Control Quadrant Upgrade
Available for CIRRUS SR20, SR22
Tamarack Aerospace Group’s Control Quadrant Upgrade results in greater fuel efficiency with reduced engine wear by means of a propeller RPM control lever. The Prop control lever for CIRRUS SR20 and CIRRUS SR22 reduces noise significantly while providing a much more relaxing and enjoyable flight for both pilot and passengers.
Benefits
- Simple non-structural installation
- Traditional propeller RPM control, enabling “oversquare” operations as in other high performance aircraft (Columbia/Corvalis, Mooney, Piper, Cessna, Beech, etc.)
- Reduced fuel consumption, 1+ gallon per hour in cruise and 5+ gallons per hour in a cruise-climb
- Pays for itself in approximately 200 hours of operation
- Dramatically reduced cabin noise and vibration
- Airport/environmentally friendly noise abatement
- Reduced engine wear and operational costs
- Boost pump LED to remind pilots
- Easy installation and easy return to OEM status
- Compatible with the CIRRUS SR20 or SR22
Control Quadrant Upgrade – Flight Test Results (Rich of Peak) This “Butterfly Chart” compares the fuel flow and manifold air pressures (MAPs) at three different airspeeds. Red lines represent constant engine RPM, and blue lines represent constant indicated airspeed. In the example, at 2,300 RPM and 135 KIAS, the fuel flow is 13.2 gallons per hour (GPH) and MAP is 21 in. When indicated airspeed is held constant and RPM is decreased, the fuel flow also decreases in all three instances shown on this chart. The fuel flow at faster airspeeds drops more steeply, representing greater fuel savings.
Control Quadrant Upgrade Fuel Savings (Rich of Peak) – 135 KIAS Note the fuel savings when engine RPM is decreased from 2,500 RPM. When operating at lower RPM, significantly less fuel is consumed. At a constant
135 KIAS, the fuel savings is about 7% when the engine RPM is reduced from 2,500 RPM to 2,250 RPM.
Control Quadrant Upgrade Efficiency (Lean of Peak) – 6,000 feet The aircraft’s performance at different RPMs compared to 2,500 RPM at 6,000 feet altitude and 50°F Lean of Peak is illustrated here. As the RPM is decreased, fuel efficiency is improved (% Fuel Savings and NM/gal) and the airspeed decreases slightly (% KTAS). For example: At 2,000 RPM, there is nearly a 20% increase in fuel savings, an 18% increase in fuel efficiency (nm/gal) with only a 10% decrease in true airspeed. Therefore, at 2,000 RPM, the aircraft is flying more slowly but more efficiently. Compare this to the SR22 Pilots Operating Handbook’s example of: ISA conditions, 6,000 feet pressure altitude, 2,500 RPM and MAP of 23.5 in, the fuel flow is 14.1 GPH at 59% power and an airspeed of 162 KTAS.
~ Limitations & Conditions ~
The installation should not be incorporated in any aircraft unless it is determined that the interrelationship between this installation and any previously approved configuration will not introduce any adverse effect upon the airworthiness of that aircraft. The approval of this modification applies to Cirrus Design SR20/22 airplane models delineated below.
- This STC is applicable to the following serial blocks of the Cirrus Design Aircraft:
- Cirrus SR20: Serial Numbers 1005 through 1885
- Cirrus SR22 Serial Numbers 0002 and subsequent without Garmin Perspective Avionics installation
- SR20 airplanes equipped with Hartzell BHC-J2YF-1BF/F7694 propeller assemblies must have a placard installed reading “Avoid operation between 1900 and 2200 RPM above 24” manifold pressure.