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

Problems with Rossi 61 RIRE

Reply

Old 07-05-2004, 05:22 PM
  #1  
Evil Homer
Senior Member
Thread Starter
 
Join Date: Sep 2003
Location: CubbingtonWarwickshire, UNITED KINGDOM
Posts: 331
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Problems with Rossi 61 RIRE

I have a Rossi 61 RIRE which i am really battleing to get running properly, running 10x6 APC on 0 % fuel with 1 shim cannot get more than 13700 way i figure this should be up in the 18's.
Pipe is at about 250 at the mo, but not making much difference.
Anyone got info on which way the backplate should be mounted on as well as which drive hole to use on the rotary valve as this has been fiddled by previous owner and i dont have a reference to compare to!
Evil Homer is offline  
Reply With Quote
Old 07-05-2004, 05:31 PM
  #2  
ChuckAuger
Senior Member
My Feedback: (12)
 
Join Date: Dec 2001
Location: Pampa, TX
Posts: 5,133
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Problems with Rossi 61 RIRE

If it is a disk valve version, the carb should be at about 1~2 O'Clock looking at the backplate. The disk should be timed to where it opens just a few degrees after BDC, normal rotation, looking into the carb.
ChuckAuger is offline  
Reply With Quote
Old 07-05-2004, 09:45 PM
  #3  
r-c-guy
Senior Member
My Feedback: (37)
 
Join Date: Mar 2002
Location: Hilton Head Isl, SC
Posts: 204
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Problems with Rossi 61 RIRE

Rossi's do like some nitro...

randy
r-c-guy is offline  
Reply With Quote
Old 07-05-2004, 10:38 PM
  #4  
Razor-RCU
Senior Member
My Feedback: (50)
 
Razor-RCU's Avatar
 
Join Date: Mar 2002
Location: Mira Mesa, CA
Posts: 5,405
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Problems with Rossi 61 RIRE

5% maybe... a 10x6? What are you flying?

Jeff- I was getting a little over 14K on a 11x7 APC on the Augered Rossi-60... Don't think I am getting it on the pipe properly, where would you recommend going from here prop-wise?

I could hack the header...
Razor-RCU is offline  
Reply With Quote
Old 07-05-2004, 11:03 PM
  #5  
ChuckAuger
Senior Member
My Feedback: (12)
 
Join Date: Dec 2001
Location: Pampa, TX
Posts: 5,133
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Problems with Rossi 61 RIRE

You will just have to tune the pipe and see what you get...a tach and a tubing cutter will tell the tale
ChuckAuger is offline  
Reply With Quote
Old 07-06-2004, 11:51 AM
  #6  
Evil Homer
Senior Member
Thread Starter
 
Join Date: Sep 2003
Location: CubbingtonWarwickshire, UNITED KINGDOM
Posts: 331
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Problems with Rossi 61 RIRE

Actually i was hoping to go overboard and use a 10x8, but so far the proformance has been dismal to say the least so i have not migrated any further.
Going to see what i can do with the pipe and trim it a bit.
Evil Homer is offline  
Reply With Quote
Old 07-06-2004, 12:38 PM
  #7  
der_steuermann
Senior Member
My Feedback: (2)
 
der_steuermann's Avatar
 
Join Date: Nov 2002
Location: Stolberg, GERMANY
Posts: 238
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Problems with Rossi 61 RIRE

squid1,

I'd mount a fine-balanced 9*9 APC for pipe tuning purposes. Which pipe do you use? Are pics available?

If the pipe has a biggest diameter of approx. 42 mm then I'd start with 310 mm distance from the glow plug to the weld seam of the double cone or the deflector plate respectively. Then shorten the header in 5 mm increments until the rpms begin to decrease. That should happen at about 290 mm. 10% nitro should be OK.

Do you use pipe or crankcase pressure?
der_steuermann is offline  
Reply With Quote
Old 07-06-2004, 12:45 PM
  #8  
ChuckAuger
Senior Member
My Feedback: (12)
 
Join Date: Dec 2001
Location: Pampa, TX
Posts: 5,133
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Problems with Rossi 61 RIRE

ORIGINAL: squid1

Actually i was hoping to go overboard and use a 10x8, but so far the proformance has been dismal to say the least so i have not migrated any further.
Going to see what i can do with the pipe and trim it a bit.
Something is wrong with it if it won't break 14K wit a 10X6
ChuckAuger is offline  
Reply With Quote
Old 07-06-2004, 05:01 PM
  #9  
Evil Homer
Senior Member
Thread Starter
 
Join Date: Sep 2003
Location: CubbingtonWarwickshire, UNITED KINGDOM
Posts: 331
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Problems with Rossi 61 RIRE

I am using crankcase pressure, current pipe length is possibly on the short side (cant measure it on a business trip at the mo), i am using a MAC pipe, think the measurement is about 260 from glow to "fat" section will take some pics when i get back, what kinda figures should i be looking at getting with the 10x6, i would have thought about 17k but could be way off the mark!!!
Evil Homer is offline  
Reply With Quote
Old 07-06-2004, 05:56 PM
  #10  
ChuckAuger
Senior Member
My Feedback: (12)
 
Join Date: Dec 2001
Location: Pampa, TX
Posts: 5,133
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Problems with Rossi 61 RIRE

You ought to be able to get better than 14K on a 10X6 with open exhaust IMHO.
ChuckAuger is offline  
Reply With Quote
Old 07-06-2004, 06:20 PM
  #11  
der_steuermann
Senior Member
My Feedback: (2)
 
der_steuermann's Avatar
 
Join Date: Nov 2002
Location: Stolberg, GERMANY
Posts: 238
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Problems with Rossi 61 RIRE

the measurement is about 260 from glow to "fat" section
Unfortunately 260 mm pipe length is too short for a .60 engine (even for a Rossi DF engine). As suggested above please start with 310 mm.

what kinda figures should i be looking at getting with the 10x6, i would have thought about 17k but could be way off the mark!!!
We don't know your speed frame yet, but in combination with your Rossi ducted fan engine a 10*6 sport prop is the wrong choice for speed. If your fuse is slim (same width as the engine) and the wing airfoil designed for speed application these pylon props should work fine for the first flights:

APC 8.75X9.25W (LP088925W) and
APC 8.75X9.5NN (LP08895NN)

Both props feature the 14.5 mm thick D1 hub being a must for your engine unloading significantly in the air. Static rpms should be in the 20K region.

If you purchased the engine used, did you check the bearings and the conrod for clearance? Ever noticed a loss of compression during operating temperature? Chrome plating & piston surface intact? I'd also check the exhaust timing. Maybe somebody's installed the "sport" liner instead of the DF liner [:'(]
der_steuermann 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