X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail09.syd.optusnet.com.au ([211.29.132.190] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTPS id 2642530 for flyrotary@lancaironline.net; Sat, 12 Jan 2008 16:03:48 -0500 Received-SPF: pass receiver=logan.com; client-ip=211.29.132.190; envelope-from=lendich@optusnet.com.au Received: from george (d58-105-136-230.dsl.nsw.optusnet.com.au [58.105.136.230]) by mail09.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id m0CL2x6o010391 for ; Sun, 13 Jan 2008 08:03:03 +1100 Message-ID: <001601c8555e$86c76380$e688693a@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Angles Date: Sun, 13 Jan 2008 07:03:01 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0013_01C855B2.55F21FD0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0013_01C855B2.55F21FD0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks Ed, I will include that in my notes (as usual). The Son worked it out as well, he's the brains in the family, but I = couldn't work out why such an odd degree, for instance why not 6 = degrees!? I clocked it up in the lathe using the dial indicator and tried reading = of the tool holder gauge but it was quite 6 degrees, the marks were a = little worn off as well, which made it harder to read. However Richard Sohn gave the answer, as it's a metric 10:1 taper - = which makes so much more sense. I think Richard might have mentioned = this before, but I might not have been taking notice at the time. Thanks again Ed- and everyone. One more problem solved. George (down under) Hi George, Several folks have responded to your question concerning angles, for = what it is worth I also got 5.729 degrees. There are a couple of formulas you can use. One common approach is to = use=20 ArcSin, but unless you have a convenient ArcSin function available = that can be problematic. So instead I like to use this one for y/r (y being the vertical length = of your angle and r the horizontal length) Degrees =3D y/r * 180/pi = =3D 3/30*180/3.1456 =3D 5.729 deg. This way you don't need a = table/function of ArcSin. Ed ----- Original Message -----=20 From: George Lendich=20 To: Rotary motors in aircraft=20 Sent: Friday, January 11, 2008 7:42 PM Subject: [FlyRotary] Angles Ed, I measured the taper of the flywheel taper with a ruler, the draft = is 3mm in 30mm. I checked that with a dial indicator and it was correct = - how does one derive the angle of that? Is it 6 degrees? George (down under) -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Free Edition.=20 Version: 7.5.516 / Virus Database: 269.19.0/1218 - Release Date: = 10/01/2008 1:32 PM ------=_NextPart_000_0013_01C855B2.55F21FD0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Thanks Ed,

I will include that in my = notes (as=20 usual).

The Son worked it out as well, he's the = brains in=20 the family, but I couldn't work out why such an odd degree, for instance = why not=20 6 degrees!?

I clocked it up in the lathe using the = dial=20 indicator and tried reading of the tool holder gauge but it was quite 6 = degrees,=20 the marks were a little worn off as well, which made it harder to=20 read.

However Richard Sohn gave the answer, = as it's a=20 metric 10:1 taper - which makes so much more sense. I think Richard = might have=20 mentioned this before, but I might not have been taking notice at the=20 time.

Thanks again Ed- and everyone. One more = problem=20 solved.

George (down under)

Hi George,

Several folks have responded to your question = concerning=20 angles, for what it is worth I also got 5.729 degrees.

There are a couple of formulas you can = use. One=20 common approach is to use
ArcSin, but unless you have a = convenient=20 ArcSin function available that can be problematic.

So instead I like to use this one for y/r = (y being=20 the vertical length of your angle and r the horizontal=20 length) Degrees =3D y/r * 180/pi =3D = 3/30*180/3.1456=20 =3D 5.729 deg. This way you = don't need=20 a table/function of ArcSin.

----- Original Message -----
From:=20 George Lendich
To: Rotary motors in = aircraft=20

Sent: Friday, January 11, = 2008 7:42=20 PM

Subject: [FlyRotary] = Angles

Ed,

I measured the taper of the = flywheel taper with=20 a ruler, the draft is 3mm in 30mm. I checked that with a dial = indicator and=20 it was correct - how does one derive the angle of that?

Is it 6 degrees?

George (down = under)

No virus found in this incoming message.
Checked by AVG Free = Edition.
Version: 7.5.516 / Virus Database: 269.19.0/1218 - = Release Date:=20 10/01/2008 1:32 PM
------=_NextPart_000_0013_01C855B2.55F21FD0--