# Thread: What is The unit of (impeller) measurement

1. ## What is The unit of (impeller) measurement

What is The unit of impeller measurement mean ?

14/19 or 15/20 or whatever

What The first number mean and the second .......

and which unit they use ( mm - inch - ,,,,,,,,,! )

2. الرقم الاول للقومه الرقم الثاني للخط
Originally Posted by red fox
what is the unit of impeller measurement mean ?

14/19 or 15/20 or whatever

what the first number mean and the second .......

And which unit they use ( mm - inch - ,,,,,,,,,! )

3. Originally Posted by red fox
What is The unit of impeller measurement mean ?

14/19 or 15/20 or whatever

What The first number mean and the second .......

and which unit they use ( mm - inch - ,,,,,,,,,! )

Second number = trailing pitch

4. Originally Posted by boBO
الرقم الاول للقومه الرقم الثاني للخط

turn your keyboard back onto english

5. Will do
But next time

Originally Posted by mongorunner
turn your keyboard back onto english

6. Originally Posted by mongorunner
turn your keyboard back onto english
Translate :

The First No. For Acceleration ( wholeshot )
The Second No. For Top End speed

Second number = trailing pitch

And which measurement unit they use ?? cm OR ...

8. degrees

9. Originally Posted by jp1300r
degrees
So,

if i add 2mm to 15/20 prop that will be equal = 15/22 or ?!

10. Originally Posted by red fox
So,

if i add 2mm to 15/20 prop that will be equal = 15/22 or ?!
No. It will be a 15/20 with 2mm added to the trailing edge.