Rahul's RC Aircraft and other designs

A "plank" flying wing  Details 1. Span 60" 2. Root Cord : 11.5", Tip Cord : 7.5" 3. Airfoil : PW 106 4. AUW : 605 g It is a "plank" flying wing, with very moderate taper. The wing is "hotwired" out of EPS a.k.a "thermocole". It has a 1.5 mm X 3.0 mm CF strips glued on the top and bottom surface of the wing to act as spar. The whole thing acts as a beam, and with the CF under tension becomes very stiff.. and is very light weight.  In the past I used to cover the foam with paper. This time, it has been covered with monokote, ironed-on. With some testing, the suitable temp was found which stuck & shrunk the film without damaging the foam. The wing covered with monokote, came out very good. The elevon is a constant cord elevon @ 10 % of wing area some pics The hot wired cores The reinforced roots with the joiner tubes. Had to use some polyurethane glue to harden the grooves, and fiber tape to reinforce the whole a...

Here is a rc Sukhoi PAK 0 . The plane was built based on the plan view of the actual aircraft, suitably modified.. the leading edge sweep was reduced and the span was increased (compared to the scale). (the next build will have a better fuse, in any case the bty is housed inside the fuse and accessed by a hatch on the fuse top. The shape of the fuse needs to be changed, which I do in my next build The CG is located on the line joining the points the main wing LE start point Span 24 inches AWU - 250 gms Motor ; 2205. 2200KV, turning a 6X4 prop chopped to 4.5X4 She flies beautifully

This is SU 34 built with Canards, Ailerons and Elevons.. and leading edge droop (this was made some time back.. publishing it now) Span is 34".. it is made of depron All the 3 control surfaces .. the Canards, Ailerons and Elevons are controlled by 2 X 9 gms servos The connection of the servos and the control surfaces are  apparent in the photos.. i.e left servo, left horn to left aileron & left elevon.. and left servo right horn to right canard ...... and the opposite for the right side. Note .. the leading edge  has a droop of 25 degrees. This betters high alpha flight and also adds to the rigidity It has a 2826 / 2200 kv motor turning a 6X3.8 prop .. AUW is 465gms flies beautifully... . The canards add sharp responses both in pitch and roll.. it flips within itself, and can do so a couple of times in one go... .. high alpha flight is also very good, though yaw axis control is not there (it does not have moving rudder.. which I plan to add)... ...

Hotwired foam Flying wing - 45" ~~ 114.5 cms Airfoil : MH64 Span : 114 Root Cord : 30.5 Tip Cord : 23.5 Twist : -1.7 degrees This is hot wired out of expanded polystyrene. It done in the single template method,  with one end of the wire anchored Tips had -1.5 degrees of twist Below is one of the cores after the cutting . it has come out very good . the template is still fixed to the core   the core without the template. Note the cord line the  calculations are Pictures of the finished wing Motor - 2230 1780KV ESC- 30 amps.. I do not have a lower rating ESC.. the max current draw on rig is 9.5 amps Prop - 6X3 AUW : 400 gms.. including 1000mah 3S bty -The wing has one 1mm X 3mm flat spar, running full lenght and one cross 3 mm joining spar -The motor mount is made out of coro and balsa - ailerons are balsa 1.75" - Wing is covered with tracing paper.. the paper is pasted with 50% white PVA glue thinned with 50% water. .. the p...

Here is my motor testing rig It is very simple to construct, the components required are as below 1. A telescopic drawer channel(runner), which is used in furniture sliding drawers/shelves 2. A watt meter 3. A small hand held weighing scale 4. Electronics, ESC, Rx 5. A simple C clamp 6. Some scrap wood The whole thing is so simple, hence no drawings... the pic below is self explanatory. A simple motor mount is fixed on the telescopic channel, which in-turn is fixed on a piece of wood. The motor attached to the mount with zip ties. One end of the weight scale is attached to the sliding part of the channel and other end is stayed by a bolt fixed to the main board The electronics are attached in the normal manner The thrust in gms is read off the weighing scale and the amps, V, watt is read off the watt meter.... i do not have a tachometer yet

The whole exercise of design, construction/build and trimming of a Flying Wing. Requirements Wanted an aircraft which could fly long in a calm (thermal) or on slopes (windy)… . Structurally wanted maximum use of locally and easily available material. Should be easily transportable. Easy to build.. span around 48” to 50”. It would be hot wired EPS(thermocole) covered with paper. This keeps the weight down and gives a good airfoil adherence.  Planform •   Opted for a flying wing on basis of wing loading  and less drag, and the fact that I would not have to construct a fuselage.   Balsa with covering was out of scope. Reynold number is estimated would be around/below 100000 Construction method •   Hot wired EPS(thermocole) covered with paper . This keeps the weight down and gives a good airfoil adherence. Design •   Did not want to go with an plank design primarily due to pitch response issues  with a high aspect ratio in a...

Attaching a few pics of a fomie with variable camber wings. The camber is coupled with flaps... Basically leading edge flaps coupled with normal flaps... the model configuration in the radio on the "flaps" channel was critical. It also had normal ailerons , elevator and rudder. Each pair of the LE and the main flaps are operated by one servo. Activating the LE flap and the main flaps did allow the aircraft to fly at a higher AoA and slowly .. Would have to improve on the design to make the whole thing more rigid and try it on a larger aircraft

    LARGE POWERED SPAD   A large aircraft made completely out of  coro and PVC pipe ·           72” span, coro wing, Jedelsky airfoil, wooden spar, detachable wings, no dihedral ·           PVC pipe fuse, wing and tail section mounting plates ·           750KV, 12X4 prop, 3S ·           Aileron, elevator, rudder, throttle This large plane is made completely out of coro and PVC pipe. The wings were two piece and has plug-in aluminum joiners. The tail unit (horizontal and vertical) is one piece which can be bolted on to fuse by four nuts. The whole thing can be assembled in field very quickly. It can fly slow. Turns are tight and controlled. The jedelsky  airfoil  did provide high amounts of lift.. and also lot of drag.. that is my son Abhiroop holding th...

An aerobatic plane … not named ·           34” thick (18%) symmetrical airfoil (E 479), aluminium channel spar, coloured tape covered ·           Coro fuse with detachable canopy for access to electronics ·           900KV, 10X4.7 prop, 3S ·           Ailerons, rudder, elevator, throttle Abhiroop (my son) with the aircraft Very responsive in all three axis… good roll rate…. The rudder area was increased later on to enable knife edge.  Glides well for a stunter. … has good stall characteristics (adequate indications by wagging of wings) .. a good aerobatic  aircraft..       Shock Flyer Own Shock flyer design made out of depron. This aircraft has two CF strips glued to either side of wing as spar (very light and rigid (very effective as it subjects the CF ...