Today's Message Index:
----------------------
1. 06:24 AM - Re: I-Phone Inclinometer (rampil)
2. 07:48 AM - The Word According to ISO (Off Topic) (Eric M. Jones)
3. 07:55 AM - John Deere dynamo (Beemer)
4. 08:00 AM - Z-Diagram using Kilovac EV200? (mikef)
5. 08:08 AM - John Deere dynamo (Beemer)
6. 09:38 AM - Re: I-Phone Inclinometer (rampil)
7. 10:18 AM - Re: Re: I-Phone Inclinometer (David Glauser)
8. 11:34 AM - Re: Re: I-Phone Inclinometer (David M)
9. 11:53 AM - Relay Tyco EV200 (Fergus Kyle)
10. 12:26 PM - Re: Relay Tyco EV200 (Robert Borger)
11. 12:40 PM - Re: Relay Tyco EV200 (mikef)
12. 12:57 PM - Re: Relay Tyco EV200 (Harley)
13. 12:59 PM - Re: Relay Tyco EV200 (Harley)
14. 01:11 PM - Re: Re: I-Phone Inclinometer (Etienne Phillips)
15. 03:34 PM - Re: John Deere dynamo (Robert L. Nuckolls, III)
16. 03:36 PM - Re: Z-Diagram using Kilovac EV200? (Robert L. Nuckolls, III)
17. 03:46 PM - Re: Re: I-Phone Inclinometer (Robert L. Nuckolls, III)
18. 04:09 PM - Re: Z-Diagram using Kilovac EV200? (James Robinson)
19. 04:51 PM - Re: Re: I-Phone Inclinometer (Ed Anderson)
20. 06:47 PM - Re: John Deere dynamo (Ernest Christley)
21. 06:50 PM - Re: John Deere dynamo (Ken)
22. 08:27 PM - Re: Igntion Switches------ (Electrical Grimlens) ()
Message 1
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| Subject: | Re: I-Phone Inclinometer |
Etienne,
SS Gyros are in fact MEMS accelerometers.
Actually SS Gyro is an oxymoron since a gyro implies gyroscopic
which implies spinning parts (hard to be solid state at the same time).
See: http://en.wikipedia.org/wiki/MEMS_gyroscope
http://www.sensorsmag.com/articles/0203/14/
http://www.analog.com/en/mems-and-sensors/imems-gyroscopes/adxrs610/products/product.html
etc., etc.
To my knowledge, the inertial platforms of BMA, Dynon, Avidyne (entegra), and Garmin
(G1000) are all MEMS-based. No Gyro components at all.
See for ref:http://www.flyingmag.com/article.asp?section_id=12&article_id=869
or look up the tech specs on the individual systems
PS: The iPhone would need a 3axis sensor to do an inertial platform.
I dont know if thats what's inside.
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=197865#197865
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| Subject: | The Word According to ISO (Off Topic) |
Bob et al.,
I too had a thousand similar experiences in industry. Recently in the Worcester
Business Journal I published a rebuttal to a "Business Leader" who believed the
solution to all our problems is to hire more foreign H-1B's. (For anyone interested
I will email you my flame job).
I have sat in meetings where the "Team Approach" was touted to lead to the best
designs...(more brains are sooooo much better). Laughable. They suffered from
the notion that all ideas have equal validity, and everyone has something to
contribute to every project. Not true.
I was good friends with a Chinese engineer who had run a variety of electronic
parts and subassembly businesses in Taiwan (until one day he decided to invest
all the company cash into the ferrite material they used...and the bottom fell
out of the ferrite market), Standard Operating Procedures for them involved
driving the CSA, UL, ETL, ISO or any foreign inspector from the airport to the
best hotel. Then supplying them the best food, prostitutes and liquor. In the
morning all the inspection paperwork would be signed. I could tell you a similar
story, involving booze, Tijuana hookers and a brand new Winnebago about why
Remington Rand's top dogs decided that didn't really need local service centers
after all, and thus fell out of the computer market. If you think this isn't
common, see "Charlie Wilson's War". But I digress....
My Chinese Engineer friend had great disdain for paper-pushers, and high confidence
that outside inspectors would never meaningfully contribute to the process.
I had a somewhat higher respect for the inspection agencies. Once in a meeting
where something in a design was terribly amiss and it meant we either fixed
it or lost our sticker, my boss challenged, "Well, who's going to tell CSA?".
I challenged him that I would tell them if it wasn't fixed. Much to my boss's chagrin.
And I think it cost me plenty. I am only bitter about not having had the
courage to leave when I should have.
My advise to young engineers/designers: Don't work for ANY company for more than
five years unless you own a serious piece of it. Period. Don't even think about
it. And as soon as you can, start your OWN company. You might not make a fortune,
but you won't have to work for jerks and you'll wake up in the morning
with a contented soul, happy to start the day.
"THE VERY BIG STUPID" is a thing which breeds by eating
The Future. Have you seen it? It sometimes disguises itself as a
good-looking quarterly bottom line, derived by closing the R&D
Department.
--Frank Zappa
[Do Not Archive]
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=197883#197883
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| Subject: | John Deere dynamo |
Hi all,
I have a question concerning using a dynamo at higher engine speeds. I am looking
at reducing my FWF weight, and considering some of the smaller alternator installs.
I am currently using a ND IR alt, which is fine, but in lurking around,
I'm becoming rather concerned about the weaknesses of these units. Unfortunately,
not much else is available in this class; i.e. size and weight. All of
the externally regulated alternators I've seen are much too large and heavy for
my application.
I'm installing Z-13RB on my new plane, and plan on incorporating Z-24 alt disconnect
contactor in line with the OV module.
However, my Suzuki G10 three cylinder runs at 5000rpm in cruise, and 5500rpm on
takeoff. The JD AM877557 PM alt puts out 20amps at 2500rpm. I'm running double
that. Short of re-doing my belt drive setup with a 12 inch pulley, what are
the ramifications of running this little alt at these speeds? by the looks of
it, the small pulley on the unit would spin it up to 10,000 rpm. I'm aware of
the mechanical limits (bearings, etc), my question concerns the power output to
the system.
Any help would be much appreciated.
Bradley
Kitfox 2/3
Middle Georgia
--------
Beemer
KF2 (and now an M3!)
Middle Georgia
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=197887#197887
Attachments:
http://forums.matronics.com//files/jd_am877557_dynamo_211.bmp
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| Subject: | Z-Diagram using Kilovac EV200? |
I seem to recall seeing a Z diagram using one of the 'newer' contactors like a
Kilovac EV 200 or Gigavac GX11. Could someone point me to that diagram, either
the name or link on Bob's website.
Thank you,
Mike
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=197888#197888
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| Subject: | John Deere dynamo |
Hi all,
I have a question concerning using a dynamo at higher engine speeds. I am looking
at reducing my FWF weight, and considering some of the smaller alternator installs.
I am currently using a ND IR alt, which is fine, but in lurking around,
I'm becoming rather concerned about the weaknesses of these units. Unfortunately,
not much else is available in this class; i.e. size and weight. All of
the externally regulated alternators I've seen are much too large and heavy for
my application.
I'm installing Z-13RB on my new plane, and plan on incorporating Z-24 alt disconnect
contactor in line with the OV module.
However, my Suzuki G10 three cylinder runs at 5000rpm in cruise, and 5500rpm on
takeoff. The JD AM877557 PM alt puts out 20amps at 2500rpm. I'm running double
that. Short of re-doing my belt drive setup with a 12 inch pulley, what are
the ramifications of running this little alt at these speeds? by the looks of
it, the small pulley on the unit would spin it up to 10,000 rpm. I'm aware of
the mechanical limits (bearings, etc), my question concerns the power output to
the system.
Any help would be much appreciated.
Bradley
Kitfox 2/3
Middle Georgia
--------
Beemer
KF2 (and now an M3!)
Middle Georgia
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=197889#197889
Attachments:
http://forums.matronics.com//files/jd_am877557_dynamo_211.bmp
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| Subject: | Re: I-Phone Inclinometer |
As it turns out, the iPhone uses a monolithic 3 axis sensor, digitally
sampled 8 bit outputs scaled to +/- 2 g or 8 g with 400Hz serial output.
Sounds like the makings of an inertial platform to me!
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=197910#197910
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| Subject: | Re: I-Phone Inclinometer |
Several folks are experimenting already:
http://blog.medallia.com/2007/08/fun_with_the_iphone_accelerome.html
"As it turns out, the iPhone has a built-in LIS302DL, a tiny 3-axis
accelerometer. While some have attempted to use it from within the
Safari browser (the Tilt game detects changes to the width of the
browser page; it is basically used as a 1-bit input device), its
potential is still somewhat untapped. After a rather lengthy bout of
reverse-engineering (I had barely touched ARM assembly before this), I
finally figured out how to access the raw data from the accelerometer
itself, as can be seen in the video above. Source code is posted here.
(update: yes, it is possible to access the accelerometer directly
through UIKit without this hack -- however, you'll be locked to the
default sample rate, which is too slow for some of the fun stuff)"
http://www.tuaw.com/2007/09/10/iphone-coding-using-the-accelerometer/
dg
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
rampil
Sent: Monday, August 11, 2008 9:37 AM
Subject: AeroElectric-List: Re: I-Phone Inclinometer
As it turns out, the iPhone uses a monolithic 3 axis sensor, digitally
sampled 8 bit outputs scaled to +/- 2 g or 8 g with 400Hz serial output.
Sounds like the makings of an inertial platform to me!
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=197910#197910
Message 8
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| Subject: | Re: I-Phone Inclinometer |
Freescale (used to be Motorola) makes a ton of these MEMS accelerometers. I
have one on one of their sample boards that also has several other goodies
for experimentation. It was like $99 or so, including the class for the
cpu. However, CodeWarrior is the only software they use for demo'ing and it
is SO arcane it's practically like pulling teeth every time I want to use
it. Also, the laptop that has all their routines has crashed, of course.
Dang laptops. Anyway, ...
If there is anything I can do to help, let me know.
I plan to use the accelerometer, or one similar, for wing leveling and etc
for a Mustang II.
David
----- Original Message -----
From: "David Glauser" <david.glauser@xpsystems.com>
Sent: Monday, August 11, 2008 12:16 PM
Subject: RE: AeroElectric-List: Re: I-Phone Inclinometer
> <david.glauser@xpsystems.com>
>
> Several folks are experimenting already:
>
> http://blog.medallia.com/2007/08/fun_with_the_iphone_accelerome.html
>
> "As it turns out, the iPhone has a built-in LIS302DL, a tiny 3-axis
> accelerometer. While some have attempted to use it from within the
> Safari browser (the Tilt game detects changes to the width of the
> browser page; it is basically used as a 1-bit input device), its
> potential is still somewhat untapped. After a rather lengthy bout of
> reverse-engineering (I had barely touched ARM assembly before this), I
> finally figured out how to access the raw data from the accelerometer
> itself, as can be seen in the video above. Source code is posted here.
> (update: yes, it is possible to access the accelerometer directly
> through UIKit without this hack -- however, you'll be locked to the
> default sample rate, which is too slow for some of the fun stuff)"
>
>
> http://www.tuaw.com/2007/09/10/iphone-coding-using-the-accelerometer/
>
>
> dg
>
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
> rampil
> Sent: Monday, August 11, 2008 9:37 AM
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: Re: I-Phone Inclinometer
>
>
> As it turns out, the iPhone uses a monolithic 3 axis sensor, digitally
> sampled 8 bit outputs scaled to +/- 2 g or 8 g with 400Hz serial output.
>
> Sounds like the makings of an inertial platform to me!
>
> --------
> Ira N224XS
>
Checked by AVG - http://www.avg.com
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| Subject: | Relay Tyco EV200 |
Hello,
On the scrounge again.......... Can anyone North American tell me
where to acquire an EV200 12Vdc contactor? I understand that it has a hold
circuit which reverts to I think 0.14A coil hold value which I can manage. I
have been attempting to incorporate a racing car shutoff as main battery
contact because I can't budget for more in view of circuit demands.
Any or all available dealers received with thanks........
Ferg
Europa A064
Message 10
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| Subject: | Re: Relay Tyco EV200 |
Ferg,
Try these sources:
www.evparts.com/prod-SL2570.htm
http://www.evsource.com/tls_relays.php
They are not inexpensive bits...
Good building and great flying,
Bob Borger
Europa Kit #A221 N914XL, XS Mono, Intercooled 914, Airmaster C/S
http://www.europaowners.org/N914XL
(99.9% done) Presently fighting gremlins in the instrument panel.
3705 Lynchburg Dr.
Corinth, TX 76208
Home: 940-497-2123
Cel: 817-992-1117
On Aug 11, 2008, at 13:50, Fergus Kyle wrote:
>
> Hello,
> On the scrounge again.......... Can anyone North American tell me
> where to acquire an EV200 12Vdc contactor? I understand that it has
> a hold
> circuit which reverts to I think 0.14A coil hold value which I can
> manage. I
> have been attempting to incorporate a racing car shutoff as main
> battery
> contact because I can't budget for more in view of circuit demands.
> Any or all available dealers received with thanks........
> Ferg
> Europa A064
>
>
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| Subject: | Re: Relay Tyco EV200 |
Here is another link, seem less expensive.
http://www.marineboatsupplies.com/blue-9012-solenoid-series-250a1224v-p-3535.html
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=197956#197956
Message 12
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| Subject: | Re: Relay Tyco EV200 |
Here's one source...
Fergus Kyle wrote:
>
> Hello,
> On the scrounge again.......... Can anyone North American tell me
> where to acquire an EV200 12Vdc contactor? I understand that it has a hold
> circuit which reverts to I think 0.14A coil hold value which I can manage. I
> have been attempting to incorporate a racing car shutoff as main battery
> contact because I can't budget for more in view of circuit demands.
> Any or all available dealers received with thanks........
> Ferg
> Europa A064
>
>
> Agelesswings certifies that no virus is in this incoming message.
> Checked by AVG - http://www.avg.com
>
>
>
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| Subject: | Re: Relay Tyco EV200 |
Here's one source:
www.evparts.com/prod-SL2570.htm
I just googled "EV200 12 Vdc contactor"
And got over 200 pages...might be a lower cost version there someplace.
Harley Dixon
------------------------------------------------------------------------
Fergus Kyle wrote:
>
> Hello,
> On the scrounge again.......... Can anyone North American tell me
> where to acquire an EV200 12Vdc contactor? I understand that it has a hold
> circuit which reverts to I think 0.14A coil hold value which I can manage. I
> have been attempting to incorporate a racing car shutoff as main battery
> contact because I can't budget for more in view of circuit demands.
> Any or all available dealers received with thanks........
> Ferg
> Europa A064
>
>
> Agelesswings certifies that no virus is in this incoming message.
> Checked by AVG - http://www.avg.com
>
>
>
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| Subject: | Re: I-Phone Inclinometer |
> On 11 Aug 2008, at 3:20 PM, rampil wrote:
>> <ira.rampil@gmail.com>
>>
>> Etienne,
>> SS Gyros are in fact MEMS accelerometers.
>> Actually SS Gyro is an oxymoron since a gyro implies gyroscopic
>> which implies spinning parts (hard to be solid state at the same
>> time).
>>
>> See: http://en.wikipedia.org/wiki/MEMS_gyroscope
>> http://www.sensorsmag.com/articles/0203/14/
>> http://www.analog.com/en/mems-and-sensors/imems-gyroscopes/
>> adxrs610/products/product.html
>>
>> etc., etc.
>>
and
On 11 Aug 2008, at 8:28 PM, David M wrote:
>
> I plan to use the accelerometer, or one similar, for wing leveling
> and etc for a Mustang II.
>
> David
>
How does an accelerometer know which way is up in a co-ordinated turn?
My understanding of a "solid-state gyro" (please correct me if I'm
wrong), is that it contains a sprung vibrating weight which, like a
pendulum, is adverse to changing the axis of it's motion. The sensor
part of the device measures the deviation of the weights axis of
vibration against the casing of the unit, and from that can calculate
the rate of change in direction of the casing...
An accelerometer (again, according to my understanding) has a similar
sensor between a non-vibrating sprung weight, and the deviation of
the weight from the centre of the casing can then be used to
determine the acceleration of the casing.
Etienne
Message 15
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| Subject: | Re: John Deere dynamo |
At 07:52 AM 8/11/2008 -0700, you wrote:
>
>Hi all,
>I have a question concerning using a dynamo at higher engine speeds. I am
>looking at reducing my FWF weight, and considering some of the smaller
>alternator installs. I am currently using a ND IR alt, which is fine, but
>in lurking around, I'm becoming rather concerned about the weaknesses of
>these units.
Can you give us your perceptions of "weakness"?
> Unfortunately, not much else is available in this class; i.e. size and
> weight. All of the externally regulated alternators I've seen are much
> too large and heavy for my application.
>
>I'm installing Z-13RB on my new plane, and plan on incorporating Z-24 alt
>disconnect contactor in line with the OV module.
??? I got lost here. Z-24 speaks to classic,
wound field alternators like ND . . . are you
looking for a wound field or permanent magnet
fielded machine?
>However, my Suzuki G10 three cylinder runs at 5000rpm in cruise, and
>5500rpm on takeoff. The JD AM877557 PM alt puts out 20amps at 2500rpm. I'm
>running double that. Short of re-doing my belt drive setup with a 12 inch
>pulley, what are the ramifications of running this little alt at these speeds?
Mechanically, no problem. Raising the speed increased the
AC voltage to be "rectified and regulated" down to
14v for operating your equipment. There ARE switch-mode
regulator designs that would handle this job nicely
but that's a whole separate development program.
> by the looks of it, the small pulley on the unit would spin it up to
> 10,000 rpm. I'm aware of the mechanical limits (bearings, etc), my
> question concerns the power output to the system.
Valid concerns as I've suggested above. Those things
run 20-30 VAC output at 5000 rpm so you need to plan
on 2x that at 10,000. Increasing speed is a good way
to get more energy OUT of the PM package as long as
the electronics can handle it but it's doubtful that
any regulator presently exists that fill your
requirements.
Bob . . .
Message 16
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| Subject: | Re: Z-Diagram using Kilovac EV200? |
At 07:58 AM 8/11/2008 -0700, you wrote:
>
>I seem to recall seeing a Z diagram using one of the 'newer' contactors
>like a Kilovac EV 200 or Gigavac GX11. Could someone point me to that
>diagram, either the name or link on Bob's website.
You can substitute contactors in any of the Z-figures.
I think I did a "special" Z-14 way back when . . . but
it simply depicts the flying lead connections to the
EV series contactors. The Gigavac is terminal connections.
There would be no changes to the Z-figures.
http://www.aeroelectric.com/Pictures/Contactors/Gigavac_GX11.gif
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 17
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| Subject: | Re: I-Phone Inclinometer |
At 06:20 AM 8/11/2008 -0700, you wrote:
>
>Etienne,
>SS Gyros are in fact MEMS accelerometers.
>Actually SS Gyro is an oxymoron since a gyro implies gyroscopic
>which implies spinning parts (hard to be solid state at the same time).
Correct. The devices are not accelerometers but rotational
rate sensors. Same sensed stimulus that your turn/bank
or turn-coordinator responds to.
>See: http://en.wikipedia.org/wiki/MEMS_gyroscope
>http://www.sensorsmag.com/articles/0203/14/
>http://www.analog.com/en/mems-and-sensors/imems-gyroscopes/adxrs610/products/product.html
>
>etc., etc.
>
>To my knowledge, the inertial platforms of BMA, Dynon, Avidyne (entegra),
>and Garmin (G1000) are all MEMS-based. No Gyro components at all.
>
>See for ref:http://www.flyingmag.com/article.asp?section_id=12&article_id=869
>
>or look up the tech specs on the individual systems.
There are a variety of MEMS sensors responsive to
apparent gravity vectors which ARE true accelerometers.
There are a number of "digital inclinometers" on the market
that utilize two and three axis sensors of this variety.
Unlike precision accelerometers of yesteryear, these things
have a frequency response that goes down to DC. Imminently
suited to inclinometer service.
The rotational rate sensors are finding their way into
high-end GPS receivers to resolve vehicular turning
rate to let the guidance software know that you've
REALLY turned the corner it suggested. Less expensive
units need several seconds of new GPS data to resolve a
new course over the ground to confirm that the turn was
made.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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| Subject: | Re: Z-Diagram using Kilovac EV200? |
Hi Bob
I missed part of this thread.- Are these better contactor or ?
--- On Mon, 8/11/08, Robert L. Nuckolls, III <nuckolls.bob@cox.net> wrote:
From: Robert L. Nuckolls, III <nuckolls.bob@cox.net>
Subject: Re: AeroElectric-List: Z-Diagram using Kilovac EV200?
<nuckolls.bob@cox.net>
At 07:58 AM 8/11/2008 -0700, you wrote:
<mikefapex@gmail.com>
>
>I seem to recall seeing a Z diagram using one of the 'newer'
contactors
>like a Kilovac EV 200 or Gigavac GX11. Could someone point me to that
>diagram, either the name or link on Bob's website.
You can substitute contactors in any of the Z-figures.
I think I did a "special" Z-14 way back when . . . but
it simply depicts the flying lead connections to the
EV series contactors. The Gigavac is terminal connections.
There would be no changes to the Z-figures.
http://www.aeroelectric.com/Pictures/Contactors/Gigavac_GX11.gif
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 19
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| Subject: | Re: I-Phone Inclinometer |
Etienne,
I am well underway designing my own Lateral Stabilization System (more
commonly know as a wing leveler) using MEMS Gyros and Accelerometer.
There is a lot of assumptions made and it takes a lot of studying to
understand the use and limitations of such devices. For one thing, the
capability of the MEMS units vary from cheap toy quality to very expensive
top quality units. So one can not just lump them all together in terms of
capability (or cost {:<()
For example, a lot of folks believe that in a coordinated, level turn the
accelerometer is useless in defining the attitude of the aircraft. It
depends on the accelerometer, but a two axis accelerometer of sufficient
sensitvity can indeed tell you that you are in a turn of X deg bank. The
reason is that, of course, in a coordinated turn the number of G's you pull
is dependent on your bank angle. The old 60 deg = 2 G example comes to
mind. So if your accelerometer is measuring 2 Gs then you are not straight
and level and are most likely in a 60 deg bank. But, an accelerometer is not
very good in attitude rapid changes which the gyro excels at. On the other
hand, the gyro has inherent drift which if integrated over time becomes very
large. So the gyro for rapid sensing and the accelerometer for the steady
state is an approach taken by many. So the right combination draws on the
strengths of both types to overcome the weakness of the others.
However, not just any accelerometer can do that - its only recently that
some of the MEM accelerometers have been developed with sufficient
sensitivity - measurable in milli gs!! that this has been fairly easy to do.
But, even so, I never really understood how complex the entire area is until
I started on this project and really got into it. Does Cascade PID with
poles and zeros ring your chimes {:>)? But, it is interesting and fun
regardless of the outcome.
I have my circuit board designed and components just ordered. Now working
on the software to try to make it all work. We, will see.
So jump in and get started - your mind will like you for it {:>)
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
http://www.andersonee.com
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.dmack.net/mazda/index.html
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Etienne
Phillips
Sent: Monday, August 11, 2008 4:09 PM
Subject: Re: AeroElectric-List: Re: I-Phone Inclinometer
<etienne.phillips@gmail.com>
> On 11 Aug 2008, at 3:20 PM, rampil wrote:
>> <ira.rampil@gmail.com>
>>
>> Etienne,
>> SS Gyros are in fact MEMS accelerometers.
>> Actually SS Gyro is an oxymoron since a gyro implies gyroscopic
>> which implies spinning parts (hard to be solid state at the same
>> time).
>>
>> See: http://en.wikipedia.org/wiki/MEMS_gyroscope
>> http://www.sensorsmag.com/articles/0203/14/
>> http://www.analog.com/en/mems-and-sensors/imems-gyroscopes/
>> adxrs610/products/product.html
>>
>> etc., etc.
>>
and
On 11 Aug 2008, at 8:28 PM, David M wrote:
>
> I plan to use the accelerometer, or one similar, for wing leveling
> and etc for a Mustang II.
>
> David
>
How does an accelerometer know which way is up in a co-ordinated turn?
My understanding of a "solid-state gyro" (please correct me if I'm
wrong), is that it contains a sprung vibrating weight which, like a
pendulum, is adverse to changing the axis of it's motion. The sensor
part of the device measures the deviation of the weights axis of
vibration against the casing of the unit, and from that can calculate
the rate of change in direction of the casing...
An accelerometer (again, according to my understanding) has a similar
sensor between a non-vibrating sprung weight, and the deviation of
the weight from the centre of the casing can then be used to
determine the acceleration of the casing.
Etienne
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Message 20
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| Subject: | Re: John Deere dynamo |
Beemer wrote:
> However, my Suzuki G10 three cylinder runs at 5000rpm in cruise, and 5500rpm
on takeoff. The JD AM877557 PM alt puts out 20amps at 2500rpm. I'm running double
that. Short of re-doing my belt drive setup with a 12 inch pulley, what are
the ramifications of running this little alt at these speeds? by the looks of
it, the small pulley on the unit would spin it up to 10,000 rpm. I'm aware of
the mechanical limits (bearings, etc), my question concerns the power output
to the system.
>
> Any help would be much appreciated.
>
Have you considered running a motorcycle generator coaxially?
http://ernest.isa-geek.org/Delta/Pictures/EngineGeneratorParts.jpg
http://ernest.isa-geek.org/Delta/Pictures/EngineGeneratorTest.jpg
http://ernest.isa-geek.org/Delta/Pictures/EngineGeneratorMount.jpg
http://ernest.isa-geek.org/Delta/Pictures/EngineGeneratorMounted2.jpg
http://ernest.isa-geek.org/Delta/Pictures/EngineGeneratorAirIntakeAndCooling.jpg
--
http://www.ernest.isa-geek.org
Message 21
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| Subject: | Re: John Deere dynamo |
Bradley
I have a couple of hundred hours on a JD 20 amp PM alternator spinning
at about 8500 rpm with the JD regulator. Occasionally up to around
11,000 rpm. My somewhat hazy memory is that it needs more like 6500 rpm
to put out 20 amps. Someone (Langford??) has a website with a bunch of
info on using these. I fitted a multi-v pulley that probably loads the
bearings a bit less than the original single v pulley.
From memory the unit is around 4.5 lb plus regulator compared to around
6 lb for the conventional 40 amp ND alternator that I mentioned earlier,
so not a big weight saver. I don't have any reason to think either is
more reliable. In fact it seems that the JD regulator will fail if you
start the engine with a totally dead or disconnected battery. A small OV
relay will suffice on the JD unit instead of a heavy contactor though
and mine is wired between the alternator and the regulator. There are
smaller PM units available such as Kubota units.
Ken
Beemer wrote:
>
> Hi all,
> I have a question concerning using a dynamo at higher engine speeds. I am looking
at reducing my FWF weight, and considering some of the smaller alternator
installs. I am currently using a ND IR alt, which is fine, but in lurking around,
I'm becoming rather concerned about the weaknesses of these units. Unfortunately,
not much else is available in this class; i.e. size and weight. All of
the externally regulated alternators I've seen are much too large and heavy
for my application.
>
> I'm installing Z-13RB on my new plane, and plan on incorporating Z-24 alt disconnect
contactor in line with the OV module.
>
> However, my Suzuki G10 three cylinder runs at 5000rpm in cruise, and 5500rpm
on takeoff. The JD AM877557 PM alt puts out 20amps at 2500rpm. I'm running double
that. Short of re-doing my belt drive setup with a 12 inch pulley, what are
the ramifications of running this little alt at these speeds? by the looks of
it, the small pulley on the unit would spin it up to 10,000 rpm. I'm aware of
the mechanical limits (bearings, etc), my question concerns the power output
to the system.
>
> Any help would be much appreciated.
>
> Bradley
> Kitfox 2/3
> Middle Georgia
>
> --------
> Beemer
> KF2 (and now an M3!)
> Middle Georgia
>
Message 22
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| Subject: | Re: Igntion Switches------ (Electrical Grimlens) |
8/1/2008
Hello Tim, While I am pondering your situation I will pass your info on to
the experts on the Matronics aeroelectric-list to see what they can come up
with.
'OC' Says: "The best investment we can make is the effort to gather and
understand knowledge."
--------------------------------------------------------------
----- Original Message -----
From: "F. Tim Yoder" <ftyoder@yoderbuilt.com>
Sent: Monday, August 11, 2008 5:33 PM
Subject: Re: Igntion Switches------ (Electrical Grimlens)
> {#} Replies are directed back to kisbuilders@angus.mystery.com
> {#} To reply to the author, write to "F. Tim Yoder"
> <ftyoder@yoderbuilt.com>
>
> Hi OC,
>
> Two things;
>
> First, I flew my TR-1, with a friend, to OSH on the 26th and returned the
> 31st. We actually flew into FLD From Mesa AZ (FFZ). Their were noticabley
> fewer people in the crowd but the number of planes on the ramp at OSH and
> FLD seemed about the same as last year. I flew from Mesa, AZ to FLD, about
> 1350 nm and back using 125.1 GAL. in 19.8 HRS. That works out to 6.32 GPH,
> not bad! My TR-1 has the IO-240 B1B and I flew at 2550 RPM slightly rich
> of
> peak. Also, I have the Light Speed Elect. Ign. on one side.
>
> Second, I need some help!
> A couple of months ago I noticed that after starting my engine the elect.
> oil pressure needle would jump when I turned on the Altinator switch,
> sometimes. Now I notice it doing that every time I start up. also, I find
> that ocasionally when the oil temp. is hot the needle will pulse from
> 45psi
> to 35psi. Then yesterday, the first flight after returning from OSH, I
> flew
> to another local airport for cheeper fuel. My radio transmitted normally
> leaving however, when I transmitted at the destination airport it was
> garbled and unreadable. I noticed that the TX symbel was flashing during
> my
> transmissions. My reception was clear. After fueling I transmitted and the
> radio appeared to be okay. When I got back to my home field my
> transmissions
> were garbled again. When I got back to the hanger I determined the
> following.
> At idle RPM I could hear a little of the clicking noise during test
> transmissions.
> The co-pilot PTT did the same thing.
> I also noticed that the oil pressure needle would jump when I pushed the
> PTT.
> I pulled all the circut breakers one at a time and was unable to eliminate
> the problem.
> With the radio off the oil pressure needle jumps when I cycle the
> altinator
> switch.
>
> I hope this information might allow you to give me some suggestions on
> what
> might be going on.
> Personally I think it's Voo Doo & Black Magic!
>
> Thanks, Tim
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