Rahul's RC Aircraft and other designs

This was built in in 2022. It has symmetrical airfoil. Composite construction foam - fiberglass-CF. Used a balsa CF sandwich for the elevons and it came out really nice 920mm/36 in span ,2 x 2206 2000kv motors, F405 flight controller, 2x 9gm servos, 4S battery. Had to iterate a couple of times and airframes before arriving at a good flying setup. Here is the final video .. https://www.youtube.com/watch?v=pVT5TLOxDik

 Fast, hotliner design These two are built for speed, and unlike a 3 surface (wing , tailplane and rudder) design, they are wings (delta). The thought was having the max wing area for a given wt and strength and with the least friction/profile drag, and of course ease of construction. (ignoring  difference in Induced drag). Construction is composite, foam, glass fibre, carbon fibre and vacuum bagged,  resulting  in a very strong lightweight structure for its wt. Airfoil is PW 51, with a 1.5 degree washout at the tips. Small wing tips are added to draw out the tip vortex. The LE is reinforced with CF. The wings tips and the centre section of the underbelly has some CF  reinforcements built in. It has 2 layers CF tow of different lengths acting as spar. The paint pattern has been painted directly onto the skin and then vacuum bagged. The control surface hinges are live hinges built into the glass fibre skin. The servos and push-rods are embedded with the wing. All...

 A slightly different 3D plane designed and made by me. Span is 900mm The wings are low AR and highly tapered. It has a deep fuselage, akin to a pattern flyer. The LE of the ailerons are also tapered. Additional vertical side was added via wingtip plates and a dorsal fin. This gives the ac fantastic tracking an handling. All surfaces are made out of 9mm epp sheets, which were hotwired out of a EPP block.  It has a few CF 3x1 mm strips embedded for strength and stiffness. Additional stiffness is comes from fishing line rigging across the fuselage, wings and tail surfaces. This gives the aircraft very good stiffness without adding weight and is very strong (the fishing line is kevlar).  Electronics : 2212 1400kv motor, 9x5 prop, 30A esc, 4 x 9gm servos. Flies witha 1300/1000mah bty.. AUW 500gms.   A beautiful looking aircraft, which also flies amazingly. Even other flyers vouch that it flies better than many brought out 3D kits. Here is the plan

DESIGN This design explores the region between a plank and a swept wing flying wing, and to try and get the best of both worlds to whatever extent possible.... The major balancing acts were being efficient across a large speed range, good C l /C d , less twist, and maintaining good flight characteristics. PLAN & DIMENSIONS A span of 1200mm was chosen to keep it a one-piece plane.  - Sweep is a very moderate 13 degrees measured at LE, and even lesser when measured at 1/4 AC line. - - Aspect ratio =- 6.3... (adequate wing loading with the set span of 1200mm span) - Taper ratio= 0.65 and Twist - (-)1 degree..... (close to elliptical lift distribution, less induced drag, while maintaining decent Re and flow characteristics at the tips, good stall characteristics) - Airfoil is PW51.. (good cl/cd, adequate +ve cm, and minimum trim losses).  - A central tailfin is chosen over wing tip fins.... (due the the less moment arm and the issues arising out of a badly designed wing tip ta...

 This is a Plank flying wing for SAL or bungee The dimensions are  Span = 875mm, Root cord = 260mm, Tip cord = 160mm, sweep = 60mm. 20mm constant cord full length elevons The wing is hotwired out of EPP and then laminated with thin iron-on laminating film. The airfoil is PW51 7% thick at the root and PW51 7.5% thick at the tip. It has a 1.5 degree washout and a 45mm dihedral at the tips.  It has one 2mmCF spar glued to the bottom positioned at 40% cord. There is also a spar on the top surface biased to the rear to avoid elevon reversal. Two 9g servos are positioned vertically into slots cut on the top of the wing. The position of the servos are driven by the thickness of the wing at that part and distance from CG. The full length elevon is a tapered 3mm balsa with fiberglass lamination. ....Note I had to increase the elevon cord at the tips by 12mmto improve the control response (after the first flight trials) The fuselage is a 3mm CF rod glued onto the bottom of the wing...

 A slightly swept plank design.. a bow (something I was itching for a long time) .>The idea was to keep the planform as a plank (wider speed range) but with very moderate sweep to move the MAC a bit behind while avoiding some of the cons of a swept planform.  >Wanted to keep the TE straight, and the elevons not upto the edges to avoid unwanted separations.  >The thinning out of the airfoil thickness, rounding of the wing tips, and the very slight washout (1.5 deg) for a efficient span wise lift distribution and reducing induced drag. ( Peter Wick's Plank design was a big help). >The fuselage has been kept to a minimum with just a small pod in the front to house the electronics and boom at the back with the vertical fin Dimensions The wing is hotwired out of EPS.. Airfoil :  Root- phoenix 110% / P1 tip- phoenix 100% / Tip- phoenix 70%... There is a -1.5 degree washout between the P2 root and the tip The wing has a built-up CF tow cap spar at 35% ..it does ...