My dynam hawk sky airplane came with 2 5 by 6 propellers, but I can't find any replacements. The closest one I can find to the right size is 6 by 4. But the propeller cannot have a 6 inch diameter because it would hit the planes body. Does anyone know of anywhere to by a 5 by 6 basic propeller? Places with big bulk would be nice.
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http://www.graysonhobby.com/catalog/images/MicroV3-Stats.jpg
It can probably fly straight up although it looks like the motor starts getting hot at full throttle. I would cut a notch out with a hot wire or an exacto knife and run the bigger prop. You won't be disappointed.
Hawksky stock propeller
When did you get your hawksky? All of the ones I have seen this year have had this propeller. I wonder when they switched.
What is the kv rating of your motor? I saw claims over at rcgroups that the stock motor is around 2200 kv. I crudely measured the air velocity behind the propeller to be about 4500 FPM. If my calculations are correct this comes out to be nearly 11,000 RPM with a 5x5 prop. Does your motor spin this fast?
http://www.nitroplanes.com/60p-dyp-1001-propeller.html
http://www.hobbypartz.com/60p-dyp-1001-propeller.html
Even though the hobbypartz version is listed under the EXI brand name it is equivalent to the Dynam part down to the part number.
However I recommend upgrading the power system on the hawksky. I put in a 2409-12T motor, a 30 amp ESC and a 7x6 prop. I had to cut a notch out of the fuselage for propeller clearance. Granted my stock motor was poor quality to begin with but the increase in performance was very dramatic.