The proven blade design of the G-SONIC propellers has been known for their high resistance that has led to an increase in torsional strength, bending strength and tensile strength. Newer manufacturing processes has made the G-SONIC propeller series even more efficient generating more thrust at reduced noise levels. Manufacturing is drawn on the latest science using advanced CAD/CAM systems and machines. Such precise approach optimizes the concentricity and blade tracking during a wide range of flight conditions.
- Designed for nitro and gas airplanes
- High efficiency over a wide range of operation.
- Extensive CAD/CAM process for optimal results
- Stronger materials guarantee lower noise levels
To avoid possible injuries please take note of the following safety precautions.
- Modifications to the propeller are not permissible!
- Never stand in the hazard zone in front of or next to one side of the propeller plane!
- Never touch the rotating propeller!
- Never re-use a damaged propeller!
- Never allow the propeller to exceed the stated maximum permissible rotational speed (RPM, see table).
|? in inches |
|Max. RPM ||? in inches ||Max. RPM ||? in inches ||Max. RPM |
|5" ||30700 ||12" ||13300 ||19" ||8300 |
|6" ||26600 ||13" ||12100 ||20" ||7850 |
|7" ||22200 ||14" ||11200 ||21" ||7500 |
|8" ||20000 ||15" ||10500 ||22" ||7170 |
|9" ||17400 ||16" ||9800 ||23" ||6900 |
|10" ||16000 ||17" ||9300 ||24" ||6570 |
|11" ||14300 ||18" ||8700 ||25" ||6300 |
Best performance, great value
I put this prop on a DA-70 with a 60mm drop 2 into 1 header. I cut 2" off of the length of the header and used an MTW TDH 110 rear exit canister muffler. At 4500' elevation I get 6900 rpm static. Prop is heavy enough to idle at about 1300 rpm. I don't have a scale big enough to measure static thrust yet. This will probably be my climb prop. I have a 24x12 too, but is probably too much for the ground running I am doing now. Plane is not done.
There are 4 holes partially drilled in the back for prop bolts. They are in the right place and correct spacing for my DA-70. These Graupner props are a great value. I have a 20x8 that I use on a DA-35 and a 20x10 for the same engine piped. These props make more static thrust at the same rpm than a wood Xoar or a carbon Mejzlik. They cost half as much as a Mejzlik, about the same as a Xoar, and are way more durable. You can hit all kinds of weeds and a little bit of gravel, sand the tips down and keep using them.
Reviewed by: Paul Leininger from BOZEMAN on 4/18/2019