prop numbers
12-18-2004 | 08:53 PM
#2
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From: west union, OH
RE: prop numbers
From what I have learned the 11 is the length of the prop and the 6 is the distance in inches the plane will travel forward for one rev of the prop assuming 100% efficiency
12-18-2004 | 09:02 PM
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From: lil hicktown,
SD
RE: prop numbers
yup... the 11 is the length and the 6 is the pitch of the prop.... the higher the second # the faster the plane will got, the lower the # the more power you will get
12-19-2004 | 11:21 AM
#4
My Feedback: (4)
RE: prop numbers
Yes, first number is diameter, second is pitch.
In general, higher pitch will give greater speed, or larger diameter will give you better vertical pull. However, there are limits to what prop any given engine will turn efficiently.
For example, a decent 46 two stroke may turn an 11 X 7 at decent rpm's giving okay vertical and fairly fast top speed, but you can't stick a 13 X 9 on it and expect it to fly very well. It's just too much prop for the engine.
Therefore, if you increase the pitch for faster top speed, you need to decrease diameter to keep the engine running in it's "efficient" range, and vice versa (larger diameter for better vertical pull means reducing pitch).
Dennis-
In general, higher pitch will give greater speed, or larger diameter will give you better vertical pull. However, there are limits to what prop any given engine will turn efficiently.
For example, a decent 46 two stroke may turn an 11 X 7 at decent rpm's giving okay vertical and fairly fast top speed, but you can't stick a 13 X 9 on it and expect it to fly very well. It's just too much prop for the engine.
Therefore, if you increase the pitch for faster top speed, you need to decrease diameter to keep the engine running in it's "efficient" range, and vice versa (larger diameter for better vertical pull means reducing pitch).
Dennis-
