Experimental Model 'X' - 1/5th scale
21sep99
Key Dimensions (basis for estimates)     (metric) (imperial)
  Prototype  
  Wingspan (30') m 9.1 in 360.0
  Wing chord (est/ave) m (ave) 1.4 in (ave) 54.0
  Wing area sqm 12.5 sqft 135.0
  Fusalage length m 5.6 in 221.0
  Model  
  Scale 5.0  
  Wingspan m 1.829 in 72.0
  Wing chord m (ave) 0.274 in (ave) 10.8
  Wing area sqm 0.502 sqin 777.6
    Fusalage length     m 1.123 in 44.2
Measure (g) (oz)
Motors 472.8 16.7
Astro 40G g 208 430.7 15.2
Wire/plug m 0.5 42.1 1.5
Props 42.0 1.5
13x8 MA g 22.0 0.8
Spinner g 20.0 0.7
Battery pack 1062.0 37.5
3000's cells 0 0.0 0.0
2000's cells 18 1062.0 37.5
Speed control 52.0 1.8
Jeti Jes60 Est. 52.0 1.8
Radio 394.2 13.9
Receiver Est. 31.4 1.1
Aileron servos 2 90.0 3.2
Elevator/Rudder 2 90.0 3.2
Retract servo 1 50.0 1.8
Aileron extension leads (1000mm) 2 18.8 0.7
Wing extension leads (400mm) 2 10.0 0.4
Rx battery 700mah Actual 93.7 3.3
Rx switch (3 lead) Actual 10.3 0.4 71.4 Motor/Radio
Fuz 783.5 27.6 55.2 Airframe
Longerons (6 x 6mm hardwood x4) 1.123 64.7 2.3
Diagonals, etc (3 x 6mm balsa) 1.123 19.4 0.7
Bulkheads/formers Est. 20.0 0.7
Stringers (3 x 3mm balsa x10) 1.123 13.5 0.5
Gussets (1/64 ply) Est. 10.0 0.4
Front sheeting (1/16" balsa) 0.100 40.0 1.4
Turtle deck sheeting (1/16" balsa) 0.400 160.0 5.6
Canopy Scale 5 60.0 2.1
Wing attachment (3mm ply?) Est. 40.0 1.4
Wing fillets Est. 40.0 1.4
Servo tray Est. 20.0 0.7
Battery tray Est. 30.0 1.1
Firewall/motor mount Scale 5 55.2 1.9
Cowl Scale 5 139.8 4.9
Tail wheel/assembly Est. 20.0 0.7
Silk/Dope/Paint 1.123 30.9 1.1
Elevator pushrod Est. 10.0 0.4
Rudder control wires Est. 10.0 0.4
Tail (est) 175.8 6.2
Stab Scale 5 55.8 2.0
Elevator Scale 5 34.8 1.2
Fin Scale 5 22.2 0.8
Rudder Scale 5 27.0 1.0
Silk/Dope/Paint Scale 5 36.0 1.3
Wing 606.0 21.4
Spars (6 x 6mm spruce x 2) Span 1.829 38.9 1.4
Ribs (3mm depron x 28) # 36 36.0 1.3
Webbing (1/16" x 20~55mm balsa) 1.829 16.1 0.6
L/Edge (6 x 6mm balsa) 1.829 6.6 0.2
T/Edge (6 x 6mm balsa) 1.829 6.6 0.2
Wing tips (6 x 12mm balsa x 2) 1.829 10.5 0.4
Top Sheeting (1/16" balsa l/edge 'D') Area 0.502 30.1 1.1
Bottom Sheeting (1/16" balsa l/edge 'D') 0.502 30.1 1.1
Servo mounts Est 2 40.0 1.4
Wing fuz mount Est. 20.0 0.7
Wing tip joiners (200mm carbon/brass x2) Est. 0.0 0.0
Ailerons
L/Edge (3 x 12mm balsa x 2) 1.829 3.8 0.1
Ribs Est. 10.0 0.4
Sheeting (1/16" balsa) 1.829 21.9 0.8
Retract units Est. 100.0 3.5
Mounts Est. 100.0 3.5
Wheels Est. 60.0 2.1
Collets Est. 10.0 0.4
Silk/Dope/Paint Area 0.502 55.2 1.9
Pushrods Est. 10.0 0.4
TOTALS 3588.3 126.6 7.9
lb 7.91
Wing area (in) 778
Wing loading (oz/sqft) 23.4
Current (amps) 40.0
Voltage (est.) 18.0
Motor power (w) 720
Power loading (w/lb) 91
Motorcalc
Total weight 126.6
Astro40 13.0
Batteries 36.9
Speed control 2.0
Airframe (balance) 74.7