Rahul's RC Aircraft and other designs

 Always wanted to build a biplane.. and here is one.. It flies beautifully.. awesome slow speed characteristics, amazing roll rate... it parachutes down with power off Dimensions A simple rectangular wing, box fuselage made out of 5mm XPS sheet/depron makes it very easy to build, and it can be built very quickly. The research on CG of a biplane led to quite a range of literature, from simple to some very detailed ones (incl CLs of the airfoils)... finally KISS prevailed (keep it simple and straight).. The wing cord was taken as distance from the LE of the wing positioned ahead to the TE of the aft wing.. and it worked Another aspect which went through a similar approach was .."whether to have ailerons in top and bottom wing or only one (bottom) wing"... here again, went with having the ailerons ONLY on the bottom wing.. and it works. Electronics Motor - 2212, 1200kv (even 980kv will do, used this as that is what I could spare). Prop 9x4.7, Servos - 4 x 9 gms , battery - 1500 ...

A small aircraft based on the swift bird, saw a similar one in RCGroups and liked it, and decided to make one.. 24 inch wing span, KF2 wing,  AUW 86g, including a 1811, 2600KV motor, turning a chopped 4.5X3 prop and a 2S 300mah bty.. no spar on wing .... it is a light and small bird The pictures explain the build better It flies amazingly (bio mimicry is real).. stable and has flown hands off. here is a video https://www.youtube.com/watch?v=sDYZjwUOt4E Also another video of the aircraft in a dogfight with a kite(bird) https://www.youtube.com/watch?v=h4ubSP_iVe4&feature=youtu.be

This is delta with a canard. Overall it looks a cross between a Eurofighter and a Viggen ..  High alpha flight was desired, hence the canard has a fixed front plate set at 0% and a moving rear plate.. more like a tail plane with a elevator.. (pics speak better than words).. For pitch-up, the canard rear plate moves down and the elevons move up.. The canard is controlled by a separate servo (5 gms) The wing platform is a delta with a KF2 profile. The leading edge of the wing is covered with newspaper which has been applied with diluted PVC glue . After shrinking it forms a nice , smooth and taunt surface , and also adds to the torsional rigidity. The wing has two 1mmX3mm CF strips glued to the top and bottom to acts as a spar (with the 6mm foam in between them) The test flight showed tendency of sudden onset of tip stalls and dropping of a wing.. To delay this two wing fences were added to each wing ... also it had landed badly and damaged the motor mount (tail-...

This is a F-18 with 30" span and with a 2826 2000Kv motor It is based on a scale F18 Growler with some changes in the dimensions.. refer to the picture below for the dimensions It has ailerons, elevator and rudder as controls and one CF spar in the wing Has a wire skid fixed undercarriage, and can do a rolling takeoff from a decently flat surface.. A good  flyer, and with the heavier parts (motor, bty) close to the CG was quite maneuverable  .. The finished but unpainted version.. the picture gives a feel of the size The canopy can be removed to access the battery compartment It has flown many sorties.. and has been retired and parts recycles (like many of my planes.. storage is a challenge) Here is a flight video  https://www.youtube.com/watch?v=YPAsXsSOFqg&t=8s