Quasiturbine> Product> Pneum. Chainsaw


Pneumatic is used everywhere: It is safe, needs little maintenance, last long...

Quasiturbine Pneumatic Chainsaw
Efficient Low rpm High Torque QT.6LSC air motor

This product will be available
only when homologated for security and environment.

It is the buyer and/or operator responsibility  to comply with all applicable national
and local laws and rules,  including those on security and pressurized products.

Sales (when homologated for security and environment.)
for ? euro (or US$ in America NAFTA).

Product Description

At only 2 bar (30 psi). Power goes up with pressure...

This chainsaw is shown only as a sample of 1.5 kW QT engine application.
The chainsaw is not available for sale at this time.

The Quasiturbine chainsaw has been developed to an advance stage. Casing and rotor weight have not yet been optimized (cylindrical outside measurement are about 7 7/8" in diameter and 2 1/2" in thickness excluding peripherals). It has a total 600 cc intake volume per revolution. The QT.6LSC has been extensively developed and tested.

Quasiturbine QT.6LSC Pneumatic Chainsaw
Usable with intake sustained pressure as low as 20 to 50 psi!
Several HP on a 60 psi air line.

The rotor and the cylindrical external casing are built of high metal (no aluminum at this time). Comprise a cylindrical stator bloc, a rotor and an 3/4-inch diameter shaft throughout. 2 intake ports 1/2" male NPT pipe threads and 2 exhaust ports 1/2" male NPT pipe threads. Maximum peak: 60 psi. Periodic lubrication required. Ideal for mining industries and other environment sensitive applications.

Quasiturbine QT.6LSC Pneumatic
shown without the differential and the central shaft.
A volume of 75 cc per chamber and the swept volume is 8 chambers per revolution
(4 on the top, 4 on the bottom) which totalized 600 cc per revolution.
At 500 RPM, this is a volumetric flow of 0,3 cubic meter per minute at intake!

Steam - Hydraulic Notice

This is a pneumatic Chainsaw which could be made available in Steam Quasiturbine option. For this reason, the pneumatic unit must be running cold, and no steam operation should be attempted. Steam and pneumatic version must not be used with incompressible fluid (liquid hydraulic mode) without having been first modified to deal with seals hydraulic lock.

Typical Characteristics

Typical value given as indication only. May vary from one QT to another.
In the present state of development, one needs to typically apply 10-15 psi
at the intake pressure gauge to obtain a free rotation at 500 RPM.
To produce 1 HP at 500 RPM (not the maximum power),
one needs to apply about 40 psi at the intake pressure gauge.
The "effective differential internal pressure" is then about 25 psi,
producing a torque of 120 pound-inch.

 Approxamative torque curve
Model QT.6LSC Pneumatic
(Rotor average diam. 6 in. by 2 in. thickness)
The values vary linearly around this low pressure point
but must not be inconsiderably extrapolated to high pressures
(Near 1 HP by 25 psi effective, at 500 RPM).

Remark on Pneumatic Efficiency

An high efficiency pneumatic motor does not guaranty the high efficiency of the entire pneumatic system. All gas heat up during compression and cool down during relaxation. The cooling effect must not be under-estimate. As an example, a typical 200 bar (atm.) cylinder empty adiabatically (without thermalization to ambient temperature) gives at the end an air so cold that its volume is then a 1/4 of that of the air once back to the ambient temperature (isothermal relaxation). In those temperature conditions at the entrance of a pneumatic motor, the efficiency is catastrophically low and the lubricant solidified, which increases considerably the internal engine friction... Generally, the reversibility of the "compression - relaxation" cycle reduces with an increase in pressure, which favors for high efficiency consideration the use of the lowest design pressure possible. The measurement of the exhaust temperature gives generally a good indication of the efficiency, since the minimum of energy lost into the environment correspond to an exhaust temperature equal (neither inferior, nor superior) to the ambient temperature. This condition can be achieve by a slight heating (solar) of the gas before its entry into the pneumatic motor. Since the Quasiturbine rotates from pressure as low as 1/10 of atmosphere (bar) (one psi !), one understand why the Quasiturbine is so well adapted to high efficiency system... For higher pressure drop (not suitable with the prototype), an intake air heating coil in hot water would be necessary to prevent freezing of the oil within the Quasiturbine.

Safety Precautions

  • It is the buyer and/or operator responsibility  to comply with all applicable national and local laws and rules,  including those on security and pressurized products.

  • These prototype must be use under the constant supervision of qualified professional.

  • Never exceed the limits and suggested conditions of operation.

  • Wearing safety glasses, mask and fastened hair is recommended.

  • The demonstration room must be well ventilated.

  • Check the tightening of the bolts and adapters.

  • Be aware of the rupture or the decoupling of any of the flexible hoses.

  • Have a distant valve at hand to cut the air/nitrogen flow as needed.

  • Always remain vigilant and careful!


Manufacturer under a privileged QT-Rotors supply license agreement
Casier/Code/Porte 2804, 3535 Ave Papineau, Montréal Québec H2K 4J9 CANADA
(514) 527-8484      Fax (514) 527-8484
Associated website www.quasiturbine.com   info@quasiturbine.com

Subject to changes without notice - December 17, 2004