BGA glider data sheet - Twin Astir & Twin Astir Trainer

Data source: Manufacturer‟s flight manual

Date of issue: May 1978

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: www.ltb-lindner.com/g-103-ad-sb.html

Weighing Data:

Kg Pounds

Max weight (with or without water) 650 1435

BGA concession non-aerobatic max weight (dry) [+3%]
Max baggage
Max weight of non lifting components (everything except wings)

669
10 470

1478
22 1036

Control deflections in mm
Up Down Distance - hinge to
measuring point

Ailerons 90 ±10 45 ± 8 208

Elevator Rudder

91 ± 6 71 ± 5 222

Left & Right 233 ± 10

450

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

493 1088 110 242

mm Inches

Forward C of G limit (aft of datum) 260 10.24

Aft C of G limit (aft of datum)

460 18.11

Front pilot position (forward)

1150 45.28

Rear pilot position (aft of datum) 40 1.57

Airbrakes Fully extended Measure at

170 ± 10

outboard end

Controls Moments & Moments

weights [all ± 12%]

cm Kg

Elevator

25,8

Rudder to serial 3072 24,9

Rudder serial 3073 on 0 - 10

Aileron to serial 3072 23,0

Aileron serial 3073 on 0 - 6

Weights Kg 5,2 6,5 8,0 5,7 8,0

Elevators without mass balance, weighing 3,1 - 4, 4 Kg, are acceptable with moments of 19 - 29 cm Kg.

Longitudinal datum: Wing root LE at rib

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

Maximum speeds

Knots Kph

Knots Kph

VNE at altitude Knots Kph

VNE

135 250

Aerotow

92 170

0-6500 feet

135 250

Rough air 108 200 Winch / auto tow 65 120 6500–10 000 128 237

Manoeuvre 92

170

Airbrakes open 135

250

10 000–13 000 121

225

13 000–16 500 16 500-19 000‟

115 109

213 202

Max winch weak link: 850 Kg (Tost brown) Tyre pressure:Main 2.5 - 2,8 atm 36 – 40 psi , rear 36 psi
Semi aerobatic, cloud flying permitted
Notes: The “Trainer” is a version of the Twin Astir with a fixed undercarriage, no water and a disk wheel brake.

This sheet compiled by:

Tim Macfadyen

Date: 10 September 2002

Last update 21 April 2011 Type Certificate holder changed

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