The Hobbico Classic Biplane has a 20" wingspan and resembles the old Beech Model 17 Staggerwing. It is a relatively easy project to convert this $15 classic scale electric free-flight plane to R/C using the Cirrus Micro Joule Flight pack.
After gutting the stock power system, it weighed in at 1.4oz.
The wings weighed 0.7oz together and the empty fuselage was 1.1oz.
For a light power system that draws less than an amp, the
Astro Flight Firefly is a good choice. I have used this power system on other
Mounting the MJ servos was easy. I simply cut slots into the side of the fuselage and press fit the 0.1 servo in place. No glue was needed.
I replaced the cut out foam with a few balsa pieces; one to hold the 2-cell Kokam 145mAh pack and the other as a press-fit hatch.
Hobbico Classic Bipe Video (5meg)
This is the maiden voyage of my converted Hobbico Classic Bipe
using the Cirrus MJ Flight Pack and Astro Flight Firefly motor on a 2-cell Kokam
145 pack. This model resembles the old Beech Model 17 Staggerwing and flew