These are pillow bladder tanks designed to fit industrial UAVs and competition models.
They can be shaped for wings ( triangular pillow shape ) or fuselages ( square pillow shape ).
These tanks are available in many sizes. Dimensions can be custom designed on request. Example of sizes are as followed ( maximum length 80 cm ):
25 liters fuselage ( rectangular 80 cm by 39 cm outer size)
20 liters fuselage ( rectangular 75 cm by 36 cm outer size)
15 liters fuselage ( rectangular 71 cm by 33 cm outer size)
10 liters fuselage ( rectangular 56 cm by 30 cm outer size
7 liters fuselage ( rectangular 42 cm by 30 cm outer size)
5 liters fuselage ( rectangular 41 cm by 26 cm outer size)
4 liters fuselage ( rectangular 37 cm by 25 cm outer size)
3 liters fuselage ( rectangular 33 cm by 23 cm outer size)
2 liters fuselage ( rectangular 31 cm by 20 cm outer size)
20 liters wing ( triangular 60 cm by 50 cm )
15 liters wing ( triangular 50 cm by 40 cm )
10 liters wing ( triangular 40 cm by 30 cm )
5 liters wing ( triangular 40 cm by 20 cm )
They are designed to work as a non vented/ air-free system.
( 15 liter wing bladder seen below )
Each bladder is custom built to your specifications ( please contact us with your maximum compartment dimensions and desired fuel capacity ). It is made from a single layer or double layer specialized membrane ( specified for lifetime kerosene resistance and weldability ) as well as viton tubing.
The welds consist of 2 zones of 8 mm fused material with a 4 mm gap in between. This allows to spot a weld failure ( fuel injection in the buffer gap ).
Bladder internals comprise of the following:
1 aluminum fuel manifold inlet port, fed by an air separator filter ( up to 20 mm output port for fast jettisoning ). This act as an integral air trap.
1 fuel fill/ air bubbles drain port. This port is connected to a dual loop air breather tube system that collects the air bubbles during the air purging sequence of the fuel fill and prevents vacuum lock at low fuel levels.
Here is a view of a 15 liter wing unit fully de-fuelled, showing the vacuum lock prevention feature..
All the internals are safety wired with chromel wire that is covered with a heat shrink tube for scratching/ cutting prevention.
The fuselage bladders incorporate 2 channels and a set of carbon tubes that are used to suspend the bladder between bulkhead ( see product picture ).
The wing bladders are best fitted with velcros set on the lower skin and will remain in position by gravity in the wing compartment.
All the ports are fitted with industrial grade Pisco push-to-connect fittings in 4 mm, 6 mm , 8 mm, or 10 mm OD.
This product cannot be fitted in RC models in the USA and Canada as not AMA legal.