X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from an-out-0708.google.com ([209.85.132.251] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2084435 for flyrotary@lancaironline.net; Tue, 05 Jun 2007 01:06:41 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.132.251; envelope-from=rotary.thjakits@gmail.com Received: by an-out-0708.google.com with SMTP id b2so350917ana for ; Mon, 04 Jun 2007 22:06:02 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=iVGKgzMkO2p8UuznyTfvcUx1R6TG/CQV7adl4tqOMPSSHVlX4fJubZKN9JTNWKmmTGnh3d7WFl3DIA6ae2WkzZmJmzQlxeZ4HzEsX7DHF1miSgY7oHumqzP5tW/4FbieyhRNZBT2THxE6is3eaUWSDwMPTzYPHz5d3hnl59VWSU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=TDidk63H4X2TWITkzYIDEkymHFj795tzSFyQ3elMmn7ltbgQanmdZ3JQUPX69GTrZCDvt/kYAn3MUB2UAf3m04AkQ/lRLg3qJIjNHMtwuBwnnseVPIa0cFflQ0B+wmNhvLxY1Rx/J+G0xqwZfFYLSje5CMm2YeM/1Tgj4aKHxuQ= Received: by 10.100.42.7 with SMTP id p7mr3014995anp.1181019962301; Mon, 04 Jun 2007 22:06:02 -0700 (PDT) Received: by 10.100.96.15 with HTTP; Mon, 4 Jun 2007 22:06:02 -0700 (PDT) Message-ID: <63163d560706042206g6556a842h11e018a102a3f835@mail.gmail.com> Date: Tue, 5 Jun 2007 00:06:02 -0500 From: "Thomas Jakits" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: Single rotor video In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_20288_1401298.1181019962166" References: ------=_Part_20288_1401298.1181019962166 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline How about a freewheel unit (slipper clutch) - should prevent alt least the reversal part after the power-stroke... Also, visual impact is one thing, that may have NOTHING to do with the actual blade behaviour. Unless you take a strobe and watch, you might get some "funny show" - frame rate of the video, etc. Not a video, and newer pics are better, but as a sample for optical illusions: http://www.pprune.org/forums/showthread.php?t=76347&page=88 ...scroll down about 3/4 to see some TR and MR blades from a Puma (Eurocopter helo), that are "awesome flexible" - "unbelievable" - "new tec" :)) I understand the human eye/brain has also certain resonance frequencies where we see wheels go backwards or stop, so again - a strobe adjusted to the needed frequency will take care of illusions... TJ On 6/4/07, George Lendich wrote: > > Rusty, > I felt I needed to tell you those things ( I've read) as they are indeed > 'counter intuitive' - however your doing the testing, so lets see what > happens. > I intend having 6 of the harder dampers. As you might imagine 6 will make > it a little further out than centre, but not so far out as Tracy's. If I > remember the chap testing the 4 cylinder settled on 5 dampers after testing > 4 of the rubber ones. I though I'd go a step further. > > George ( down under) > > I will leave the video for a couple of days so as to not bog down your > ISP. > > Hi George, > > No need to wait. I have something like 500 GB of traffic limit per month, > but I don't know of any daily limit. > > I've spoken with a couple engineering types about this, and fully believe > that what's required is a very (effectively) soft damper. Using the > Autoflight drive, there is only one bolt-on coupling that fits, and > it's made by Centaflex. This particular coupler only comes in two shore > values, which are 60 and 50. The original was a 60, and the one I got to > test is a 50. One things for sure, it will either be better, worse, or the > same :-) > > Rusty (gyro dangerously close to being finished) > > ------=_Part_20288_1401298.1181019962166 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline
How about a freewheel unit (slipper clutch) - should prevent alt least the reversal part after the power-stroke...
 
Also, visual impact is one thing, that may have NOTHING to do with the actual blade behaviour.
Unless you take a strobe and watch, you might get some "funny show" - frame rate of the video, etc.
 
Not a video, and newer pics are better, but as a sample for optical illusions:
 
 
...scroll down about 3/4 to see some TR and MR blades from a Puma (Eurocopter helo), that are "awesome flexible" - "unbelievable" - "new tec" :))
 
I understand the human eye/brain has also certain resonance frequencies where we see wheels go backwards or stop, so again - a strobe adjusted to the needed frequency will take care of illusions...
 
TJ

 
On 6/4/07, George Lendich <lendich@optusnet.com.au> wrote:
Rusty,
I felt I needed to tell you those things ( I've read) as they are indeed 'counter intuitive' - however your doing the testing, so lets see what happens.
I intend having 6 of the harder dampers. As you might imagine 6 will make it a little further out than centre, but not so far out as Tracy's. If I remember the chap testing the 4 cylinder settled on 5 dampers after testing 4 of the rubber ones. I though I'd go a step further.
 
George ( down under)
 I will leave the video for a couple of days so as to not bog down your ISP. 
 
Hi George,
 
No need to wait.  I have something like 500 GB of traffic limit per month, but I don't know of any daily limit.  
 
I've spoken with a couple engineering types about this, and fully believe that what's required is a very (effectively) soft damper.  Using the Autoflight drive, there is only one bolt-on coupling that fits, and it's made by Centaflex.  This particular coupler only comes in two shore values, which are 60 and 50.  The original was a 60, and the one I got to test is a 50.   One things for sure, it will either be better, worse, or the same :-)
 
Rusty (gyro dangerously close to being finished)

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