Cambridge Model 20 Issues

I am (I think) a proud owner of a model 20 which is driving me up the
wall. Yesterday, I was flying our clubs Discus B with my logger
attached under the glare shield. On my flight, after I was off of tow,
the recorder recorded what looked and was shown as engine noise. The
engine noise also showed up in flight for a couple of minutes. A
friend of mine asked if I had the gear down during my initial climb
and I did. I also dropped the gear to drain my bladder once. My logger
is translating engine noise for gear doors open. Am I the only one
with this problem? Is there a sensativity adjustment that can be done?
I have the question posted to Cambridge but they are close now so I
figured I would see if someone out there had the answer faster.
Thanks
Brian Iten
17

Any significant noise (e.g. high speed, gear down,
spoilers) may show as engine noise on the flight log
but it's apparent to anyone reading the trace that
engine noise while sinking isn't really from a motor
on.

At 23:48 05 April 2004, B. Iten wrote:
I am (I think) a proud owner of a model 20 which is
driving me up the
wall. Yesterday, I was flying our clubs Discus B with
my logger
attached under the glare shield. On my flight, after
I was off of tow,
the recorder recorded what looked and was shown as
engine noise. The
engine noise also showed up in flight for a couple
of minutes. A
friend of mine asked if I had the gear down during
my initial climb
and I did. I also dropped the gear to drain my bladder
once. My logger
is translating engine noise for gear doors open. Am
I the only one
with this problem? Is there a sensativity adjustment
that can be done?
I have the question posted to Cambridge but they are
close now so I
figured I would see if someone out there had the answer
faster.
Thanks
Brian Iten
17

B. Iten wrote:

I am (I think) a proud owner of a model 20 which is driving me up the
wall. Yesterday, I was flying our clubs Discus B with my logger
attached under the glare shield. On my flight, after I was off of tow,
the recorder recorded what looked and was shown as engine noise. The
engine noise also showed up in flight for a couple of minutes. A
friend of mine asked if I had the gear down during my initial climb
and I did. I also dropped the gear to drain my bladder once. My logger
is translating engine noise for gear doors open. Am I the only one
with this problem? Is there a sensativity adjustment that can be done?
I have the question posted to Cambridge but they are close now so I
figured I would see if someone out there had the answer faster.

What you describe is normal and proper operation of the recorder, unless
the values are very high. On my glider, gear down is around 40-50 units,
engine noise is over 200.

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Eric Greenwell
Washington State
USA

X-no-archive: yes
In article , Eric Greenwell
writes
B. Iten wrote:

I am (I think) a proud owner of a model 20 which is driving me up the
wall. Yesterday, I was flying our clubs Discus B with my logger
attached under the glare shield. On my flight, after I was off of tow,
the recorder recorded what looked and was shown as engine noise. The
engine noise also showed up in flight for a couple of minutes. A
friend of mine asked if I had the gear down during my initial climb
and I did. I also dropped the gear to drain my bladder once. My logger
is translating engine noise for gear doors open. Am I the only one
with this problem? Is there a sensativity adjustment that can be done?
I have the question posted to Cambridge but they are close now so I
figured I would see if someone out there had the answer faster.

What you describe is normal and proper operation of the recorder, unless
the values are very high. On my glider, gear down is around 40-50 units,
engine noise is over 200.

Are you sure about ENL of over 200?

Although the range of possible values is 0-999, on the Model 10/20/25
only values between 0 and 195 are recorded (in the .IGC file).

It would be interesting to see the .IGC file.

Best regards,

Tim Newport-Peace

"May you be cursed with a chronic anxiety about the weather."

John Burroughs (1837-1921).

Singing and talking also show up on the noise recorder of my vox logger.


"Eric Greenwell" wrote in message
...
B. Iten wrote:

I am (I think) a proud owner of a model 20 which is driving me up the
wall. Yesterday, I was flying our clubs Discus B with my logger
attached under the glare shield. On my flight, after I was off of tow,
the recorder recorded what looked and was shown as engine noise. The
engine noise also showed up in flight for a couple of minutes. A
friend of mine asked if I had the gear down during my initial climb
and I did. I also dropped the gear to drain my bladder once. My logger
is translating engine noise for gear doors open. Am I the only one
with this problem? Is there a sensativity adjustment that can be done?
I have the question posted to Cambridge but they are close now so I
figured I would see if someone out there had the answer faster.

What you describe is normal and proper operation of the recorder, unless
the values are very high. On my glider, gear down is around 40-50 units,
engine noise is over 200.

--
-----
change "netto" to "net" to email me directly

Eric Greenwell
Washington State
USA

(B. Iten) wrote in message . com...
I am (I think) a proud owner of a model 20 which is driving me up the
wall. Yesterday, I was flying our clubs Discus B with my logger
attached under the glare shield. On my flight, after I was off of tow,
the recorder recorded what looked and was shown as engine noise. The
engine noise also showed up in flight for a couple of minutes. A
friend of mine asked if I had the gear down during my initial climb
and I did. I also dropped the gear to drain my bladder once. My logger
is translating engine noise for gear doors open. Am I the only one
with this problem? Is there a sensativity adjustment that can be done?
I have the question posted to Cambridge but they are close now so I
figured I would see if someone out there had the answer faster.
Thanks
Brian Iten
17

Probably normal. I used to use my Model 25 ENL trace to confirm tow
release point. There was a large reduction in noise when the gear
door closed on my ASW 19. In that glider the ENL reached levels that
indicated engine run several time during a flight.


I see similar effects with my ENL 302.


Andy

Tim Newport-Peace wrote:
X-no-archive: yes
In article , Eric Greenwell
writes

B. Iten wrote:


I am (I think) a proud owner of a model 20 which is driving me up the
wall. Yesterday, I was flying our clubs Discus B with my logger
attached under the glare shield. On my flight, after I was off of tow,
the recorder recorded what looked and was shown as engine noise. The
engine noise also showed up in flight for a couple of minutes. A
friend of mine asked if I had the gear down during my initial climb
and I did. I also dropped the gear to drain my bladder once. My logger
is translating engine noise for gear doors open. Am I the only one
with this problem? Is there a sensativity adjustment that can be done?
I have the question posted to Cambridge but they are close now so I
figured I would see if someone out there had the answer faster.

What you describe is normal and proper operation of the recorder, unless
the values are very high. On my glider, gear down is around 40-50 units,
engine noise is over 200.


Are you sure about ENL of over 200?

Although the range of possible values is 0-999, on the Model 10/20/25
only values between 0 and 195 are recorded (in the .IGC file).

It would be interesting to see the .IGC file.

I was looking at the files with the old Cambridge DOS viewer, which does
show values to 400 for both the original CAI file and the post-flight
generated IGC file. The newer viewers (Cambridge's Aero Explorer and
Seeyou) seem to rescale the values to a full scale of 195 for both file
formats. I should have asked Brian which viewer he was using, but I
didn't realize the CAI values were being rescaled.

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Eric Greenwell
Washington State
USA

Brian Iten's file with the high noise reading in on the OLC site for
April 4, if anyone wants to look at it.


Eric Greenwell wrote:

Tim Newport-Peace wrote:

X-no-archive: yes
In article , Eric Greenwell
writes

B. Iten wrote:


I am (I think) a proud owner of a model 20 which is driving me up the
wall. Yesterday, I was flying our clubs Discus B with my logger
attached under the glare shield. On my flight, after I was off of tow,
the recorder recorded what looked and was shown as engine noise. The
engine noise also showed up in flight for a couple of minutes. A
friend of mine asked if I had the gear down during my initial climb
and I did. I also dropped the gear to drain my bladder once. My logger
is translating engine noise for gear doors open. Am I the only one
with this problem? Is there a sensativity adjustment that can be done?
I have the question posted to Cambridge but they are close now so I
figured I would see if someone out there had the answer faster.


What you describe is normal and proper operation of the recorder,
unless the values are very high. On my glider, gear down is around
40-50 units, engine noise is over 200.


Are you sure about ENL of over 200?

Although the range of possible values is 0-999, on the Model 10/20/25
only values between 0 and 195 are recorded (in the .IGC file).

It would be interesting to see the .IGC file.


I was looking at the files with the old Cambridge DOS viewer, which does
show values to 400 for both the original CAI file and the post-flight
generated IGC file. The newer viewers (Cambridge's Aero Explorer and
Seeyou) seem to rescale the values to a full scale of 195 for both file
formats. I should have asked Brian which viewer he was using, but I
didn't realize the CAI values were being rescaled.

Thanks for posting where to see the file at Greg. I guess the next
question to this issue will be what will happen if during a badge or
record flight, you drop the gear to water the desert? With the engine
noise being recorded, will this affect your claim?
Brian
17

Brian Iten wrote:

Thanks for posting where to see the file at Greg. I guess the next
question to this issue will be what will happen if during a badge or
record flight, you drop the gear to water the desert? With the engine
noise being recorded, will this affect your claim?
Brian

It's not an issue unless you are flying a motorglider, then the flight
evaluators must determine if it was caused by the engine or other
sources. Generally, this isn't hard to do.

Just be sure your Official Observer can tell the difference between a
Discus B and a Discus BT!

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Eric Greenwell
Washington State
USA