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Old Sep 24, 2014, 07:42 AM
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Oman
Joined Aug 2014
90 Posts
Question
sizes of propellers

hello
any one have details about types and sizes of different propellers and what proper job each one can does
is ther any formula lets me making correct selection if i want ??
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Old Sep 24, 2014, 09:10 AM
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United States, IL, Glenwood
Joined Nov 2013
772 Posts
Way to many variables. Narrow it down. What are you looking for a prop for? What plane, and what motor and esc? Also what type of flying do you plan on doing.
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Old Sep 24, 2014, 03:57 PM
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Oman
Joined Aug 2014
90 Posts
Quote:
Originally Posted by Gregertman View Post
Way to many variables. Narrow it down. What are you looking for a prop for? What plane, and what motor and esc? Also what type of flying do you plan on doing.
do i understand from you that there is no standard formula used to sellect correct propeller without mention the motor, esc and type of flying ??
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Old Sep 24, 2014, 04:13 PM
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Gold Coast Coolangata, Australia
Joined Nov 2003
1,527 Posts
Quote:
Originally Posted by ali74 View Post
do i understand from you that there is no standard formula used to sellect correct propeller without mention the motor, esc and type of flying ??
Google search is your friend!

Try searching for ' formulas for model aircraft' and you will see many, such as;

http://www.airfieldmodels.com/inform...raft/formulas/

Also, there are very good online sites that include performance calculators that help you see the diff's between diff prop sizes/pitch. Like Ecalc;

http://www.ecalc.ch/motorcalc.php?castle&lang=en

Also, for electrics you need to understand the basics such as motor kv and ohm's law. Again, lots of good info can be obtained by Google. Have fun!
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Old Sep 24, 2014, 04:41 PM
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Oman
Joined Aug 2014
90 Posts
Quote:
Originally Posted by TomC View Post
Google search is your friend!

Try searching for ' formulas for model aircraft' and you will see many, such as;

http://www.airfieldmodels.com/inform...raft/formulas/

Also, there are very good online sites that include performance calculators that help you see the diff's between diff prop sizes/pitch. Like Ecalc;

http://www.ecalc.ch/motorcalc.php?castle&lang=en

Also, for electrics you need to understand the basics such as motor kv and ohm's law. Again, lots of good info can be obtained by Google. Have fun!
thank you tomC
great idea
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Old Sep 25, 2014, 08:14 AM
I like the violent stuff!
Costa Mesa, CA
Joined Oct 2004
1,213 Posts
For basic starters. Prop diameter should be 25-28 % of the wingspan of the plane. For small foamies use a slowfly prop. Pitch should not exceed 1/2 the diameter. Example, 10x4.7 should be max. Too much pitch can also draw too much current. So pitch is also related to motor kv value. A lower kv can swing a bigger prop. Good idea to start with recommended setups when starting out. Good luck and HAVE FUN!!!
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Old Sep 25, 2014, 04:21 PM
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Oman
Joined Aug 2014
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Originally Posted by Wingin' Wayne View Post
For basic starters. Prop diameter should be 25-28 % of the wingspan of the plane. For small foamies use a slowfly prop. Pitch should not exceed 1/2 the diameter. Example, 10x4.7 should be max. Too much pitch can also draw too much current. So pitch is also related to motor kv value. A lower kv can swing a bigger prop. Good idea to start with recommended setups when starting out. Good luck and HAVE FUN!!!
everything you wrote down clear to me except (prop diameter should be 25-28%of the wingspan of the plane)
please can you give an example ???
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Old Sep 25, 2014, 06:30 PM
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Joined Jun 2013
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40 inch wingspan, 10 inch prop. = 25%
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Old Sep 25, 2014, 09:42 PM
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Oman
Joined Aug 2014
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Originally Posted by KiloXray View Post
40 inch wingspan, 10 inch prop. = 25%
thank you indeed
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