X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 25 Apr 2011 13:13:15 -0400 Message-ID: X-Original-Return-Path: Received: from mta11.charter.net ([216.33.127.80] verified) by logan.com (CommuniGate Pro SMTP 5.4c3j) with ESMTP id 4955915 for lml@lancaironline.net; Sun, 24 Apr 2011 08:49:28 -0400 Received-SPF: pass receiver=logan.com; client-ip=216.33.127.80; envelope-from=toms1@chartermi.net Received: from imp09 ([10.20.200.9]) by mta11.charter.net (InterMail vM.7.09.02.04 201-2219-117-106-20090629) with ESMTP id <20110424124853.PIKR29959.mta11.charter.net@imp09> for ; Sun, 24 Apr 2011 08:48:53 -0400 Received: from beth ([24.231.140.52]) by imp09 with smtp.charter.net id bQos1g00M181idC05QosGu; Sun, 24 Apr 2011 08:48:53 -0400 X-Authority-Analysis: v=1.1 cv=zUqQ2eogioz8lh+3uqjRe4Y1MWSUJU+U3b3PFzAwX18= c=1 sm=1 a=2cP1WIvclh8A:10 a=7Vtkk4Wg9cEA:10 a=6z0E4Jrb22jZ/GE9j9Htdg==:17 a=U-Fe-mWanZ4dCi85AT8A:9 a=9j-OKKySl2-1sK5BcMsA:7 a=wPNLvfGTeEIA:10 a=rKvdWdm5yX_SVL4T:21 a=K3rLy13LEO8sADwy:21 a=MCTDy6GnlAkxRzUDniYA:9 a=ziUWlnhCqLjX7BrAKtAA:7 a=6z0E4Jrb22jZ/GE9j9Htdg==:117 X-Original-Message-ID: From: "Tom & Beth Sullivan" X-Original-To: Subject: Re: IVPT A/C & Aft fuselage area questions X-Original-Date: Sun, 24 Apr 2011 07:49:00 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003B_01CC0254.13415960" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5994 This is a multi-part message in MIME format. ------=_NextPart_000_003B_01CC0254.13415960 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks for the replies. My particular IVP will be powered by a = Walters, so not sure if that has the same CG issues. At any rate, I'm = aware of the aft CG challenge and have been building with that concern = in mind. I eliminated 8 pounds from the rudder counterweight by moving = it forward; even with the leading edge of the vertical (have seen and = talked to others having done the same). That alone should help = considerably with this issue. I also have an entirely pre-preg = enclosure to the wheel well area, which cut the weight of that down from = the "elephant butt" by half. Many turbine builders have added a fuel = tank behind the second row seat; I have not (just the 30 gallon belly = tank). A few others brought up some more things to consider; oxygen tank and = static ports (great points). Any idea what size O2 cylinder is common = and where to purchase it?=20 Still looking for a few pictures of an A/C unit inside the plane (on the = back pressure bulkhead). Thanks much,=20 Tom Bob wrote: Tom,=20 I placed my ELT in the aft fuselage just to the rear of the fuselage = access panel in my IV-P. I also have a TruTrac pitch servo mounted to = the belcrank support structure just behind the MLG wheel well, with its = operating arm linked to the belcrank itself. The TruTrac, and most GA = autopilots, attach servos to the control pushrods, rather than to the = trim tabs. Keep in mind that anything you add behind the wing spar that didn't = come in the kit moves the CG aft. To offset this, I added 1" aluminum = spacers between the engine mount and the firewall to move the engine = forward. Even so, I run out of CG before I get to my (declared and = tested) max weight of 3600#--using any reasonable passenger/baggage = loading plan. I'd seriously consider this mod as you build. IV-Ps tend = to be tail heavy-because most of us homebuilders tend to "overbuild" the = plans a bit.and almost all of it winds up aft of the CG. You are correct to complete all possible build items before installing = the top! 5 times harder to work any interior things with the top on. =20 Bob ------=_NextPart_000_003B_01CC0254.13415960 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

   Thanks for the replies.  My particular = IVP will=20 be powered by a Walters, so not sure if that has the same CG = issues.  At=20 any rate, I'm aware of the aft CG challenge and have been building with = that=20 concern in mind.  I eliminated 8 pounds from the rudder = counterweight by=20 moving it forward; even with the leading edge of the vertical (have seen = and=20 talked to others having done the same).  That alone should help=20 considerably with this issue.  I also have an entirely pre-preg = enclosure=20 to the wheel well area, which cut the weight of that down from the = "elephant=20 butt" by half.  Many turbine builders have added a fuel tank behind = the=20 second row seat; I have not (just the 30 gallon belly = tank).

A few others brought up some more things to = consider; oxygen=20 tank and static ports (great points).  Any idea what size O2 = cylinder is=20 common and where to purchase it?

Still looking for a few pictures of an A/C unit = inside the=20 plane (on the back pressure bulkhead).

Thanks much,

Tom

 

Bob wrote:

Tom,=20

I=20 placed my ELT in the aft fuselage just to the rear of the fuselage = access panel=20 in my IV-P. I also have a TruTrac pitch = servo mounted=20 to the belcrank support structure just = behind the MLG=20 wheel well, with its operating arm linked to the belcrank itself. The TruTrac, and=20 most GA autopilots, attach servos to the control pushrods, rather than = to the=20 trim tabs.

 Keep=20 in mind that anything you add behind the wing spar that didn=92t come in = the kit=20 moves the CG aft.  To = offset this, I=20 added 1=94 aluminum spacers between the engine mount and the firewall to = move the=20 engine forward. Even so, I run out of CG before I get to my (declared = and=20 tested) max weight of 3600#--using any reasonable passenger/baggage = loading=20 plan.  I=92d seriously = consider this=20 mod as you build. IV-Ps tend to be tail heavy=97because most of us = homebuilders=20 tend to =93overbuild=94 the plans a bit=85and almost all of it winds up = aft of the=20 CG.

 You=20 are correct to complete all possible build items before installing the = top! 5=20 times harder to work any interior things with the top=20 on.   =

 Bob

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