BGA glider data sheet - Grob 103 Twin II & Grob 103A Twin II Acro

Data source: Manufacturer’s flight manual

Date of issue: December 1980

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:

Control deflections in mm

Max weight (dry)

Kg Pounds 580 1279

Up Down Distance - hinge to
measuring point

BGA concession non-aerobatic max weight (dry) [+3%]

597 1317

Max weight of non lifting

400 882

components (everything except wings)

BGA concession non-aerobatic

420 926

max weight of non lifting

components [+5%]

Max pilot weight (seat load)

110 242

Max baggage

10 22

Ailerons 90 ±10 50 ± 8 208

Rudder Airbrakes

Left & Right 233 ± 10
Fully extended 170 ± 10

450
Measure at outboard end

Elevator 3501-
Glider serial 3729 number

Option 35013729

3730 - 3839 - 3879 3838 3878 on

Forward C of G limit (aft of datum) Aft C of G limit (aft of datum)

mm 260 460

Inches 10.24 18.11

Front pilot position (forward)

1150 45.28

Rear pilot position (aft of datum) 40 1.57

Up 90±6

Down

70±5

Measurement point to hinge
Trim tab
Up

212 45±5

Down

60±5

Measurement 96 point to hinge

97±8 76±6 233
54±5 72±6 116

97±8 76±6 245

95±8 74±6 240

95±8 74±6 240

70±7 70±7 90

45±5 45±5 60

Spring trim (no tab)

Longitudinal datum: Wing root LE at rib Horizontal datum: Top of rear fuselage 1000: 40 tail down.

Each standard (5.6 Kg) trim weight in the nose reduces the minimum front pilot weight by 7.5 Kg (17 lb).

Maximum speeds

Knots Kph

Kn Kph ots

VNE at altitude Knot Kph s

VNE

135 250

Aerotow

92 170

0-6500 feet

135 250

Twin II & Acro without SB 92 170 315-66/1 rough air & max manoeuvre
Twin II Acro with SB 315- 97 180 66/1 rough air & max manoeuvre

Winch / auto tow 65 120 Airbrakes open 135 250

6500–10 000 128 10 000–13 000 121 13 000–16 500 115 16 500-19 000’ 109

237 225 213 202

Max winch weak link: BGA figure 850 Kg (Tost brown)

Tyre pressure:Main 2,8 atm 40 psi , nose & tail 2,5 atm 36 psi

G 103A Acro modified as per SB315-66/1 (rear fuselage strengthened) “G” limits: - +6.5 & - 4 up to 97

knots, + 5,3 & - 3 to VNE. Otherwise semi-aerobatic.

Cloud flying is permitted.

For control surface max weights and moments see the manufacturer’s maintenance manual page 17a.

Note:- SB 315-63/2 reduced speeds and prohibited aerobatics on all models. This was replaced by SB 315-65/1 which raised speeds to the original non-Acro values & made all models semi aerobatic and cloud flying. If SB 31566/1 is carried out (optional fuselage strengthening) to an Acro it returns to the original speeds and aerobatic status.

This sheet compiled by: Tim Macfadyen 2 Nov 2004 Updated 21 April 2011 Type Certificate holder changed.

Updated 10 Aug 2015 SB 315-65/1 limitations & SB 315-66/1 (optional strengthening Mod) data included.