X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from web81009.mail.mud.yahoo.com ([68.142.199.89] verified) by logan.com (CommuniGate Pro SMTP 5.1c.3) with SMTP id 1353123 for flyrotary@lancaironline.net; Mon, 28 Aug 2006 16:54:20 -0400 Received-SPF: none receiver=logan.com; client-ip=68.142.199.89; envelope-from=deltaflyer@prodigy.net Received: (qmail 53400 invoked by uid 60001); 28 Aug 2006 20:53:41 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=prodigy.net; h=Message-ID:Received:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=aX6tMCLVAjJCJwAtHvBCsAPwWZAP/soTN16GbvnFRk7UXqwS5KTqSrquUcPRKuAgK+fje22+MlIY4cQtmdkbWXcLsOEf4vNi7vGuEdmXc0a4cZXIK7ZoUkL85uP0MXGAT1l7JcA33d4bcSeA8YfwHS8h/sanP199Y4Q3XsGAkTo= ; Message-ID: <20060828205341.53398.qmail@web81009.mail.mud.yahoo.com> Received: from [199.231.49.128] by web81009.mail.mud.yahoo.com via HTTP; Mon, 28 Aug 2006 13:53:40 PDT Date: Mon, 28 Aug 2006 13:53:40 -0700 (PDT) From: James Maher Subject: Re: [FlyRotary] Re: OT: Gardenhose as level To: Rotary motors in aircraft In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-693105278-1156798420=:52998" Content-Transfer-Encoding: 8bit --0-693105278-1156798420=:52998 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit I got one of these Zircon levels years ago for only $14 at Home Depot. http://www.contractor-books.com/ZR/VideoLevel.htm Now they sell for over $40. They are advertised as accurate to +/- 2.25 arc minutes. Probably better than a bubble level. Combine it with a laser pointer for distance and you have a very versatile leveling system. Jim Heidi Johnson wrote: 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 ----- Original Message ----- From: Bob Perkinson Date: Monday, August 28, 2006 1:57 pm Subject: [FlyRotary] Re: OT: Gardenhose as level > Finn, > Spend $35 or $40 at Lowe's or Home Depot and get you a Laser > Level. The > time you will save and the accuracy will more than pay for it. > > Bob Perkinson > Hendersonville, TN. > RV9 N658RP Reserved > If nothing changes > Nothing changes > > > > > > > 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) > > > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ > -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ --0-693105278-1156798420=:52998 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: 8bit
I got one of these Zircon levels years ago for only $14 at Home Depot.
Now they sell for over $40.
They are advertised as accurate to +/- 2.25 arc minutes.
Probably better than a bubble level.
Combine it with a laser pointer for distance and you have a very versatile leveling system.
Jim

Heidi Johnson <hjjohnson@sasktel.net> wrote:
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

----- Original Message -----
From: Bob Perkinson
Date: Monday, August 28, 2006 1:57 pm
Subject: [FlyRotary] Re: OT: Gardenhose as level

> Finn,
> Spend $35 or $40 at Lowe's or Home Depot and get you a Laser
> Level. The
> time you will save and the accuracy will more than pay for it.
>
> Bob Perkinson
> Hendersonville, TN.
> RV9 N658RP Reserved
> If nothing changes
> Nothing changes
>
>
>
>
>
>
> 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)
>
>
>
>
> --
> Homepage: http://www.flyrotary.com/
> Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/
>


--
Homepage: http://www.flyrotary.com/
Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/

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