Prop stress marks

[userix]

I have a new wizard x220s that I just flew today for the first time. I did some simple split s and rolls during the first 5 min flight and I noticed all props have stress marks on them. It seems like if I do more hard maneuvers, they will explode? These are 5051 props that come with the x220s wizard. All motors are spinning true with no wobbles and flight is pretty smooth.

I’m guessing these props can’t handle the torque and power? What props should I use for harsh freestyle maneuvers?

I didn’t crank down the nuts super tight. I just get it tight enough where the props don’t spin by themselves. I know overtightening can crack the hub and add stress

 

[PsyBorg]

What props are they? If they are gemfan toss em because you look at those sideways and they break. Should probably replace them anyways. Thats an awful big pitch for a stock wizard kit with only 20a esc's. Should be 5040 like the sales description states not sure how it ended up with 5051 props.

 

[userix]

I think it’s King Kong brand. The website does show it including 5051 props. The esc on the x220s is 30a 35a peak esc. It’s packs a good punch but I guess the props suck

 

[PsyBorg]

Ahh I missed the s when I did my search. Still no need for 5051 props on those motors for free style. 5040 to 5046 is better depending on your style and motors.

This is my latest build on 2406 2350kv motors on 5s with Dal 5046 cyclones and seems to be a perfect match. When I used 2306 motors the 5046 would generate too much heat for my liking specially when temps are over 85 degrees ambient. These are some tuning runs from the other day.

The only time I will use 5050 or higher is straight speed runs on bi blade cyclones.

 

[userix]

Ahh I missed the s when I did my search. Still no need for 5051 props on those motors for free style. 5040 to 5046 is better depending on your style and motors.

This is my latest build on 2406 2350kv motors on 5s with Dal 5046 cyclones and seems to be a perfect match. When I used 2306 motors the 5046 would generate too much heat for my liking specially when temps are over 85 degrees ambient. These are some tuning runs from the other day.

The only time I will use 5050 or higher is straight speed runs on bi blade cyclones.

Nice flying! Still trying to get the hang of landing. I’m still coming in too hot, digging into the ground, sheering off landing feet.

So how do Prop pitch work? Is the 5051 very aggressive in terms of torque and lift?

 

[PsyBorg]

Prop pitch is measured using size and pitch. The first number is always the diameter and the second is the pitch that will tell distance per revolution in a solid material. For example we use a 5040 prop. That means 50 is a 5 inch diameter and it would move an aircraft 4 inches per revolution. A 5150 would be a 5.1 inch diameter and move 5 inches per revolution.

THEN it gets tricky where motor torque, KV, stator size, blade count and amp draw come into play. The bigger the number the more torque is required thus slower rpm or larger stator size is needed for the same voltage. This can all be manipulated by changing the variables to optimize the performance. Which is why for the most part people stick to 5040 tri blades for freestyle to give good performance in rpm and aerodynamics for freestyle on the size of motors we use.

Pre built gear tends to be hyped up a LOT. I would go to the motor manufacturers page and see the actual spec sheet for that motor and make sure the set up is within the motors limitations. If it is and they stay cool enough rock what ever feels good to you. If not then consider a change so you get the best performance AND longevity from your gear.