RC India
Welcome Guest, please login or register.
 
Pages: [1]   Go Down
0 Members and 1 Guest are viewing this topic. Topic Tools Topic Tools 
Read
« on: January 12, 2014, 11:18:14 AM »
docnayeem
Plane Lover
Forum Hero
*****

Reputation Power: 1 
docnayeem has no influence.
Offline Offline

City: Kolhapur
State: Maharashtra
RC Skills: Intermediate
Posts: 603
Join Date: Nov, 2013




Hello every one ....
Need help .... Props ... Pusher and puller ...
In an electric setup can a puller be used as a pusher ?
I guess yes I have read it on the net too to mount it reverse but does it give the same efficiency and thrust ?

And design wise what is the main difference in a puller and pusher prop.

Knowledgeable people ...
Awaiting replies
Thanks in advance
Logged
 

Read
« Reply #1 on: January 12, 2014, 08:12:36 PM »
Priyum
Tonight Im Flyin' You.
Plane Lover
Forum Veteran
****

Reputation Power: 5 
Priyum has no influence.
Offline Offline

City: New delhi
State: Delhi
RC Skills: Beginner
Posts: 373
Join Date: Mar, 2013

WingsForLife



Yes it can be done,just reverse the prop and change 2 out of 3 wires of the motor to esc and your'e done!
Logged

Tonight Im Flyin' You.
 

Read
« Reply #2 on: January 12, 2014, 08:16:27 PM »
anwar
Administrator
Forum Hero

*****

Reputation Power: 141 
anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!
Offline Offline

City: Doha (Qatar) & Thrissur
State: Kerala
RC Skills: Advanced
Posts: 11619
Join Date: Mar, 2009

RC India - Flying and racing with open minds !



Reversing a prop does not work that way... otherwise there would only be one type of props !

http://www.rcindia.org/rc-general-topics/basic-aerodynamics-for-rc-flying/msg72909/#msg72909

It will be less efficient when it is all said and done.
« Last Edit: January 12, 2014, 11:39:11 PM by anwar » Logged

Hangar : Please see my introduction.
RC India forum and me : About this forum.
 

Read
« Reply #3 on: January 13, 2014, 11:52:15 AM »
sushil_anand
Plane Lover
Forum Hero
*****

Reputation Power: 17 
sushil_anand has no influence.
Offline Offline

City: MUMBAI
State: Maharashtra
RC Skills: Intermediate
Posts: 1274
Join Date: Jul, 2009



Not true, Anwar. Reversing the prop AND rotation will will be as "normal". Think of it as just moving the motor from the rear to the front (of the prop)!
Logged

Hangar: Zlin 50L -120, CMPro Super Chipmunk, Ultimate Bipe EP, Imagine 50, Christen Eagle 160, Ultra Stick, Super Sports Senior
 

Read
« Reply #4 on: January 13, 2014, 12:49:24 PM »
anwar
Administrator
Forum Hero

*****

Reputation Power: 141 
anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!
Offline Offline

City: Doha (Qatar) & Thrissur
State: Kerala
RC Skills: Advanced
Posts: 11619
Join Date: Mar, 2009

RC India - Flying and racing with open minds !



I think you misread my message.  What I said (or intended) was that reversing the prop does nothing, and reversing the motor will result in an inefficient operation as the leading edge of the propeller is not the leading edge any more.
Logged

Hangar : Please see my introduction.
RC India forum and me : About this forum.
 

Read
« Reply #5 on: January 13, 2014, 02:32:42 PM »
girishsarwal
Plane Lover
Forum Hero

*****

Reputation Power: 17 
girishsarwal has no influence.
Offline Offline

City: Gurgaon
State: Haryana
RC Skills: Beginner
Posts: 1420
Join Date: May, 2012

DIYer



Anwar sir, I tend to agree with sushil sir. Reversing the prop will not have any affect on the pitch angle but will mirror the leading edge; This followed by a toggle in rotation will give the desired effect of converting the puller into a pusher, the LE will still be the LE. The idea of LH and RH props is more suited for multirotors and multi engine airplanes, where all of them have to throw air in the same direction with the counter rotation preserved
Logged

gs
 

Read
« Reply #6 on: January 13, 2014, 02:40:17 PM »
K K Iyer
Global Moderator
Forum Hero
*****

Reputation Power: 61 
K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!K K Iyer is a rising star!
Offline Offline

City: Indore
State: Madhya Pradesh
RC Skills: Intermediate
Posts: 5154
Join Date: Jan, 2012



@anwar sir,
With due respect, let's do this in 3 steps.
1. Turn the motor around so it faces backward
2. Interchange wires to reverse direction of rotation
3. Reverse the prop so that the 'leading edge' leads

Seen from behind, the prop orientation and direction of rotation will be identical in the tractor and pusher configurations.
(Whether the motor and cowl create more drag when ahead of / behind the prop is a different question....)
Logged
 

Read
« Reply #7 on: January 13, 2014, 02:43:53 PM »
docnayeem
Plane Lover
Forum Hero
*****

Reputation Power: 1 
docnayeem has no influence.
Offline Offline

City: Kolhapur
State: Maharashtra
RC Skills: Intermediate
Posts: 603
Join Date: Nov, 2013


Re:

I totally agree with Mr. K K Iyer ... From what literature I got to read ... There is no design difference in a pusher and puller prop ... In an electric setup
In a nitro or glow setup where the direction of rotation cannot be changed the prop has to be a pusher prop with an inverted helix
Logged
 

Read
« Reply #8 on: January 13, 2014, 02:55:44 PM »
anwar
Administrator
Forum Hero

*****

Reputation Power: 141 
anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!anwar is awe-inspiring!
Offline Offline

City: Doha (Qatar) & Thrissur
State: Kerala
RC Skills: Advanced
Posts: 11619
Join Date: Mar, 2009

RC India - Flying and racing with open minds !



Yes, you are right. The combined action does preserve the leading edge.

I was confused for a moment, and stand corrected. We had an incident at the field where someone had used a prop with the wrong leading edge, and his Floater/Bixler had severe thrust issues.

I hope my getting geriatric helps you avoid the leading edge problem when you mount your props ! Smiley

The same thing was discussed here :  http://www.rcindia.org/beginners-zone/pusher-configuration/
« Last Edit: January 13, 2014, 08:19:56 PM by anwar » Logged

Hangar : Please see my introduction.
RC India forum and me : About this forum.
 

Read
« Reply #9 on: January 13, 2014, 03:01:30 PM »
docnayeem
Plane Lover
Forum Hero
*****

Reputation Power: 1 
docnayeem has no influence.
Offline Offline

City: Kolhapur
State: Maharashtra
RC Skills: Intermediate
Posts: 603
Join Date: Nov, 2013


Re:

I knowledge is updated and confusion cleared thanks to all the experienced people around ....
Logged
 

Pages: [1]   Go Up
Jump to: