Return-Path: Received: from [65.54.169.183] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1) with ESMTP id 2512091 for flyrotary@lancaironline.net; Tue, 05 Aug 2003 12:01:23 -0400 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Tue, 5 Aug 2003 09:01:22 -0700 Received: from 67.243.12.198 by bay3-dav153.bay3.hotmail.com with DAV; Tue, 05 Aug 2003 16:01:22 +0000 X-Originating-IP: [67.243.12.198] X-Originating-Email: [lors01@msn.com] Reply-To: "Tracy Crook" From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: tiny tach works, and my plane is a pig Date: Tue, 5 Aug 2003 12:03:03 -0400 Organization: Real World Solutions Inc. MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_008F_01C35B49.861B9280" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Message-ID: X-OriginalArrivalTime: 05 Aug 2003 16:01:22.0817 (UTC) FILETIME=[D1089F10:01C35B6A] This is a multi-part message in MIME format. ------=_NextPart_000_008F_01C35B49.861B9280 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageGlad to hear your -3 is close to flying Rusty. Sorry I fell down = on the job and didn't get your updated chips out before Osh, I'm way = overloaded. Laura has properly scolded me and I'm working on them right = now. Can't wait to hear how a turbo -3 flys, ought to be pretty good = even with those extra pounds. Tracy ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Tuesday, August 05, 2003 10:08 AM Subject: [FlyRotary] Re: tiny tach works, and my plane is a pig Before you go adding weight to the tail - my RV's forward CG = (empty) was 1/8" forward of Van's Limit (in addition to weighing 1170 = lbs). I called Vans to check on the C.G. limit and as long as it was = the "forward" limit there was no concern. They fretted more over my = weight than the C.G.=20 Thanks for the comments. I'm only .3" in front of the forward CG = limit according to my spreadsheet, and it seems that this is a pretty = common problem for people who put O-320 engines in their RV-3's, since = the plane was designed for a 125 hp engine. A friend with an O-320 = RV-3 just told me his empty weight is 822 lbs, and he publishes a gross = weight of 1280, though he keeps aerobatics below Van's recommended 1100 = lb gross. =20 I called Van's yesterday, and talked to one of the engineers that = designed the "B" wings for the RV-3. I am curious to know if they = updated the gross weight limits when they redesigned the wing. = Unfortunately, he probably wasn't at liberty to answer that, and said = he'll ask Van when he gets back from Oshkosh. I'll be surprised if they = raised the limits any, but since the B wing is considered superior to = the old wing, I feel OK about it, especially since everyone seems to be = flying them at higher than recommended gross weight anyway. =20 I'm going to go to the airport today, and make some measurements of = these moment arms that are published in the manual. In particular, I'm = interested in seeing where the single moment arm that they give for the = baggage compartment actually falls. It's a big baggage compartment, and = I'm guessing it's in the middle of that area. Once I confirm those = figures, I can decide what to do. It's quite likely that I won't have = to add any weight at all. Using the general purpose baggage arm that's = given, I can add 6 lb of weight as baggage, and be within the forward CG = limit. Since I'll always carry tie-downs, tools, plugs, and oil (when I = get out of my test period), I'm sure it will add up to 6 pounds. I can = also contain this stuff in the far aft end of the compartment, where it = probably won't even need to weigh 6 pounds to make the CG limit. Bottom = line, it seems like it will all work out OK. =20 Cheers, Rusty (when pigs fly) ------=_NextPart_000_008F_01C35B49.861B9280 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Glad to hear your -3 is close to flying = Rusty.  Sorry I fell down on the job and didn't get your updated = chips out=20 before Osh, I'm way overloaded.  Laura has properly scolded me and = I'm=20 working on them right now.  Can't wait to hear how a turbo -3 flys, = ought=20 to be pretty good even with those extra pounds.
 
Tracy
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Tuesday, August 05, 2003 = 10:08=20 AM
Subject: [FlyRotary] Re: tiny = tach works,=20 and my plane is a pig

    Before you = go adding=20 weight to the tail - my RV's forward CG (empty) was 1/8" forward of = Van's=20 Limit (in addition to weighing 1170 lbs).  I called Vans to check = on the=20 C.G. limit and as long as it was the "forward" limit there was no=20 concern.  They fretted more over my weight than the C.G. 
 
Thanks for the comments.  I'm only .3" = in=20 front of the forward CG limit according to my spreadsheet, = and it=20 seems that this is a pretty common problem for people who put O-320 = engines in=20 their RV-3's, since the plane was designed for a 125 hp=20 engine.   A friend with an O-320 RV-3 just told me his empty = weight=20 is 822 lbs, and he publishes a gross weight of 1280, though he keeps=20 aerobatics below Van's recommended 1100 lb=20 gross.   
 
I called Van's yesterday, and talked to one = of the=20 engineers that designed the "B" wings for the RV-3.  I am = curious to=20 know if they updated the gross weight limits when they redesigned the=20 wing.  Unfortunately, he probably wasn't at liberty to = answer that,=20 and said he'll ask Van when he gets back from Oshkosh.  I'll be=20 surprised if they raised the limits any, but since the B wing=20 is considered superior to the old wing, I feel OK about it, = especially=20 since everyone seems to be flying them at higher than recommended = gross weight=20 anyway.   
 
I'm going to go to the airport today, and = make some=20 measurements of these moment arms that are published in the = manual.  In=20 particular, I'm interested in seeing where the single moment arm that = they=20 give for the baggage compartment actually falls.  It's a big = baggage=20 compartment, and I'm guessing it's in the middle of that = area.  Once=20 I confirm those figures, I can decide what to do.  It's quite = likely that=20 I won't have to add any weight at all.  Using the general purpose = baggage=20 arm that's given, I can add 6 lb of weight as baggage, and be within = the=20 forward CG limit.  Since I'll always carry tie-downs, tools, = plugs, and oil (when I get out of my test period), I'm sure it = will add=20 up to 6 pounds.  I can also contain this stuff in the far aft end = of the=20 compartment, where it probably won't even need to weigh 6 pounds to = make the=20 CG limit.  Bottom line, it seems like it will all work out=20 OK.  
 
Cheers,
Rusty (when pigs = fly) 
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