New Products Flash Sale
Thread Tools
Old Jul 07, 2012, 09:33 AM
greggk is offline
Find More Posts by greggk
Registered User
Joined Dec 2007
410 Posts
Discussion
3 Blade Propeller...

Hi all,
Have a motor combo on a Hacher A40-10S that works well on a 2-BLADE 15x7.

I want to use a 3-BLADE is there a "general" conversion that would get me close, I thought I read somewhere that you reduce the diameter 1 size?? I was going to try a 13x8 3-BLADE

Thanks
greggk is offline Find More Posts by greggk
Reply With Quote
Sign up now
to remove ads between posts
Old Jul 07, 2012, 09:36 AM
visioneer_one is offline
Find More Posts by visioneer_one
Registered User
visioneer_one's Avatar
St. Thomas, VI
Joined May 2001
183 Posts
I was taught that you go down one and up one.
Down in diameter, up in pitch.
visioneer_one is offline Find More Posts by visioneer_one
Last edited by visioneer_one; Jul 07, 2012 at 01:54 PM.
Reply With Quote
Old Jul 07, 2012, 12:07 PM
scatsob is offline
Find More Posts by scatsob
Bypass Ratio = Infinity
scatsob's Avatar
United States, NC, Jacksonville
Joined Apr 2006
1,653 Posts
This wont help your situation but I have a setup that uses an 18x12 for 2kW and I get the same 2kW with a 15.5x12 4-blade APC prop. I would say the 13x8 would be a good place to start. Just put it on a watt meter and see how it does.
scatsob is offline Find More Posts by scatsob
Reply With Quote
Old Jul 08, 2012, 03:39 AM
hul is offline
hul
Find More Posts by hul
hul
Registered User
hul's Avatar
Switzerland
Joined Mar 2003
2,153 Posts
90% of the diameter, same pitch, going from 2 to 3 blades (if the blades have the same shape)
84% of the diameter, same pitch, going from 2 to 4 blades (if the blades have the same shape)
see http://www.mh-aerotools.de/airfoils/ under propellers -> equivalent multiblade propellers

Hans
hul is offline Find More Posts by hul
Reply With Quote


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion EMP Propellers 3- Blade Still Available ? gva1956 Fuel Plane Talk 2 Feb 02, 2013 03:35 PM
Question 2 or 3 Blade Propellers? Free Indoor Pattern/F3P 4 Apr 13, 2012 09:38 AM
Discussion 3-blade propeller instead of common propeller Karas Power Systems 4 Jun 21, 2011 06:00 AM
Free GWS 4-Blade and 3-Blade Propellers (One Day Only 02/18/2002) GoEFlight Vendor Talk 0 Feb 18, 2002 12:42 AM
Free GWS 4-Blade and 3-Blade Propellers (One Day Only 02/18/2002) GoEFlight Aircraft - Electric - Airplanes (FS/W) 0 Feb 18, 2002 12:33 AM