DYNAMAX  DUCTED FAN UNIT

The Dynamax ducted fan propulsion system was designed by leading General Electric aerodynamicists and Tom Cook of Jet Model Products.  Precision machined parts, the finest carbon fiber plastics and advanced injection molding techniques have made the Dynamax Fan an industry standard.  Years of proven performance makes this the obvious choice for ducted fan modelers and is recommended as required equipment by model jet manufacturers around the world.

Engine speeds of 21,000 to 23,000 r.p.m. will deliver upwards of 15 lb. of static thrust with properly designed flow paths.  Many models in the 20 lb. weight range have been successfully flown with the Dynamax Fan.  When correctly assembled and installed, the modeler can expect years of enjoyment and exciting performance. 

Assembled and balanced versions are the only Dynamax fans available.  They require only the
 installation of the engine, rotor blade and spinner.  Click on the “Accessories Button” for additional
 system support items.

Assembled Dynamax Fan Unit /OS Assembled Only  230.00

Parts Replacement List

The OS .91 VR-DF is a high performance engine designed expressly for ducted fan model aircraft. For maximum performance and longevity, these engines incorporate a specially developed ABC type piston and cylinder. Construction of the rear drum valve is molybdenum steel. The carburetor is the OS type 9B which provides exceptional throttle response.

Fully computerized modern precision machinery and selected top quality materials are employed in the manufacture of these engines to insure consistent high performance and long life.

When teamed with the JMP Dynamax Ducted Fan Unit and other supporting parts, you can be assured of maximum performance and reliability at a reasonable cost.

Please contact Tower Hobbies if you need to purchase an OS .91 Engine

SYSTEM II  TUNED PIPES 

Tuned Pipe Page & Price List

JMP’s System II tuned exhaust pipes represent the cutting edge in ducted fan
 technology. Pre-tuned to the OS .91 engine, single piece construction, machined header,
 and high temp heat seal make this system the most advanced in the hobby today. When
 properly installed and used as recommended, the heat seal can last through an entire
 flying season.  A variety of angled headers are available for use in nearly any application.

DYNAMAX STARTER PROBE    $45.00

Simple, affordable, and durable tool for starting ducted fan aircraft. Replaceable end
 blade makes field repairs easy and quick.

This item is currently out of stock.

DYNAMAX ROTOR WRENCH    $15.00

JMP’s rotor wrench is manufactured exclusively for use with the Dynamax ducted fan unit.
Its purpose is to hold the rotor securely while tightening down the front end hardware. This
voids the need to place excessive pressure on the individual rotor blades and stator vanes.

PRESSURE VENT   $20.00

The pressure vent is designed to supply pressure to the fuel system by using air velocity from the spinning fan rotor, rather than tuned pipe pressure. The results are a more linear pressure rise and the venting of excess fuel into the airflow instead of the tuned pipe.

“IN-FLIGHT” MIXTURE CONTROL   $40.00

More commonly called the “remote needle valve”, allows for on the fly carburetor adjustments. Just set it, lock it down, and forget it. Double sealed steel needle and steel seat guarantee long-life and steady operation. Possible engine displacements are .25 to 4.0.
  
 NOTE: This application requires a separate servo and additional channel.