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Cozy MKIV - Seventh Flight Test Protocol

Seventh Flight Plan - Gear Retraction Test:

GPS: Set to FIT area - 12 mile range
Radio: Fitchburg traffic, Experimental N83M(ike)Z(ulu) departing runway 32 to the west - Fitchburg.
Throttle: Full - Check for 2300 - 2400 RPM static
Accellerate: To 75 - 80 mph and rotate
Climb: 100 mph straight out to 1000 ft.
Check: CHT / Oil Pressure
Climb: Climb checklist - 100 mph gentle turn to west area to 4500 ft.
Level: 4500 ft.
Throttle: 2000 RPM or to 120 mph
Radio: Fitchburg traffic, Experimental N83M(ike)Z(ulu) maneuvering at 4500 ft. 3 miles west Fitchburg

 

Throttle: Set for 170 mph indicated
Track: Use GPS - set up constant track of 270 deg. at 170 mph indicated
Note: GPS Groundspeed - 186 mph
Track: Use GPS - set up constant track of 180 deg. at 170 mph indicated
Note: GPS Groundspeed - 189 mph
Track: Use GPS - set up constant track of 090 deg. at 170 mph indicated
Note: GPS Groundspeed - 188 mph

 

Throttle: Set for 150 mph indicated
Track: Use GPS - set up constant track of 270 deg. at 150 mph indicated
Note: GPS Groundspeed - 160 mph
Track: Use GPS - set up constant track of 000 deg. at 150 mph indicated
Note: GPS Groundspeed - 154 mph
Track: Use GPS - set up constant track of 090 deg. at 150 mph indicated
Note: GPS Groundspeed - 167 mph

 

Throttle: Set for 130 mph indicated
Track: Use GPS - set up constant track of 270 deg. at 130 mph indicated
Note: GPS Groundspeed - 138 mph
Track: Use GPS - set up constant track of 000 deg. at 130 mph indicated
Note: GPS Groundspeed - 136 mph
Track: Use GPS - set up constant track of 090 deg. at 130 mph indicated
Note: GPS Groundspeed - 146 mph

 

Throttle: Set for 110 mph indicated
Track: Use GPS - set up constant track of 270 deg. at 110 mph indicated
Note: GPS Groundspeed - 117 mph
Track: Use GPS - set up constant track of 180 deg. at 110 mph indicated
Note: GPS Groundspeed - 130 mph
Track: Use GPS - set up constant track of 090 deg. at 110 mph indicated
Note: GPS Groundspeed - 124 mph

 

Throttle: Set for 90 mph indicated
Track: Use GPS - set up constant track of 270 deg. at 90 mph indicated
Note: GPS Groundspeed - 96 mph
Track: Use GPS - set up constant track of 180 deg. at 90 mph indicated
Note: GPS Groundspeed - 109 mph
Track: Use GPS - set up constant track of 090 deg. at 90 mph indicated
Note: GPS Groundspeed - 103 mph

 

Throttle: Set for 70 mph indicated
Track: Use GPS - set up constant track of 270 deg. at 70 mph indicated
Note: GPS Groundspeed - 77 mph
Track: Use GPS - set up constant track of 000 deg. at 70 mph indicated
Note: GPS Groundspeed - 74 mph
Track: Use GPS - set up constant track of 090 deg. at 70 mph indicated
Note: GPS Groundspeed - 84 mph

 

GPS Groundspeeds Measured (mph)

True Airspeed

CalibratedVc
Target AS V1 V2 V3 mph knots knots mph
170 185 189 188 187 162 150 172
150 160 154 167 164 142 132 151
130 138 136 146 142 124 114 131
110 117 130 124 121 105 97 112
90 96 109 103 100 87 80 92
70 77 74 84 81 70 65 75

In the table above, the first column and the last column are the ones of interest, showing the target airspeed and the calibrated airspeed, with the difference being the error of the airspeed indicator.  Not too bad - at anything over 90  mph, the error is within 2 mph.

Vc vs. Vo

 

Throttle: 1400 RPM - descend to pattern altitude
Approach: Use landing checklist - maintain 100 mph downwind / base, 90 mph final, extend landing brake on final, touch down 75 - 80 mph.

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