Very interesting and fun data. I was curious to determine which glider had the "highest" count. Of course as this is based on the ContestID, and a specific glider can be used by others, sold, etc, take the numbers with a grain of salt.

Interesting Factoid - there were 57 one-off unique gliders. These are listed below.

The top 100 models of gliders in order is;

SGS-1-26 564
Ventus 218
Discus 183
ASW-27 172
ASW-20 101
LS-8 83
ASG-29 74
DuoDiscus 71
LS-4 61
PW-5 60
StemmeS-10 51
StdCirrus 47
ASW-24 43
LS-6 40
LS-3 39
LAK-17 39
H-201Libelle 34
ASW-28 32
HPH-304 31
DG-800 30
SZD-55 28
ASW-19 26
Nimbus-3 26
DG-1000 25
Arcus 23
ASH-26 22
JS-1 22
PIK-20 21
ASH-25 20
ASK-21 20
ASH-31 15
SZD-42Jantar 15
DG-300 15
Genesis 13
Glasflügel303Mosquito 12
ASW-15 12
SilentS2 11
DG-808 11
DG-400 11
Blanik-L33 11
304C 10
SparrowHawk 10
Ka-6 10
Mini-Nimbus 10
Nimbus-4 10
RussiaAC-4 9
Cirrus 9
H-301Libelle 9
DG-303 9
DG-505 9

One-Off Gliders
(there has to be some errors in this with the wrong model number listed)

2CM
AC4C
AFH-3
Apis13
ASG-31
ASK-14
ASK21
AustriaSH-1
B-4
Bergfalke3
Bielsko1
Blanik-L23
BS-1
CherokeeII
Concept-70
Concordia
Diiscusb
DuckHawkSV
eDuoDiscus
Egret
ElfeS-3
Extreme
Glasflügel206Hornet
Glasflügel604
GrobTwin
H-201Stan
HP-11
HP-16T
HP-18A
J.LS-4
Ka-8
KatanaExtreme
L-13Blani
L23W
LETL-33
LHP-18
LP-15Nugg
LP-15Nugget
LPH18
LS-18
NG-1
PhoebusB1
Promyk
PZLKrosnoKR-03APuchatek
RS-15
SGS-1-34
SGS-1-35C
SGS-1-36
SlingsbyVegaT65
StandardC
StdAustria
SW-27
SZF24FoKa-4
Tetra15
TST-14M
TwinAstir
Woodstock-11.9