Little Arrow (oz9023)
About this Plan
Little Arrow. Indoor RC model for the first time flier, using GWS hardware. Wing area 1.85 sq ft, weight target 5.25oz (150 grams).
Quote: "Daunted by the seeming complexities of radio-control indoors? Then try this ultra simple introductory design by Mike Roach.
One of the more enjoyable things in life is flying a model that is your own creation. You've done the thinking, the designing and the construction - and it flies! Success like this satisfies us on so many levels: saving money, the pleasure of seeing theories proved in practice, basking in the admiration of fellow modellers and it's all so simple and accessible for Indoor fliers.
To produce a first indoor model that flies successfully just needs imagination and the ability to meet one or two important targets.
Your design must match your flying ability. You might like to try ducted-fans, or a highly aerobatic IFO clone. And you certainly don't need me to tell you how to fly it. But if, like me, you are comfortable with two channels and just about okay with the throttle, then a naturally stable, slow-flying model is the one for you. In this article show you how to design and make one that will fly superbly with the minimum of effort.
It must be 'legal'. Some indoor sites have a size, weight or power restriction, but you will almost certainly be okay if you stick to the 150 motor size.
You must want to make it. Don't waste your valuable time building if you are an ARTF modeller who prefers flying. Buy a Pico Stick and increase the dihedral (using thread tied from tip to tip) or a Pro Tech Butterfly: get up early one calm, sunny morning to get the feel of throttle as well as rudder and elevator, then go indoors and have fun.
General layout: The simplest way to start is with a 'wing at the front, tail at the back' design. All the technical stuff about thrust angles, point of balance and incidence is well known and you are pretty well guaranteed success. Just bear in mind that the best flyers have a wing load-ing of about 3 oz./sq. ft. Assuming you use the 'industry standard' GWS geared 150 motor and associated servos, SC, Rx and 6 x 250 cells, the hardware will weigh about 100 grams or 3.5 oz. You can easily build a model that weighs 2.5 oz, giving a target flying weight of 6 oz and thus needing about 2 sq ft of wing. My scale Howard-Wright Monoplane (oz9893) uses this gear and has a wing loading of 3.7 oz/sq ft. It can fly very slowly and is agile enough for small-hall flying, so the target loading is not only easy to meet, but has some leeway if you can't get light balsa.
An 'old-fashioned' curved plate wing section has the best performance. They knew this 100 years ago, so don't think you have to have an Eppler section for indooe flying. Most indoor pilots have a comfort zone of between 4 to 10 mph, which is just right for this simple airfoil. You don't need to worry about drag, you just need lots of lift..."
Scan from DBHL, cleanup by theshadow.
Direct submission to Outerzone.
Update 19/03/2019: Added article, thanks to RFJ.
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