X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml Date: Tue, 24 Nov 2009 06:20:32 -0500 Message-ID: X-Original-Return-Path: Received: from mail-pz0-f202.google.com ([209.85.222.202] verified) by logan.com (CommuniGate Pro SMTP 5.3c2) with ESMTP id 3986890 for lml@lancaironline.net; Mon, 23 Nov 2009 14:38:07 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.222.202; envelope-from=bobatbmackey@gmail.com Received: by pzk40 with SMTP id 40so3978684pzk.7 for ; Mon, 23 Nov 2009 11:37:33 -0800 (PST) DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:content-type; b=LEp8VIne6JUK/EiKvvQbA6+KRyEfxaEbcGRpIOpZ3K9vfPHdbdp8C5ryyZPuVU9UP7 CqrghncvsvVE/+XeRzjw3/N290fP99G2KP2oCAKykxlYQNWhib/cPTaTZsUjQiiFxCR3 IrQgFeovmlcqHBYKK9yQghBbkdHxYkKGGDLSg= MIME-Version: 1.0 X-Original-Sender: bobatbmackey@gmail.com Received: by 10.140.164.9 with SMTP id m9mr293265rve.239.1259005053680; Mon, 23 Nov 2009 11:37:33 -0800 (PST) In-Reply-To: References: X-Original-Date: Mon, 23 Nov 2009 20:37:33 +0100 X-Google-Sender-Auth: f712f6484603f17d X-Original-Message-ID: Subject: Fwd: overspeed From: bob mackey X-Original-To: lml@lancaironline.net Content-Type: text/plain; charset=ISO-8859-1 John Barrett asks: > ...but my question is how could the RPM remain at 3300 > when the throttle is brought back to idle, if indeed the MAP > dropped to an idle or near idle condition. If the airspeed was high enough, a flat prop would windmill at 3300 rpm. The horsepower necessary to spin the engine at 3300 rpm was being supplied by the airflow through the prop disc. That would definitely put the brakes on. As the airspeed drops, the prop need not spin so fast, so eventually it slows down. If you want to reduce the airspeed and rpm quickly, pull up into a steep climb. Nose over before it gets too slow of course. Good luck on avoiding any related engine damage. Will you be sending it back to Continental for teardown and inspection? I don't know if 3300rpm is enough to stretch the connecting rods, but it is under warranty, right? -bob [Marv: please delete my prior message from the wrong address]