Rahul's RC Aircraft and other designs

A saw the video of the RedBull aerobatic glider team doing some exquisite flying and decided to  build something in those lines The design had to have low sink rate, Low drag, 4 axis control & low wing loading. Span : 1015mm Root Cord : 155 mm Tip Cord : 100 mm Wing LE to Motor : 175 mm Wing TE to Tailplane : 320 mm Tailplane Span : 305 mm Tailplane TC : 115 mm Tailplane TC : 85 mm Vertical surface ht : 130, Base width 115 mm The wing is folded out of 3 mm depron. It is 3 mm depron top and bottom surface with a depron spar.. The thickness is 9%.. so the spar is is two 3 mm depron overlapped to 3/4 span, the outer part of the spar is just a single strip of 3 mm depron (3+3+3=9 mm.. which is 9% of 100 mm) . The top and bottom sheets were laminated with 45 micron laminating plastic film, the fold was grooved from the inner side and the the top part slowly folded over and glued onto the spar and in the TE. The aileron is just the top surface extended The tail feathe...

EXPERIMENTAL HYBRID MULTI-ROTOR Experimental Quad, to test the concept of having major part of the lift,  being provided by a different setup than the standard lift cum control motors of a multi-rotor . We know that 1.Larger props are generally more efficient in generating lift 2.Currently, IC engines setups  have better endurance than pure electric setups The experiment was to test such a setup where the major proportion of the lift is provided by efficient large diameter, low rpm props. In the initial setup,  this lift generation would be driven by low consumption, low KV electric setup.. . In the next stage, the lift generating setup electric setup would be replaced with IC engine setup, for substantial increase in in range/duration and lifting capacity Concentric contra-rotating props would have been ideal.. however, in the absence of a ready concentric contra-rotating gearbox, the option was to have two contra-rotating props suitability placed in a symme...

This is a 1000 mm span aerobatic aircraft, in the lines of a pattern ship built during covid lockdown The wing is symmetrical , constant cord Span : 1000 mm Cord : 200 mm + 40mm aileron Airfoil :FX 77080 and 15% thickness The wing is hotwired, and the leading edge is fiberglassed with 100 gsm FG, upto 25%. This itself acts as a spar. Something like a D box.  The full length ailerons are 5mm depron covered with paper for stiffness The tail assembly, horizontal and vertical stabilizer, are constructed our of 5mm depron , with the leading edge (upto 25%) covered with paper Fuselage is box construction out of 5mm depron. The underside is fiber glassed  with 100 gsm FG The cowl was modified and the ailerons were trimmed to align with the wing tips She is beautiful .. both in looks as well as in flight characteristics.. hammerheads are perfect, rolls are controlled , it flies as if on rails..  

A pivoting wing design in the lines of Mignet's Flying Flea Front wing : Span : 755 mm Cord : 155 mm Airfoil : NACA 23112 Dihedral Rear wing Span : 510 Cord : 155 mm Airfoil : NACA 23112 No Dihedral Motor : 2204, 1400kv, 3s 1500 bty, 30A ESC, 7x4.8 prop, 2x 9gm servos. All these are reused components , and specially the motor/bty/esc combination could have been much smaller and lighter Horizontal separation of wings 15 mm, Vertical Separation of wings 85 mm Wanted to keep the construction  simple Both the wings have the same cord and airfoil. This makes construction easy in terms of hotwire airfoil template / ribs> The wings are hotwired out of EPS, and the leading and training edge have been laminated. There is a 3/4 span 3 mm CF road in the front wing.  Two thin Aluminium "L" section have been epoxied at 20% of the cord, on the bottom surface of the front wing. The lower prong of the "L" have holes through which a bolt attaches it to ...

A fast rc aircraft for flying for windy days (not a floater). Main design aspects, around 36" span, Plank Flying Wing, like funjet (not swept back and hence no twist), low drag, higher wing loading,  high power /wt, symmetrical airfoil. Material blue foam / insulation board / XPS..  Airfoil NACA0009, thickness 9%. , hotwired the final dimensions are 1. Span =  880mm / 34.6" 2. Root cord = 250mm / 9.8" 3. Tip Cord = 150mm / 5.9" 4. Sweep = 30mm / 1.2" CG @ 15% = 44.5mm / 1.75" Wing area = 17.52 sqdm / 271.6 sqinch / 1.88 sqft The wing was hotwired out of blue xps. The fuse is also blue xps, hollowed at some places , with some strengthening Initially I was planning to have a CF sparred wing covered with monokote ..  hence, according to the earlier plan , the wing  has CF spars  and a CF tow, while the fuse has balsa and an aluminium channel embedded for strength. Latter on, in midst of the construction, decided to cover the whole aircraft w...