VPP - Variable Pitch Prop 4D flying Discuss VPP - Variable Pitch Prop 4D flying in this forum

stupid question, can i use forward and reserve esc instead of vpp

Reply
Old 02-11-2009, 12:34 PM
  #1
dcwebaccount
Thread Starter
 
Join Date: May 2008
Location: hong kong, HONG KONG
Posts: 5
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default stupid question, can i use forward and reserve esc instead of vpp

hi, if i have esc that can be configured with forward and reserve, can i use it instead of vpp system, if i am esc designer, what extra care or feature that i can achieve vpp like function by simple "forward" and "reserve"
dcwebaccount is offline  
Reply With Quote
Old 02-12-2009, 02:15 PM
  #2
Rodine Air Force
 
Rodine Air Force's Avatar
 
Join Date: Sep 2006
Location: Zirovnica, SLOVENIA
Posts: 16
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: stupid question, can i use forward and reserve esc instead of vpp

1. Reactions would be too slow.
2. Spinning a propeller backwards would not produce same thrust as forward.
Even with VPP unit ESC has to have a very quick response to instantly adapt the RPM to pitch change.
Rodine Air Force is offline  
Reply With Quote
Old 02-12-2009, 03:33 PM
  #3
dcwebaccount
Thread Starter
 
Join Date: May 2008
Location: hong kong, HONG KONG
Posts: 5
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: stupid question, can i use forward and reserve esc instead of vpp

Quote:
Even with VPP unit ESC has to have a very quick response to instantly adapt the RPM to pitch change.
then what kind of esc you would recommend ? any requirements ?

thanks !!!
dcwebaccount is offline  
Reply With Quote
Old 02-13-2009, 01:04 PM
  #4
Rodine Air Force
 
Rodine Air Force's Avatar
 
Join Date: Sep 2006
Location: Zirovnica, SLOVENIA
Posts: 16
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: stupid question, can i use forward and reserve esc instead of vpp

Well like I said fast RPM response is very important. Governor mode is not necessary because it is better to set up throttle and pitch curve on a transmitter for 4D and another setting for 3D or for classical aerobatic flying. This way, modes can be switched in flight. To switch of governor mode on an ESC means programming on the ground. So, only important feature for 4D flying is a fast RPM response. Everything else is same as for 3D (minimum weight, cut off,…). Oh and more affordable price than CC Phoenix ESC.
Rodine Air Force is offline  
Reply With Quote
Old 02-14-2009, 12:51 AM
  #5
dcwebaccount
Thread Starter
 
Join Date: May 2008
Location: hong kong, HONG KONG
Posts: 5
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: stupid question, can i use forward and reserve esc instead of vpp

thanks Rodine Air Force
dcwebaccount is offline  
Reply With Quote
Old 02-22-2009, 11:26 PM
  #6
hellblastervolly
 
Join Date: Mar 2004
Location: Lancaster, PA
Posts: 231
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: stupid question, can i use forward and reserve esc instead of vpp

If you dont use Governor keep an eye on the pitch and RPM. You can easy overamp your system.

Fernando
hellblastervolly is offline  
Reply With Quote
Old 02-23-2009, 01:18 PM
  #7
Rodine Air Force
 
Rodine Air Force's Avatar
 
Join Date: Sep 2006
Location: Zirovnica, SLOVENIA
Posts: 16
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: stupid question, can i use forward and reserve esc instead of vpp

If you open the pitch too much you will not get much of a thrust. I set the pitch curve end point between one and two amps over specified max current for the motor. This way I got the most thrust
Rodine Air Force is offline  
Reply With Quote
Old 03-27-2009, 02:36 PM
  #8
brandonsmit
 
Join Date: Mar 2008
Location: , MA
Posts: 3
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: stupid question, can i use forward and reserve esc instead of vpp

Hey All,
So, I'm currently trying to do just what the orginal guy suggested ... I'm not necessarily looking to fly 4-D but want to have short landing and reverse on the ground for handling.

I'm using a MGM-Compro 2560 Z-Series ... which is a car/boat ESC and therefore has a reverse capability.

Is there a way to set up the radio so that a "Neutral" Throttle setting is the lowest point in one switch setting and once the switch is flipped, the reverse throttle curve is active?

Hopefully that makes sense. I basically don't want to try flying with the throttle in the neutral position ...

Thanks
Brandon
brandonsmit is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 01:29 PM.