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Carbon Composite Pipes & Mufflers : GENERAL INSTRUCTIONS Revision G

The Salisbury Carbon Fibre Pipes & Mufflers are the result of many years of constant development, featuring ;

ü Low weight - between 10% and 50% lighter than metal.

ü Exceptional strength for weight. Far stronger than alloy.

ü Dent resistant, and less prone to fatigue.

ü Very quick heat dissipation, giving excellent cooling and lower operating temperatures.

ü Depending on the pipe’s use, generally much quieter and / or more powerful than equivalent metal pipes.

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Features to Note

Due to the different materials used in Salisbury pipes and mufflers, several unusual features need to be noted.

1. salisbury Pipes and mufflers will change colour with the heat. This makes a very good temperature gauge. The hotter the pipe the darker the colour, and visa versa.

2. The pipes may make some 'crackle and pop' noises during the first few runs.

3. This is caused by the dissipation of any moisture trapped in the laminate. Factory oven curing removes an estimated 95% of the moisture, the final 5% will slowly dissipate during use.

4. The pipes have an unusual smell, which will eventually ease with the pipes use (moisture evaporation).

5. Our Special Resin & Carbon Fibre will withstand exhaust temperatures ... PROVIDING the pipe is well cooled.

6. DO NOT insulate the pipe. These pipes rely on their ability to dissipate heat through cooling to atmosphere.

7. In some circumstances, the pipe may 'weep' exhaust gases. Weeping is more likely to occur if the pipe has been 'run hot' (engine too lean or poor cooling), especially in it's first few flights. It is best to make sure the first few flights are ‘rich’. The weeping is caused by the expansion of the Carbon Fibre weave or pinhole caused by the ‘popping’ of moisture trapped in the laminate (see note 2). There is no detectable power loss from the weeping.

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Using Salisbury Pipes & Mufflers

1. The pipes are given a basic cleaning before packing. To clean, wash out with thinners or methanol & blow dry.

2. Make sure the silicon joiner, is a good fit and in good condition. Nylon cable ties can be used for attachment.

3 If you wish to use a pipe pressure fuel system, we stock the MACS brand thin wall pressure fittings. These are a captive system, with a flange inside the pipe and a threaded nut on the outside. Alternatively, a large bore pressure nipple in the alloy header (for Quiet pipes) is also OK. Most users prefer to place the pressure fitting at or about the maximum diameter of the pipe, however extensive testing has proved it makes little difference where the pressure fitting is situated. For ducted fan use we prefer fan pressure, and for pylon racing we prefer pipe pressure taken from the max pipe diameter unless exhaust timing is below 170^o, were we use crankcase pressure.

4. The first ground run and test flight should be done with the models cowl / belly pan removed for extra cooling.

5. When cowled, as in a pylon racer, cooling air MUST be provided, especially for the first 1/3 of the pipe length.

6. For cowled racing models it is ESSENTIAL that cooling air be directly directed into this area.

7. The air exit to any cowl needs to be least double (or treble) the inlet area.

8. Occasionally the pipe should be removed from the model and be allowed to drain ... front end down. If it is to be unused for any time, wash out with thinners or methanol..... shake and blow through to dry before storage.

9. A Well Cooled Pipe is worth it for gains in power and reliability.

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