HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Oct 23, 2012, 03:15 AM
Registered User
Croatia, Split-Dalmatia County, Split
Joined Apr 2012
114 Posts
Question
good throttle *servo for 20 cc gasser??

What do you guys think, analog or digital for a throttle servo on a zenoah g20????
romano_st is offline Find More Posts by romano_st
Reply With Quote
Sign up now
to remove ads between posts
Old Oct 23, 2012, 03:26 AM
Complete RC Idiot Savant
The Netherlands
Joined Nov 2009
2,643 Posts
I use Futaba S 3010.... crude, heavy duty servo's that withstand vibration pretty well. Cheap too. they are intended for control surfaces of big scale planes, but do OK here as well.

Brgds, Bert
Brutus1967 is online now Find More Posts by Brutus1967
Reply With Quote
Old Oct 23, 2012, 08:25 AM
WCB
Registered User
NC
Joined Aug 2005
1,044 Posts
analog
WCB is offline Find More Posts by WCB
Reply With Quote
Old Oct 24, 2012, 03:53 AM
Registered User
Croatia, Split-Dalmatia County, Split
Joined Apr 2012
114 Posts
thanks for reply, so you would use analog, reason why i ask is i have 4 futaba s3151- digital, i was thinking to use one as throttle servo......or maybe no, what is major downside of a digital on throttle?
romano_st is offline Find More Posts by romano_st
Reply With Quote
Old Oct 24, 2012, 05:59 AM
Registered User
jymz's Avatar
Delaware, Ohio
Joined Nov 2006
300 Posts
No downside to digital. Use what you have.
jymz is online now Find More Posts by jymz
Reply With Quote
Old Oct 24, 2012, 07:23 AM
Registered User
United States, MI, Waterford Charter Township
Joined Aug 2008
1,296 Posts
I use what I have as a rule too. Where I pay attention is the geometry, end point adjustments, and smooth interference free motion.
ahicks is online now Find More Posts by ahicks
Reply With Quote
Old Oct 24, 2012, 08:20 AM
Complete RC Idiot Savant
The Netherlands
Joined Nov 2009
2,643 Posts
The major downside would be unnecessary high power consumption

Which is no big deal, because it is not much anyway....

Still, I would use analog, because I would so for anything that does not require digital, just as a basic rule of thumb....

Brgds, Bert
Brutus1967 is online now Find More Posts by Brutus1967
Reply With Quote
Old Oct 24, 2012, 08:23 AM
WCB
Registered User
NC
Joined Aug 2005
1,044 Posts
Quote:
Originally Posted by WCB View Post
analog
I keep a couple of extra inexpensive standard analog servos just to use on throttle, but in a pinch I would do as suggested by the others...use what you have.
WCB is offline Find More Posts by WCB
Reply With Quote
Old Oct 25, 2012, 10:36 AM
Registered User
pilotpete2's Avatar
The Northeast Kingdom, Vermont
Joined Jun 2004
5,177 Posts
I've never bothered with a digital on throttle (I'm cheap), and would never use one with metal gears (too much slop), but if you have the S3151's sitting around, use them. On throttle, the difference in current draw between a digital and analog isn't worth worrying about.
Pete
pilotpete2 is online now Find More Posts by pilotpete2
Reply With Quote
Old Oct 26, 2012, 05:27 PM
Who Dat!
GeetarJoe's Avatar
United States, LA, New Orleans
Joined Sep 2011
650 Posts
the 3151 is a good choice but a little on the weak side as far as output goes. if you like to still use the throttle return spring you may find that the servo binds at full open.

i like to use the hitec HS-605. its definitely overkill in the torque dept for throttle, but the helical teeth on the output gear are very strong and resist vibration well.
GeetarJoe is offline Find More Posts by GeetarJoe
Reply With Quote
Old Oct 30, 2012, 05:16 AM
Registered User
South Africa, WC, Cape Town
Joined Dec 2009
1,402 Posts
A properly set up throttle servo won;t bind at full open with the throttle spring attached. the spring also offers negligable resistance to movement

I think the Futaba S3151 mentioned above is an ideal throttle servo. It has enough power and being digital will allow more fine control of the throttle plate. this would hold true for any good quality digital servo. I chose digital throttle servo's for these reasons.

An analogue like a S3010 r even a S3004 is also fine. Don't sweet the servo choice, just set it up well using the correct geometry and it will last the life of the plane.
TimBle is offline Find More Posts by TimBle
Reply With Quote
Old Oct 30, 2012, 07:16 AM
Registered User
rjstrickjr's Avatar
United States, NC, Faison
Joined Jan 2011
683 Posts
I have used what I had in the past but not anymore. JR Sport ST47BB is what I used alot till they kept breaking gears. I only use a JR821 or Hitec 5485 on throttle and choke from now on. I almost lost my H-9 P-47 twice before I switched over and i have had no problems. Yes it has a DLE20CC on it and it's awsome!
rjstrickjr is offline Find More Posts by rjstrickjr
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Found 15 cc Gasser SBP Aircraft - Fuel - Airplanes (FS/W) 0 Aug 28, 2012 12:33 PM
Discussion 30 cc gasser drankuraggarwal Fuel Plane Talk 5 Aug 14, 2012 08:30 AM
Wanted Looking for a DLE 20 cc douglasf30 Aircraft - Fuel - Engines and Accessories (FS/W) 1 Jul 31, 2012 07:50 PM
Question Which Servos for a Gasser? Fokker DII Giant Scale Airplanes 10 May 24, 2012 07:42 PM
Discussion 20 cc gasser on 64" Extra? fyrc22 Fuel Plane Talk 3 Jun 06, 2011 10:38 AM