X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Received: from elasmtp-masked.atl.sa.earthlink.net ([209.86.89.68] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 1980941 for flyrotary@lancaironline.net; Thu, 12 Apr 2007 03:50:25 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.68; envelope-from=jerryhey@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=f/Wses9QWRy/XjtWFJS0AY46q9uSGBBeNL/LiKMWTnAFi++McGRBKpCg0Zfhv2Sb; h=Received:Mime-Version:In-Reply-To:References:Content-Type:Message-Id:From:Subject:Date:To:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [71.54.80.210] (helo=[192.168.0.101]) by elasmtp-masked.atl.sa.earthlink.net with asmtp (Exim 4.34) id 1Hbu3k-00066J-Ex for flyrotary@lancaironline.net; Thu, 12 Apr 2007 03:49:36 -0400 Mime-Version: 1.0 (Apple Message framework v752.3) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-1-488479817 Message-Id: From: Jerry Hey Subject: Re: [FlyRotary] Re: Mount offset Date: Thu, 12 Apr 2007 03:49:35 -0400 To: "Rotary motors in aircraft" X-Mailer: Apple Mail (2.752.3) X-ELNK-Trace: 8104856d7830ec6b1aa676d7e74259b7b3291a7d08dfec79f4c4d33396334df4aeebf51c1ba6a2af350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 71.54.80.210 --Apple-Mail-1-488479817 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed On Apr 12, 2007, at 1:45 AM, WRJJRS@aol.com wrote: > Bob, Many use the washers method. Built into the mount would be > best. Better yet a truly clever counter rotating prop set would be > super. Then fin offset could also be zero for max efficiency! > Bill Jepson > My kit suggest to install washers between my mount and the firewall > to get the thrust I need. This doesnt sound like a very good way to > do it to me. Is this really the norm for adjusting thrust? > > Bob Mears > Supermarine Spitfire > > -----Original Message----- > From: jerryhey@earthlink.net > To: flyrotary@lancaironline.net > Sent: Wed, 11 Apr 2007 3:22 PM > Subject: [FlyRotary] Re: Mount offset > > Bobby, I am sure we can get it right. I am interested in Blake's > suggestion because I can do the drilling of the S-beam on the mill > where I have more control. We can also do something like you > have just suggested by measuring from a point on the S beam back to > the firewall. And then instead of moving the motor around, I can > just move the firewall. Same thing in reverse. Jerry > > > I have been worrying about accuracy when setting the offset as my > fixture does not have an easy point to measure from. I've > considered a number of schemes in recent weeks. Most would work > but they were not easy to implement. However, the last time the > fixture was rebuilt (when the S-beam was moved to the prop flange a > year ago) I did put in a way to pivot the engine mount at the prop > flange but never used it. All my engine mounts were straight > ahead. Off set could be managed with washers at the firewall. Here is the Dumb part: > For at least two years I have used a laser mounted on the fixture > to make sure it was on thrust line. It fires right down the engine > center line to the "firewall" which has its own center line. I can > move the firewall back and forth, side to side, etc. When the > laser points exactly to the firewall center line everything is > lined up straight ahead. To dial in off set, all I had to do > was mark the calculated offset from the center line on the > firewall and then pivot the fixture until the laser pointed to the > new mark. Honestly, I did not realize I could do it this > perfectly easy way which I myself built, until a hour ago. It is > now 3:30 am and I can finally get some sleep. Jerry > > See what's free at AOL.com. > --Apple-Mail-1-488479817 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1
On Apr 12, 2007, = at 1:45 AM, WRJJRS@aol.com = wrote:

My kit suggest to install washers between my mount and the = firewall to get the thrust I need. This doesnt sound like a very good = way to do it to me. Is this really the norm for adjusting = thrust?
=A0
Bob Mears
Supermarine = Spitfire
=A0
-----Original Message-----
From: jerryhey@earthlink.netTo: flyrotary@lancaironline.net
Sent: Wed, 11 Apr 2007 3:22 PM
Subject: [FlyRotary] = Re: Mount offset

Bobby,=A0 =A0I am sure we can get it right.=A0 I am interested = in Blake's suggestion because I can do the drilling of the S-beam on the = mill where I have more control. =A0 =A0We can also do something like you = have just suggested by measuring from a point on the S beam back to the = firewall. =A0 =A0And then instead of moving the motor around, I can just = move the firewall.=A0 =A0Same thing in reverse.=A0 = Jerry

I have been worrying about accuracy when = setting the offset as my fixture does not have an=A0 easy point to = measure=A0 from. =A0 I've considered a number of=A0 schemes in recent=A0 = weeks.=A0 Most would work but they were not easy to implement.=A0 = However, the last time the fixture was rebuilt (when the S-beam was = moved to the prop flange a year ago)=A0 I did put in a way to pivot the = engine mount at the prop flange but never used it. =A0 =A0All my engine = mounts were straight ahead.=A0 Off set=A0 could be managed with washers = at the firewall.=A0=A0
Here is the Dumb = part:

=A0For at least = two years I have used a laser=A0 mounted on the fixture to make sure it = was=A0 on thrust line. It fires right down the engine center line to the = "firewall" which has its own center line. I can move the firewall back = and forth, side to side, etc.=A0 When the laser points exactly to the = firewall center line everything is lined up straight ahead.=A0 =A0To = dial in off set,=A0 all I had to do was=A0 mark the calculated=A0 offset = from the center line on the firewall and then pivot the fixture until = the laser pointed to the new mark.=A0 Honestly, =A0 I=A0 did not realize = I could do it this perfectly easy way which I myself built,=A0 until a = hour ago.=A0 It is now 3:30 am and I can finally get some sleep. =A0 = Jerry=A0



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