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Date: Mon, 28 Aug 2006 13:14:17 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] OT: Gardenhose as level
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Finn Lassen wrote:

> 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)


1) I remember Shady Bend being really windy.  Wouldn't take much 
pressure differential at all to get 1/2" variance.  Maybe try capping 
the ends of the tubes and drilling static ports around the side?

2) I used 1/4" tubing as a water level myself.  With a garden hose, 
maybe you've got so much water in there that it has its own tidal effects.

3) 1/2"!!  Home builders around here call it good if it is withing 
shouting distance!

-- 
         ,|"|"|,              Ernest Christley       |
----===<{{(oQo)}}>===----    Dyke Delta Builder      |
        o|  d  |o        http://ernest.isa-geek.org  |