Click to enlarge

Model design by
M.D. Baclawski 
mbaclawski@lgcy.com

AF99 work by 
Jim Youngken
rogue1@rogueair.com

Textures by
Germán Erostarbe
erostg@hotmail.com

Installation

FS98: Unzip "340prima.zip" in a temporary directory.
Place "340prima" folder and it's contents into your FS98/aircraft folder.
 
 

Features

Moving parts, Nav Lights, Strobes, Landing Lights,
           Night Lighting, Position Lts, Spoilers and Flaps.
 

The 340 began life as the SF340, a joint venture between Saab-Scania and Fairchild, in the early 1980's with the first production models going into service in 1984. In November that year Saab took over full responsibility for the aircraft following Fairchilds decision to move out of aircraft production, the SF340 designation remained for a time but was eventually changed to 340A. The 340B offers more powerful engines to improve the 'hot and high' performance, an increase in the maximum takeoff weight and improved range, it was delivered in September 1989.
 

Power 2 x 1750shp General Electric CT7-9B turboprops
Cruise speed
   Maximum   285kts TAS
   Long range     252kts TAS
Range 805nm (max cruise with full load and reserves)
    935nm (econ cruise with full load and reserves)
Service Ceiling   FL250
Max takeoff wgt   28,500lbs
Max Speed         Mach 0.50
Stall Speeds 110kts (clean) 85kts (full flaps)

Flying the Saab340B

Notes:
The airspeeds given are indicated airspeeds (IAS) so you will need to select this option in the 'options', 'preferences', 'instruments' menu. Takeoff and climb data is for the aircraft at maximum takeoff weight. The throttle settings are given as n2 readings, this corresponds to the 'turb' meter on the learjet panel.

The flight model was designed using a more realistic temperature gradient than the default weather provided by fs. The Outside Air Temperature (OAT) should decrease by 3.5 Farenheit (2 Celsius) for every 1000' of increased altitude. So if the temperature at sea level is 59F the OAT at 40,000' should be -81F not +14F as the program defaults to. Flying with the default temperatures will cause a marked decrease in the aircrafts performance and range.

The aircraft has been test flown after conversion to fs95 and flies as per the numbers below.

Take off:
Apply 1 notches of flap. Open the throttle to 95% n2 and rotate at 115kts. Gear up on positive climb and aim for the initial climb to be at 130kts. As the speed approaches 140kts remove the flap.

Climb:
Maintain the throttle at 95% n2 for the climb. Trim the aircraft to climb at 170kts IAS, initially this will give a climb rate of 2000fpm and if you get the trim right the aircraft will hold 170kts and slowly reduce the rate of climb without any further pilot intervention.

Cruise:
The service ceiling is FL250 however as the aircraft is used on short haul commuter routes it will normally cruise under FL200. Level off and reduce the throttle to 90% n2 for the maximum cruise speed of 285kts TAS or 87% n2 for economical cruise speed of 252kts TAS. The IAS value will depend on your altitude.

Descent:
Throttle back to 65% n2 and lower the nose to start the descent. If you set the autopilot altitude to the desired altitude and put the 'altitude hold' on you will descend at 1750fpm at just over 200kts IAS.

Holding/Approach Pattern:
Increase the throttle to 78% n2 to hold the airspeed at 180kts IAS.

Landing:
Maintain the throttle at 78% n2 and add 1 notch of flap to reduce the airspeed and start the final descent. Gradually add more flap and lower the gear, with full flaps and gear down adjust the throttle to cross the runway threshold at between 120kts.
 

Flight Sim data

The following data was collected during my test flights. You may find it useful for programs such as Navigator and adventure creators which want climb and descent rates with true airspeeds and fuel flow figures.

Taxiing
 Fuel burn    8 gals

Climb to 19,000'
 Average climb 1520 fpm
 Average speed  194 kts TAS
 Fuel burn  233 gal/hour

Cruise at 87% n2 (252kts TAS)
 Fuel burn  113 gals/hour

Cruise at 89% n2 (285kts TAS)
 Fuel burn  131 gals/hour

Descent (using a/p alt hold)
 Average descent 1755 fpm
 Average speed  248 kts TAS
 Fuel burn   58 gals/hour

Holding
 Fuel burn   91 gals/hour

Fuel Capacity  500 gals
Reserves    5%

Review October 2000 by Marco Berruti - Fire Systems
www.firesys.homestead.com

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