X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Received: from elasmtp-kukur.atl.sa.earthlink.net ([209.86.89.65] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 1980078 for flyrotary@lancaironline.net; Wed, 11 Apr 2007 16:23:44 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.65; envelope-from=jerryhey@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=UddrdpdZMbCHbVMiO/rpjeqUy7uS237nx6W6dCz77gg+K7mcistEiPqZYfWa4UP4; 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-kukur.atl.sa.earthlink.net with asmtp (Exim 4.34) id 1HbjLG-0005Le-9Y for flyrotary@lancaironline.net; Wed, 11 Apr 2007 16:22:58 -0400 Mime-Version: 1.0 (Apple Message framework v752.3) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-11-447281840 Message-Id: <65698854-A643-4B6D-BED7-9094FC383728@earthlink.net> From: Jerry Hey Subject: Re: [FlyRotary] Re: Mount offset Date: Wed, 11 Apr 2007 16:22:57 -0400 To: "Rotary motors in aircraft" X-Mailer: Apple Mail (2.752.3) X-ELNK-Trace: 8104856d7830ec6b1aa676d7e74259b7b3291a7d08dfec79dec19c45d5312bd908ee8cac29a34d70350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 71.54.80.210 --Apple-Mail-11-447281840 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed 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 On Apr 11, 2007, at 5:05 PM, Bobby J. Hughes wrote: > >> Your correct Ernest. I should have specified an RV. I think all of >> the >> RV's are designed the same. I have read somewhere it is 1.25 degrees. >> Just trying to confirm. >> >> Bobby >> >> The direction of the engine offset, and any fin offset would also >> depend on the direction of propeller rotation. The fin and engine >> offset must agree. >> >> >> Lynn E. Hanover > > Also, you might ask your engine mount builder if he can truly > resolve a quarter of a degree. I am sure he is pondering this > issue and wondering the same :) Jerry >> My simple (hanger engineering) approach would be to draw a >> straight line the length of the left side tubes. This should be a >> known length. Then using a protractor draw another line the same >> length at a 1.25 degree offset. Measure the difference at the end >> of the lines. Then draw a line 47.5 inches (firewall to C-drive >> face) and repeat with a 1.25 degree offset. Measure the >> difference and subtract first set of measurements. That should >> provide a good estimate for how much shorter to make the right >> side tubes. Washers could be use for fine tuning if needed. The >> flying RV10's seem to be as much as 1/2 ball out to the right in >> cruse. Not sure how much it would be without the offset. It does >> vary with airspeed. Some are installing rudder trim. Van's mounts >> have the offset build in. Tracy also has offset built into his RV8 >> mount. I think it is needed to make the plane fly correctly. >> >> Bobby >> >> >> >> See what's free at AOL.com. > --Apple-Mail-11-447281840 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1 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


On Apr 11, = 2007, at 5:05 PM, Bobby J. Hughes wrote:

=A0
Your correct Ernest. I should have specified an RV. I = think all of the
RV's are designed the same. I have read = somewhere it is 1.25 degrees.
Just trying to = confirm.

Bobby

=
The direction of the engine offset, and any fin offset would also = depend on the direction of propeller rotation. The fin and engine = offset must agree.
=A0
=A0
Lynn E. Hanover
=

Also, you might ask = your engine mount builder if he can truly=A0 resolve a quarter of a = degree.=A0 =A0I am sure he is pondering this issue=A0 and wondering=A0 = the same=A0 :)=A0 =A0Jerry
My simple (hanger = engineering) approach would be to draw a straight line the length of = the left side tubes.=A0This should be a known length. Then using a = protractor draw another line=A0the same length at a=A01.25 degree = offset.=A0 Measure the difference at the end of the lines. Then draw a = line 47.5 inches (firewall to C-drive face) and repeat with a 1.25 = degree offset. =A0Measure the difference and subtract=A0first set of = =A0measurements. That should provide a good estimate for how much = shorter to make the right side tubes. Washers could be use for fine = tuning if needed. The flying RV10's seem to be as much as 1/2 ball=A0out= to the right in cruse. Not sure how much it would be without the = offset. It does vary with airspeed.=A0Some are installing rudder = trim.=A0=A0Van's mounts have the offset build in. Tracy also has = offset built into his=A0RV8 mount.=A0I think it is needed to make the = plane fly correctly.=A0
=A0
Bobby
=A0=A0


= See what's free at AOL.com. =


= --Apple-Mail-11-447281840--