The smoke system is extremely simple. It uses the pressure inside the turbine to force smoke fuel from a separate tank (or tanks) to a nozzle behind the exhaust outlet of the turbine. The heat from the turbine vapourises the smoke fuel and makes the smoke. 

A normal servo, on a spare channel controlled by a 2-position switch on your transmitter, simply opens/closes a Festo valve to spray the smoke fluid behind the exhaust of the engine. No extra nicads or pumps are needed !

The drawing and photographs of the system should make everything clear. If you have any questions, please email us for assistance.

For those customers with recent AMT NL motors you will find an M5 s/s grub-screw instead of the normal M2 bolt in the front plate (under the Front cap) near the air inlet. It is loctited into place, but can be removed with a 2.5mm hexagon wrench. 

Simply replace this M5 screw with a standard M5 threaded Festo nipple, as shown in the photos. 
Mark the position of the hole on the Front cap, with
a centrepunch, and drill a hole of about 6mm diameter. 
Fit a rubber grommet in the hole for the pp3 tube to pass through so it does not get damaged.

Older motors can be modified by us to have this
pressure nipple fitted, but only when they are at our offices for other servicing or repairs.

Smoke Fuel and Tanks

For the smoke fuel you can use normal diesel, but better is bio-diesel (at the moment only available in Germany) as this gives about 20% extra smoke.

On our demonstration models (powered by Mercury HP turbines) we have found that a flow of about 0.75 litre in 1 minute makes very good smoke in the air, and this amount is enough for about 4 or 5 flying manoeuvres. For a Pegasus or Olympus you should aim for about 1 litre per minute.

Note: Be careful to only use strong fuel tanks for the smoke fuel as the pressure produced at full throttle from in our motors is approx. as follows: 

Mercury HP  2.8 bar    Aprox.  ( 40 psi )
Pegasus HP 3.2 bar     Aprox.  ( 45 psi )
Olympus  4.0 bar         Aprox.  ( 58 psi )

The stainless-steel tube needed for the smoke nozzle, the Festo nipples and valves, and the pp3 tube are available from AMT Netherlands.

The smoke nozzle is made from stainless-steel tube with an inside diameter of 3mm. 

Drill out the inside diameter of an M5 festo nipple to 3mm, and silver-solder the nipple to the end of the s/s tube for connecting the pp3 tube. 

To prevent any vibration of the smoke-nozzle tube it is necessary to make it more stiff/rigid by silver-soldering a piece of brass or s/s to the bottom of it as shown in the photos. 

Connect the smoke nozzle to the FESTO valve on the outgoing line of the smoke fuel tanks with Festo pp3 tube.

To control the smoke system, and switch it on and off during flight, you can use a standard servo a FESTO valve (pp3 size). 

The pressure from the motor connected by the FESTO one way valve (HQS4) will continously pressurise the smoke tank. The FESTO valve QH-QS-4 opens the outlet from the tank to the smoke nozzle. 
 
 

Circuit diagram of installation as a PDF.
 

If you do not have a Acrobat reader you can dowload the reader for free at the ADOBE site. 

We strongly recommend that, when you have finished flying for the day, you release any pressure remaining in the smoke tank(s) to prevent damage to the tanks during storage.