Chilli Wind (oz10308)
About this Plan
Chilli Wind. Radio control sports model. Wingspan 57-1/2in, wing area 570 sq in, for .40 to .50 size motors.
Quote: "Go for aerobatics with Mike Delacole's compact 57 in hot shot. Chilli Wind.
The Chilli Wind is a compact aerobatic machine designed around motors in the .40 - .50 cu in range. It is an attempt to create a model that would provide an ideal introduction to the modern 'turn around' around style of aerobatic flying. It has simple, classic lines which make for a light-weight structure that is relatively easy and quick to put together.
Many of the ideas incorporated in the design have come out of experiments I have been conducting over the past six years with lightweight sports designs. The models that pleased me most from this period were the Rival, a 48 inch span fun fly model, and the Cyclone which was a 57 inch shoulder wing aerobatic trainer. This was powered by a Super Tigre S45 ABC fitted with a tuned silencer and, weighing in at just over 4-1/2 Ibs, it went like a rocket and yet also had good low speed performance.
The seeds of the Chilli Wind came out of that design. At about that time I produced my own version of the popular Dan Santich Hots (oz4581) design using the flying surfaces and moments of the Rival, coupled to the styling and configuration of the Hots. This was a fun machine and it gave me some ideas regarding the styling of the new low winger that was taking shape in my mind. When the drawing board was finally visited, which was way back in 1988, the Chilli Wind was the result.
I have retained some features from the Jetta but gone is the anhedral tail, swept wing and tricycle undercarriage. Gone too are the curves. I have tried various wing sections, ranging in thickness from 12 per cent up to 15 per cent, but finally decided that the 13.1/2 per cent sections shown on the plan were most suitable. The rest of the model is very straightforward and as there are no specialist items, you should be able to find all you need at your local Flair stockist.
Good vertical performance is a necessity for this type of model and this means power. Unfortuntely power also means noise, so if you want to keep your flying site, this is a problem that has to be solved. One answer is to follow the example of the big boys and use larger diameter props of coarser pitch and an engine/pipe combination that will turn such a prop at useful revs. I think we have to forget about the trusty 10 x 6 screaming around at 17,000 rpm. The model in the photos uses Bolly products and these come from Australia. I found these via the Wizard of Oz - Brian Winch - whose help I very much appreciated. Following Les Bollenhagen's advice the OS 46 SF ABC is turning a Bolly 11-1/4 x 8 glass prop and exhausting through a Bally carbon fibre quiet pipe. The pipe is ideal for the Chilli Wind as it is so light (pipe and header weigh only 4-1/4 oz) and although quite long, it blends in very nicely. Running this set up will produce around 11,500 rpm and gives all the power needed plus it minimises the noise problem. I am sure that there are many other combinations that will work effectively and it is worth doing a bit of experimenting to see how you can get the best out of your engine.
Models fly better if they are built accurately. With this in mind take good care at each stage of the construction, from the marking out to the final balancing. Although this could well be your first model from a plan I have assumed that you have previous experience of building from kits.
The prototypes have all used foam wings which were obtained from Geoff Mosely of Dalesman Wings. They have all been very accurate, beautifully made and are heartily recommended. First job is to check for accuracy. Small differences can be lost at the centre when joining but badly warped panels should be discarded. Next glue the 1/4 inch balsa LE and TE in place and when dry shape to required section. Sand roots to the correct dihedral angle, cut out aileron servo well and accurately prepare a groove in each panel to accept the wing locating dowel later on..."
Chilli Wind, RCM&E, May 1991.
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Supplementary file notes
Article pages, thanks to RFJ.
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User commentsHi Steve and Mary - Thought I would send this shot of my current Chilli Wind [more pics 006]. It was built by my dad and the only real difference to plan is the builtup wing. Between us we've had about four or five of these designs (including the smaller version). A great model, brilliant mix of being easy to build, the distinctive looks and butter smooth flying characteristics. This one is electric, a 3548 900kv motor with 11x8 prop and a 4s 5000mah lipo whichgives 12 minute flights. Thanks again for your continued efforts!
NigelR - 09/08/2018
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