Ultralight Aircraft Parts

Propeller Recommendations

Competition Aircraft: Composite Propellers for Ultralight Aircraft Since 1983

Recommended Ultra-Prop Combinations


Generic Engine HP Reduction Prop Diameter* Pitch**
R503 DC 52 2.58:1 104 59" 15 or 16
R503 SC 48 2.58:1 104 59" 14 or 15
(best) R447 40 2.58:1 104 59" 13 or 14
R477 40 2.58:1 103 59" 16
(best) R377 35 2.58:1 103 59" 13 or 14
R377 35 2.58:1 104 59" 11
R277 28 2.58:1 103 59" 10 or 11


Airboats Engine HP Reduction Prop Diameter Pitch
Honda/B&S 13 direct drive 103 36" 13
Honda/B&S 20 direct drive 103 42" 15 or 16
Honda/B&S 20 direct drive 104 42" 14


Generic Engine HP Reduction*** Prop Diameter Pitch
Hirth F33 28 2.5:1 103 59" 10 or 11
Hirth F33 28 2.5:1 103 52" 17 or 18
Hirth F33 28 2.5:1 102 59" 13 or 14
Hirth F33 28 2.5:1 102 55" 17 or 18
MZ 34 27-32 2.34:1 103 57" 10 or 11
MZ 34 27-32 2.34:1 103 52" 15 or 16
MZ 34 27-32 2.34:1 103 49" 17 or 18
MZ 34 27-32 2.34:1 102 59" 10 or 11
MZ 34 27-32 2.34:1 102 57" 13 or 14
MZ 34 27-32 2.34:1 102 52" 17 or 18


Aircraft Engine HP Reduction Prop Diameter Pitch
CCS Hawk Cuyuna 430
Cuyuna UL II-02
KAW. 440
30
35
35
2.4:1 103P 59" 14 deg cruise or 13 deg climb
Eipper MX II Rotax 503 48 2:1 103P 52" 15 degrees
Eipper MX I Cuyuna 430
Rotax 377
30 2:1 103P 52" 12 or 13 deg.
Eippper GT Rotax 477 38 2.58:1 gear 104T or
103T
59"

59"
13 deg. or 14 deg.
15 deg.or 16 deg.
Wizard T-38B Rotax 503
Rotax 377
48
36
2.2:1 103P
103P
59"
59"
14 deg.
12 deg.
Condor II Kaw. 440 38
-
103P 56" 16 deg.
Eagle XL Cuyuna 430
Cuyuna UL II-02
30 2.4:1 103P 59" 14 deg.
Falcon Rotax 277 28 2.4:1
2.58:1 gear
103P
103T
54"
55"
13 deg.
15 deg.
Teratorn TA
Tierra, single

Tierra, two-pl.
Rotax 277
Rotax 377
Rotax 277
Rotax 503
Rotax 477
26
35
28
48
38
2.58:1 gear
2.2:1
2.58:1 gear
103P
103P
103T
103P
104T
59"
59"
59"
59"
59"
13 deg.
12 deg.
10 deg.
14 deg.
13 deg.
Aerodyne Vector Rotax 377 35
-
103P 53" 12 deg.
Fledge Foxbat Cuyuna 430 30 2:1 103P 53" 13 deg.
Kolb Ultrastar Cuyuna UL II-02
Rotax 377
35 2:1 103P 50" 16 deg.
Star Flight TX 1000 Rotax 377
Rotax 377
35
35
2:1 103P or
104P
103P
59

59"
54"
16 deg.

14 deg.
12 deg.
Buccaneer Rotax 277

Rotax 277
Rotax 447
28

28
38
3.078:1 planetary
2.58:1 gear
2.58:1 gear
104P

103T
104T
59"

59"
59"
16 deg.

11 deg.
14 deg.
Pioneer Flt Star Kaw. 440 38 2.1:1 103T 54"
58"
12 deg.
10 deg.
Cobra Cuyuna 430 30 2:1 planetary 103T 54" 12 deg.
FP 101 Kaw. 440 35 2.4:1 103T 56" 13 deg. or 14 deg.
Phantom Kaw. 440A 37 1.96:1 103T 57" 12 deg.
Mono Fly Rotax 503 54 2.5:1 103P 59" 16 deg.
Quad City Challenger KFM 107 ER
Rotax 503
25
48
2.1:1
2.2:1
103P
103P
52"
54":
11 deg.
15 deg.
Birdman
Chinook
Rotax 503
Rotax 277
48
28
2.18:1
2.5:1
103P
103P
58"
54"
13 deg.
14 deg.
Maxair Sports Hummer

Drifter DK440
Drifter XP
Rotax 277
Rotax 277
Kaw. 440
Rotax 503
Rotax 532
28
28
38
48
60
2.25:1
2.58:1 gear
2.25:1
2.25:1
2.23:1 gear
103P
103T
103P
103P
104T
56"
56"
59"
59"
59"
10 deg.
14 deg.
13 deg.
14 deg.
12 deg.
Rotec Rally 2B
Rally 3
Rally Sport
Rotax 377
Rotax 503
Rotax 503
35
48
48
2.25:1
2.25:1
2.25:1
103P
103P
103P
54"
59"
59"
13 deg.
13 deg.
13 deg.
Air Command
Gyrocopter
Rotax 447
Rotax 503
38
48
2.58:1 gear
2.58:1 gear
104T
104T
59"
59"
13 deg.
14 deg.
Spectrum Beaver Rotax 277
Rotax 447
28
38
2.58:1 gear
2.58:1 gear
103T
104 T
59"
59"
11 deg.
13 deg.
Cascade
Kasperwing
Rotax 503 48
-
104P 59" 10 deg.
Pterodactyl Cuyuna 430 30 2:1 103P 55" 10 deg.
Jetwing Trike Kaw. 440 38 2:1 103P 54" 12 deg.
Sorrell
Hyperlight
Rotax 277 28 2.5:1 103T 59" 11 deg. or 12 deg.


*Increase pitch by one degree for every one inch decrease in diameter.
**A change in pitch of one degree is worth about 200-300 change in engine RPM. Increasing pitch will decrease RPM. Decreasing pitch will increase RPM.
***Other lower reduction ratios are available. Contact Competition Aircraft for help in propeller selection.