Rahul's RC Aircraft and other designs

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 ...

Some of my earlier  models.  I do my design calculations, and draw straight on foam or newspaper templates … hence no plans. HIGH WING TRAINER This is one of my earlier planes.. called it the ‘Phantom Flyer’ ·           40” span, ClarkY airfoil, hotwired, coloured tape covered.. the wing has an aluminium channel spar in the centre ·           Coro box fuse ·           1000KV, 8 X 3.8 prop, 3S ·           Elevator, rudder and throttle Flies well. Does ROG and glides nicely….. a real trainer, can take on a lot of abuse… flies hands –off  after trimming....  (these photo was taken after they were  retired and was being given to a friend.... hence no electronics) HIGH WINGER Another  high-winger… not given it any name          ...

After learning hotwire wing core cutting and covering them with newspaper .. there was no looking back.  COMBAT WING A Large wing... it is Abhiroop, my son, in the picture.. he now flies very well  ·           46” span, 12” root cord, 5” tip cord, 22 degree sweep, semi symmetrical airfoil (MH 64), hotwired,  paper covered. CF spar ·           1200KV, 8X4.7 prop , 3S This was my first real airfoil (other than flat plates) wing. … and if flies like a dream.  Its glide angle is superb… and so is the roll rate.  It is fast and roll like a drill or trimmed to fly hands-off. Initially it was foam covered with coloured tape but once I discovered paper covering and changed over to paper. The paper covering gives it lots of rigidity …  along with very close adherence to airfoil geometry for fantastic performance.  I fly it with a 2200 mah. TRA...

Always wanted to build an autogyro, and finally built and flew one . This thread  has snaps and writeup on the build. This is based on the “twirl”  of which there is a lot of info on the web.. here is the link  http://my.pclink.com/~dfritzke/twirl.pdf.   There are some changes to the materials used vis-à-vis the plan, and they are fine so long as AUW (@200) is kept under check and structural integrity is not compromised. Mine was made out of 5mm biofoam , and CF scraps which I had. The plan is fairly simple. The parts  are cut out of 5mm biofoam.. I have used a 3mm cf rod in the fuse  for strengthening the fuse along with the doublers at the nose end. Note the front end is cut at an angle which has the downthrust built it. Also below the wing mount I have glued in some scrap foam to have a bit more area for the wing to glued to.  The undercarriage spring wire is fixed to a small block of wood I fixed it by bending the wire, tying it with stro...