Rahul's RC Aircraft and other designs

 This is a build log of  vacuum bagging Here the vertical fins of a swept  flying wing are being vacuum bagged.. The same technique can be used for any part.. (just that this is the one I documented) Of the different methods, this one uses a thin PET sheet as the finishing surface. This is different from using a peel ply. materials:- thin PET sheet, mold release wax, vacuum bag/ polyethylene sheet, vacuum bag sealing tape, some plastic pipe, vacuum pump/ brake bleeding pump. The foam blanks are readied.. making sure that surface finish is good and smooth and the surfaces are cleaned .. it needs to be understood that ANY surface imperfections more than the thickness of the FG cloth will be visible after glassing.. therefore though this step may seem trivial, it is quite important The pet sheet is cut in the shape of the part to be glassed, one for each side. At this stage it is not important for it to be absolutely accurate, I keep  around 1cm excess all around......

 This is a small and simple Prandtl glider Span- 890mm, Root cord = 115mm, Tip Cord = 30mm, Sweep = 24 degree Will try out as a chuck, DLG and tow line It is a fairly simple contraction. The camber drops to 0 degree at 70% of span, and at the tip the camber is 0 and the washout is 9 degrees The topside.  The underside The fuselage is a just a stick to enable a small weight to be put way forward to get the CG right A side view. Notice the washout in the closer tip, the camber at the root  

  A 1500mm size thermal ePowered plank wing. Composite construction Medium AR, low WL .. Elevons moved outboard to enable inboard wing generate max lift during slow thermalling.    Dimension Sketch Airfoil BW050209 Wing area 39.43 sq dm CG @ 10% SM = 100 mm, @ 15% SM = 87 The wing was hotwired out of high density EPS (thermocole). Built-up full length CF spar. Tow width on top 18mm, bottom 24mm. The spar has a 5 x 3 mm vertical balsa compression webbing buried below the CF tow (full length).. The built-up spart is at 33% of cord. The routed 5mm groove for the vertical compression webbing visible. Also you can see the shallow trough which has been sanded for the CF tow cap of the spar. A picture of the wing core with the CF tow for the spar caps. A view of the laid out built-up spar This one shows the vertical webbing Built up spar ..all elements in position and weighed down …. awaiting for the epoxy to cure the wing with the spars in place.. is is...

 Here is a design and drawing of a transmitter tray.. It is designed for Radiomaster TX16S, but could also accommodate other transmitters. I made mine out of 5mm acrylic sheet with 3x10mm brass standoff, and 8mm steel threaded rod... other materials can also be used

 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 swept flying e-powered wing.. this is loosely based on the "Sparian" with changes to the wing and fuselage .. and with e-power. The dimensions : Wing area = 26.85 dm sq, 416 in sq AUW = 650 gms  CG @10% SM = at 148 mm  of RC from LE Wing loading at 650 gms AUW = 7.93 oz/sq ft, WCL = 4.66,  stall speed =  22.2 kmph The wing is hotwired out of XPS (Blucore) and skinned with 80gsm fiberglass (one layer). It has a 10mm wide CF built-up cap spar on top and bottom, across the whole span. It is reinforced with a 30mm wide CF built-up spar to upto 230 mm from root, both top and bottom Fuselage is a simple box made out of coro with bamboo skewers inserted into  the flutes at certain areas for strength.  The wing is mated to the fuselage by two 8mm nylon bolts and then the edges are hotglued. This makes secured seating and at the same time can be disassembled, in case required.  Also vortex generators have been added. 5 sets of VG,s 70mm apart, extending, in t...