BGA glider data sheet - Grob G103C Twin III & Twin III Acro

Type: Grob G103C Twin III

Data source: Manufacturer’s flight manual Date of issue: 7.10.91

Manufacturer: Grob Present Type Certificate holder: LTB Lindner, website www.ltb-lindner.com.

UK Agent: Soaring Oxford Email: soaring.oxford@virgin.net Phone: 01636 525318 Fax: 01636 525287

Link to mandatory mods: http://www.ltb-lindner.com/g-103-ad-sb.html

Weighing Data:
Max weight (dry)
BGA concession non-aerobatic max weight (dry) [+3%]

Kg Pounds 600 1323 618 1363

Max weight of non lifting

420 926

components (everything except wings)

BGA concession non-aerobatic
max weight of non lifting components [+5%]
Max pilot weight (seat load)

441 972 110 242

mm Inches

Forward C of G limit (aft of datum) 270 10.6

Aft C of G limit (aft of datum)

480 18.9

Front pilot position (forward)

1132 44.6

Rear pilot position (aft of datum) 35 1.4

Control deflections in mm

Up Down Distance - Max

hinge to

free

measuring point

play

Ailerons 67 - 45 - 215 83 55

+/-8 up +/-5 dn

Elevator 94 - 68 - 240 110 80

+/-8 up +/-6 dn

Airbrakes 127 up at inner end

Rudder Left & right 223 - 243

450

+/-5 L +/-10 R

Longitudinal datum: Wing root LE at rib

Horizontal datum: Top of rear fuselage 1000: 40 tail down.

Maximum speeds

VNE Rough air Manoeuvre Aerotow

Twin III & Acro

Without SB 315-66/1

Knots

Kph

135 250

92 170

92 170

92 170

Twin III Acro With SB 315-66/1 Knots Kph
151 280
108 200
100 185
100 185

VNE at altitude Feet 0-6562
6562–9842
9842–16404

Twin III & Acro Without SB 31566/1
Knots Kph
135 250
128 237
121 225

Twin III Acro With SB 31566/1
Knots Kph
151 280
143 265
130 240

Airbrakes open 135

250 151

280

16404–22966 115

213 116

215

Winch / auto tow 76

140 76

140

22966-29528 109

202 103

190

Max winch weak link:- 862 Kg (Tost brown)

Tyre pressures:

Main 36 – 40 psi , nose and rear 36 psi

For control surface max weights and moments see the manufacturer’s maintenance manual.

Note:- SB 315-63/2 reduced speeds and prohibited aerobatics on all models. This was replaced by SB 315-65/1 which raised speeds but not to the original non-Acro values & made all models non - aerobatic and non-cloud flying because the airbrakes could not limit the gliders to the reduced VNE in a 45° dive. If SB 315-66/1 is carried out (optional fuselage strengthening) to an Acro it returns to the original speeds, cloud flying and aerobatic status.
Compiled by: Tim Macfadyen & Afandi Darlington 10 July 2003 Updated 21 April 2011 Type Cert holder changed.
Updated 10 Aug 2015 SB 315-65/1 limitations & SB 315-66/1 (optional strengthening Mod) data included.