Notices
YS Engines Support Direct support from YS Performance Engines by Dave Shadel

YS160DZ loads up in vert

Old 05-24-2005, 03:23 PM
  #1  
JohnW
Senior Member
Thread Starter
My Feedback: (6)
 
JohnW's Avatar
 
Join Date: Mar 2002
Location: Lincoln, NE
Posts: 1,815
Likes: 0
Received 0 Likes on 0 Posts
Default YS160DZ loads up in vert

Similar question to byoung's recent question, but a bit different.

I load up at the top of verticals when at WOT. Flying level at mid throttle, ready to do 1/2 square loop, pull to vertical and apply WOT. Transision to WOT is typical YS, ie great. However, by the time I'm ready to push or pull to level at the top of the vertical leg, the engine has started to load up, RPM drops, and there is a lot lot of smoke. It will clear out a about 2-3 seconds later at WOT after I pull to level at the top.

The problem seems most pronounced when I need WOT after the engine has been running in the midrange for a while. I have however noted the issue will occur in about any WOT vertical if I hold the vertical long enough. WOT in level or even 45's never seem to produce the issue, only verts. No other issues noted. Engine runs great otherwise. Idle and transition and WOT (not in vert) are fine.

Engine has about 15 gallons in it, using CoolPower 30% heli, APC 17x10 standard(not the narrow), OS F. Regulator never touched and is set as per factory, high needle set about 1-1/4 to 1-1/2. I have set the valves, but it was about 8 gallons ago. The engine did this from day one to a certian extent. The issuse is just more pronounced recently.

I would like some expert advice before I fiddle with it anymore. Suggestions? Thanks.
Old 05-24-2005, 06:08 PM
  #2  
Dave Shadel
Senior Member
 
Join Date: Apr 2002
Location: Gardnerville, NV
Posts: 5,385
Likes: 0
Received 1 Like on 1 Post
Default RE: YS160DZ loads up in vert

Weird!

Try a different prop size, maybe a little heavier.
Old 06-01-2005, 01:01 AM
  #3  
JohnW
Senior Member
Thread Starter
My Feedback: (6)
 
JohnW's Avatar
 
Join Date: Mar 2002
Location: Lincoln, NE
Posts: 1,815
Likes: 0
Received 0 Likes on 0 Posts
Default RE: YS160DZ loads up in vert

Thank's Dave, you were right on. I checked, and I was turning the 17x10 well over 8,500 RPM. I could swear that it wasn't over 8,500 a few weeks ago with that prop, but the point is moot. I propped to APC 17x12, RPM dropped to 8,350, and my problem went away.
Old 06-01-2005, 07:08 AM
  #4  
Dave Shadel
Senior Member
 
Join Date: Apr 2002
Location: Gardnerville, NV
Posts: 5,385
Likes: 0
Received 1 Like on 1 Post
Default RE: YS160DZ loads up in vert

Dave guesses right!

Hasn't happened often lately.

Good Flying!

Dave

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 -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.