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Here some documents showing a test between a fixed pitch propeller and an aeromatic on a Stinson 108-2.
For better reading, I repeated the performance table below.


Stinson Model 108-2

Performance Comparison Summary

 

Aeromatic: Model F-200 Blade 00-76B

Fixed Pitch: Model 76 JR-53                   

 

 

Maximum Speed

 

Fixed-Pitch

 

Aeromatic

 

 

Pressure Altitude

I.A.S

RPM

HP

 

I.A.S

RPM

HP

 

Improvement in Airspeed

1000

128

2800

149

 

136

2800

160

(FT)

6.2%

 

132

2880

162

(FT)

 

 

 

 

 

3000

126

2800

140

 

132

2650

143

(FT)

4.7%

 

127

2860

150

(FT)

 

 

 

 

 

5000

121

2800

139

(FT)

123

2610

132

(FT)

1.6%

Note: FT indicates Full Throttle

 

 

 

 

Cruising Performance at 2600 RPM

 

Fixed-Pitch

 

Aeromatic

 

 

Pressure Altitude

I.A.S

RPM

HP

 

I.A.S

RPM

HP

 

Improvement in Airspeed

1000

120

2600

119

 

127

2600

128

 

5.7%

3000

115

2600

113

 

125

2600

135

 

8.6%

5000

112

2600

111

 

122

2600

131

 

8.8%

 

 

 

Climbing Performance 2230 lbs. Gross Weight

 

Fixed-Pitch

 

Aeromatic

 

 

Pressure Altitude

R/C

RPM

HP

 

R/C

RPM

HP

 

Rate of Climb

Improvement

Sea Level

710

2425

141

 

915

2770

164

 

28.8%

1000

680

2425

138

 

860

2745

158

 

26.2%

3000

620

2425

129

 

760

2705

146

 

22.5%

5000

530

2425

116

 

610

2640

131

 

15.0%


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