Date: Mon, 28 Aug 2006 22:43:20 -0400
From: Finn Lassen <finn.lassen@verizon.net>
Subject: Re: [FlyRotary] Re: OT: Gardenhose as level
In-reply-to: <list-1353547@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Thank you all for all the answers!

1) Need to add dish soap as water vetter.
2) Flush the entire length to ensure no air and/or spring for 75' of 
clear 1/2" to 3/4" ID PVC hose
3) expand to bigger hose ends
4) possibly protect against wind (was pretty calm this past weekend, so 
probably not a factor.

The ends are 9 feet above slab, and I've tried kicking the hose around 
to dislodge any air bubbles, but still....

Good idea to  "calibrate" the "system" by placing the two ends 
side-by-side for an hour or so. If they don't settle down to exactly the 
same level, I'll know there is air bubbles or something else wrong.

I do have a laser level and also a rotating one. Rotating one says it's 
accurrate to +- 1/4" @ 33 feet.
I find both useless unless I already have reference points at each 
corner (or at least three corners with the rotating one); thus the water 
level.

Finn


Bob Perkinson wrote:

>It is true that the Laser Level is only as good as the method used to level
>it but when you are moving a water level from post to post you will need to
>let the water movement settle out, this takes time.  And there is always the
>possibility of introducing air into the hose or dropping one end and having
>to fill it back up.  A laser level can be set in one central location and
>project an elevation across the complete work area.  Know the elevation of
>the Laser and making measurements from that point is simple.  Of course if
>you want to spend the money there is always an optical surveyors level that
>takes 2 to operate.  I have used both the cheep and the expensive laser
>levels, and the big difference is in the brightness of the laser, and the
>method of support.
>
>Bob Perkinson
>Hendersonville, TN.
>RV9 N658RP Reserved
>If nothing changes
>Nothing changes
>
>
>
>
>
>Bob, I've always wondered how a laser level could be more accurate than a
>water level. I'm not disputing the claim but I've never understood how its
>possible. I'll explain my quandry..  a laser level is only as level as the
>little bubble will make it. I've found some that aren't even close to level
>when they 'say' they are.  A water level [ all things concidered like
>bubbles and wind] will sit perfectly level  once properly set up, we know
>that water will seek its own level. I'm not convinced that a laser level is
>better. Am I missing something??
>
>Curious is all  :)
>
>Jarrett
>
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