X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-d21.mx.aol.com ([205.188.144.207] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2086005 for flyrotary@lancaironline.net; Tue, 05 Jun 2007 17:50:24 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.144.207; envelope-from=Lehanover@aol.com Received: from Lehanover@aol.com by imo-d21.mx.aol.com (mail_out_v38_r9.2.) id q.d13.b32c900 (40520) for ; Tue, 5 Jun 2007 17:49:43 -0400 (EDT) From: Lehanover@aol.com Message-ID: Date: Tue, 5 Jun 2007 17:49:42 EDT Subject: Re: [FlyRotary] Re: Single rotor video To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1181080182" X-Mailer: 9.0 Security Edition for Windows sub 5366 X-Spam-Flag: NO -------------------------------1181080182 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 6/5/2007 1:34:30 P.M. Eastern Daylight Time, bartrim@gmail.com writes: Holy Crap, Rusty, I'm really impressed! I don't think it is just one force involved. When the blade is accelerated violently, the blade hub moves forward and the outer 2/3 or so lags behind a bit. The blade then is hinged in effect at a point about 1/3 of diameter, and since that hinge line is not parallel with the propeller shaft centerline, the tip of the prop moves off its preferred track. It is then amplifying the expected bending of the blade in opposition to the thrust being generated. Try reducing the propeller pitch to nil, so that there is no thrust at all and each blade will be at its stiffest against the acceleration, and deceleration forces. (sell the gyro) Try a different prop. Even thick fixed pitch wood props move fore and aft at the tips in response to thrust. A wood prop would not be acting up like the very light weight and flexible piece you have there. You might try over balancing, or adding weight to the counter weights, and then add just a bit to the very edge of the starter ring. (sell the gyro). I suspect that the problem gets less impressive at higher revs. Lynn E. Hanover ************************************** See what's free at http://www.aol.com. -------------------------------1181080182 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 6/5/2007 1:34:30 P.M. Eastern Daylight Time,=20 bartrim@gmail.com writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>Holy=20 Crap, Rusty, I'm really impressed!
 
 
I don't think it is just one force involved. When the blade is accelera= ted=20 violently, the blade hub moves forward and the outer 2/3 or so lags behind a= =20 bit. The blade then is hinged in effect at a point about 1/3 of diameter, an= d=20 since that hinge line is not parallel with the propeller shaft=20 centerline,  the tip of the prop moves off its preferred track. It= is=20 then amplifying the expected  bending of the blade in opposition t= o=20 the thrust being generated.
 
Try reducing the propeller pitch to nil, so that there is no thrust at=20= all=20 and each blade will be at its stiffest against the acceleration, and=20 deceleration forces. (sell the gyro)
 
Try a different prop.
 
Even thick fixed pitch wood props move fore and aft at the tips in resp= onse=20 to thrust.
 
A wood prop would not be acting up like the very light weight and flexi= ble=20 piece you have there.
 
You might try over balancing, or adding weight to the counter weights,=20= and=20 then add just a bit to the very edge of the starter ring. (sell the=20 gyro). 
 
I suspect that the problem gets less impressive at higher revs.
 
Lynn E. Hanover



See w= hat's free at AOL.= com.
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