how to determine prop size?
10-08-2008, 04:43 PM
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how to determine prop size?
How does one determine the prop size of an unknown propeller[sm=75_75.gif]? I have a prop from a downed model, but it is custom, so i have no idea how to find out what the prop size, or diensions are. Please help! Also, how do i find out what kind of brushless motor i need for my new spit.? It has a eflite li-po, e flight 25 amp esc, and the old brushless i had burnt out. I found out its max was 12 amps and i had a 25 amp esc so it completey destroyed itelf.
10-12-2008, 10:26 AM
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RE: how to determine prop size?
Of all the people I know in this hobby, ONE has a pitch gauge for determining the pitch of a propeller.... It's not a very common tool.
The diameter is easy... Just use a ruler.
Pitch on the other hand... About the only thing I can think to recommend is to take it to the local hobby shop and compare it to the props on the rack. You should be able to find one with a similar twist, which should give you an approximate pitch of the unknown prop.
The diameter is easy... Just use a ruler.
Pitch on the other hand... About the only thing I can think to recommend is to take it to the local hobby shop and compare it to the props on the rack. You should be able to find one with a similar twist, which should give you an approximate pitch of the unknown prop.
10-16-2008, 10:23 AM
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RE: how to determine prop size?
now you know 2 people because i have 3 different types 
6 inch pitch means in a perfect world it would pull the plan forward by that amount for every 1 rotation of the prop. high pitch higher pull lower pitch lower pull. 3d flying uses lower pitch/ pull so (ie 4.7*) the motors stay in their respective efficient power ranges.
6 inch pitch means in a perfect world it would pull the plan forward by that amount for every 1 rotation of the prop. high pitch higher pull lower pitch lower pull. 3d flying uses lower pitch/ pull so (ie 4.7*) the motors stay in their respective efficient power ranges.
