Running dual receiver set-ups in your giant scale?    Gallery
View related threads: (in this forum | in all forums)

Logged in as Guest



Users viewing this topic: none
    Search This Thread  
 
Printable Version

All Forums >> RC Airplanes >> Giant Scale Aircraft - General >> Running dual receiver set-ups in your giant scale?
Page: [1]

Tower Hobbies Get Coupon Codes Brands  
Login
Message << Older Topic   Newer Topic >>
Running dual receiver set-ups in your giant scale? - 10/19/2009 4:54 AM   
pgriffinifd@aol.com


 

Posts: 52
Score: 100
Joined: 4/11/2008
Last Login: 2/27/2013
From: Mountain Brook, AL, USA
Status: offline 		I've been very curious about this. I hear a lot, both pro and con. How many of you are running dual receivers in your giant scale airplanes? If so, why, and how do you have yours set up. If not, why not?. I personally think that if you have a multi-thousand dollar plane, it is good insurance, but some do not share this view. Their reasoning is failures are few & far between with modern radio gear. It complicates the set-up, adding more switches, batteries, and connections to fail, and other things. Well, Lets hear it, what do YOU think?

Phil Griffin....

Hide Signatures
       Post #: 1

RE: Running dual receiver set-ups in your giant scale? - 10/19/2009 6:18 AM   
Gremlin Castle


 

Posts: 1465
Score: 110
Joined: 2/9/2004
Last Login: 5/17/2013
From: Arlington, TX, USA
Status: offline 		There is no easy answer to the question and I am sure that you will get all kinds of answers to your question.
Here is how I have done it for the last 19 years of giant scale flying.
1. Use two batteries and two switches feeding a common receiver. Check both switches before each flight
2. Use a battery isolator if the total servo current draw exceeds the listed buss capacity of the receiver.
3. Take care that the receiver is isolated from vibration and is securely mounted.
4. Watch the antenna routing keeping it as far as possible from servo wiring and ignition components.
5. Use a reliable battery monitoring device before each flight.
6. Check the batteries at least twice a year for drops in capacity.
7. Don't use bargain batteries to power the receiver.
8. Mechanically secure all battery and switch connections and avoid silver plated connectors if at all possible in favor of gold plated ones.

This has worked for me in all types and sizes of giant scale planes. If you go to my gallery pictures you can see the range of planes that share the above listed techniques.

_____________________________

Up elevator is not always your friend.

Hide Signatures

(in reply to pgriffinifd@aol.com)
       Post #: 2

RE: Running dual receiver set-ups in your giant scale? - 10/19/2009 7:17 AM   
All Day Dan


 

Posts: 2894
Score: 151
Joined: 12/15/2002
Last Login: 5/21/2013
From: MANHATTAN BEACH, CA, USA
Status: offline 		Hi Phil, This is a hot topic. Here’s a point to consider. The most likely part of your radio system to fail is the transmitter. It has the highest component count, most solder joints, connectors, etc. The components, especially in the RF section, are running at an elevated temperature. It all adds up to a very high failure rate, much higher than anything in the model. Maybe there’s a reliability engineer listening to this thread that can add some good engineering sense to what I am generalizing. The two large IMAC planes that I have seen go in were both caused by transmitter failures and they both had a completely dual setup in the plane. Dan.

_____________________________

Dan

Hide Signatures

(in reply to pgriffinifd@aol.com)
       Post #: 3

RE: Running dual receiver set-ups in your giant scale? - 10/19/2009 7:28 AM   
sfaust



Posts: 1890
Score: 100
Joined: 9/6/2002
Last Login: 2/23/2013
From: Boston, MA, USA
Status: offline 		There is a lot of past history and topics that deal with this, and you might be best served to review those. Pros and cons on both sides, with lots of good information. FWIW, I used to run dual receivers, not so much for redundancy, but to reduce the high current demands on a single receiver. Now that there are receivers that are capable of handling the higher currents, I'm back to using a single receiver on my large airplanes. If you aren't using a receiver that has been crashed, the risk of a failure is very small. In fact, even in my turbine jet I ran a single receiver despite the high dollar value involved.

_____________________________

Stephen

Hide Signatures

(in reply to All Day Dan)
       Post #: 4

RE: Running dual receiver set-ups in your giant scale? - 10/19/2009 2:57 PM   
krayzc-RCU



Posts: 7402
Score: 104
Joined: 3/26/2002
Last Login: 5/22/2013
From: Kannapolis, NC, USA
Status: offline 		i have one 40% and one 46% one has dual one does not. I would do what u need to do to feel better while u r airborne.....

_____________________________

smooth as silk!

Hide Signatures

(in reply to sfaust)
       Post #: 5

RE: Running dual receiver set-ups in your giant scale? - 10/19/2009 7:55 PM   
Steve Percifield


 

Posts: 946
Score: 108
Joined: 2/19/2002
Last Login: 5/22/2013
From: Noblesville, IN, USA
Status: offline 		Like some one said above......many different answers. But I started using dual receivers for output ports rather than redundancy. When i started flying the larger birds that had 2/3 aileron servos, and 2/elevator servos, and 3 rudder servos, I ran out of ports on the receiver. Wyes weren't the answer because of voltage drop and amp draw, so we went with 2 receivers. One receiver would handle the left side, and one would handle the right side. You could now asign multiple outputs to the ailerons and evelator, etc and only have one servo in each output. Of course each receiver has it's own swtich and battery. I disagree with one above statement, the highest component failure rate goes to the switch and the battery in the airplane. Just remember, everything involved with flying RC can fail. Transmitter, receiver, battery, switch, servos, wires, etc. Even the 2.4 gig stuff is not fail proof. But, with the advent of power boxes, dual receivers are giving up to single receivers with the power box handling the additional ports and dual separate batteries, and they are capable of higher amp loads.

The least i would do is dual batteries as one gentleman discribed above. Just another battery and switch plugged into any unused receiver port. Then develope very good battery management habits. Also, I recommend using 5 cell/6 volt batteries. helps everything.

good luck
steve


_____________________________

Sir Percy
Hoosier Dawn Patrol

Hide Signatures

(in reply to krayzc-RCU)
       Post #: 6

RE: Running dual receiver set-ups in your giant scale? - 10/19/2009 9:08 PM   
hanko


 

Posts: 839
Score: 300
Joined: 7/27/2006
Last Login: 5/19/2013
From: , MI, USA
Status: offline 		Im all for the dual reiever,switch, battery set up. Ive used it for years, and it did save an airplane for me once. ( Switch took a ****). I agree 100% that most failures are battery or switch related.

Hide Signatures

(in reply to Steve Percifield)
       Post #: 7

RE: Running dual receiver set-ups in your giant scale? - 10/19/2009 9:30 PM   
Steve Percifield


 

Posts: 946
Score: 108
Joined: 2/19/2002
Last Login: 5/22/2013
From: Noblesville, IN, USA
Status: offline 		I also had the dual set up save my 35% Edge 540, when 1 rudder servo failed: it ran to one end and stalled, which over amped the battery on that receiver and fried the wiring,switch, battery, etc. The other receiver, which had the other side of the airplane and the second rudder servo, saved the airplane. But because the second rudder servo was fighting the stalled servo on the other receicer, they were linked together, it too over amped, and was very hot when i finally landed and checked everything. But, no doubt, the dual receivers saved the plane.


_____________________________

Sir Percy
Hoosier Dawn Patrol

Hide Signatures

(in reply to hanko)
       Post #: 8

RE: Running dual receiver set-ups in your giant scale? - 10/20/2009 2:24 AM   
sfaust



Posts: 1890
Score: 100
Joined: 9/6/2002
Last Login: 2/23/2013
From: Boston, MA, USA
Status: offline 		I also agree with the dual battery and switch setup, which is far more important in my opinion than running dual receivers. Anything I fly that's large enough to handle dual batteries is running that setup.

_____________________________

Stephen

Hide Signatures

(in reply to Steve Percifield)
       Post #: 9

RE: Running dual receiver set-ups in your giant scale? - 11/26/2009 8:24 AM   
daleflysrc


 

Posts: 208
Score: 110
Joined: 6/4/2002
Last Login: 5/19/2013
From: Alexander, AR, USA
Status: offline 		I fly both Giant Warbirds and Imacs and use both setups !! My warbirds use 2 switches and battery pacs into one RX. Non digital servos so I use 1800 to 2400 Mah. pacs Meister P-47, Scratch built P-63 King Kobra and a T.F. P-51. My 35% Aeroworks Extra 260 uses Two Rxs. Two 4500 Jr NiMihs. & two switches. I like the MPI charge switches. Allthough I have taken a couple appart and soldered the crimpped pins inside. I run digitals on my Imac and feel the dual Rx setup lowers the current demand on the Rx buss, also it gives me a redundancy as I cross wire the Airplane. I agree that the switch is the weakest link in our systems
&Gold plated connectors are a must !! The Connectors are also the weakest link as they cannot handle the higher amps I always use the same batterys and use a Sirrius charger !! both pacs peak about the same time and the voltages are almost identical when checked under a load. The only other thing I have thought about is a batt share just incase a cell was to short internally it would cut out that pack and keep the other pack from discharging. I dont like though that a batt share is constantly switching from one pac to another. I also use 22 gauge wires. I am old school and still like Nicads !! If it aint broke !! dont fix it !! Hope this helps Dale

Hide Signatures

(in reply to sfaust)
       Post #: 10

RE: Running dual receiver set-ups in your giant scale? - 11/26/2009 10:34 AM   
EloyM


 

Posts: 335
Score: 100
Joined: 8/5/2002
Last Login: 5/21/2013
From: Santa Ana, CA, USA
Status: offline 		I am not going to join the controversy, but I would like to provide a target for those that always like to have someone to blame:

Back in the days when we had magazines for real modelers, there was one called "Model Builder"! In 1983 I was Ass't Editor
there to Bill Northrop, not gone and not forgotten. At that time, I conceived the idea of dual receivers, installed same in
a large Telemaster and after extensive test flying including cutting off one side (one receiver) during a spin and recovering,
I published my findings in the MB April 1983 issue. First time puiblic, first time in print. Mea culpa - Eloy Marez

Oh yeah, the receivers were Orbit, AM, single conversion!

Hide Signatures

(in reply to daleflysrc)
       Post #: 11

RE: Running dual receiver set-ups in your giant scale? - 11/26/2009 5:46 PM   
hanko


 

Posts: 839
Score: 300
Joined: 7/27/2006
Last Login: 5/19/2013
From: , MI, USA
Status: offline 		And what is a real modeler?

Hide Signatures

(in reply to EloyM)
       Post #: 12

RE: Running dual receiver set-ups in your giant scale? - 12/4/2009 7:47 AM   
snuts


 

Posts: 513
Score: 100
Joined: 12/2/2008
Last Login: 5/21/2013
From: camrose alberta, AB, CANADA
Status: offline
quote:

ORIGINAL: hanko

And what is a real modeler?


Now there is a hole new can of worms! Ha-Ha.
-Snuts-
I'm a dual Batt/Switch, one receiver guy.

Hide Signatures

(in reply to hanko)
       Post #: 13

RE: Running dual receiver set-ups in your giant scale? - 12/11/2012 10:40 PM   
georch


 

Posts: 15
Score: 100
Joined: 7/28/2012
Last Login: 5/12/2013
From: Barcelona Catalunya, SPAIN
Status: offline 		Hi guys,
I am thinking of installing dual receivers in my 2m de havilland vampire turbine.
I am not sure how to set it up. The radio would be a futaba T8FG super. The plane has dual rudders and the elevator split in two.
My plan si to connect as follows:

Rcv#1:
Left aileron
RH elevator half
RH rudder
Gas 
Landing Gear
Rcv#2

Right aileron
LH elevator half
LH rudder
Flaps

Of course one battery per receiver.
How do I configure this in the radio? Is it possible?

Thanks!!!



Hide Signatures

(in reply to snuts)
       Post #: 14

RE: Running dual receiver set-ups in your giant scale? - 12/11/2012 11:17 PM   
pappa2victor


 

Posts: 8
Score: 100
Joined: 9/20/2006
Last Login: 5/19/2013
From: Douglasville, GA, USA
Status: offline 		Georch-
I agree with you, that is how my Ziroli Skyraider is set up on a 7 ch radio. There is nothing to change on the Tx, it will control both Rxs as if they are one. I wouldn't split something like throttles on a twin or flaps but you seem to have that figured out. It seems to me that two parallel devices are better than one that can fail both batteries.

Hide Signatures

(in reply to georch)
       Post #: 15

RE: Running dual receiver set-ups in your giant scale? - 12/12/2012 6:47 AM   
dadragon


 

Posts: 342
Score: 112
Joined: 12/20/2008
Last Login: 3/14/2013
From: pine bluffs, WY, USA
Status: offline 		Georch;I also agree;I am using duals in my 1/4 scale Ziroli Skyraider and I would not change that set up for anything.George.

Hide Signatures

(in reply to pappa2victor)
       Post #: 16

RE: Running dual receiver set-ups in your giant scale? - 12/12/2012 11:44 AM   
sensei



Posts: 1502
Score: 176
Joined: 7/16/2002
Last Login: 5/22/2013
From: SAN ANTONIO, TX, USA
Status: offline
quote:

ORIGINAL: EloyM

I am not going to join the controversy, but I would like to provide a target for those that always like to have someone to blame:

Back in the days when we had magazines for real modelers, there was one called ''Model Builder''! In 1983 I was Ass't Editor
there to Bill Northrop, not gone and not forgotten. At that time, I conceived the idea of dual receivers, installed same in
a large Telemaster and after extensive test flying including cutting off one side (one receiver) during a spin and recovering,
I published my findings in the MB April 1983 issue. First time puiblic, first time in print. Mea culpa - Eloy Marez

Oh yeah, the receivers were Orbit, AM, single conversion!


Well I guess that makes you a real modeler as well as a bitter O/F...

Now that that is out of the way, if you want the redundancy then go ahead and run two receivers placing at least one elevator and aileron impute on each receiver because those are the two primary flight controls that with save your airplane, then for good measure split the rudder and engine. I did this vary thing for years, but to be honest I have been running a single receiver in all my stuff including 50% and larger for a long time now. So as somebody else already stated; do what you feel good about.

Bob

_____________________________

Fly It Like You Stole It!!!

Hide Signatures

(in reply to EloyM)
       Post #: 17

RE: Running dual receiver set-ups in your giant scale? - 12/13/2012 12:23 AM   
dadragon


 

Posts: 342
Score: 112
Joined: 12/20/2008
Last Login: 3/14/2013
From: pine bluffs, WY, USA
Status: offline 		Georch;I forgot to mention I am using a weatronic 12-20R-72 mhz dual receiver and these guys cost about 4 times as much a futaba pcm.I bought mine when I was still working and not retired.

Hide Signatures

(in reply to sensei)
       Post #: 18

Page:   [1]
All Forums >> RC Airplanes >> Giant Scale Aircraft - General >> Running dual receiver set-ups in your giant scale?
Page: [1]





Jump to:


 
Google 



Search | Marketplace | Event Calendar | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

Photo Gallery | Instructor Search | Field|Track|Marina Search

Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

SITE MAP!   : :   FORUM RULES

RC Universe is a service of Internet Brands, Inc. Copyright © 2001-2013.

Charities we support that also need your help
Yorkie Rescue | Humane Society | ASPCA | Crohn's-Colitis America


0.797RCU1