Go Back  RCU Forums > RC Airplanes > RC Jets > Turbine Clinic > Jet Central Turbines - Artes Jet
Reload this Page >

Weird sound when accelerating past the half throttle (Rabbit VT90)

Jet Central Turbines - Artes Jet Jet Central Turbines formerly the Artes Jet forum

Weird sound when accelerating past the half throttle (Rabbit VT90)

Reply

Old 08-03-2017, 08:52 AM
  #1  
RobinLeblond
Thread Starter
 
RobinLeblond's Avatar
 
Join Date: Oct 2008
Location: St-Jean sur Richelieu, QC, CANADA
Posts: 444
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Weird sound when accelerating past the half throttle (Rabbit VT90)

Hello all,

When accelerating while in the upper half of the throttle, the engine is doing a sound like some old Russian fighter jets (or some of our CF-18) does at startup, maybe a compressor stall sound, I'm not sure. I have a far souvenir to have talked with Eric long time ago and that he helped me correct this issue by make me change something in the ECU parameters, but I cannot find any trace of this discussion. So here I am, do you have any idea of what may cause this and how to correct problem (if itís a problem that need to be corrected). (also if I slowly accelerate it doesnít do it, but as soon as I raise the throttle a little to fast it does it, ALSO it does it on the test stand and I don't remember having heard it while in flight).

Thanks
RobinLeblond is offline  
Reply With Quote
Old 08-03-2017, 02:20 PM
  #2  
jetmon
 
Join Date: Nov 2003
Location: Mexico CityD.F., MEXICO
Posts: 226
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Hello Robin
It looks like you have the acceleration time too fast, hot wether can make this happens
If your ECU is unlock, go to the Run menu and increase the acceleration delay, if it is locked, please contact Jose Melendez atrcjets12@hotmail.com to instruct you on how to unlocked it,
Regards
jetmon is offline  
Reply With Quote
Old 08-04-2017, 03:49 AM
  #3  
RobinLeblond
Thread Starter
 
RobinLeblond's Avatar
 
Join Date: Oct 2008
Location: St-Jean sur Richelieu, QC, CANADA
Posts: 444
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Thanks Juan, it is unlocked, I will make other tests maybe tonight and let you know. By the way, do you have the initial/factory values for all the setting, I would like to keep a copy of all those value in case a massive extraterrestrial EMP wave it us and erase everything in the ECU memory.... ;-)
And also because I think we did change this value a few year ago and would like to confirm it by comparing with the factory values (of the original Rabbit VT-90)

Thanks
RobinLeblond is offline  
Reply With Quote
Old 08-04-2017, 06:34 AM
  #4  
RobinLeblond
Thread Starter
 
RobinLeblond's Avatar
 
Join Date: Oct 2008
Location: St-Jean sur Richelieu, QC, CANADA
Posts: 444
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Here a video took last weekend, we hear the sound at : 1:02, 1:22 and 1:29

http://www.commandantdrakis.com/rabbit.mov

Thanks,
RobinLeblond is offline  
Reply With Quote
Old 08-07-2017, 04:23 AM
  #5  
RobinLeblond
Thread Starter
 
RobinLeblond's Avatar
 
Join Date: Oct 2008
Location: St-Jean sur Richelieu, QC, CANADA
Posts: 444
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

I did some tests and changed the acceleration delay from 26 to 31 and its way better. It still does it some time when lowering and re-accelerating right back in the upper quarter of the throttle, so I will do more adjustment over time. Thanks
RobinLeblond is offline  
Reply With Quote

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


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service