F2B carbon propeller

We are now introducing a three-blade carbon fiber propeller specially designed for F2B class aerobatic models with electric motors such as 3520/18 Cobra, Badass or others.
Before the production of the final series, the propeller was tested many times over the past 2 years, on various aerobatic models weighing from 64oz (1820g)  to 70oz (2000g), under various weather conditions. Various combinations of propeller diameters from 340mm(13,4in) to 320mm(12,5in) and various combinations of propeller pitch from 140mm(5,5in) to 180mm(7,1in) were tested during the tests.
Now the final and best version is presented, which is ideal for both standard weather conditions of flight and for very hot conditions with very thin air, with the possibility of using both very light models weighing less than 64oz(1820g) and very heavy aircraft weighing 2000g (70oz) and heavier.
Using this propeller during one hot summer day on two different airplanes and on two different electric motors, the following results were achieved using an electric battery Thunder Power (TP2800/6S/25C), a flight controller and a timer from Igor Burger / Spin 66.
Flight time 5 minutes 10 seconds.
Flight speed - 5.2 sec per one circle.
The number of flights - 24 (12 Sbach342 + 12 Extra330)
Flight weight of the Sbach 342 model - 65 oz (1850 grams)
Flight weight of the Extra 330 model - 66 oz (1880 grams)
The air temperature during the day is from +30C (86F) target (morning and evening), to +35(95F) at lunchtime.
Remaining battery charge on Sbach 342 aircraft from 22 - 23% (Day) - up to 25 - 27% (morning-evening), line length - 64 feet (19,5 m), 0.015 (0.38 mm), Badass 3520/18 engine
Remaining battery charge on aircraft Extra 330 from 20 - 22% (Day) up to 23-25% (morning-evening) lines 65 feet (19,8 m), 0.015, Cobra 3520/18 engine.
Propeller diameter - 330 mm (13 in)
Propeller pitch - 160 mm (6,3 in)
Inner diameter for shaft - 8 mm (0,3 in)
Materials - Carbon fiber, Fiberglass, Carbon roving, Epoxy resin, Acrylic two-component varnish.
Propeller weight coated with varnish and ready to fly - 20 grams (0,7oz)
Manufacturing - controllineparts
Handmade Andrii Sopelniak, Kiev, Ukraine / FAI 91834