Today's Message Index:
----------------------
1. 06:33 AM - Squaring shear in KC area (Robert L. Nuckolls, III)
2. 07:48 AM - Re: model airplane servo (user9253)
3. 09:05 AM - Re: Re: model airplane servo (Robert L. Nuckolls, III)
4. 10:12 AM - Re: model airplane servo (Jim Corner)
5. 11:12 AM - RCT3 crimper et al (Fergus Kyle)
6. 11:14 AM - Trim device (paul wilson)
7. 11:55 AM - Mounting a d-sub connector to a bulkhead as a pass-through (jhclarkfl)
8. 02:37 PM - Re: model airplane servo (Joe Dubner)
9. 03:04 PM - Re: model airplane servo (user9253)
10. 03:45 PM - Re: Transponder antenna signal (rparigor@suffolk.lib.ny.us)
11. 04:36 PM - Re: Transponder antenna signal (Bill Watson)
12. 05:43 PM - Re: model airplane servo (Jim Corner)
13. 06:01 PM - Re: model airplane servo (Robert Taylor)
14. 06:51 PM - Re: model airplane servo (Jared Yates)
15. 07:09 PM - Re: Transponder antenna signal (Bill Boyd)
16. 07:51 PM - Re: Transponder antenna signal (Jared Yates)
17. 08:00 PM - Re: Transponder antenna signal (BobsV35B@aol.com)
18. 08:20 PM - Re: Mounting a d-sub connector to a bulkhead as a pass-through (Robert L. Nuckolls, III)
19. 09:16 PM - Re: model airplane servo (Robert L. Nuckolls, III)
20. 09:44 PM - Re: model airplane servo (Robert Taylor)
Message 1
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| Subject: | Squaring shear in KC area |
A good friend of mine is trimming down his
shop. He's got a really nice squaring shear
for sale
<http://kansascity.craigslist.org/tls/2158343501.html>http://kansascity.craigslist.org/tls/2158343501.html
Obviously, this is not something you ship
by UPS. But readers within practical driving
distance might be interested.
Bob . . .
no not archive
Message 2
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| Subject: | Re: model airplane servo |
Thanks to Bob and others for the replies and suggestions.
> It's not likely that you would have any luck mounting the trim
> tab on the wing tip itself (it's been tried by others; there just isn't
> enough aerodynamic authority unless the tab is almost as big as the
> aileron).
That is exactly what I had planned to do. Thanks for the warning, Charlie. Sometimes
I get obsessed with details and neglect to stand back and look at the
feasibility of the whole project. I do not want to add a trim tab to the ailerons
because I am afraid of causing flutter. So I had intended to mount a trim
tab on the wing tip. Since it has been tried by others without success, I could
be wasting my time and money if installing wing tip trim tabs.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=327107#327107
Message 3
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| Subject: | Re: model airplane servo |
> > It's not likely that you would have any luck mounting the trim
> > tab on the wing tip itself (it's been tried by others; there just isn't
> > enough aerodynamic authority unless the tab is almost as big as the
> > aileron).
>
>That is exactly what I had planned to do. Thanks for the warning,
>Charlie. Sometimes I get obsessed with details and neglect to stand
>back and look at the feasibility of the whole project. I do not
>want to add a trim tab to the ailerons because I am afraid of
>causing flutter. So I had intended to mount a trim tab on the wing
>tip. Since it has been tried by others without success, I could be
>wasting my time and money if installing wing tip trim tabs.
It's an easy experiment to explore. Use some speed tape
to stick a fixed sheet metal tab on the trailing edge
of the tip. Size it to some value you think might be
tolerable from the perspective of appearance and practical
implementation. Go fly and see how much trim authority
you're having to offset in the stick.
Keep in mind that you're wanting to trim out small
operational variations in roll trim. This isn't
an autopilot design project with a goal of exerting
the same authority in roll as the pilot, you're
wanting to offset relatively small trim offsets
due to loading and fuel distribution.
The Zodiac avoids aileron flutter issues by trimming
with a separate mini-aileron.
Emacs!
Other pictures of aileron trim tabs seem to illustrate
relatively small mechanisms
Emacs!
Emacs!
Also consider an actuator driven spring cartridge rigged
to the aileron controls under the floor boards. This
technique has been used by many designers with
success. You can develop your own design goals.
Bob . . .
Message 4
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| Subject: | Re: model airplane servo |
I have been successfully using model aircraft servos for several years, first on
a Kitfox 2 and more recently on a Model 5.
Initially started with rudder only trim, graduating to full three axis trim control
using a microcontroller Motorola MC68HC08 to operate the servos.
This was expanded several years ago to include GPS route tracking. More recently
altitude hold. This autopilot design is still being developed, and refined.
For trim only the R/C servo will tracks the potentiometer position, and is constantly
powered to maintain its position.
Satisfactory R/C servo controllers for trim only can cost less than $20, servos
$40. and a power supply for 5-6 volts at 5 amps < $20.
I have found these servos to be quite durable with one servo on my Kitfox 2 (Hitec
805BB) lasting over 500 hrs flying, a similar servo on the 5 now has 150 +
hours.
I could go on forever, but will wait to see if there is further interest. Meanwhile
I suspect there will be a few questions.
Jim
On 2011-01-14, at 7:56 AM, user9253 wrote:
>
> I want to install electric aileron trim. I could buy a Ray Allen servo and control
its speed with PWM. I was wondering if there are any other options that
might be lighter weight or smaller. Has anyone had experience with linear actuators
or model airplane R/C servos? Do the RC model servos hold their position
when power is removed? The ideal 12vdc servo would be slow moving and would
be operated by a switch without electronic controls. It should also have
built-in limit switches and a position feedback pot. Maybe the Ray Allen is the
best.
> Thanks, Joe
>
> --------
> Joe Gores
>
Message 5
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| Subject: | RCT3 crimper et al |
Cheers,
I wrote this week at an inability to understand how the subject
crimper worked, and probably caused some heads to nod, including Bob's, over
what must have seemed a simple problem.
It was. The way I used the crimper, it was impossible to insert a
pin/socket and wire in order to crimp same. Thanks to those who replied, I
discovered the fault:
Inside a threaded cap at the back, is a formed spring-loaded spindle. One
end of it is solid, the other is hollowed out. I found mine reversed, turned
it 'round and voila, the pin/socket slides into the hollow just far enough
to crimp it solidly to the wire.
No wonder I couldn't slide the target into place....... As Major
Hoople says, "Egad!".
Apologies to all who mused over my stupidity.
Best for 2011,
Ferg
Message 6
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http://www.sabermfg.com/trim.htm
Pretty sure this is the one I purchased without the indicator. Simple
stepper motor and a switch and some wire. Small flap that does not
over control the aileron at full deflection
And
http://www.aeroresourcesinc.com/store_/index.php/cPath/77
Paul
Message 7
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| Subject: | Mounting a d-sub connector to a bulkhead as a pass-through |
I will be using a d-sub connector on my removable rear Infinity Stick Grip. One
of the connectors will be secured to the covering I will be fabricating to close
off the floor opening around the aft stick. My problem is that I am not
familiar with a means of securing one connector in this panel and yet still be
able to screw in the other half of the connection onto the panel mounted connector.
Any suggestions and sources for the means of accomplishing this task?
Thanks,
Jack
--------
Jack Clark
RV-8A Fuselage
http://www.mykitlog.com/jackclark/
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=327130#327130
Message 8
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| Subject: | Re: model airplane servo |
Jim Corner wrote:
>
> I have been successfully using model aircraft servos for several years ...
[snip]
> I could go on forever, but will wait to see if there is further interest. Meanwhile
I suspect there will be a few questions.
Jim,
I'm happy to see someone (else) proving the naysayers wrong. This has
been a pet project of mine for almost as long as you and I've taken a
similar approach using a different controller (ATmega8). I'm even using
a $18 servo to change the position of one of my landing lights for taxi.
Question, please: where have you found for a source of bellcrank,
clevis, threaded rod and other hardware? I'd like to find some 10-32
but all the model airplane stuff I've found is pretty wimpy (4-40 or
6-32 at best). On my landing light the RC stuff is OK but I'd like an
"aviation grade" mechanical coupling for the elevator and aileron trim
on my RV.
--
Joe
Independence, OR
http://www.mail2600.com/position
http://www.mail2600.com/cgi-bin/webcam.cgi
Message 9
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| Subject: | Re: model airplane servo |
> It's an easy experiment to explore. Use some speed tape
> to stick a fixed sheet metal tab on the trailing edge
> of the tip. Size it to some value you think might be
> tolerable from the perspective of appearance and practical
> implementation. Go fly and see how much trim authority
> you're having to offset in the stick.
That is a very good idea, Bob. I should have thought of that because I did the
same thing on the rudder. The runway is covered with snow, so I will have to
wait before experimenting in the air.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=327143#327143
Message 10
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| Subject: | Re: Transponder antenna signal |
Hi Stan
<< streamline my transponder antenna... streamlining
with a fiberglass
> covering will not affect signal performance.
>>
I am using an AAE transponder antenna in my plastic
Europa. AAE says if you are installing it on the side of a plastic
aeroplane that you must stand the antenna off with a supplied piece of
Balsa. You could contact them and ask why. I thinkI did and it was
perhaps electrostatic build up?
Ron Parigoris
Message 11
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| Subject: | Re: Transponder antenna signal |
I like that.
You've been watching:
http://www.youtube.com/watch?v=ftq8jTQ8ANE
(excuse me if I'm being circular here)
Bill "need something to do until it warms up" Watson
On 1/14/2011 11:41 PM, Speedy11@aol.com wrote:
> Bob - or other antenna gurus,
> I want to streamline my transponder antenna. I have the short (3
> inch) stub antenna with the ball on the tip. To streamline it I'm
> going to make an epoxy resin fiberglass covering that will look like a
> blade antenna.
> Please confirm for me that streamlining with a fiberglass covering
> will not affect signal performance.
> Thanks,
> Stan Sutterfield
>
Message 12
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| Subject: | Re: model airplane servo |
Joe
I'm using hardware designed for giant scale RC. The bolts are 8-32 and
the push rods are 6 gauge rods. Your speeds are higher than mine, but
remember that you require less deflection for the same result. Also we
are trimming aerodynamically balanced surfaces and the air load on the
trim tabs are a lot less than most expect. I have attached a photo of
my flaperon servo installation. It is very effective and can induce a
very high roll rate.
Jim
>
> I'm happy to see someone (else) proving the naysayers wrong. This has
been a pet project of mine for almost as long as you and I've taken a
similar approach using a different controller (ATmega8). I'm even using
a $18 servo to change the position of one of my landing lights for taxi.
>
> Question, please: where have you found for a source of bellcrank,
clevis, threaded rod and other hardware? I'd like to find some 10-32
but all the model airplane stuff I've found is pretty wimpy (4-40 or
6-32 at best). On my landing light the RC stuff is OK but I'd like an
"aviation grade" mechanical coupling for the elevator and aileron trim
on my RV.
>
> --
> Joe
> Independence, OR
Message 13
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| Subject: | Re: model airplane servo |
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!
Thanks for any info.
Bob Taylor
TigerCub N657RT
--------------------------------------------------
From: "Jim Corner" <jcorner@shaw.ca>
Sent: Saturday, January 15, 2011 1:08 PM
Subject: Re: AeroElectric-List: model airplane servo
>
> I have been successfully using model aircraft servos for several years,
> first on a Kitfox 2 and more recently on a Model 5.
>
> Initially started with rudder only trim, graduating to full three axis
> trim control using a microcontroller Motorola MC68HC08 to operate the
> servos.
>
> This was expanded several years ago to include GPS route tracking. More
> recently altitude hold. This autopilot design is still being developed,
> and refined.
>
> For trim only the R/C servo will tracks the potentiometer position, and
> is constantly powered to maintain its position.
>
> Satisfactory R/C servo controllers for trim only can cost less than $20,
> servos $40. and a power supply for 5-6 volts at 5 amps < $20.
>
> I have found these servos to be quite durable with one servo on my Kitfox
> 2 (Hitec 805BB) lasting over 500 hrs flying, a similar servo on the 5 now
> has 150 + hours.
>
> I could go on forever, but will wait to see if there is further interest.
> Meanwhile I suspect there will be a few questions.
>
> Jim
>
>
> On 2011-01-14, at 7:56 AM, user9253 wrote:
>
>> <fran4sew@banyanol.com>
>>
>> I want to install electric aileron trim. I could buy a Ray Allen servo
>> and control its speed with PWM. I was wondering if there are any other
>> options that might be lighter weight or smaller. Has anyone had
>> experience with linear actuators or model airplane R/C servos? Do the RC
>> model servos hold their position when power is removed? The ideal 12vdc
>> servo would be slow moving and would be operated by a switch without
>> electronic controls. It should also have built-in limit switches and a
>> position feedback pot. Maybe the Ray Allen is the best.
>> Thanks, Joe
>>
>> --------
>> Joe Gores
>>
>
>
>
Message 14
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| Subject: | Re: model airplane servo |
Look at the model helicopter suppliers too. Like this one:
http://www.ronlund.com/mm5/merchant.mvc?Screen=PROD&Store_Code=RHPS&Product_Code=RCHCR&Category_Code
<http://www.ronlund.com/mm5/merchant.mvc?Screen=PROD&Store_Code=RHPS&Product_Code=RCHCR&Category_Code=>It's
a hollow carbon fiber shaft with titanium threads and an aluminum ferrule.
For stiffness, weight, and strength, it might be something to consider.
On Sat, Jan 15, 2011 at 8:55 PM, Robert Taylor <Flydad57@neo.rr.com> wrote:
> Flydad57@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!
>
> Thanks for any info.
>
> Bob Taylor
> TigerCub N657RT
>
> --------------------------------------------------
> From: "Jim Corner" <jcorner@shaw.ca>
> Sent: Saturday, January 15, 2011 1:08 PM
> To: <aeroelectric-list@matronics.com>
> Subject: Re: AeroElectric-List: model airplane servo
>
>>
>> I have been successfully using model aircraft servos for several years,
>> first on a Kitfox 2 and more recently on a Model 5.
>>
>> Initially started with rudder only trim, graduating to full three axis
>> trim control using a microcontroller Motorola MC68HC08 to operate the
>> servos.
>>
>> This was expanded several years ago to include GPS route tracking. More
>> recently altitude hold. This autopilot design is still being developed, and
>> refined.
>>
>> For trim only the R/C servo will tracks the potentiometer position, and
>> is constantly powered to maintain its position.
>>
>> Satisfactory R/C servo controllers for trim only can cost less than $20,
>> servos $40. and a power supply for 5-6 volts at 5 amps < $20.
>>
>> I have found these servos to be quite durable with one servo on my Kitfox
>> 2 (Hitec 805BB) lasting over 500 hrs flying, a similar servo on the 5 now
>> has 150 + hours.
>>
>>
>> I could go on forever, but will wait to see if there is further interest.
>> Meanwhile I suspect there will be a few questions.
>>
>> Jim
>>
>>
>>
>>
>>
>> On 2011-01-14, at 7:56 AM, user9253 wrote:
>>
>>> fran4sew@banyanol.com>
>>>
>>> I want to install electric aileron trim. I could buy a Ray Allen servo
>>> and control its speed with PWM. I was wondering if there are any other
>>> options that might be lighter weight or smaller. Has anyone had experience
>>> with linear actuators or model airplane R/C servos? Do the RC model servos
>>> hold their position when power is removed? The ideal 12vdc servo would be
>>> slow moving and would be operated by a switch without electronic controls.
>>> It should also have built-in limit switches and a position feedback pot.
>>> Maybe the Ray Allen is the best.
>>> Thanks, Joe
>>>
>>> --------
>>> Joe Gores
>>>
>>>
>>
>>
>>
>>
>>
>>
>
>
Message 15
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| Subject: | Re: Transponder antenna signal |
I built just such a radome for my XPDR antenna and it worked fine, until a
bit of oil collected in it from the belly - that was a different story. I
think it attenuated the signal quite a bit, but I later found I was having
other issues with my XPDR tray coax fitting that overshadowed any oil
contamination problem inside the radome.
I must say: while it was a fun exercise in making molds and casting a
fiberglass part, it did nothing noticeable for my top speed.
Bill B
RV-6A
On Sat, Jan 15, 2011 at 7:30 PM, Bill Watson <Mauledriver@nc.rr.com> wrote:
> I like that.
>
> You've been watching:
> http://www.youtube.com/watch?v=ftq8jTQ8ANE
> (excuse me if I'm being circular here)
>
> Bill "need something to do until it warms up" Watson
>
>
> On 1/14/2011 11:41 PM, Speedy11@aol.com wrote:
>
> Bob - or other antenna gurus,
> I want to streamline my transponder antenna. I have the short (3 inch)
> stub antenna with the ball on the tip. To streamline it I'm going to make
> an epoxy resin fiberglass covering that will look like a blade antenna.
> Please confirm for me that streamlining with a fiberglass covering will not
> affect signal performance.
> Thanks,
> Stan Sutterfield
>
>
> *
>
> *
>
>
Message 16
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| Subject: | Re: Transponder antenna signal |
Stan, One of my local chapter members found a shark-fin style unit on ebay
for less than $20 shipped. He stripped the paint off and found it to be
made of what appeared to be mostly solid aluminum, so he repainted it and
installed it. You might be able to find something similar, unless you are
wanting to enjoy the sport of building up some foam or balsa and coating it
with light fiberglass cloth and such.
On Sat, Jan 15, 2011 at 10:05 PM, Bill Boyd <sportav8r@gmail.com> wrote:
> I built just such a radome for my XPDR antenna and it worked fine, until a
> bit of oil collected in it from the belly - that was a different story. I
> think it attenuated the signal quite a bit, but I later found I was having
> other issues with my XPDR tray coax fitting that overshadowed any oil
> contamination problem inside the radome.
>
> I must say: while it was a fun exercise in making molds and casting a
> fiberglass part, it did nothing noticeable for my top speed.
>
> Bill B
> RV-6A
>
> On Sat, Jan 15, 2011 at 7:30 PM, Bill Watson <Mauledriver@nc.rr.com>wrote:
>
>> I like that.
>>
>> You've been watching:
>> http://www.youtube.com/watch?v=ftq8jTQ8ANE
>> (excuse me if I'm being circular here)
>>
>> Bill "need something to do until it warms up" Watson
>>
>>
>> On 1/14/2011 11:41 PM, Speedy11@aol.com wrote:
>>
>> Bob - or other antenna gurus,
>> I want to streamline my transponder antenna. I have the short (3 inch)
>> stub antenna with the ball on the tip. To streamline it I'm going to make
>> an epoxy resin fiberglass covering that will look like a blade antenna.
>> Please confirm for me that streamlining with a fiberglass covering will
>> not affect signal performance.
>> Thanks,
>> Stan Sutterfield
>>
>>
>> *
>>
>> ist" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
>> tp://forums.matronics.com
>> _blank">http://www.matronics.com/contribution
>> *
>>
>>
> *
>
> *
>
>
Message 17
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| Subject: | Re: Transponder antenna signal |
Good Evening Bill B.
I always install the little blade antennas because I have broken so many of
the little "wire with a ball" style either when washing the belly or just
rolling around under the airplane on a creeper.
Happy Skies,
Old Bob
LL22
Stearman N3977A
In a message dated 1/15/2011 9:10:23 P.M. Central Standard Time,
sportav8r@gmail.com writes:
I built just such a radome for my XPDR antenna and it worked fine, until a
bit of oil collected in it from the belly - that was a different story. I
think it attenuated the signal quite a bit, but I later found I was having
other issues with my XPDR tray coax fitting that overshadowed any oil
contamination problem inside the radome.
I must say: while it was a fun exercise in making molds and casting a
fiberglass part, it did nothing noticeable for my top speed.
Bill B
RV-6A
Message 18
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| Subject: | Re: Mounting a d-sub connector to a bulkhead as a |
pass-through
At 01:52 PM 1/15/2011, you wrote:
>
>I will be using a d-sub connector on my removable rear Infinity
>Stick Grip. One of the connectors will be secured to the covering I
>will be fabricating to close off the floor opening around the aft
>stick. My problem is that I am not familiar with a means of
>securing one connector in this panel and yet still be able to screw
>in the other half of the connection onto the panel mounted
>connector. Any suggestions and sources for the means of
>accomplishing this task?
Take a look at the back of your computer. The stationary
connector is fitted with jackscrew sockets
Emacs!
while the connector on the pendant cable is fitted
with jack screws of some variety. We had some discussion
here on the List a few months back about the convenience
of 4-40 capscrews with recessed hex sockets. But this
catalog page shows several of many alternatives.
http://www.keyelco.com/pdfs/M55p74.pdf
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
Message 19
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| Subject: | Re: model airplane servo |
>On Sat, Jan 15, 2011 at 8:55 PM, Robert Taylor
><<mailto:Flydad57@neo.rr.com>Flydad57@neo.rr.com> wrote:
><<mailto:Flydad57@neo.rr.com>Flydad57@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. >
================================
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| Subject: | Re: 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
Sent: Sunday, January 16, 2011 12:11 AM
Subject: Re: AeroElectric-List: model airplane servo
On Sat, Jan 15, 2011 at 8:55 PM, Robert Taylor <Flydad57@neo.rr.com>
wrote:
<Flydad57@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. >
=======
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