Glow Engines Discuss RC glow engines

OS .50SX, what prop

Reply

Old 07-10-2018, 11:57 AM
  #1  
the Wasp
Thread Starter
My Feedback: (1)
 
Join Date: Sep 2003
Location: VT
Posts: 3,725
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default OS .50SX, what prop

so I have an OS Hyper .50 that I will be running on a Wold Models P-40, I have a GMS .47 muffler, the muffler is a bit big, it's just a bit longer and just a bit larger diameter than the stock OS .61 FX muffler (#E-4010), so I feel this combo will work out pretty much the way I want it to, I have a few jugs of 30% to burn in it

too add to all that , on the lathe I have cut down the fins on an older OS .50 SX Heli head (silver head) to use

so what props are/were you using on your OS.50SX plane engines ??, I thought I would start there

thanks guys !!, keep them flying

Jim
the Wasp is offline  
Reply With Quote
Old 07-11-2018, 01:59 AM
  #2  
Hobbsy
My Feedback: (101)
 
Hobbsy's Avatar
 
Join Date: Dec 2001
Location: Colonial Beach, VA
Posts: 19,414
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

OS Max 50SX

http://manuals.hobbico.com/osm/50sx-40-46-61-91fx-manual.pdf


11 x 6 to 11 x 10 Sport
12 x 7 to 12 x 9 Aerobatic.

Last edited by Hobbsy; 07-11-2018 at 02:04 AM.
Hobbsy is online now  
Reply With Quote
Old 07-11-2018, 10:33 AM
  #3  
the Wasp
Thread Starter
My Feedback: (1)
 
Join Date: Sep 2003
Location: VT
Posts: 3,725
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

thanks Dave, I didn't think to check out Scepter

Jim
the Wasp is offline  
Reply With Quote
Old 07-15-2018, 07:42 PM
  #4  
the Wasp
Thread Starter
My Feedback: (1)
 
Join Date: Sep 2003
Location: VT
Posts: 3,725
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Dave, in your Scepter link look at the plastic prop RPM numbers, compare props close to the same size, such as 11X7, 11X8 and 12X6,, the RPM numbers for those props are very interesting, as for the APC props alone in those sizes they are all within 250 RPM, I have not seen numbers that close on any other engine like that, I'm betting that engine's peak torque point is right around 11 grand

Jim

Last edited by the Wasp; 07-15-2018 at 07:46 PM.
the Wasp is offline  
Reply With Quote
Old 07-16-2018, 02:38 AM
  #5  
Hobbsy
My Feedback: (101)
 
Hobbsy's Avatar
 
Join Date: Dec 2001
Location: Colonial Beach, VA
Posts: 19,414
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

I think you're right on. That guy didn't do a torque curve like Clarence Lee usually does.

Last edited by Hobbsy; 07-16-2018 at 02:41 AM.
Hobbsy is online now  
Reply With Quote
Old 07-16-2018, 11:40 AM
  #6  
the Wasp
Thread Starter
My Feedback: (1)
 
Join Date: Sep 2003
Location: VT
Posts: 3,725
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

too bad they didn't test an APC 11X9, that would be interesting to see compared to the 12X6,

Jim
the Wasp is offline  
Reply With Quote
Old 07-23-2018, 03:54 PM
  #7  
blw
My Feedback: (3)
 
blw's Avatar
 
Join Date: Mar 2004
Location: Opelika, AL
Posts: 9,447
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

The real test is how the prop flies. Static ground tests don't give much information.
blw is offline  
Reply With Quote
Old 07-23-2018, 08:02 PM
  #8  
the Wasp
Thread Starter
My Feedback: (1)
 
Join Date: Sep 2003
Location: VT
Posts: 3,725
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Originally Posted by blw View Post
Static ground tests don't give much information.
it sure does,, if

A) you know your plane

B) you know what you want from your plane

C) if you know what you want from your prop

D) if you know your engine's performance and what RPM you want to run it at


Jim
the Wasp is offline  
Reply With Quote
Old 10-12-2018, 11:18 AM
  #9  
restlessrocks
 
Join Date: Nov 2003
Location: Lansing, NC
Posts: 14
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

I've been flying an OS 50sx on a hanger 9 twist 40 for several years. This plane has a very thick airfoil and for 3D type flying the APC 13x4W gives me the best results. I also use one of the old Tower Mufflers on it

Last edited by restlessrocks; 10-12-2018 at 11:23 AM. Reason: double post
restlessrocks 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