Finn;

I'm betting on bubbles in the hose.  At garden hose diameter, surface
tension effects at the ends would be within your 1/8" objective.  Now with
1/4" tube (Ernest) I would definitely be concerned.

FWIW,

Al

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Finn Lassen
Sent: Monday, August 28, 2006 8:59 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] OT: Gardenhose as level

Only vaugely rotary related...

I'm driving myself nuts trying to build this thing level to within 1/8
to 1/4" !

I'm using a gardenhose, terminating in clear PVC tubing at each end, to
get reference points at the four corners.

The thing is that the level varies 1/2" or more over hours. One end will
be up, 1/2" over where it was an hour ago and the other end down. Then
it changes, etc. How can a guy get a reliable reading this way?

Is the friction in the hose too big to reliably use this as a level?

Do I need to terminate each end in funnels to get bigger ambient pressure?

Finn
(frustrated)