Today's Message Index:
----------------------
1. 05:35 AM - Re: Torque measurement with strain gauge (BobsV35B@aol.com)
2. 05:41 AM - Re: Torque measurement with strain gauge (Paul Wilson)
3. 05:52 AM - Crow Bar OV Protection ()
4. 06:20 AM - Wire labels (Dean Head)
5. 07:03 AM - Re: Crow Bar OV Protection ()
6. 07:49 AM - Re: Wire labels (Bruce Gray)
7. 07:51 AM - Re: Wire labels (John Slade)
8. 08:48 AM - Re: Wire labels (Melvinke@aol.com)
9. 09:02 AM - Re: Wire labels (Robert L. Nuckolls, III)
10. 09:05 AM - Re: Sealed coax connectors (Robert L. Nuckolls, III)
11. 09:12 AM - Mom-on toggle (Larry Bowen)
12. 09:22 AM - Circuit breaker recommendation (Paul McAllister)
13. 11:08 AM - Re: Circuit breaker recommendation (Robert L. Nuckolls, III)
14. 11:17 AM - Re: Mom-on toggle (Robert L. Nuckolls, III)
15. 01:27 PM - Re: Wire labels (John Schroeder)
16. 01:56 PM - Wire cross sectional area (Gerald Giddens)
17. 02:51 PM - Re: Wire labels (Robert L. Nuckolls, III)
18. 02:55 PM - Re: Mom-on toggle (Larry Bowen)
19. 03:15 PM - Re: Torque measurement with strain gauge (Robert L. Nuckolls, III)
20. 03:16 PM - Re: Nav antenna next to Comm (Robert L. Nuckolls, III)
21. 08:40 PM - Re: Wire cross sectional area (Robert L. Nuckolls, III)
22. 10:40 PM - Re: Wire cross sectional area (Gerald Giddens)
23. 11:45 PM - Re: Torque measurement with strain gauge (James Foerster)
Message 1
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| Subject: | Re: Torque measurement with strain gauge |
--> AeroElectric-List message posted by: BobsV35B@aol.com
In a message dated 6/6/2003 10:10:35 PM Eastern Standard Time, jmfpublic@attbi.com
writes:
> Or, has
> anyone tried this and found that it is impossible?
Good Morning jmf,
I don't believe anyone has found it to be impossible, but it has been tried before.
I am not sure who did it, though it might have been Texas Insruments and Al Hundere
may have been involved.
To the best of my recollection, it was in Texas and the strain gauges were affixed
to the engine mounts in a Beechcraft model 18. The circa was around 1960.
It was hoped that a low cost torquemeter could be developed.
The reports were favorable, but it never made it to market.
Maybe it is time to try again with modern technology, it might work great!
Happy Skies,
Old Bob
Message 2
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| Subject: | Re: Torque measurement with strain gauge |
--> AeroElectric-List message posted by: Paul Wilson <pwilson@climber.org>
>--> AeroElectric-List message posted by: jmfpublic@attbi.com
>
>Bob or anyone,
>I'm installing a Blue Mountain EFIS and this allows me to set up 'instrument
>gauges' with any label that I want, as long as I can get an analog voltage to
>represent the measurement. I would like to measure HP output from the engine.
>HP=(Torque)(RPM)/5252. Strain gauges are old technology with which I have no
>experience. A strain gauge on the prop shaft is hard to interface. Power and
>signal must pass either sliding rings and brushes :>(( or else use some
>magnetic and optical coupling. However, strain gauges on the engine mount
>would be easy to connect, but I'm not sure that I could separate torque moments
>from the linear stresses of just holding the weight of the engine. I believe
>that there are strain gauges with a 45 degree pattern that respond to torque
>more than to linear stress, but I hardly know where to start reading. Or, has
>anyone tried this and found that it is impossible? I did send off to Omega for
>some literature. I envision building a Wheatstone bridge arrangement feeding
>an instrumentation amplifier. Any thoughts/pearls/war stories?
=========
Why not just buy an automotive gadget that gives direct readout of acceleration,
horsepower plus other things. Pretty simple just turn it on and read the numbers
while in motion. No wires to connect.
Many outfits sell the gadgets. Do a Google search and find one to fit your needs/desires. Start with www.gtimer.com
Paul
--
Message 3
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| Subject: | Crow Bar OV Protection |
--> AeroElectric-List message posted by: <315@cox.net>
Hi Bob,
I am installing your Crow Bar OV Module and was wondering if it would be okay to
use a 7 amp breaker instead of a 5 amp? The smallest gauge wire in the circuit
is 16 G except for the OV module wire which appears to be smaller. I already
have a 7 amp breaker available in the panel, do I need to replace it with
a 5 or can I just use it?
Thanks,
Ned
Message 4
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--> AeroElectric-List message posted by: "Dean Head" <banana@atlantic.net>
Hi,
I am new to the list. I am building a Cozy MK4. I have seen some wire labels
that are printed on shrink tube. Are these labels available or do you need
some sort of "printer" to make them?
Thanks
Dean Head
Cozy MK4 #1040
Message 5
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| Subject: | Re: Crow Bar OV Protection |
--> AeroElectric-List message posted by: <315@cox.net>
Hey guys never mind. Dad had a 5 amp breaker in his 60 year collection of
parts!
Thanks,
Ned
----- Original Message -----
From: <315@cox.net>
Subject: AeroElectric-List: Crow Bar OV Protection
> --> AeroElectric-List message posted by: <315@cox.net>
>
> Hi Bob,
>
> I am installing your Crow Bar OV Module and was wondering if it would be
okay to use a 7 amp breaker instead of a 5 amp? The smallest gauge wire in
the circuit is 16 G except for the OV module wire which appears to be
smaller. I already have a 7 amp breaker available in the panel, do I need
to replace it with a 5 or can I just use it?
>
> Thanks,
> Ned
>
>
Message 6
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--> AeroElectric-List message posted by: "Bruce Gray" <Bruce@glasair.org>
Check out www.kroy.com. They have several models (650 and 2500) of
shrink tube printers. I bought mine on Ebay for $80 including 6
cartridges of shrink tubing.
Bruce
www.glasair.org
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dean
Head
Subject: AeroElectric-List: Wire labels
--> AeroElectric-List message posted by: "Dean Head"
<banana@atlantic.net>
Hi,
I am new to the list. I am building a Cozy MK4. I have seen some wire
labels
that are printed on shrink tube. Are these labels available or do you
need
some sort of "printer" to make them?
Thanks
Dean Head
Cozy MK4 #1040
Message 7
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--> AeroElectric-List message posted by: "John Slade" <sladerj@bellsouth.net>
Hi Dean,
At last, a question on this list I can answer!
I use MS word and a 6 point font to print a sheet of labels, then cut them
up with scissors and insert the label between the shrink tubing and the
wire. Just about any printer and plain paper works great.
Regards,
John Slade
Message 8
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--> AeroElectric-List message posted by: Melvinke@aol.com
The specific shrinktube and the Kroy printer necessary to produce the labels
are available at Graphic Products, <www.graphicproducts.com> ; 1-800-788-5572.
The printer is a Kroy K3000-PC; use Kroy 1/8" yellow shrinktubing. Incredible
job. Well worth the expense.
Kenneth Melvin
FEW Mustang N51KX
Message 9
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--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 10:50 AM 6/7/2003 -0400, you wrote:
>--> AeroElectric-List message posted by: "John Slade" <sladerj@bellsouth.net>
>
>Hi Dean,
>At last, a question on this list I can answer!
>I use MS word and a 6 point font to print a sheet of labels, then cut them
>up with scissors and insert the label between the shrink tubing and the
>wire. Just about any printer and plain paper works great.
>Regards,
>John Slade
For an illustration of how this works, see:
http://www.aeroelectric.com/Catalog/wiring/s817c.jpg
http://www.aeroelectric.com/Catalog/wiring/wiring.html#s816c
Bob . . .
Message 10
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| Subject: | Re: Sealed coax connectors |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 12:37 AM 6/7/2003 +0200, you wrote:
>--> AeroElectric-List message posted by: "Gilles.Thesee"
><Gilles.Thesee@ac-grenoble.fr>
>
>Hi Bob and all,
>
>Found in old issues of Avionics magazine some adds from Pic wire. They talk
>about sealed BNC and TNC connectors to prevent moisture problems.
>Any opinions ?
>
>Regards
>Gilles
Some offerings in BNC connectors have gaskets in them to reduce
probability of splash getting into the connector but NONE are
gas tight . . . meaning that environmental circulation of moisture
due to atmospheric pressure changes WILL happen.
I wouldn't make any special effort to buy a super-whizzy coax
connector for an OBAM project . . .
Now, if it's a taxpayer funded military project, then the
sky's the limit. You can go for gold plated too . . .
Bob . . .
Message 11
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--> AeroElectric-List message posted by: "Larry Bowen" <Larry@bowenaero.com>
I'm looking for a off-(on) toggle switch for use as a starter engage
switch. Same functionality as the push button that Bob sells, but I
want the form-factor of the toggle switches. This will be used with the
red flip-guard. Anyone know a source? I guess one of the
three-position switches would work [xx-xx-(on)], but ...
-
Larry Bowen
Larry@BowenAero.com
http://BowenAero.com
2003 - The year of flight!
Message 12
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| Subject: | Circuit breaker recommendation |
--> AeroElectric-List message posted by: "Paul McAllister" <paul.mcallister@qia.net>
Hi All,
I am going to use Bob's OVP module and I will need to buy a circuit breaker. Can
someone make a recommendation for a CB. A specific brand, type number & suplier
would be helpful.
Thanks, Paul
Message 13
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| Subject: | Re: Circuit breaker recommendation |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 11:22 AM 6/7/2003 -0500, you wrote:
>--> AeroElectric-List message posted by: "Paul McAllister"
><paul.mcallister@qia.net>
>
>Hi All,
>
>I am going to use Bob's OVP module and I will need to buy a circuit
>breaker. Can someone make a recommendation for a CB. A specific brand,
>type number & suplier would be helpful.
>
>Thanks, Paul
Any 5A breaker will do. The folks who sold you the OV protection
module sell a miniature 5A breaker at:
http://www.bandcspecialty.com/cgi-bin/ez-catalog/cat_display.cgi?7X358218
Aircraft Spruce has one a bit larger at:
http://www.aircraftspruce.com/catalog/elpages/pbcircuitbrkr.php
See p/n W23X1A1G5 5 CB-230 5A $11.950
Bob . . .
Message 14
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| Subject: | Re: Mom-on toggle |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 12:12 PM 6/7/2003 -0400, you wrote:
>--> AeroElectric-List message posted by: "Larry Bowen" <Larry@bowenaero.com>
>
>I'm looking for a off-(on) toggle switch for use as a starter engage
>switch. Same functionality as the push button that Bob sells, but I
>want the form-factor of the toggle switches. This will be used with the
>red flip-guard. Anyone know a source? I guess one of the
>three-position switches would work [xx-xx-(on)], but ...
CARLING 6FB5H73XA: ALLIED STOCK # 683-5121
http://www.alliedelec.com/catalog/pf.asp?FN=896.pdf
Bob . . .
Message 15
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--> AeroElectric-List message posted by: John Schroeder <jschroeder@perigee.net>
Bob -
Now that the subject came up again, it would really help to have a feel for
the right sizes. Could you complete the following table for sizing of
shrink wrap? Of course, it varies with the terminal, pin, # of wires, etc.,
but a general size for each would be OK. Many thanks in advance and again
for your past help.
All wire is Mil 22759
22AWG: Size:
20AWG: Size:
18AWG: Size:
16AWG: Size:
14AWG: Size:
12AWG: Size:
10AWG: Size:
08AWG: Size:
06AWG: Size:
04AWG: Size:
02AWG: Size:
Message 16
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| Subject: | Wire cross sectional area |
--> AeroElectric-List message posted by: Gerald Giddens <geraldgiddens@cox.net>
Anyone
Anyone have a reference for the cross sectional area for Mil Spec Wire
#24-#2 and sq inch preferred.
Thanks
Jerry N414PM Reserved
Wiring
Message 17
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--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 04:26 PM 6/7/2003 -0400, you wrote:
>--> AeroElectric-List message posted by: John Schroeder
><jschroeder@perigee.net>
>
>Bob -
>
>Now that the subject came up again, it would really help to have a feel for
>the right sizes. Could you complete the following table for sizing of
>shrink wrap? Of course, it varies with the terminal, pin, # of wires, etc.,
>but a general size for each would be OK. Many thanks in advance and again
>for your past help.
>
>All wire is Mil 22759
>
>22AWG: Size:
>20AWG: Size:
>18AWG: Size:
>16AWG: Size:
>14AWG: Size:
>12AWG: Size:
>10AWG: Size:
>08AWG: Size:
>06AWG: Size:
>04AWG: Size:
>02AWG: Size:
It depends on the kind of heat-shrink you are using. MOST
shrinks drop to 1/2 their manufactured size when
heated. However, referring to the catalog page:
http://216.55.140.222/temp/Allied_p301.pdf we see
shrink ratios as high as 4:1
Here's an excerpt from the spec for Mil-W-22759/16
wire . . . most commonly used for aircraft.
http://216.55.140.222/temp/22759-16.pdf
This chart gives you the overall diameter limits
for the various gages of wire. You'll want ot select
shrink that will close to some value just smaller
than the wire for best fit.
As it turns out, there are only a few sizes necessary
to cover all the bases in applying shrink covers over
wire labels. These are offered by B&C at
http://www.aeroelectric.com/Catalog/BCcatalog.html
down near the bottom of the listing. There's even
a kit of assorted sizes and quqantites that will
probably have enough of every size necessary in
2:1 clear shrink to do an airplane project.
Bob . . .
Message 18
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--> AeroElectric-List message posted by: "Larry Bowen" <Larry@bowenaero.com>
Thanks. I've ordered 3.
-
Larry Bowen
Larry@BowenAero.com
http://BowenAero.com
2003 - The year of flight!
Do not archive
> -----Original Message-----
> >I'm looking for a off-(on) toggle switch for use as a starter engage
> >switch. Same functionality as the push button that Bob sells, but I
> >want the form-factor of the toggle switches. This will be used with
> >the red flip-guard. Anyone know a source? I guess one of the
> >three-position switches would work [xx-xx-(on)], but ...
>
> CARLING 6FB5H73XA: ALLIED STOCK # 683-5121
>
http://www.alliedelec.com/catalog/pf.asp?FN=896.pdf
Bob . . .
Message 19
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| Subject: | Re: Torque measurement with strain gauge |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 03:10 AM 6/7/2003 +0000, you wrote:
>--> AeroElectric-List message posted by: jmfpublic@attbi.com
>
>Bob or anyone,
>I'm installing a Blue Mountain EFIS and this allows me to set up 'instrument
>gauges' with any label that I want, as long as I can get an analog voltage to
>represent the measurement. I would like to measure HP output from the
>engine.
>HP=(Torque)(RPM)/5252. Strain gauges are old technology with which I have no
>experience. A strain gauge on the prop shaft is hard to interface. Power
>and
>signal must pass either sliding rings and brushes :>(( or else use some
>magnetic and optical coupling. However, strain gauges on the engine mount
>would be easy to connect, but I'm not sure that I could separate torque
>moments
>from the linear stresses of just holding the weight of the engine. I believe
>that there are strain gauges with a 45 degree pattern that respond to torque
>more than to linear stress, but I hardly know where to start reading. Or,
>has
>anyone tried this and found that it is impossible? I did send off to Omega
>for
>some literature. I envision building a Wheatstone bridge arrangement feeding
>an instrumentation amplifier. Any thoughts/pearls/war stories?
It's been done but it's pretty ugly. First, the stress on a prop shaft
is rather low . . . seems there is a decidedly enthusiastic interest in
not having prop shafts break. When one goes to measure strain on
a prop shaft surface, the values are exceedingly small. After you've
amplified them up to usable values, you find that every power pulse
from a firing cylinder puts gobs of modulation on the envelope of
average torque. Aerodynamic loads and gyroscopic loading add further
degrees of uncertainty. The task is challenging electronically too.
The best approach I've see was to power the measurement system from
battery and radio the data off the prop from a TM transmitter
housed in the prop spinner. Some fancy footwork with a digital
signal processor integrated the very ratty raw data into usable
information. Is this a short term investigative effort or are you
trying to make your suite of engine instrumentation look like you've
got a turbo-prop installed?
Bob . . .
Message 20
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| Subject: | Re: Nav antenna next to Comm |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 03:55 AM 6/7/2003 +0000, you wrote:
>--> AeroElectric-List message posted by: jmfpublic@attbi.com
>
>Bob, or anyone,
>I have a Jabiru J400 with the comm antenna in the vertical fin, just ahead of
>the rudder. There is a channel in the horizontal stabalizer where the
>elevator
>lies with a perfect fit for some one inch wide brass strip, possibly 0.020
>thick. This would give a broadband, low Q horizontally polarized antenna. My
>receiver is a UPS SL-30, a modern design. Will I have cross-talk problems
>transmitting on the comm frequencies while receiving VOR, or using the third
>harmonic of the antenna for glide-slope?
On VOR maybe but it's only while you're transmitting. On GS, probably
not.
Bob . . .
Message 21
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| Subject: | Re: Wire cross sectional area |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 01:56 PM 6/7/2003 -0700, you wrote:
>--> AeroElectric-List message posted by: Gerald Giddens
><geraldgiddens@cox.net>
>
>Anyone
>
>Anyone have a reference for the cross sectional area for Mil Spec Wire
>#24-#2 and sq inch preferred.
Are you wanting the overall sizes or cross section of
the conductor? For overall size of wires, refer to the
excerpt from the spec I just published for the Mil-W-22759/16
wire at:
http://216.55.140.222/temp/22759-16.pdf
If you're wanting the finely tuned cross sectional area
of the copper, you can calculate based on numbers of strands
use in layup and compute cross section for sum of strands
of the gages cited. Here's a list of data on solid strands
over a limited range
WIRE TABLE FOR SOLID, ROUND COPPER CONDUCTORS
Size Diameter Cross-sectional area Weight
AWG inches cir. mils sq. inches lb/1000 ft
===============================================================
10 -------- 0.1019 ------- 10,380 ------ 0.008155 ----- 31.43
11 -------- 0.09074 ------- 8,234 ------ 0.006467 ----- 24.92
12 -------- 0.08081 ------- 6,530 ------ 0.005129 ----- 19.77
13 -------- 0.07196 ------- 5,178 ------ 0.004067 ----- 15.68
14 -------- 0.06408 ------- 4,107 ------ 0.003225 ----- 12.43
15 -------- 0.05707 ------- 3,257 ------ 0.002558 ----- 9.858
16 -------- 0.05082 ------- 2,583 ------ 0.002028 ----- 7.818
17 -------- 0.04526 ------- 2,048 ------ 0.001609 ----- 6.200
18 -------- 0.04030 ------- 1,624 ------ 0.001276 ----- 4.917
19 -------- 0.03589 ------- 1,288 ------ 0.001012 ----- 3.899
20 -------- 0.03196 ------- 1,022 ----- 0.0008023 ----- 3.092
21 -------- 0.02846 ------- 810.1 ----- 0.0006363 ----- 2.452
22 -------- 0.02535 ------- 642.5 ----- 0.0005046 ----- 1.945
23 -------- 0.02257 ------- 509.5 ----- 0.0004001 ----- 1.542
24 -------- 0.02010 ------- 404.0 ----- 0.0003173 ----- 1.233
25 -------- 0.01790 ------- 320.4 ----- 0.0002517 ----- 0.9699
26 -------- 0.01594 ------- 254.1 ----- 0.0001996 ----- 0.7692
27 -------- 0.01420 ------- 201.5 ----- 0.0001583 ----- 0.6100
28 -------- 0.01264 ------- 159.8 ----- 0.0001255 ----- 0.4837
29 -------- 0.01126 ------- 126.7 ----- 0.00009954 ---- 0.3836
30 -------- 0.01003 ------- 100.5 ----- 0.00007894 ---- 0.3042
31 ------- 0.008928 ------- 79.70 ----- 0.00006260 ---- 0.2413
32 ------- 0.007950 ------- 63.21 ----- 0.00004964 ---- 0.1913
33 ------- 0.007080 ------- 50.13 ----- 0.00003937 ---- 0.1517
34 ------- 0.006305 ------- 39.75 ----- 0.00003122 ---- 0.1203
35 ------- 0.005615 ------- 31.52 ----- 0.00002476 --- 0.09542
36 ------- 0.005000 ------- 25.00 ----- 0.00001963 --- 0.07567
37 ------- 0.004453 ------- 19.83 ----- 0.00001557 --- 0.06001
38 ------- 0.003965 ------- 15.72 ----- 0.00001235 --- 0.04759
39 ------- 0.003531 ------- 12.47 ---- 0.000009793 --- 0.03774
40 ------- 0.003145 ------- 9.888 ---- 0.000007766 --- 0.02993
41 ------- 0.002800 ------- 7.842 ---- 0.000006159 --- 0.02374
42 ------- 0.002494 ------- 6.219 ---- 0.000004884 --- 0.01882
43 ------- 0.002221 ------- 4.932 ---- 0.000003873 --- 0.01493
44 ------- 0.001978 ------- 3.911 ---- 0.000003072 --- 0.01184
Bob . . .
Message 22
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| Subject: | Re: Wire cross sectional area |
--> AeroElectric-List message posted by: Gerald Giddens <geraldgiddens@cox.net>
Bob,
Thanks for the info
Jerry
do not archive
> From: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
> Reply-To: aeroelectric-list@matronics.com
> Date: Sat, 07 Jun 2003 22:39:40 -0500
> To: aeroelectric-list@matronics.com
> Subject: Re: AeroElectric-List: Wire cross sectional area
>
> --> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
> <bob.nuckolls@cox.net>
>
> At 01:56 PM 6/7/2003 -0700, you wrote:
>> --> AeroElectric-List message posted by: Gerald Giddens
>> <geraldgiddens@cox.net>
>>
>> Anyone
>>
>> Anyone have a reference for the cross sectional area for Mil Spec Wire
>> #24-#2 and sq inch preferred.
>
> Are you wanting the overall sizes or cross section of
> the conductor? For overall size of wires, refer to the
> excerpt from the spec I just published for the Mil-W-22759/16
> wire at:
>
> http://216.55.140.222/temp/22759-16.pdf
>
> If you're wanting the finely tuned cross sectional area
> of the copper, you can calculate based on numbers of strands
> use in layup and compute cross section for sum of strands
> of the gages cited. Here's a list of data on solid strands
> over a limited range
>
> WIRE TABLE FOR SOLID, ROUND COPPER CONDUCTORS
>
> Size Diameter Cross-sectional area Weight
> AWG inches cir. mils sq. inches lb/1000 ft
> ===============================================================
>
> 10 -------- 0.1019 ------- 10,380 ------ 0.008155 ----- 31.43
> 11 -------- 0.09074 ------- 8,234 ------ 0.006467 ----- 24.92
> 12 -------- 0.08081 ------- 6,530 ------ 0.005129 ----- 19.77
> 13 -------- 0.07196 ------- 5,178 ------ 0.004067 ----- 15.68
> 14 -------- 0.06408 ------- 4,107 ------ 0.003225 ----- 12.43
> 15 -------- 0.05707 ------- 3,257 ------ 0.002558 ----- 9.858
> 16 -------- 0.05082 ------- 2,583 ------ 0.002028 ----- 7.818
> 17 -------- 0.04526 ------- 2,048 ------ 0.001609 ----- 6.200
> 18 -------- 0.04030 ------- 1,624 ------ 0.001276 ----- 4.917
> 19 -------- 0.03589 ------- 1,288 ------ 0.001012 ----- 3.899
> 20 -------- 0.03196 ------- 1,022 ----- 0.0008023 ----- 3.092
> 21 -------- 0.02846 ------- 810.1 ----- 0.0006363 ----- 2.452
> 22 -------- 0.02535 ------- 642.5 ----- 0.0005046 ----- 1.945
> 23 -------- 0.02257 ------- 509.5 ----- 0.0004001 ----- 1.542
> 24 -------- 0.02010 ------- 404.0 ----- 0.0003173 ----- 1.233
> 25 -------- 0.01790 ------- 320.4 ----- 0.0002517 ----- 0.9699
> 26 -------- 0.01594 ------- 254.1 ----- 0.0001996 ----- 0.7692
> 27 -------- 0.01420 ------- 201.5 ----- 0.0001583 ----- 0.6100
> 28 -------- 0.01264 ------- 159.8 ----- 0.0001255 ----- 0.4837
> 29 -------- 0.01126 ------- 126.7 ----- 0.00009954 ---- 0.3836
> 30 -------- 0.01003 ------- 100.5 ----- 0.00007894 ---- 0.3042
> 31 ------- 0.008928 ------- 79.70 ----- 0.00006260 ---- 0.2413
> 32 ------- 0.007950 ------- 63.21 ----- 0.00004964 ---- 0.1913
> 33 ------- 0.007080 ------- 50.13 ----- 0.00003937 ---- 0.1517
> 34 ------- 0.006305 ------- 39.75 ----- 0.00003122 ---- 0.1203
> 35 ------- 0.005615 ------- 31.52 ----- 0.00002476 --- 0.09542
> 36 ------- 0.005000 ------- 25.00 ----- 0.00001963 --- 0.07567
> 37 ------- 0.004453 ------- 19.83 ----- 0.00001557 --- 0.06001
> 38 ------- 0.003965 ------- 15.72 ----- 0.00001235 --- 0.04759
> 39 ------- 0.003531 ------- 12.47 ---- 0.000009793 --- 0.03774
> 40 ------- 0.003145 ------- 9.888 ---- 0.000007766 --- 0.02993
> 41 ------- 0.002800 ------- 7.842 ---- 0.000006159 --- 0.02374
> 42 ------- 0.002494 ------- 6.219 ---- 0.000004884 --- 0.01882
> 43 ------- 0.002221 ------- 4.932 ---- 0.000003873 --- 0.01493
> 44 ------- 0.001978 ------- 3.911 ---- 0.000003072 --- 0.01184
>
>
> Bob . . .
>
>
>
>
>
>
Message 23
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| Subject: | Re: Torque measurement with strain gauge |
--> AeroElectric-List message posted by: "James Foerster" <jmfpublic@attbi.com>
Thanks you all for the comments and resources. The Circuit Cellar reference was
unclear as to the mechanics of the torque measurement, but it did not involve
a strain gauge. Bob confirmed my suspicion that the very strong prop shaft
would lead to very little strain for the applied stress, and thus a tiny signal,
full of noise. Also, hanging something on the prop shaft that could fly off,
or get unbalanced, demands real engineering and care in manufacture. "First,
do no harm". The engine mount is far more flexible, and thus gives a much
larger output to a strain gauge. I can average out the vibration. The Blue Mountain
software is quite flexible in the setup page, and a moving average is
easy to do.
And yes, I would like to have the instrumentation look like a turboprop, Bob!
Mainly, it will help to compare propellers, but it may also give early warning
of engine malfunction. Or, early warning of pilot malfunction if I try to take
off at high density altitude with insufficient power. I like reassurance.
Jim Foerster Jabiru J400 50% done
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