RC Radios, Transmitters, Receivers, Servos, gyros Discussion all about rc radios, transmitters, receivers, servos, etc.

Royal Servo

Reply

Old 04-25-2004, 08:54 AM
  #1  
themiracle18
Junior Member
Thread Starter
 
Join Date: Dec 2003
Location: , CA
Posts: 8
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Royal Servo

Hi all. I bought a used plane and it came with some "Royal" Servos. I have no idea what these servos are. They have black casing with no model number on them except for the brand name (I think) "Royal" and some maple leaf shape pattern. I really have no clue what these are as some of the gears need to be replaced. Can someone please help me? Thank you.
themiracle18 is offline  
Reply With Quote
Old 04-25-2004, 12:38 PM
  #2  
Rodney
Senior Member
 
Join Date: Dec 2001
Location: FL
Posts: 7,769
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Royal Servo

Back in the 50's and 60's these were quite prominent. I assume these are the three wire ones (they also made 4 wire servos then). If so, they are most probably set up so that 1.2milliseconds is the neautral pulse width and have a 4 sided spline. They will work with modern equipment but; at neautral input, the output wheel will not be at right angles to the servo axis. You can correct this by opening the servos, loosen the screw that hold the potentiometer in place, and rotating the pot untill the output wheel is at right angles to the servo case when inputing a 1.5 millisecond input pulse (the neautral pulse on most modern transmitters). Then just tighten down the screw holding the pot in place and reassemble. These old servos may have some problems with dirty potentiometers though, so, if you can, use newer servos on the main channels. Reserve these for throttle or flaps.
Rodney is offline  
Reply With Quote
Old 04-25-2004, 06:01 PM
  #3  
2 Piece
My Feedback: (8)
 
Join Date: Feb 2002
Location: Winchester, VA
Posts: 324
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Royal Servo

They may be Royal Products servos that were being sold mid 80's thru mid 90's. Could the maple leaf actually be a lion? Royal used a Leo Lion as their "symbol". These are OK servos, about 40oz output, have a splined output shaft and should work fine with the newer radio gear. However, it will probably be impossible to find replacement gear sets, Royal Products- unfortunately- very unfortunately- closed their doors about 5 years ago.
2 Piece
2 Piece is offline  
Reply With Quote
Old 04-28-2004, 08:58 PM
  #4  
themiracle18
Junior Member
Thread Starter
 
Join Date: Dec 2003
Location: , CA
Posts: 8
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Royal Servo

Thank you all for your replies. Well, I have no idea what those splines are. If you guys don't mind, can you give me a rough sketch of what they are for? And it seems like those servos are quite old (and so is the plane that they came with), I'm surprised that they still work. (Like my mom always says, old houses are more durable than new ones). And I guess 2 piece was right, that could've been a lion pattern. Sorry it's small so too hard to tell. I actually got two different sizes after taking a closer look. I'm guessing they are standard and mini by comparing their dimensions to modern servos. How could people tell what size and model these serovs were back then? Or maybe there were only a few manufacturers and servos kinds so people could easily tell?
themiracle18 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