Today's Message Index:
----------------------
1. 03:17 AM - Lexan (jeff puls)
2. 11:22 AM - Re: Water temperature guage (Perkins, Mike)
3. 11:33 AM - Re: Altimeter Question (Perkins, Mike)
4. 11:59 AM - Re: Water temperature guage (Bob Brennan)
5. 01:33 PM - 582 vs 503 (Stan Tew)
6. 01:52 PM - Re: 582 vs 503 (Jeffrey Dill)
7. 02:45 PM - Re: model 7 Fabric at butt rib to fuselage question? (hansedj)
8. 08:32 PM - Re: Re: model 7 Fabric at butt rib to fuselage question? (Paul A. Franz, P.E.)
Message 1
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Thanks for all the suggestions. I went to Homedepot and bought the
diamond Dremel. Combined with an air tool worked fine. Thanks. Jeff
Classic IV KTZR
Message 2
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| Subject: | Re: Water temperature guage |
Water temperature gauges are usually "amplified" gauges, meaning they
use ship's power to run a small amplifier that multiplies the
thermocouple's signal many times so that it can produce a reading on the
meter. (EGT thermocouples run many times hotter and therefore produce
more voltage, so they often don't use amplifiers but have direct-reading
meters instead.) On an amplified gauge, make sure the +V and ground to
it have good connections.
In my experience, however, on any kind of gauge, the sensor goes bad
much more often than the gauge itself because of the environment in
which it lives. The voltage on sensors is often a "differential"
voltage, meaning it's the difference between the two wires from the
sensor that the gauge reads, not the voltage as referenced from ground.
Some sensors have the amplifier built into them, and they have three or
four wires, in which case you have to contact the manufacturer for the
pinouts and troubleshooting procedure.
(If I knew you had a Westach gauge like mine, I'd run out to the airport
and take some measurements for you.)
Mike Perkins
Message 3
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| Subject: | Re: Altimeter Question |
Ditto on the inaccuracy of GPS altitude. Ditto on the addition of a
static port. My port is about 24" behind the passenger door and about
even with the height of the seat cushion. I chose that location because
it doesn't get beat by the prop wash as much as the other side.
Test flights at 50 feet above a runway indicated that this location
produced no more than 20 feet of altitude difference between Vway-slow
and Vway-fast in my Model I at varying throttle settings.
Mike Perkins
Message 4
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| Subject: | Water temperature guage |
Hi Mike,
Further research:
The gauge is identical to the Westach K36X pictured on ACS:
http://www.aircraftspruce.com/catalog/inpages/westfaa4.php
The sensor appears to be supplied with the Rotax engine:
http://www.aircraftspruce.com/catalog/inpages/umawatertemp1.php
I found a schematic in the build sheets that matched the wiring: very simple
- 12vdc to one terminal, ground to another, the third to the sensor which
goes via very light gauge twisted pair to ground, so it must be a simple
thermistor.
My line of attack is to jumper the +12 and ground wires via a good wire in
case of breakage in the existing ones, and then move the sensor ground to
the ground on the instrument itself, suspecting ground looping. The wiring
is a real rats' nest and I did move a few grounds (not that one) to
re-connect a low-fuel sensor that had been disconnected before I bought the
plane. Come to think of it - I will first disconnect the low fuel sensor,
maybe the guy before me cut it out *because* it caused the temp gauge to
misread!
Mustn't forget my cardinal rule - always undo any changes done since it
worked - first.
Bob Brennan - N717GB
1991 UK Model 2 ELSA Kitfox
Rotax 582 with 3 blade prop
Wrightsville Pa
_____
From: owner-kitfox-list-server@matronics.com
[mailto:owner-kitfox-list-server@matronics.com] On Behalf Of Perkins, Mike
Sent: 26 September 2008 2:22 pm
Subject: Re: Kitfox-List: Water temperature guage
Water temperature gauges are usually "amplified" gauges, meaning they use
ship's power to run a small amplifier that multiplies the thermocouple's
signal many times so that it can produce a reading on the meter. (EGT
thermocouples run many times hotter and therefore produce more voltage, so
they often don't use amplifiers but have direct-reading meters instead.) On
an amplified gauge, make sure the +V and ground to it have good connections.
In my experience, however, on any kind of gauge, the sensor goes bad much
more often than the gauge itself because of the environment in which it
lives. The voltage on sensors is often a "differential" voltage, meaning
it's the difference between the two wires from the sensor that the gauge
reads, not the voltage as referenced from ground. Some sensors have the
amplifier built into them, and they have three or four wires, in which case
you have to contact the manufacturer for the pinouts and troubleshooting
procedure.
(If I knew you had a Westach gauge like mine, I'd run out to the airport and
take some measurements for you.)
Mike Perkins
Message 5
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Having had a model 2 for almost 11 years (crashed 9/5/08 - hoping for insurance
to come thru) with 532, then 582 then blue head 582 I can say go for the power
every time. I don't know of anyone who was carrying a passenger, or even alone
and got into a spot a little (or more) tighter than expected and said to himself
"Gee, I could use a little less power here"!
I have used all the power I had and wished for more on some occasions. I really
liked the oil injection unit. IMO pre-mix is substandard.
STAN 2
N8188F
Message 6
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Maybe some of you won't get this but here goes. When you wrecked your model 2,
did the FEDS ask to see your weight and balance calculations? I like power, but
I like my license more. Based upon most of the responses there is no appreciable
weight advantage, but that was the real nature of my question.
--------
Jeff Dill
Model 2
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 6372#206372
Message 7
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| Subject: | Re: model 7 Fabric at butt rib to fuselage question? |
Have a couple of pic's on our site at expercraft.com/hansedj click on forward
fuselage then dec 26 07 butt ribs. dj series 6
--------
Dj, Series 6
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 6378#206378
Message 8
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| Subject: | Re: model 7 Fabric at butt rib to fuselage question? |
On Fri, September 26, 2008 2:45 pm, hansedj wrote:
>
> Have a couple of pic's on our site at expercraft.com/hansedj click on forward
> fuselage then dec 26 07 butt ribs. dj series 6
The link you give as stated gets a 404 error. After a little digging around I was
able
to find you page. The proper way to reference the page would be something like:
<http://websites.expercraft.com/hansedj/index.php?q=log_entry&log_id=23564>
Your subject line indicates Model 7 but your project is listed as a Model 6 on
the
website.
Looks like nice work. Your subject line suggests a question - what is it?
>
> --------
> Dj, Series 6
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p 6378#206378
>
>
--
Paul A. Franz, P.E.
PAF Consulting Engineers
Office 425.440.9505
Cell 425.241.1618
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