and outright fun event going. The planes fly extremely well, and if you run a Fox .15 BB it is much less expensive than AMA-style combat. The international rules, if used at the local level at all, are confusing and hard to keep in mind, but even this can be a lesson in mental concentration.

In this article on my latest design, the Sickle 3, I will try to get your enthusiasm going for FAI. The plane has 450 sq in of area, and should weigh about 14 oz with a Fox. This combination will give you a low enough wing loading for a truly spectacular turning plane.

The semi-eliptical planform seems to handle the turbulant Texas winds (our constant companion) much better than a straight taper wing. The curved leading edge also seemed to be more crash resistent than a straight or tapered wing. I don't know if the reason is that the tips don't hit the ground in a crash or if it is that the built-in stresses tend to counteract the forces of the sudden stop. I will show you how to make these with very little extra effort, and at a lower cost than using ordinary spar stock. If you are still reading this you must be interested, so let's get ready to make some planes.

The first step is to find some 48 inch long wood. I would recommend Balsa USA, in Marinette, Wisconsin as a source. With the exception of their 1/16 thick wood, all of the wood I have purchased form them has been of very good quality at a super price. Using long wood as I do in this design, you will need to use an aluminum straight-edge to true one edge.

The next step will be determined by the number of planes you are going to produce. If you want to make a single copy to try out the design, make a template for both the spars and the trailing edge out of artist's matt board or a very heavy cardboard. Then, using strip wood of the correct size and length, laminate two sets of spars and one trailing edge. I use Tightbond thinned 10% with water as my laminating glue. You have to wait for this to dry thoroughly, about 24 hours, but it has excellent strength and is not expensive.

If you are building three to six planes at a time (almost all serious competitors build at least this many in a single run), you will need to proceed to plan B: Buy an 8 ft length of 2x6 at your local lumber store. If you don't tell them what it is for, you won't get laughed at. Trace the outline of the spar curve on a four foot piece and the trailing edge on the other..."

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Sickle 3 (oz15167) by Steve Fauble 1983 - model pic

Datafile:
  • (oz15167)
    Sickle 3
    by Steve Fauble
    from Model Builder
    January 1983 
    47in span
    IC C/L
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 05/03/2024
    Filesize: 716KB
    Format: • PDFbitmap
    Credit*: MB2020
    Downloads: 176

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* Credit field

The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.

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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