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The Nimbus 4 is the fastest glider. The aircraft is produced by Schempp-Hirth.
On Dec. 22, 2006 a Nimbus 4 DM (DM = double Seat/Motor) set the open class world glider speed record of 306.8 km/h (about 190 mph) over a 500 Km (about 310 miles) out and return course. The aircraft was piloted by Klaus Ohlmann.
A total of 38 Nimbus 4 DM gliders have been built to date.
Nimbus 4 DM by ICARE.The ARF has a wingspan of 157" and a length of 53". It has a glass fuse with sheeted foam wings. Typical power can come from a HP 370 motor driving a 22 x 10 prop. Gearing for the motor is 1:1.9 through an ICARE self launch system.
Nimbus 4 by HKM Modellbau. Wingspan is 260" with a fuselage that is 77" long. For easy transportation the 1/4 scale rc airplane has four piece wings. Weight is about 21 lbs.
Nimbus 4 from Tangent Model Tech. It has a wingspan of 236" and a length of 70". The fuse is fiberglass and wings are sheeted with carbon reinforcement. It has a HQ 3.0 airfoil and weighs in at about 16 1/2 lbs.
Nimbus 4 from Airworld Modellbau. It features glass fiber construction with a 209" wingspan. It is 63" long and weighs around 13 lbs.
There is a build thread for a Nimbus 4 semi-scale in RC Groups by Mike Bogh. It has a 6 meter wingspan and weighs around 17 lbs. ready to fly.