Grob 103 Twin II Acro, 228BG, Performance Summary

The data on this page are gathered from the factory published owners manual and are deemed to be correct.
However, it is the pilots sole responsibility to verify and fly the a/c within the limits of factory published information.
Weight and Balance
Empty Weight 916 lbs.
Maximum Weight 1279 lbs.
Maximum Useful Load 363 lbs.
Minimum front seat load for all flights* 170* lbs.
Maximum Front Seat Load 242 lbs.
Maximum Rear Seat Load 242 lbs.
Maximum Bagage Compartment Load 22 lbs.
Trim Weights must be installed if front seat load is less than 170 lbs.
Front Seat Pilot Weight 121-137 lbs 138-153 lbs
Number of Trim Weights 2 1
Air Speeds
Maximum Speed calm air Vne 135 Kts
Maximum Speed to Deploy Spoilers V 135 Kts
Maneuvering Speed Va 92 Kts
Maximum Aerotow Speed Vt 92 Kts
Minimum recommended approach speed Vref 51 Kts
Maximum crosswind component V 11 Kts
Stall Speeds Without Dive Brakes With Divebrakes
Solo 36 Kts 40 Kts
Dual 40 Kts 46 Kts
Flying in rain raises stall speeds by 6 Kts. With wet wings
increase take-off and approach speeds accordingly.

True airspeed is greater than indicated at altitude. Vne
decreases according to the following table.
Altitude 0-10,000' 13,000' 16,000' 19,000'
Vne 135 Kts 121 Kts 115 Kts 109 Kts
Speeds to Fly Solo Dual
Minimum Sink 43 Kts 46 Kts
Best L/D ~36/1 51 Kts 57 Kts

Glider N228BG Documents

G-103 Checklist
Weight and Balance 2013 April

Glider Manuals

Twin II Flight Manual
Twin II Maintenance Manual
Twin II Repair Instructions
2014 TDSC G39EU

Equipment Manuals

GB-FSG 70-FSG71M Operation
Dittel FSG70 Squelch Adjustment
Ricco variometer manual
RICO Model 3000 VACs Variometer
RICO two page
Winter 6FMS423 Airspeed Indicator Information
Winter STV-5 Variometer Installation Manual
Power FLARM Butterfly Display Manual
Power FLARM Core Manual