 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
Flydad57(at)neo.rr.com
Guest
|
 Posted: Sat Jan 15, 2011 9:44 pm Post subject: model airplane servo |
 |
|
Thanks, Bob. That's some of the input that I am looking for. I would also like to hear about some successful installations and how they are controlled.
Bob Taylor
TigerCub N657RT
From: Robert L. Nuckolls, III (nuckolls.bob(at)aeroelectric.com)
Sent: Sunday, January 16, 2011 12:11 AM
To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)
Subject: Re: model airplane servo
| Quote: | On Sat, Jan 15, 2011 at 8:55 PM, Robert Taylor <Flydad57(at)neo.rr.com (Flydad57(at)neo.rr.com)> wrote:
--> AeroElectric-List message posted by: "Robert Taylor" <Flydad57(at)neo.rr.com (Flydad57(at)neo.rr.com)>
I am interested in the possibilities of using an R/C servo for the pitch trim on my TigerCub. Any and ALL details very welcomed! |
I know that there are many success stories that
cite the use of R/C servos for moving things on
airplanes. Just be aware that there ARE failure
modes in these little guys that can cause a fast
and total "hard over" motion to the mechanical
limits of the system.
I would not be able to get these products blessed
for use on TC aircraft without some very convincing
analysis and safeguards against such behaviors.
Having your trim system drive to a limit in
a few hundred milliseconds can really put some
excitement into an otherwise boring day.
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
========
[quote]
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
[b]
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
 |
dalamphere(at)comcast.net
Guest
|
| Posted: Sun Jan 16, 2011 6:18 am Post subject: model airplane servo |
|
|
What about using what I remember as retractable landing gear servos? They were slow and powerful and perhaps could be controlled by a 3-pos toggle switch. Please understand, I got out of RC 14yrs ago, so the current technology may be quite different. I think these servos were not proportional, just on/off, supply power polarity reversing.
Just momentarily move the toggle several times until you have the desired trim effect.
A caveat: I don't have one, nor any plans to use one so I have no stock in this, just contributing to the discussion.
Dave
[quote][b]
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
jcorner(at)shaw.ca
Guest
|
| Posted: Sun Jan 16, 2011 10:53 am Post subject: model airplane servo |
|
|
I agree with Bob's comments on this. I get around this problem by early testing to make sure that the "hard over failure" is easily controlled by manual override.
Since we are controlling a almost balanced airplane it does not take much servo deflection to correct minor trim or to control heading and altitude.
With this approach the "failure event" is similar but no more dramatic than hitting that invisible air pocket.
Pitch trim for landing for example is a separate system.
I have encountered that sustained "hard over" electrical failure of a servo but have found that when the power was switched off the servo will re-center itself
reducing the in-flight control loads, something that does not happen with other trim methods.
Jim
On 2011-01-15, at 10:41 PM, Robert Taylor wrote:
| Quote: | Thanks, Bob. That's some of the input that I am looking for. I would also like to hear about some successful installations and how they are controlled.
Bob Taylor
TigerCub N657RT
| Quote: | On Sat, Jan 15, 2011 at 8:55 PM, Robert Taylor <Flydad57(at)neo.rr.com (Flydad57(at)neo.rr.com)> wrote:
--> AeroElectric-List message posted by: "Robert Taylor" <Flydad57(at)neo.rr.com (Flydad57(at)neo.rr.com)>
I am interested in the possibilities of using an R/C servo for the pitch trim on my TigerCub. Any and ALL details very welcomed! |
I know that there are many success stories that
cite the use of R/C servos for moving things on
airplanes. Just be aware that there ARE failure
modes in these little guys that can cause a fast
and total "hard over" motion to the mechanical
limits of the system.
I would not be able to get these products blessed
for use on TC aircraft without some very convincing
analysis and safeguards against such behaviors.
Having your trim system drive to a limit in
a few hundred milliseconds can really put some
excitement into an otherwise boring day.
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
========
|
[quote][b]
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
nuckolls.bob(at)aeroelect
Guest
|
| Posted: Mon Jan 17, 2011 6:44 am Post subject: model airplane servo |
|
|
At 12:48 PM 1/16/2011, you wrote:
| Quote: | I agree with Bob's comments on this. I get around this problem by
early testing to make sure that the "hard over failure" is easily
controlled by manual override.
|
Good for you.
Nothing can replace the value of doing failure modes
effects analysis and/or demonstrations on a motor driven
flight control surface. See:
http://www.aeroelectric.com/articles/Trim_System_Failures.pdf
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
Flydad57(at)neo.rr.com
Guest
|
| Posted: Mon Jan 17, 2011 7:49 am Post subject: model airplane servo |
|
|
I'd add that, in my application, I have already done the hard over failure
analysis. My TigerCub is safely controllable with the trim tab at either
limit.
Bob Taylor
TigerCub N657RT
--------------------------------------------------
From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>
Sent: Monday, January 17, 2011 9:41 AM
To: <aeroelectric-list(at)matronics.com>
Subject: Re: model airplane servo
| Quote: |
<nuckolls.bob(at)aeroelectric.com>
At 12:48 PM 1/16/2011, you wrote:
>I agree with Bob's comments on this. I get around this problem by early
>testing to make sure that the "hard over failure" is easily controlled by
>manual override.
Good for you.
Nothing can replace the value of doing failure modes
effects analysis and/or demonstrations on a motor driven
flight control surface. See:
http://www.aeroelectric.com/articles/Trim_System_Failures.pdf
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
|
| Posted: Mon Jan 17, 2011 7:53 am Post subject: Re: model airplane servo |
|
|
It is amazing how many neat devices the "Nonman-carrying" quadrant of the flight universe comes up with.
For those looking for more powerful servos and other neat devices, Google:
Robot Zone or Servo City.
Here's a great example: "the Magic Box" http://www.circuitcellar.com/psoc2002/winners/297.pdf It's hard not to want one of these. Complete info is back up a \level.
I sell two distinctly different servo controllers: the EGPNMSC that drives Futaba and other servos, and the TSCMR, that turns the MAC/RAC "sort-of-servo" into a real servo. (Some glitch on my website is being worked on... so you might not be able to see them now).
The Ray Allen trim box is really a nice piece of hardware. For those who want to improve it a tiny bit, read the attached.
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
| Description: |
|
Download |
| Filename: |
TSCMR Installation Manual.pdf |
| Filesize: |
100.95 KB |
| Downloaded: |
424 Time(s) |
| Description: |
|
Download |
| Filename: |
EGPNMSC.pdf |
| Filesize: |
81.84 KB |
| Downloaded: |
602 Time(s) |
| Description: |
|
Download |
| Filename: |
RAC Trim and Trim Indicator Schematics.pdf |
| Filesize: |
16.84 KB |
| Downloaded: |
556 Time(s) |
_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
|
| Back to top |
|
|
user9253
Joined: 28 Mar 2008
Posts: 1938
Location: Riley TWP Michigan
|
| Posted: Wed Apr 06, 2011 6:17 am Post subject: Re: model airplane servo |
|
|
There is an article by Paul Dye on page 63 of the May 2011 issue of Kitplanes Magazine about using a Firgelli PQ12 linear actuator for aileron trim on an RV-3. The data sheet for this actuator is located here:
http://www.firgelli.com/pdf/PQ12_datasheet.pdf
It can be purchased here:
http://store.firgelli.com/pq12-linear-actuato12.html
It seems that it is available with either limit switches or a feedback pot but not both. Although the limit switch model does have an output that will light an LED when the limits are reached. Weight of the actuator is 15 grams.
Joe
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
_________________
Joe Gores |
|
| Back to top |
|
|
tim2542(at)sbcglobal.net
Guest
|
| Posted: Wed Apr 06, 2011 7:26 am Post subject: model airplane servo |
|
|
On 4/6/2011 7:17 AM, user9253 wrote:
| Quote: |
There is an article by Paul Dye on page 63 of the May 2011 issue of Kitplanes Magazine about using a Firgelli PQ12 linear actuator for aileron trim on an RV-3. The data sheet for this actuator is located here:
http://www.firgelli.com/pdf/PQ12_datasheet.pdf
It can be purchased here:
http://store.firgelli.com/pq12-linear-actuato12.html
It seems that it is available with either limit switches or a feedback pot but not both. Although the limit switch model does have an output that will light an LED when the limits are reached. Weight of the actuator is 15 grams.
Joe
--------
Joe Gores
Hi Joe; I'm using the Figelli L12-30-210-12-S actuator for the roll trim on my Cozy. Have not installed it yet, but it looks like it will do the job just fine although it looks a bit bigger than the one Paul used. It's small enough to mount in the wing root on my plane.http://www.firgelli.com/pdf/L12_datasheet.pdf
Tim Andres
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
sprocket(at)vx-aviation.c
Guest
|
| Posted: Wed Apr 06, 2011 8:15 am Post subject: model airplane servo |
|
|
I have a visit scheduled for tomorrow at the Firgelli facility. I have
developed a rudder trim system using one of their servos. I'm going to take
some pics and interview the principal of the company, with the aim of
productizing their devices for our market. I've learned a few things along
the way that may be useful for them.
Thanks
Vern Little
Vx Aviation
--
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
