RC Jets Discuss RC jets in this forum plus rc turbines and ducted fan power systems

OS 91 DF engine help please!

Reply
Old 07-04-2007, 08:34 AM
  #1
Dblex
Thread Starter
 
Dblex's Avatar
 
Join Date: Jul 2005
Location: Corpus Christi , TX
Posts: 592
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default OS 91 DF engine help please!

Well, its July 4th, and its been pouring rain for days in Texas.....no flying. Cant get my OS91 started to test fly this used YAF-16A that I picked up.

I put an arrow to the air mixture valve to ask a question....from the closed position and the body adjustment sitting at 90deg, how many rounds out do I need to start at? Im assuming this is just like the high end needle? New to DF engines so any thing helps!

thanks and have a great 4th of July!
Attached Thumbnails
Click image for larger version

Name:	Us52938.jpg
Views:	12
Size:	58.3 KB
ID:	716056  
Dblex is offline  
Reply With Quote
Old 07-04-2007, 08:58 AM
  #2
Danger38
 
Join Date: Feb 2002
Location: Fayetteville, TN
Posts: 38
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS 91 DF engine help please!

From the closed position try 2 rounds out that should get you started then adjust from there and if the engine been sitting for a while take the glow plug out and put a few drops in the hole this should get you started and get the fuel to the carb. hope this help.

Robert
Danger38 is offline  
Reply With Quote
Old 07-04-2007, 09:38 AM
  #3
ECalderon
 
ECalderon's Avatar
 
Join Date: Dec 2001
Location: Santiago, CHILE
Posts: 167
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS 91 DF engine help please!

Hi:

Two turns open is a good place to start.

To start my engines, especially after the plane has been unflown for a while, I disconnect the pressure tubbing from the fan, and with a siringe I put pressure in until I can see the fuel just getting to the carburator, then I unscrew the plug and do as Robert said. That way the engine starts at the first try every time. Doing it this way, the hex screw at the fan lasts a lot longer. Remember to put some grease in yor hex starter, otherwise the screw won´t last long (ask me how I know).

Regards

Eduardo
ECalderon is offline  
Reply With Quote
Old 07-04-2007, 11:16 AM
  #4
Dblex
Thread Starter
 
Dblex's Avatar
 
Join Date: Jul 2005
Location: Corpus Christi , TX
Posts: 592
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS 91 DF engine help please!

Man, you guys are great!

On the starter cone, the hex backs out when starting, its threaded opposite. So, am I going to have to pull the whole thing out and use a piston lock tool to tighten her down? or can I do my best from upfront and loctite it in? For my helis we use a locking tool to tighten the fans on, but its easy to get to...

am I gonna have to pull the whole thing out? LOL?!?!?!?

great 4th!
Dblex is offline  
Reply With Quote
Old 07-04-2007, 11:26 AM
  #5
Jet Doctor
 
Jet Doctor's Avatar
 
Join Date: Sep 2003
Location: Johannesburg, SOUTH AFRICA
Posts: 305
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS 91 DF engine help please!

Loctite is the best way. You can hold the fan using a rag and tighten as best as you can. Leave until Loctite is set.
Jet Doctor is offline  
Reply With Quote
Old 07-05-2007, 08:36 PM
  #6
Rudeboy
 
Rudeboy's Avatar
 
Join Date: Dec 2002
Location: Kortessem, BELGIUM
Posts: 3,499
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS 91 DF engine help please!

If you don't want to take the whole thing apart, you can fill the cilinder with oil (through the plug hole) to act as a crank lock. Then use a good hex wrench to tighten it down. Maybe use a good pair of Vise Grips on the hex wrench.
Rudeboy 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 02:09 AM.