X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-01.southeast.rr.com ([24.25.9.100] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2083467 for flyrotary@lancaironline.net; Mon, 04 Jun 2007 12:54:15 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.100; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-01.southeast.rr.com (8.13.6/8.13.6) with SMTP id l54GrVUC002450 for ; Mon, 4 Jun 2007 12:53:32 -0400 (EDT) Message-ID: <001201c7a6c9$594bb6c0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Single rotor video Date: Mon, 4 Jun 2007 12:56:51 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000F_01C7A6A7.D1E91090" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_000F_01C7A6A7.D1E91090 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageHi Rusty,=20 Regarding the EC2 - just how to you have it set up to run the one rotor = - one primary and one secondary - one injector only, two? =20 Ed ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Monday, June 04, 2007 12:12 PM Subject: [FlyRotary] Re: Single rotor video I wonder if having only one rotor if torque reversal between firing = pulse might have more of an effect at slower rpm in loading/unloading = prop blades than at higher. =20 Hi Ed, No doubt at all that slower speed is the main problem. If I = understand this all correctly, what's needed is enough inertia to carry = through the compression stroke without slowing down significantly. At = higher rpms, the rotating mass has enough inertia to take care of the = problem, but at lower rpms, a flywheel would be needed. The weight of = the flywheel would be determined by how low you want to go in rpm. =20 Adding weight is sort of the brute force way to fix it, but it could = also be fixed by adding enough damping to absorb the speed changes. My = understanding is that I need something really soft, and even the softest = damper I can get is probably not going to work as well as I'd like it = to. With any luck though, it will be good enough to get around 2000 rpm = for "idle". =20 BTW, to make everyone feel better, my EC-2 is doing something I = haven't been able to explain either. I have to run with cold start on = to have enough fuel to run, which would imply that I'm only getting half = the fuel I'm supposed to get with it off. I'm sure I've goofed = something up, and I haven't really taken the time to figure it out yet, = but I do have a small Holley carb on the way to test as well :-) Rusty ------=_NextPart_000_000F_01C7A6A7.D1E91090 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Hi Rusty,
 
Regarding the EC2 - just how to you have it set = up to run=20 the one rotor - one primary and one secondary - one injector only, = two? =20
 
Ed
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Monday, June 04, 2007 = 12:12=20 PM
Subject: [FlyRotary] Re: Single = rotor=20 video

I wonder if having only one rotor if torque = reversal=20 between firing pulse might have more of an effect at slower rpm in=20 loading/unloading prop blades than at higher.   
 
Hi=20 Ed,
 
No=20 doubt at all that slower speed is the main problem.  If I = understand this=20 all correctly, what's needed is enough inertia to carry through the=20 compression stroke without slowing down significantly.  At higher = rpms,=20 the rotating mass has enough inertia to take care of the problem, but = at lower=20 rpms, a flywheel would be needed.  The weight of the flywheel = would be=20 determined by how low you want to go in=20 rpm.  
 
Adding=20 weight is sort of the brute force way to fix it, but it could also be = fixed by=20 adding enough damping to absorb the speed changes.  My = understanding is=20 that I need something really soft, and even the softest damper I can = get is=20 probably not going to work as well as I'd like it to.  With any = luck=20 though, it will be good enough to get around 2000 rpm for = "idle". =20
 
BTW, to=20 make everyone feel better, my EC-2 is doing something I haven't been = able to=20 explain either.  I have to run with cold start on to have enough = fuel to=20 run, which would imply that I'm only getting half the fuel I'm = supposed to get=20 with it off.  I'm sure I've goofed something up, and I haven't = really=20 taken the time to figure it out yet, but I do have a small Holley carb = on the=20 way to test as well :-)
 
Rusty=20
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