Go Back  RCU Forums > Glow Engines, Gas Engines, Fuel & Mfg Support Forums > Everything Diesel
Reload this Page >

Straight Talk on the PAW .60 TBR R/C Diesel

Notices
Everything Diesel Discuss R/C Diesel engines here.

Straight Talk on the PAW .60 TBR R/C Diesel

Old 10-25-2015, 06:28 PM
  #51  
dkwflight
 
Join Date: Sep 2004
Location: Polk city, FL
Posts: 46
Likes: 0
Received 0 Likes on 0 Posts
Default

Hi

I wonder if your engine is fully broken in.
My PAW 49 needed a lot to fully break in.
It sounds like your engine might need more compression along with the proper needle adjustment..
Old 10-24-2017, 11:25 PM
  #52  
xzqzq
Junior Member
 
Join Date: Oct 2017
Posts: 1
Likes: 0
Received 0 Likes on 0 Posts
Default

Wonderful thread. Got interested in PAW . 60, diesel, even with no experience with diesels - never even seen one run in person. Glow fuel difficult to impossible to obtain where I live, but diesel fuel components available. Lower sound level appealing, electric having no appeal. Contemplating using .60 PAW diesel in a half or third scale version of Basic Ultralight Glider, powered biplane version. Have to drag out some NIB 1.5 diesels I have laying around, in addition to small glow engines - cox - that I'm thinking of perhaps using as diesels, and fire them up.
Old 10-25-2017, 04:26 AM
  #53  
Hobbsy
My Feedback: (102)
 
Hobbsy's Avatar
 
Join Date: Dec 2001
Location: Colonial Beach, VA
Posts: 20,370
Likes: 0
Received 24 Likes on 24 Posts
Default

OS LA .65 Bolly 13.5x8 DDD Plane Fuel===9,300
PAW .60 same Bolly 13.5x8 DDD Plane fuel===7,300

Here is the difference between an LA .65 conversion and a PAW .60 which Fiery now owns.
Attached Thumbnails Click image for larger version

Name:	Tr49349.jpg
Views:	73
Size:	53.8 KB
ID:	2242339   Click image for larger version

Name:	Tr50235.jpg
Views:	85
Size:	69.2 KB
ID:	2242340  

Last edited by Hobbsy; 10-25-2017 at 04:32 AM.
Old 10-25-2017, 04:52 AM
  #54  
controlliner
 
controlliner's Avatar
 
Join Date: Mar 2009
Location: Ontario, Canada
Posts: 1,238
Likes: 0
Received 1 Like on 1 Post
Default

The ABN LA 65 has a tighter piston fit, hence the better RPM than the PAW. larger throttle bore too?
Old 10-25-2017, 06:08 AM
  #55  
R/C Phile
Thread Starter
 
Join Date: Feb 2003
Location: Cumming, GA
Posts: 240
Likes: 0
Received 0 Likes on 0 Posts
Default

Whew! talk about resurrecting an old thread!

Hi guys, I think the tiny throttle bore on the Paw is a huge handicap. My next step was to fit a larger carb to but I have not gotten around to it in all these years. I still have the plane and engine an I recently decided to start flying my bigger planes again / go back to the club who knows? I might get inspired to try again.

Anyways: The carburetor's throttle bore is 5 mm which precisely matches the throttle bore on my Enya SS30BB.. It would seem there's a lot of room for improvement. Again, Paw has set it up for tremendous fuel economy and strong suction to alleviate the need for muffler pressure. They succeeded on the fuel economy front but not really on suction. It was a 10 minute deal to add a muffler pressure nipple and that significantly improved both throttle response and run consistency.

Mecoa (Model Engine Company Of America - MECOA HP RJL model airplane engine, engines for airplanes boats and cars) has a large selection of carbs at reasonable prices. That's where I would go to get a couple and try..

That's my 2 cents.
Old 10-25-2017, 03:15 PM
  #56  
fiery
My Feedback: (2)
 
Join Date: Feb 2002
Location: Hervey Bay Queensland, AUSTRALIA
Posts: 2,995
Likes: 0
Received 0 Likes on 0 Posts
Default

If you can find an Irvine .40 "Jetstream" carb, it works perfectly.

I put one for the Irvine .25 on my PAW .40 and was delighted.



Last edited by fiery; 10-25-2017 at 09:21 PM.
Old 11-23-2017, 06:19 AM
  #57  
controlliner
 
controlliner's Avatar
 
Join Date: Mar 2009
Location: Ontario, Canada
Posts: 1,238
Likes: 0
Received 1 Like on 1 Post
Default Question

Originally Posted by Hobbsy
Here is my Enya .25 Diesel turning a Graupner 12x5.

Also my Saito .80 on Davis ABC mix turning a Bolly 13.5x8, the early Saito .80 had a 15.5 to 1 compression ratio. No bad, I say
Hobbsy, did you modify the head on the Saito 80? I got my OS 56 FA running on home brew mix and I used the glow plug to start. It is finicky on the carb settings though.
Old 11-29-2017, 06:29 AM
  #58  
Hobbsy
My Feedback: (102)
 
Hobbsy's Avatar
 
Join Date: Dec 2001
Location: Colonial Beach, VA
Posts: 20,370
Likes: 0
Received 24 Likes on 24 Posts
Default

No sir, it has a 15.5 to 1 compression ratio stock, it fires right up with no coil in the plug.

http://sceptreflight.com/Model%20Eng...o%20FA-80.html Clarence Lee's test of the early Saito .80.

Last edited by Hobbsy; 11-29-2017 at 06:31 AM. Reason: Add link
Old 11-29-2017, 07:22 AM
  #59  
controlliner
 
controlliner's Avatar
 
Join Date: Mar 2009
Location: Ontario, Canada
Posts: 1,238
Likes: 0
Received 1 Like on 1 Post
Default

Nice, I may remove the head gasket in my .56 and see if it makes a difference. As of now it runs but sloppy (under compressed just a bit)
Old 11-29-2017, 07:33 AM
  #60  
Hobbsy
My Feedback: (102)
 
Hobbsy's Avatar
 
Join Date: Dec 2001
Location: Colonial Beach, VA
Posts: 20,370
Likes: 0
Received 24 Likes on 24 Posts
Default

A larger prop will help, lower rpm equals better cylinder filling therefore marginally higher compression pressure.
Old 11-29-2017, 07:54 AM
  #61  
R/C Phile
Thread Starter
 
Join Date: Feb 2003
Location: Cumming, GA
Posts: 240
Likes: 0
Received 0 Likes on 0 Posts
Default

After seeing your video I went out and found the Jetstream on a UK website (JustEngines) It's on its way. We'll see how it does. Thanks for the tip
Old 11-30-2017, 07:45 AM
  #62  
controlliner
 
controlliner's Avatar
 
Join Date: Mar 2009
Location: Ontario, Canada
Posts: 1,238
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by Hobbsy
A larger prop will help, lower rpm equals better cylinder filling therefore marginally higher compression pressure.
That explains why my PAW's and DC's run with a lower compression setting on a big screw. Nice honey colored oil in the exhaust too.
Old 11-30-2017, 07:59 AM
  #63  
Hobbsy
My Feedback: (102)
 
Hobbsy's Avatar
 
Join Date: Dec 2001
Location: Colonial Beach, VA
Posts: 20,370
Likes: 0
Received 24 Likes on 24 Posts
Default

Yep, a lot of people think about that backwards, they think a larger prop should require higher compression when the exact opposite is true. A larger prop equals slower, smoother idle too.
Old 12-11-2017, 11:52 AM
  #64  
Motorboy
 
Motorboy's Avatar
 
Join Date: Feb 2004
Location: Bergen, NORWAY
Posts: 2,234
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by controlliner
The ABN LA 65 has a tighter piston fit, hence the better RPM than the PAW. larger throttle bore too?
No, the timing and size of port is difference between OS LA 65 and PAW 60 TBR, also OS LA 65 has better timing and the larger ports to run at higher revolution.
Old 12-25-2017, 07:02 PM
  #65  
buzzard bait
 
Join Date: Jan 2003
Location: Ithaca, NY
Posts: 3,286
Likes: 0
Received 5 Likes on 5 Posts
Default

For me the big disappointment with PAW diesels is they are so long from back to thrust plate that they are hard to fit into the old rotary engine cowlings of WWI types, which is how I wanted to use them. Also I never quite got used to the smell and mess of my .40. They do sound wonderful, and I really miss that part. I still like smaller diesels.

Jim

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.