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  #14  
Old August 23rd 08, 12:24 PM posted to rec.aviation.soaring
Don Johnstone[_3_]
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Posts: 50
Default PZL compass question

Kate, how lucky can you be. I can supply bubbles of all sizes.
I can also supply:
Think bubbles - Very useful when you are in trouble
Holes - Metric and imperial
Holes, water filled - Useful if you are unwell
Gaps - Metric and imperial, magneto and spark
Rests - for when you feel tired
Ways and plots - For when you loose yours
Bullsh1t - I have a surplus at the moment
Lights - For dim buggers
I am also developing a line in flatulence, varying fragrances - useful
when you meet people you don't like.
I am sorry I am right out of sense, common or otherwise and unlikely to
have new stock in the forseeable future.

Please send £10 sterling ($40) for a full catalogue.



At 08:24 23 August 2008, Glider Kate wrote:
I see 5Z keft his bubble in!

If the compass gets a big bubble inside can you replace the big bubble
with a little one? If so where do you buy them and are they calibrated

for
size and expansion rates?

Are they the same bubbles you get in spirit levels?

K


Ok wher do you buy the bubbles?
Are they calibrated in any way?arted At 02:44 23 August 2008, Darryl

Ramm
wrote:
On Aug 22, 7:07=A0pm, 5Z wrote:
On Aug 22, 7:10=A0pm, Darryl Ramm wrote:

It might blow a gasket if filled all the way due to hot

temperatures
and no expansion space. If it was altitude related leaving a larger
air bubble would make problems due to pressure differential at
altitude worse not better. Right?

That makes sense, but since I've refilled mine, leaving the air

bubble
in there, it hasn't leaked. =A0Go figure.

-Tom


Tom, I was not disagreeing with your instructions, just the reasons
you gave for doing so. My understanding is the air bubble is critical
for fluid thermal expansion on the PZL since unlike some compasses
they have no form of pressure relief diaphragm etc.

Darryl