Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

OPS 60

Reply

Old 04-26-2007, 10:56 PM
  #1  
NoOneFlysAtMyClub
Thread Starter
My Feedback: (32)
 
Join Date: Nov 2003
Location: Forest Grove, OR
Posts: 436
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default OPS 60

Does anyone know where I can find specs and info [tuning] on a OPS 60 Super SPA RCA ABC FIRE engine???

Thanks, Tony
NoOneFlysAtMyClub is offline  
Reply With Quote
Old 04-26-2007, 11:55 PM
  #2  
glowplugboy
Senior Member
My Feedback: (17)
 
Join Date: Dec 2001
Location: Houston, TX
Posts: 962
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OPS 60

I believe this is the five port? If it is the five port or the three port, here are some practical starting points:

1. From the center of the head, measure 14" to the widest part of the tuned pipe. Sometimes the pipe has a lathe line denoting this, but I'm sure you know what I'm talking about. This is a very conservative pipe setting.

2. Tach readings at this length on an 11 X 7 will be in the 13,500 range on 10% nitro.

3. Start trimming 1/2" pieces off of the header and keep taching the engine. 1/2" pieces could account for as much as 500 rpm gain or little as zero. Expect to see noticeable power increase by 1 1/2" of trimming.

4. My experience with my OPS many years ago was the length ended up being right at 12 1/2" to 12 3/4", center of head to wide part of the pipe. Ground tach readings @ 15,500 on 10% nitro with a wood 11 X 7. I loved to hear it unload in the air! Any shorter on the pipe and plugs popped after one flight. Not knowing what size prop or the amount of nitro could affect these parameters, so consider these figures ballpark.

I hope this helps.
Regards,
Mike
glowplugboy is offline  
Reply With Quote
Old 04-27-2007, 07:01 PM
  #3  
rcflyer1970
My Feedback: (212)
 
rcflyer1970's Avatar
 
Join Date: Dec 2004
Location: SUN CITY, AZ
Posts: 191
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OPS 60

Here's OPS engines old spec sheet for tuning.
Attached Thumbnails Click image for larger version

Name:	Mj24503.jpg
Views:	17
Size:	189.7 KB
ID:	673528  
rcflyer1970 is offline  
Reply With Quote
Old 04-27-2007, 08:01 PM
  #4  
NoOneFlysAtMyClub
Thread Starter
My Feedback: (32)
 
Join Date: Nov 2003
Location: Forest Grove, OR
Posts: 436
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OPS 60

Thanks to you both for the info. A great help.

I am considering changing the head to accept the Nelson plug. They are tougher and less $$$ than a standard plug.
NoOneFlysAtMyClub is offline  
Reply With Quote
Old 04-27-2007, 11:58 PM
  #5  
Rudeboy
 
Rudeboy's Avatar
 
Join Date: Dec 2002
Location: Kortessem, BELGIUM
Posts: 3,508
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OPS 60

Why would you want to use Nelson racing plugs on a classic pattern engine? I tend to think they will turn out to be way too cold for reliable operation on a throttled "low revving" engine... They are tougher because they are very cold plugs.

Here's a Nelson HD and a Rossi 4... see the difference?
Attached Thumbnails Click image for larger version

Name:	Db83711.jpg
Views:	6
Size:	31.1 KB
ID:	673731  
Rudeboy is offline  
Reply With Quote
Old 04-29-2007, 01:17 PM
  #6  
NoOneFlysAtMyClub
Thread Starter
My Feedback: (32)
 
Join Date: Nov 2003
Location: Forest Grove, OR
Posts: 436
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OPS 60

Rudeboy,

I think you are correct. After much searching I found this is indeed a lower rpm dedicated pattern engine, not the screamer I had hoped for. [] A Nelson plug would not be a wise choice. I should find a Bridi XLT or Curare to build. That would be perfect for the OPS.

Tony
NoOneFlysAtMyClub is offline  
Reply With Quote
Old 04-29-2007, 10:38 PM
  #7  
glowplugboy
Senior Member
My Feedback: (17)
 
Join Date: Dec 2001
Location: Houston, TX
Posts: 962
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OPS 60

I agree. It would be hard to get this engine over 17,000, and if you could, that would be the absolute top end output and risk blowing it up. See if you can find an OS .77 DF. Now that will get the rpms you want and will be the same size....
Regards,
GPB
glowplugboy is offline  
Reply With Quote
Old 04-29-2007, 11:32 PM
  #8  
glowplugboy
Senior Member
My Feedback: (17)
 
Join Date: Dec 2001
Location: Houston, TX
Posts: 962
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OPS 60

Low and behold, there is a NIB OS Max .77 DF on Ebay as we speak. Very reputable dealer selling it, too. Just type in OS Max .77DF in the search and you will have it....
glowplugboy is offline  
Reply With Quote
Old 04-30-2007, 03:42 PM
  #9  
MJD
My Feedback: (1)
 
MJD's Avatar
 
Join Date: May 2003
Location: Orangeville, ON, CANADA
Posts: 8,629
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OPS 60

ORIGINAL: roadtripessentials

Rudeboy,

I think you are correct. After much searching I found this is indeed a lower rpm dedicated pattern engine, not the screamer I had hoped for. [] A Nelson plug would not be a wise choice. I should find a Bridi XLT or Curare to build. That would be perfect for the OPS.

Tony
The OPS .60 pattern engine is a sweetheart, and it is no slouch in the power department, but no it isn't the one you were thinking of. Mine hauled an old Cass Pulsar bipe around right smartly, and it weighed in around 8 pounds (oink). Looking forward to putting it in a new home, whatever that home may be, dunno yet. Likely just what you're talking about.

Ugh I just nicked my index finger with an Xacto blade and now there are little red spots on all the keys I just used.. doh!

MJD
MJD 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