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what would be a good size 3 bladed prop as a replacement for 13x4 apc prop (2 bladed)

gangreen

Junior Member
#1
I have a Funcub (himax tuning setup) with a 13x4 apc prop. As this is a big prop, i hits the ground often when landing with added weight like gopro etc...
I'm looking for a 3 bladed prop as a replacement for the 13x4 apc, as the lenght of the 3 blade prop should be shorter.
Can anybody tell me what 3 bladed prop size a should buy so a keep the caracteristics of a 13x4 apc?

Thank you!
Thibault
 

willsonman

Builder Extraordinare
Mentor
#3
General rule from going 2blade to 3blade is down an inch in diameter and up an inch in pitch. So yes, 13x4x2 to a 12x4x3. Good luck finding a 12x5x3.
 

xuzme720

Dedicated foam bender
Mentor
#4
General rule from going 2blade to 3blade is down an inch in diameter and up an inch in pitch. So yes, 13x4x2 to a 12x4x3. Good luck finding a 12x5x3.
I thought going up in pitch was for going to a 4 bladed prop as in; 13x4x2=12x4x3=12x5x4
Please let me know if I have that wrong, it's just what I heard from one of my flying buddies waay back.
 

willsonman

Builder Extraordinare
Mentor
#5
That rule is true as well. Whenever going from two to more blades follow the rule. The thing to keep in mind is that its a GENERAL rule. Any electric pilot should have their watt meter handy to make sure everything is in check.