Fly Electric!

Fly Baby

3-Views
42 kb
Landings at walking speed
58 kb
Side shot
52 kb
Ready for covering
39 kb
Inside view
45 kb
EFI cover
49 kb
RCMW cover
57 kb
EFI cover
24 kb

If you want a large aircraft with magnificent flying characteristics, this is it. It has exceptional slow speed characteristics and is very easy to fly. Despite it's size and drag, it handles wind remarkably well and flight duration is excellent. Ailerons are positive in normal flight, and a little rudder is mainly only needed in strong winds or when 'hovering' on the stall. Loops are straight forward, but rolls are poor (the prototype has a slow 'roll' rate and probably has never actually been rolled!). Touch and goes are a delight, although landings can bounce a little given the fixed undercarriage.

Wing span: 108"
Wing area: 1700 sq"
Wing loading: 18 oz/sq' (RC2000's)
20 oz/sq' (CR3000's)
Weight: 13.25 lb (RC2000's) or
15 lb (CR3000's)
Motor: Astro 60 Cobalt #662 (Sport)
Gearbox: ModelAir Tech H1500 belt drive 2.31 : 1 (quieter than gears)
Prop: Master Airscrew 22x12
Prop speed: 3600 RPM
Batteries: 30 x RC2000 or
30 x CR3000
Motor current (full power): 27A
Motor power: 875w
Power loading (input): 66 w/lb (RC2000's)
58 w/lb (CR3000's) and still ample power (I use this combination for competing against 'power' models in Scale competitions).
Flight times: 7-9 minutes (RC2000's)
9-12 minutes (CR3000's)
Shorter times represent competition flying or strong wind conditions where high power levels are required
Receiver: Futaba R138DF 8ch dual conversion
Servos: 2 x Futaba 9202 (Elevator/Rudder)
2 x Futaba 3001 (Ailerons)
Speed control: Astro 204D (or Jeti JES40)
Rx battery: 700mah 4 cell nicad
Aircraft design: Own design from scale 3-views. The plans and cowl are now available from EFI magazine (plan number MW2780) with the construction article appearing in the Feb'00 issue.
Airfoil: NACA 4412 (scale)
Wing construction: Two piece; spruce spars (each 1/4 x 1/4"); 3/32" balsa ribs; cap strips; 1/16" leading edge balsa sheeting; built-up ailerons
Fusalage construction: Traditional open structure with 1/4 x 1/4" hardwood top longerons and mostly 1/4 x 1/4" hardwood or balsa elsewhere; 3mm Depron foam between diagonals to simlulate solid sides without adding weight (47g both sides!)
Undercarriage: Fixed; laminated 1/8" lite and 1/16" hard ply legs; 6.5 x 2.25" 'kneeling pad' foam wheels; steerable tail wheel; float mount (just in case I'm tempted!)
Covering: Solartex (red); Black areas sprayed
Extra features: Functional flying wires (75lb); connectors to make assembly quick; very quiet given low motor RPM and belt drive; removable stabilisers (functional wires again); very responsive elevators; fibreglass cowl
What would I do differently?: Beef up construction of the stabilisors slightly (reshrinking the Solartex after a year has resulted in some distortion).
I originally used part balsa wing spars (on the top) but spruce or similar hardwood is shown on the published plans which is what is recommended.
The plans also show the use of blind nuts to retain the wings to the fuz as the original self-tapping screws into ply stripped the thread and came undone.
That's it! (promise) but let me know if you experience any problems...

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