Pul-Pull vs Tail Mounted Servos - RCCanada - Canada Radio Controlled Hobby Forum
RCCanada - Canada's Radio Control Hobby Forum
Construction Ideas, Hints and Tips For all the builders out there. Ask questions, make suggestions, trade tips.

Closed Thread
Thread Tools Display Modes
Old 09-05-2003, 05:55 PM   #1
scaleguy's Avatar
I am: JimmyD
Join Date: Nov 2002
Location: Mississauga On, SE Zone
Radio of choice:
JETI Duplex DS-16
# of RCs: 6

Feedback: 30 / 100%
Posts: 13,957
Total Props: 16
Pul-Pull vs Tail Mounted Servos

       Remove this ad - become a site supporter!
Ok what are your opinions on a closed loop control system like a Pull-Pull Rudder or Elevatore vs mounting the servo(s) right at the tail and using short pushrods?

Lets hear them!
Jim Daly
IMAC Sequence Committee Member
Your Friendly Neighborhood SouthEast Zone Director
MAAC #14323L IMAC #3678
scaleguy is offline   Quick reply to this message.

Sponsored Links - Subscribe to remove this ad.
Old 09-05-2003, 06:20 PM   #2
Gary Maker
RCC Supreme Contributor
I am: Gary M.
Join Date: Jul 2003
Location: Stoney Creek, Ontario
Radio of choice:
Spektrum DX8
# of RCs: 7

Feedback: 25 / 100%
Posts: 7,331
Total Props: 9
I think the biggest advantage to the pull pull elevator system is weight at the tail of the plane. I assembled a DP Extra 330L for a friend and he wanted to keep it simple so said to use the dual elevator servos. Then to get the proper balance he had to add 1.5 lbs of lead to the nose. The plane was sluggish especially on the verticals. Back to the shop, pull the servos and install the pull pull. The plane handled amazingly different as he not only eliminated the weight of one servo but was able to take 1.25 lbs of the lead from the nose. Thats a lot of weight for that size plane!

On the other hand, I would think if the plane is deisgned for two servos in the tail, by going to a pull pull elevator system then you face the opposite situation. Unless you were able to get the same power from a lighter engine you'd have to put weight in the tail to get it on the CG. JMHO
Stoney Creek Hawks RC
MAAC No. 43659

Radios used: Spektrum DX6i
Current builds: 1/4 scale J3 Cub & Neiuport 17 and KMP B-25.
Currently flying: Scratched Tele 40, Parkzone Stryker & 60" SPAD Debonaire


"Time flies like an arrow - fruit flys like a banana." Groucho Marks
Gary Maker is offline   Quick reply to this message.
Old 09-05-2003, 07:36 PM   #3
RCC Supreme Contributor
AJCoholic's Avatar
I am: Andrew Coholic
Join Date: Sep 2002
Location: Timmins, Northern Ontario
Radio of choice:
JR 12X

Feedback: 5 / 100%
Posts: 9,873
Total Props: 1
tail mounted servos offer a simple installation, simple likages and easy to inspect. disadvantage of weight like stated and also long servo leads.

pull pull is more work to set up to work effectively (mainly harder to keep both lines taught at all throws) and obviously more difficult to install and inspect, but offers a super control system when set up correctly.

Both work great when done right. I think on a larger plane, tail mounted servos are probably easier and as long as you dont need to add nose weight are what I would choose.

I have done it both ways, and also used forward mounted servos with the HEAVY duty Sullivan pushrods, or carbon arrowshaft pushrods to the elevator surfaces, on two planes, with pull pull for the rudder.
Andrew Coholic -MAAC #26287L

1/2A to giant scale, IMAC, SAM, R/C sport, turbine jets, Heli's...
if its got a wing or two and an engine - I like it!
AJCoholic is offline   Quick reply to this message.
Closed Thread

Quick Reply

Register Now

In order to be able to post messages on the RCCanada - Canada Radio Controlled Hobby Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Member names may only be composed of alpha-numeric characters. (A-Z and 0-9)

!!ATTENTION ADVERTISERS!! If you intend on advertising anything on this forum, whatsoever, you are required to first contact us here . Additionally, we do NOT allow BUSINESS NAMES unless you are an Authorized Vendor. If you own a business, and want to do sales on this site via posting or private message, you will need to follow the rules. Shops, Stores, Distributors, Group Buys without being authorized will see your account terminated.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Your Name
Your first name and last initial is required if you plan on using the forum.
Which city & province you live in. This is mandatory for classified listings.
Radio of choice?
Which radio is your current favorite to use?
Number of RC Vehicles?
How many boats, cars, planes do you own?


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
vBulletin Message

Thread Tools
Display Modes

Forum Jump

All times are GMT -5. The time now is 05:25 PM.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.