The data on this page is gathered from the factory published owners manual and are deemed to be correct.
However, it is the pilot’s sole responsibility to verify and fly the a/c within the limits of factory-published information.

Weight and Balance
Empty Weight 806 lbs.
Maximum Weight 1320 lbs.
Maximum Useful Load ? lbs.
Minimum front seat load for all flights* 154* lbs.
Maximum Front Seat Load 242 lbs.
Maximum Rear Seat Load 242 lbs.
Maximum Baggage Compartment Load 22 lbs.

Weight disks must be installed if front seat load is less than 154 lbs.

Front Seat Pilot Weight lbs 154.32 151.37 148.81 146.06 143.3 140.54 137.79 135.03 132.28 129.52 126.77 124.01 121.25
Number of disks 0 1 2 3 4 5 6 7 8 9 10 11 12

1 disk = 2.2 lbs (1 KG) actual weight

1 disk = 2.76 lbs front seat pilot weight

Air Speeds
Maximum Speed calm air Vne ? Kts
Maximum Speed to Deploy Spoilers V ? Kts
Maneuvering Speed Va ? Kts
Maximum Aerotow Speed Vt ? Kts
Minimum recommended approach speed Vref ? Kts
Maximum crosswind component V ? Kts
Stall Speeds Without Dive Brakes With Divebrakes
Solo ? Kts ? Kts
Dual/  Kts ? 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.

Vne
Altitude 0-10,000′ 13,000′ 16,000′ 19,000′
Vne ? Kts ? Kts ? Kts ? Kts
Performance
Speeds to Fly Solo Dual
Minimum Sink ? Kts ? Kts
Best L/D ~36/1?  ?Kts ? Kts

Glider N521CP Documents

Schleicher ASK21 Checklist
N521CPY Loading Graph
2012 N521CP Weight and Balance

Glider Manuals

Schleicher N521CP USA ASK21 Flight Manual
Schleicher N521CP USA ASK21 Maintenance Manual

Equipment Manuals