Game Composites GB1 GameBird, Руководство по обслуживанию

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Maintenance Manual GB1 GameBird
Page date: April 24, 2020
51-7
Fabric preparation and handling
1. Clean and even table, cover with plastic film
2. Roll out fabric as much as required
CAUTION: Always wear medical examination gloves when handling fabric,
skin contact can reduce the adhesive properties of the fabric!
3. Straighten fabric, check for imperfections
4. Use scissor to cut as required
Resin Mixing
The amount of resin required equals the weight of the fabric to be impregnated.
CAUTION: Do never mix less than 50g of resin plus hardener to minimize tolerances!
1. Check resin and hardener for expiration dates and condition (no crystallization)
2. Place empty and clean cup on scale, set scale to zero
3. Pour resin in cup
4. Pour hardener in cup, accuracy ±1gram
5. Use wooden tongue depressors to mix content until no more streak formation can be observed
and liquid appears clear
CAUTION: Pot life starts from the moment the ingredients become mixed!
Bonding Material Mixing
Various bonding mixtures, all based on resin mix, are used throughout the GB1 structure.
The type of mixture for each bond or area is specified in the relevant drawing / Work Instruction.
Table for designations and mix ratios:
Designation in Work
Instruction Resin / Hardener
mix in grams Flocks in grams Microballoons
in grams Aerosil
CF - Flocks 50 / 100 / 150 / 200 10 / 20 / 30 / 40 N/A N/A
MB - Microballoons 50 / 100 / 150 / 200 N/A 14 / 28 / 42 / 56 N/A
FM – Flocks / Microballoons
Mix
50 / 100 / 150 / 200 7.5 / 15 /
22.5/30 4.5 / 9 / 13 / 17 N/A
HS – Honeycomb / Skin Bond 50 / 100 / 150 / 200 6 / 12 / 18 / 24 N/A N/A
Wing Fuel Tank sealing 50 / 100 / 150 / 200 N/A N/A 2.5/5/7.5/10
Repairs to All Composite Structures, General
Chamfer
To achieve similar strength as the surrounding undamaged structure,
material specific overlap lengths have to be respected:
Glass fiber 1 : 40, i.e. 1 mm material thickness requires a 40 mm overlap
Carbon fiber 1 : 80, i.e. 1 mm material thickness requires a 80 mm overlap
For calculating the size of the overlap patch, the minimum ratio of overlap length ratio to fabric thickness is
1:50. This length may not be less than 20 mm.
Examples:
Repair is six layers of C200 which has a layer thickness of 0.33 mm. Thickness is 1.98 mm so
minimum overlap is 99 mm.
Repair is two layers of C93 which has a layer thickness of 0.14 mm. Thickness is 0.28 mm so
minimum overlap is 20 mm.
After the repair area has been prepared, it must be cleaned before starting the repair.
Remove the sanding dust with a vacuum cleaner and clean the scarfed overlaps with acetone in case there is
any grease or dirt in this area.