Jungster
A sport-scale biplane for electric power
The Jungster is loosely based on the Bücker Bü 131 Jungmann, a German two-seat aerobatic and training biplane. Fred Ewing designed the model to be a lightweight, three-channel fun flyer with simple construction.
To keep with the design goals, only a small portion of the fuselage is sheeted with 1/32-inch balsa. Formers and stringers are supported by diagonal crossbraces for additional strength. No sheeting is required on the wings.
Fred powered his 31-inch-wingspan Jungster with a brushed GWS EPS-350C motor and an 8.4-volt, 750 mAh NiMH battery. It hit his target weight of less than 1 pound. Substituting a brushless motor and a Li-Poly battery could save an additional few ounces.
Fred noted that the aircraft was capable of performing loops, spins, and rudder rolls. Takeoffs and landings were reported to be non-issues, with the recommendation to carry a bit of power during landing.
The Jungster was featured in a construction article in the September 2007 Model Aviation (MA). Its AMA Plans Service listing number is 1007, available for $19 plus shipping and handling. See page 171 or go to www.modelaircraft.org/plans.aspx for ordering information.
Transcribed from original scans by AI. Minor OCR errors may remain.
