Joker

-

A 1m  Thermal flying wing - Plank





Dimensions and details :-


          Electronics

      a.       Motor = 2206 200KV
b.       Prop = 7x4 folding
c.       Bty = 2S  750/1000 mah
d.       ESC = 30A

8.      AUW = 310g,  Wing area = 220000 sq mm, Wing Loading - 4.65 oz/sq ft, Wing cubic loading - 3

The wing is hotwired from EPS (Thermocole). It has a built-up 10mm CF tow spar  and skinned with 32 gsm fiberglass at 45 degree bias. the wing tips are EPP . The fuselage is only in the front portion to house the ESC, RX, Motor and battery.. The vertical tail is stuck on a 3 mm CF rod and glued to the wing TE.

The elevon is 3mm balsa sanded to a thin TE. The elevon is bottom hinged

In the final version, the servos were moved inwards and positioned at the centerline/RC. The topside color of the wing was changed to white and yellow. And the rudder surface area was increase a bit by adding a leading stake.

Once trimmed it is a great thermal flyer, indicates thermal and stays in the thermal very nicely, even in the small ones  .. Also has a very good glide which enables it to transition from one to another. On a not to calm day 30gms of ballast at the CG , with a slightly (couple of mm) forward CG  makes it fly with authority... Great aircraft for thermal flying 

Here is a link to one of the flight videos     https://www.youtube.com/watch?v=s7lBZY6r_bI

A better flight with thermal soaring is here       https://youtu.be/AkRjh4RjzFU

Comments

Post a Comment

Popular posts from this blog

Flipper - Plank flying wing SAL

-
Image
 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...
Read more

Angor-Rot & Hot-Rod hotliner RC plane

-
Image
 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...
Read more

WitchCraft

-
Image
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...
Read more