X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from access.aic-fl.com ([204.49.76.2] verified) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 918521 for flyrotary@lancaironline.net; Mon, 09 Jan 2006 09:14:08 -0500 Received-SPF: none receiver=logan.com; client-ip=204.49.76.2; envelope-from=unicorn@gdsys.net Received: from b9k4u9 (unverified [204.49.76.29]) by access.aic-fl.com (Rockliffe SMTPRA 4.5.6) with SMTP id for ; Mon, 9 Jan 2006 08:11:49 -0600 Message-ID: <004b01c61538$718f81e0$1d4c31cc@b9k4u9> From: "Richard Sohn" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] More single rotor running Date: Mon, 9 Jan 2006 08:14:14 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0048_01C614F4.AD88B070" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0048_01C614F4.AD88B070 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Sunday, January 08, 2006 4:29 PM Subject: [FlyRotary] More single rotor running Greetings, Below are the notes from today's adventure. As you'll read, there = are certainly some vibration issues. =20 A question for Richard- Have you run your single rotor with a = realistic sized prop, or just with the drive itself? Have you added any = flywheel weight? =20 Rusty=20 No, Rusty, I have not. However, I agree with Lynn on the fly wheel = being the issue with the torque pulses. My load on the test stand is = direct coupled, via a donut dampener to the load prop. I have the space = in the fly wheel housing to add weight if necessary. For the full size prop with redrive, I have to modify the test stand. = This will happen as soon as I get some relieve from the house building.=20 At the RPM you are talking about, I do not think there is an engine = balance problem. Even with a badly balanced engine, related vibrations = did not show up below 4000RPM on my engine. FWIW Richard Sohn N-2071U ------=_NextPart_000_0048_01C614F4.AD88B070 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message=
 
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Sunday, January 08, 2006 = 4:29=20 PM
Subject: [FlyRotary] More = single rotor=20 running

Greetings,

 

Below are the notes from = today's=20 adventure.    As you'll read, there are certainly some=20 vibration issues. 

 

A question for Richard- = Have you run=20 your single rotor with a realistic sized prop, or just with the drive=20 itself?  Have you added any flywheel weight?  =

 

Rusty

 

No, Rusty, I have not. = However, I=20 agree with Lynn on the fly wheel being the issue with the torque = pulses. My=20 load on the test stand is direct coupled, via a donut dampener to the = load=20 prop. I have the space in the fly wheel housing to add weight if=20 necessary.

For the full size prop = with redrive,=20 I have to modify the test stand. This will happen as soon as I get = some=20 relieve from the house building.

At the RPM you are = talking about, I=20 do not think there is an engine balance problem. Even with a badly = balanced=20 engine, related vibrations did not show up below 4000RPM on my=20 engine.

 

FWIW

 

Richard=20 Sohn
N-2071U

 

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