RE: Improving the Great Planes DC-3
After trying out the kit's supplied 5x4.3 propellers, I tested various
propellers to measure static thrust, current draw, and rpm. The stock props
produce 10 oz static thrust at 11.8K rpm, 21.3 amps with the stock NiMH
1800 mah battery pack. APC 7x4s produce 18 ounces thrust at 9.2K rpm,
26.6 amps - but also note that this high power is only needed for takeoffs.
These are actual measurements, not sim values.
With the thrust available from the larger prop disc, the plane is now a delight to
fly. Try the 7x4s, you won't be sorry. This is also less expensive than motor
or battery swapouts (that can be tried later).
Pete Young
R/C Report Magazine