Hello,

I was wondering what a prop that has higher numbers means compared to smaller numbered props? For an example, I have a 5 x 5 prop, and I also have a 6 x 3 prop. Which numbers represent thrust or power and which number represents speed?
Would the 6 x 3 perform better on a 400 motor then a 5 x 5?

Any info would be very helpful, thank you ;o)

bookstar75,
I'll use the 6x3 prop that you mentioned as an example. The first number (6 in this case) represents the size of the prop. It is the diameter of the prop. The prop in our example is 6 inches in diameter. The second number (3 in this case) is the pitch of the prop. In theory the pitch represents how far the prop will move with each turn of the prop. The prop in our example has a pitch of 3, meaning that it will move forward 3 inches for every rotation of the prop.

Unfortunately there is no set prop to use in every circumstance. It can take some experimentation to find what works best with our plane/engine combination. But there are some rules that will help you find which prop to use. The higher the pitch the faster the plane will more. The lower the pitch the more power the plane will have, power is most noticed when you pull vertical. Unfortunately you lose one to get the other.

Hope this helps

Ken

Given, for example, a 10 x 6 prop, the first number is the diameter in inches (10"). The second number is the pitch. That is the distance in inches (6) that the prop will move through a solid surface in one revolution. This is theoretical, since the prop will slip in the air. GIVEN THE SAME RPM, more pitch, less diameter equals more speed, less pull. Larger diameter, less pitch gives more pull and less top speed.

Dr.1

so...now that the above posts answered the question....

What plane are you working on? it may help others give suggestions for you.....

it also may take a little experimentation...

I tried several different props on my Zagi with a MEga 16/15 4 brushless motor,,, the 5 x 5 to the 6 x 4 were all within the proper range for amp draw, but I just like the way it flies better with a 5.5 x 4.5 prop......