Return-Path: Received: from ms-smtp-02.southeast.rr.com ([24.93.67.83] verified) by logan.com (CommuniGate Pro SMTP 4.1b8) with ESMTP id 2455822 for flyrotary@lancaironline.net; Thu, 03 Jul 2003 18:05:28 -0400 Received: from o7y6b5 (clt78-221.carolina.rr.com [24.93.78.221]) by ms-smtp-02.southeast.rr.com (8.12.5/8.12.2) with SMTP id h63M21qQ002487 for ; Thu, 3 Jul 2003 18:02:02 -0400 (EDT) Message-ID: <002301c341b0$4a7d96e0$1702a8c0@WorkGroup> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] First run approaches Date: Thu, 3 Jul 2003 18:13:11 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0020_01C3418E.C3199120" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0020_01C3418E.C3199120 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable A lot of stiffness is added to the fuselage by the two wing struts (when = installed). Without the wing struts the fuselage could start to twist = and untwist with the Lycoming power strokes and should the fuselages = natural resonance frequency be near the rpm you are running it can start = to amplify and can cause the tail to twist sufficiently to cause damage. Since you are not faced with the heavy Lycoming power strokes and the = rpm of the rotary is likely to considerably higher than the Lycoming = (hopefully {:>)) I don't think you will have that problem. However, you = will still have the prop turning in one direction and fuselage trying to = turn in the opposite direction. I would bolt a wooden "fake" spar in = main spar slot with at least a couple of bolts each side and I would = anchor the left side (sitting in pilot's seat) to a ground tie down with = a rope. That would ensure that the CW turning prop (sitting in pilot's = seat) would not be able to turn the aircraft CCW. Good Luck! Is this with turbo on or not? Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Thursday, July 03, 2003 4:51 PM Subject: [FlyRotary] First run approaches Greetings, I'm hoping for a first engine run this weekend, and had a question for = all of you that ran before assembling your planes. Van does not = recommend running Lycoming engines with the wings of the plane removed, = because the power pulses will damage the tail. That shouldn't be a = problem for me, but how about torque? Do I need to be worried at all = about the plane torquing to one side? It doesn't seem likely, but I = thought I'd ask if anyone saw much of a torque effect. This is with the = prop, btw. Thanks,=20 Rusty Turbo 13B powered RV-3 (experimental aircraft)...Be Afraid :-) 1993 RX-7 R1... Not stock, carry bail money :-) ------=_NextPart_000_0020_01C3418E.C3199120 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
A lot of stiffness is added to the = fuselage by the=20 two wing struts (when installed).  Without the wing struts the = fuselage=20 could start to twist and untwist with the Lycoming power strokes and = should the=20 fuselages natural resonance frequency be near the rpm you are running it = can=20 start to amplify and can cause the tail to twist sufficiently to cause=20 damage.
 
Since you are not faced with the heavy = Lycoming=20 power strokes and the rpm of the rotary is likely to considerably higher = than=20 the Lycoming (hopefully {:>)) I don't think you will have that = problem. =20 However, you will still have the prop turning in one direction and = fuselage=20 trying to turn in the opposite direction.  I would bolt a wooden = "fake"=20 spar in main spar slot with at least a couple of bolts each side and I = would=20 anchor the left side (sitting in pilot's seat) to a ground tie down with = a=20 rope.  That would ensure that the CW turning prop (sitting in = pilot's seat)=20 would not be able to turn the aircraft CCW.
 
Good Luck!  Is this with turbo on = or=20 not?
 
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Thursday, July 03, 2003 = 4:51=20 PM
Subject: [FlyRotary] First run=20 approaches

Greetings,

 

I=92m hoping for a first = engine run=20 this weekend, and had a question for all of you that ran before = assembling=20 your planes.  Van does not recommend running Lycoming engines = with the=20 wings of the plane removed, because the power pulses will damage the=20 tail.  That shouldn=92t be a problem for me, but how about=20 torque?   Do I need to be worried at all about the plane = torquing to=20 one side?  It doesn=92t seem likely, but I thought I=92d ask if = anyone saw=20 much of a torque effect.  This is with the prop, = btw.

 

Thanks, =

 

Rusty

Turbo 13B powered RV-3=20 (experimental aircraft)...Be Afraid :-)

1993 RX-7 R1... Not = stock, carry=20 bail money :-)

 

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