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Pneumatic Control Unit-PCU

The JMP Pneumatic Control Unit is designed to control the brakes, retract gear cylinders and landing gear door cylinders of the most complex r/c model aircraft. The goal of the PCU is to eliminate the complexity and disorganized nature of model pneumatic systems. Most installations have many t-fittings which cause unavoidable pressure drops across the entire system. This is eliminated with the PCU. Also included with the PCU are individual servo linkages and quality 1” readable pressure gauges for each of the three air circuits. The overall size of the completed PCU is 5.5” in length and 3.5” in width. From the top face of the gauges to the bottom edge of the brake servo it is 2.0” tall.  

Either standard 1/8” OD or 4mm fittings can be ordered. Large models with increasing air cylinder diameters often now use 4mm size air lines. When ordering, let us know the number of retract gear cylinders and gear door cylinders and the proper fittings will be installed. Additional unused ports on the PCU lower side manifold are plugged, but can be changed later for some other model with different cylinder counts. Many combinations of fittings and control possibilities can be imagined.

The PCU can use three individual air supplies which will divide the retract gear, gear doors and main wheel brakes into separate air circuits. A manifold air fitting point for the JMP Failsafe Sequencer is also provided. This Sequencer senses a low air supply in the retract gear air circuit and shifts the retract gear and gear doors to the down position. Robust servos control the High Flow 2-Way Valves and proportional Brake Control Valve.  Precision 1-Way Fill Valves are mounted to the PCU and feature a very neat and quick Tapered Filling Adapter. Also available is a more standard 1-Way Valve with a screw in fill fitting.

Single point control units have been available for some time. Their miniature control valves are fragile and unreliable. These valves are controlled by very weak actuators. Difficult and painful programming is found on nearly every one of these units. They are also produced offshore with no real way to deal with manufacturing and programming problems. Multiple manifold type air line attach points are not found on these digital type units. The “Old School” nature of the PCU makes it easy to use and deals directly with air line and plumbing challenges found in easy to complex models.

PCU 549.00

2-Way Valve 59.95

The new JMP 2-Way valve is the finest and most robust servo controlled valve built for RC models. The spool design uses quad seals with definite end stops. Its vertical design allows the air lines to remain hidden. It is truly a high flow valve and may be ordered with hose barbs for 1/16" i.d. air line or 4mm air line.

The new JMP 1-Way Fill Valve is a precision machined check valve. It uses a checking concept found in expensive demanding aerospace equipment. Mounts to the model's control board using a washer and nut. The JMP Tapered Fill Adaptor provides easy connect and disconnect to the air supply. Available with hose barbs for 1/16" i.d. air line or 4mm air line.

NEW  JMP 1-Way Fill Valve 39.00

Tapered Fill Adaptor

20.00

A simple but effective way to couple your air pump to the 1-Way Fill Valve. Just push the tapered nylon fitting into the valve to create a temporary seal. The air line automatically recoils, stays neat and out of the way.

NEW JMP Air Trap

AVAILABLE SOON

The JMP Air Trap uses a proprietary fiber membrane to filter fuel to 10 microns and virtually eliminate air from entering the final fuel pump suction line. Smoke systems are also improved with use of the Air Trap. This design is extremely robust with properly designed end caps that deal with positive and negative pressures often found during fast fuel filling and draining. Either the vertical or horizontal versions have CNC machined mounting tabs with Laser printed front caps pointing out the correct fuel tube attach points. The JMP Air Trap comes completely assembled, leak checked and ready for installation.

The Air Trap has positions for two “Fuel In” hose barb fittings that can be used for twin main fuel tanks. One of these “Fuel In” fittings can be blocked if there is a single main fuel tank requiring only one fuel inlet fitting.  A center hose barb fitting attaches to the fuel filter membrane. This is the “Fuel Out” position which delivers fuel to the turbine fuel pump.  Also, a drain/fill line is provided.

Hose Barb Fittings: The JMP Air Trap is available with hose barbs to fit either 1/8” i.d. or 3/16” i.d. tubing sizes. Many combinations of the two are also possible.  

Construction: The Air Trap is constructed from aircraft grade aluminum and the finest West Systems Epoxy with a main body that is translucent. It is easy to visually check for system air leaks and overall fuel system performance.

Proper Filling: The fitting with the smaller hole is for the fueling/de-fueling line. Do not allow any air to enter this line when removing the fill line from the fueling station. Fold this fill line over in your hand when the tanks are full and install the plug. Very little air should show in the Air Trap when the fuel tanks are completely full.

Proper Operation: Typical clunk style fuel systems found in model jets do not deliver fuel perfectly, especially when the model fuel tanks are near empty. Some air is normal to see in the Air Trap. An amount of air that would leave the Air Trap half full is not good. Either the main fuel tanks were run very low or there may be a leak upstream in the fuel system. This should be checked out.

Proper Orientation: The vertical design Air Traps are normally mounted straight up and bolted to the model control board. The horizontal design Air Traps are normally mounted with the mounting tabs bolted down to the model control board. On the horizontal design, this keeps the “Fuel In” fitting to the top. If you decide to mount the horizontal design Air Trap upside down to the bottom of the model control board, you must reverse the “Fuel In” fitting and the “Drain/Fill” hose barb fittings. Drain/Fill must always happen from the lower side of the Air Trap. Just remember that air in the system must be forced up and out during the filling cycle leaving the Air Trap completely full of fuel.

 Available in 4 sizes and 2 mounting options!

         Please specify when ordering:

___Small Horizontal Mount-1.5”x 3.25”-2.9 ozs.

___Small Vertical Mount-1.5” x 3.25”-2.9 ozs.

___Medium Horizontal Mount-1.75” x 3.75”-4.66 ozs.

___Medium Vertical Mount-1.75” x 3.75”-4.66 ozs.

___Large Horizontal Mount-2.25”x 4”-8.8 ozs.

___Large Vertical Mount-2.25”x 4”-8.8 ozs.

___Extra Large Horizontal Mount-3”x 5”-19.5 ozs.

__Extra Large Vertical Mount-3”x 5”-19.5 ozs.

      Choose one option for each line:

 1. Number of “Fuel In” hose fittings 1___or 2___

2. Size of “Fuel In” hose fittings 1/8”___or 3/16”___

3. Size of “Fuel Out to Pump” hose fittings 1/8”___or 3/16”___

4. Size of “Fuel/De-Fuel” hose fitting and fuel line plug 1/8”___ or 3/16”___

Large Fuel Tank Fittings

These large fuel fittings are designed to minimize tank and pump pressures during fueling-defueling and running of the turbine. For 3/16" I.D. Tygon fuel tubing.

42.00 / Set

Machined arms and mounts are available for the HiTec 5755 metal gear servo. These parts are designed for heavy-duty applications requiring power and holding strength. The servos are somewhat larger than standard sizes and feature an extremely large and tough gear set.

          MACHINED SERVO ARM....... 75.00   0-FLEX MOUNTS......25.00 

This new twin vent overflow tank is designed for models with one or two fuel vents. The extra-large fuel fittings and tubing help to lower the pressure caused by fueling at a high rate.  

TWIN VENT OVERFLOW TANK 50.00

JMP’s HUSTLER 100 oz. CENTER FUEL/SMOKE TANK

This custom fiberglass tank will deliver either turbine engine fuel or smoke fuel engine. A JMP Accumulator is embedded into the tank to save valuable fuselage space and deliver a bubble free fuel supply to the engine or smoke pump. The center baffle controls rapid fuel weight shift. A machined aluminum truss provides for easy mounting in the Hustler airframe or other similar model designs. This JMP fuel tank comes fully assembled and leak tested for the perfect fuel delivery system.

SMOKE TANK     250.00