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Old 10-19-2018, 04:09 PM
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Technoavia SP-55M

I have a Saito FG-90R3that needs an airframe. Technoavia's modified Yak 55 looks a likely candidate. Short nose should suit the rather heavy Saito. Aerodynamics are good with wing and stab close to the CL. I like the quirky look with bubble canopy and spindly legs. Relatively simple shaped fuselage suits wood and foam construction. This is also an exercise using Fusion 360 3D CAD.
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Old 10-19-2018, 05:50 PM
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I have assembled as much reference info as I could find on the aircraft. Dropped the drawings I found into Fusion for comparison. They all matched up pretty well. Fusion was great for this, easy to manipulate the images and fade between them for comparison.
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Old 10-19-2018, 06:44 PM
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This model is for IMAC sequence flying so I will take advantage of the 10% scale deviation allowed. this means stretching the tail moment as much as possible and increasing the fuselage side area for better knife edge/roll performance. Usually I would make the fuselage 10% bigger all over while keeping the wing span the same. However for this model I am stretching the fuselage 5% then enlarging it 5%. Fusion makes this easy. Here is the modified fuselage together with unaltered reference drawing.
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Old 10-19-2018, 06:53 PM
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Dropped in an image of the Saito to check the fit. Looks good.
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Old 10-19-2018, 07:13 PM
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The drawings don't really do the canopy justice. I have put in a reference photo to trace over.
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Old 10-19-2018, 07:45 PM
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BTW span is 2.285 meters or 90 inch. Going by wingspan the scale is 27.5%, going by fuselage size scale is 29% take your pick.
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Old 10-19-2018, 08:27 PM
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I have already done a couple of versions to work out a drawing and construction strategy. I want a new clean drawing that is easily adjustable. The construction plan is to make a balsa box with balsa covered foam decks. I've got the CNC foam cutting worked out now and I have super light foam in stock and a good supply of balsa.
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Old 10-19-2018, 08:42 PM
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Nice work!
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Old 10-20-2018, 02:12 PM
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Traced over the imported drawing. Modeled the nose and fin. Now just have to join them together.
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Old 10-21-2018, 05:59 PM
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Pretty much got the outer shape how I want it. I have some of the inner structure there. Now I will do the motor box/wing mount.
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Old 10-22-2018, 11:11 PM
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Working on louvres. They are quite prominent and add lots of character. I will 3D print these.
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Old 10-24-2018, 09:13 PM
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It has taken a while to figure out my design concept for the internal structure. Here is the unfinished motor box.
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Old 10-24-2018, 09:59 PM
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Ive ordered some 16mm x 2mm wall carbon tube for the undercarriage. I will probably 3D print the wheels.
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Old 10-25-2018, 12:29 AM
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Going to be a nice looking plane.
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Old 10-25-2018, 07:48 AM
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Rod, I kit a 102.5” yak designed for imac use. Would you like to see some build pics? I’ve got almost identical way of construction believe it or not
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