I'd like to thank Tim Waterhouse for providing the spreadsheet that this page is based on.  While I believe the numbers to be accurate, I do not recommend they be used in lieu of the figures listed in the POH  for any glider. Remember, the Pilot's Operating Handbook is the final authority for all glider performance figures, and should be referred to by all pilots for flight planning.

 

GROB 103 SGS 1-26 (Speeds in KNOTS)
V(MPH) S D V(knots) Single
VNE 155 Best L/D 59 66 VNE 92 Best L/D 39
VBRAKE 155 Min Sink 49 53 VBRAKE Min Sink 33
VTOW 105 VS 41 47 VTOW VS 25
Vruf Air 105 WEIGHTS Vruf Air WEIGHTS
VA 105 Min Front Seat 154 VA 58 Min Front Seat 135
Max Front Seat 242 Max Front Seat 220
Useful load 429
K-13 SGS 1-26 (Speeds in MPH)
S D
V(MPH) V(MPH)
VNE 125 Best L/D 50 55 VNE 104 Best L/D 45
Vruf air 87 Min Sink 40 43 Vruf air Min Sink 38
Vtow 87 VS 35 38 Vtow VS 28
Va 87 WEIGHTS Va 65 WEIGHTS
Min Front 143 Gross 840
Max Front 220 Useful load 270
Useful load 410
GROB-102 SGS 2-33
V(mph) S V(MPH)
VNE 155 Best L/D 58 VNE 98 Best L/D 45
Vruf air 155 Min Sink 47 Vruf air 65 Min Sink 38
Vtow 105 VS 37 Vtow VS 31
Va 105 WEIGHTS Va 65 WEIGHTS
Min Front 154 Gross Wt 1040
Max Front 242
Useful load 281 Useful load 440
SGS 1-34
V(MPH)
VNE 135 Best L/D 55
Vruf air 83 Min Sink 49
Vtow 55-60 VS 36
Va 83 WEIGHTS
Vbrake 142 Min Front 153
Max Front 220
Useful load 270