Mini Quasi Turbo Raven (oz14489)

About this Plan

Mini Quasi Turbo Raven. Radio control sport 3D model, for electric power. Wingspan 100 cm.

Quote (google-translated from the Italian): "MQTR - or Mini-Almost-Turbo-Raven, a 3-D acrobatic for those who prefer the good old 'do it yourself' to 'ready to fly'. By Giuseppe Ghisleri.

Claudio is a longtime aircraft model maker and says he builds models to pass the time. For this reason he is always looking for something that interests him and keeps well away from the 'almost ready to fly' and, even more so, from the 'ready to fly'. Having seen the review of the Spirit 3-D ARF in MODELLISMO number 82, July-August 2006, he asked me to draw something along the same lines: one meter of wingspan, 500-600 grams of weight, motorized with about 150-200 Watts for exuberant performance and made with lots of nice 1 and 1.5 mm thick balsa strips and boards.

Having in the 'unemployed box' a Hacker B20-18-L with reduction gear. I found myself completely involved and I designed the model that I am presenting here inspired by the QuasiTurboRaven line that you have already seen in the pages of this magazine. This also explains the reason for the name.

With the ready-made models that are found at a good price today, starting to build a similar model doesn't make much sense and if we add to this that a structure conceived in this way has very little chance of surviving the knocks that make a mustache to the EPP structures, it is clear that this model is dedicated to those who have time to waste or are attacked by the nostalgia of balsa and its powder that slips into the nose and makes you sneeze at will.

Once the model had been drawn and the measurements of the strips and tablets established, it was necessary to visit a model shop which still sells the rarest and lightest substitute for gold: balsa.

Our research took us to Modelberg in Bergamo, where Andrea Vavassori presented us with mountains of tablets and strips, allowing us to choose the cut and weight we wanted, which is almost impossible anywhere else these days. The construction turned out to be fun and therefore the first aim was achieved.

The flight characteristics are not those of the classic 3-D model. In fact, the MQTR is a model that flies with a fair speed and that responds with good precision to the commands; in short, a small acre of fun, and given that we model makers are now over middle age (but, as Marcello Marche said - yes, the other half is unknown...) we have some difficulty with 3-D, I can say that the second goal has also been achieved.

While I was at it, the nostalgia operation was completed on my part with a period finish: Modelspan and paper tensioner. Claudio instead chose a more current transparent film. I used a carbon foil slide left over from an unarmed shock-flyer, while Claudio made it from scratch in fiberglass.

The model will takes off from grass runways, but is also extremely easy to launch by hand. Landing presents some problems if the runway is not perfectly smooth. In fact, on the third landing I tore off the fixing plate and therefore decided to continue flying without landing gear.

I fly it with a 1500 mAh 3s pack and a 1350 mAh one with an E-Flite 9x7.5 propeller. In this configuration the Hacker B 20 draws about 16A. Claudio uses the same packs, but has a Hacker A20/22L rotary case motor that draws 18A and flies smoothly with a 9x6 prop. The performance, both in speed and in traction they are very similar, but the best is achieved with the rotating case. I'll try a 9x6 too, sooner or later.

Construction: The wing is of a structural type that I first saw used on George Aaldritch's Nobler (oz6212), the father of all circle tethered aerobatics. The side member is made with a full-height 1.5 mm balsa tablet cut up to the middle to allow the insertion of the ribs, also in 1.5 mm balsa. The ribs also have a 1.5 mm wide cut up to mid-height, so that they fit completely into the side member..."

Direct submission to Outerzone.

Quote: "Hi Mary, one small electric model for 3D flying. The name stands for Mini Quasi Turbo Raven that means Mini Almost Turbo Raven. Ciao, Beppe"

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