X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 15 Feb 2013 07:45:49 -0500 Message-ID: X-Original-Return-Path: Received: from [198.64.152.110] (HELO sdc.com) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTP id 6065083 for lml@lancaironline.net; Fri, 15 Feb 2013 02:07:03 -0500 Received-SPF: pass receiver=logan.com; client-ip=198.64.152.110; envelope-from=ronald@sdc.com Received: from RONALD.local [68.202.61.147] by sdc.com with ESMTP (SMTPD-12.2.0.235) id b83200011c5728ca; Thu, 14 Feb 2013 17:32:57 -0500 X-Original-Message-ID: <511D6707.3070502@sdc.com> X-Original-Date: Thu, 14 Feb 2013 17:36:55 -0500 From: Ronald Stevens User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:17.0) Gecko/20130107 Thunderbird/17.0.2 MIME-Version: 1.0 X-Original-To: Lancair Mailing List Subject: Re: [LML] Full feather prop vs high pitch References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------000102060501050100090605" This is a multi-part message in MIME format. --------------000102060501050100090605 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi Ron I will have test results and perhaps a video of operation as well once it is installed. From what I know is that the prop will only go to reverse when the rpm drops below 1250rpm. The prop I have right now does about 1200rpm on landing, so I could engage this right than, but even after 1 second it should be enough to stop the plane easier and using less runway and less brakes. I do not intend to full blast reverse (unless there is an emergency), so keeping prop and skin damages under control. The W&B yes that will be an issue as it seems that my prop right now is 20lbs heavier...so I just cut off a part of the tail lol == Ronald On 2/14/13 2:48 PM, Ron Galbraith wrote: > It seems the discussion on the full feathering prop and non full > feathering prop vs drag has kind of missed the whole point behind the > full feathering prop. The full feathering prop will go to full > feather when you lose all oil pressure, and the standard prop will go > to minimum pitch (high drag) configuration with the lose of oil > pressure. The Prop governors work opposite and are not > interchangeable. The best of both worlds is the "counter weighted" > prop. This prop goes to full coarse pitch with the loss of oil > pressure and uses the same gov. at the full feathering prop. I have > the 4 blade MT Prop counter weighted and I know Brent Regan and Bob > Pastusek have them as well as others, but I'd bet most of the folks > out there didn't even know they existed. > I will be very interested to see how the full reversing prop works > that Ronald just ordered. I'm sure you can go full feather as well as > reverse and even if it takes a few seconds to get to reverse, in most > cases this would be enough time say in case there was ice on the > runway. It's always very handy to back up from time to time too. The > weight of the reversing prop will be quite a bit lighter than the full > feather metal prop though, so there might be some W&B issues in a IVP. > > Ron --------------000102060501050100090605 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit

Hi Ron

I will have test results and perhaps a video of operation as well once it is installed. From what I know is that the prop will only go to reverse when the rpm drops below 1250rpm. The prop I have right now does about 1200rpm on landing, so I could engage this right than, but even after 1 second it should be enough to stop the plane easier and using less runway and less brakes.

I do not intend to full blast reverse (unless there is an emergency), so keeping prop and skin damages under control.

The W&B yes that will be an issue as it seems that my prop right now is 20lbs heavier...so I just cut off a part of the tail lol

== Ronald

On 2/14/13 2:48 PM, Ron Galbraith wrote:

It seems the discussion on the full feathering prop and non full feathering prop vs drag has kind of missed the whole point behind the full feathering prop. The full feathering prop will go to full feather when you lose all oil pressure, and the standard prop will go to minimum pitch (high drag) configuration with the lose of oil pressure. The Prop governors work opposite and are not interchangeable. The best of both worlds is the "counter weighted" prop. This prop goes to full coarse pitch with the loss of oil pressure and uses the same gov. at the full feathering prop. I have the 4 blade MT Prop counter weighted and I know Brent Regan and Bob Pastusek have them as well as others, but I'd bet most of the folks out there didn't even know they existed.
I will be very interested to see how the full reversing prop works that Ronald just ordered. I'm sure you can go full feather as well as reverse and even if it takes a few seconds to get to reverse, in most cases this would be enough time say in case there was ice on the runway. It's always very handy to back up from time to time too. The weight of the reversing prop will be quite a bit lighter than the full feather metal prop though, so there might be some W&B issues in a IVP.

Ron

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