X-Virus-Scanned: clean according to Sophos on Logan.com From: "Neil Unger" Received: from nskntmtas05p.mx.bigpond.com ([61.9.168.149] verified) by logan.com (CommuniGate Pro SMTP 6.1.5) with ESMTPS id 7998339 for flyrotary@lancaironline.net; Thu, 17 Sep 2015 23:40:05 -0400 Received-SPF: pass receiver=logan.com; client-ip=61.9.168.149; envelope-from=neil.unger@bigpond.com Received: from nskntcmgw05p ([61.9.169.165]) by nskntmtas05p.mx.bigpond.com with ESMTP id <20150918033928.ENKK25105.nskntmtas05p.mx.bigpond.com@nskntcmgw05p> for ; Fri, 18 Sep 2015 03:39:28 +0000 Received: from UserPC ([58.168.127.99]) by nskntcmgw05p with BigPond Outbound id JTfQ1r00P28oHN201TfRHo; Fri, 18 Sep 2015 03:39:28 +0000 X-Authority-Analysis: v=2.0 cv=IpacgcDg c=1 sm=1 a=FFFx9FrFIolsJRnwuFKMHQ==:17 a=1IlZJK9HAAAA:8 a=Ia-xEzejAAAA:8 a=7g1VtSJxAAAA:8 a=ZN4KUM7nBSXMZojLlxQA:9 a=pILNOxqGKmIA:10 a=Qa1je4BO31QA:10 a=aVLQCBT9bxWUE6NA:21 a=FJnwDWbVmRVxthu1:21 a=vpN9DD7Alxp5ubrQWHMA:9 a=_W_S_7VecoQA:10 a=FFFx9FrFIolsJRnwuFKMHQ==:117 Message-ID: <1F11A248065B484F8F3DD51E1F82257D@UserPC> To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: New psru Date: Fri, 18 Sep 2015 13:39:13 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001C_01D0F217.67D0A140" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 15.4.3555.308 X-MimeOLE: Produced By Microsoft MimeOLE V15.4.3555.308 This is a multi-part message in MIME format. ------=_NextPart_000_001C_01D0F217.67D0A140 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Steve, The test will be to fit to my plane, ground run for 10 hours = min, remove and inspect in fine detail. Then if OK so far , wiull = reassemble and fly for another 40 hours to see if it will fly to bits. = Then a final strip and inspection before I feel confident. All takes = double the time allocated as usual. Neil From: Stephen Izett=20 Sent: Thursday, September 17, 2015 3:20 PM To: Rotary motors in aircraft=20 Subject: [FlyRotary] Re: New psru Hi Neil=20 I was one that benefited from Tracy=92s box, and so appreciate what you = are doing the the community. I once contemplated building my own to save costs! I can now see the huge amount of work required to bring a properly=20 engineered machine that meets its design parameters. Well done, great acheivement. What/how do you plan to test it? Cheers Steve Izett On 17 Sep 2015, at 12:28 pm, Neil Unger = wrote: Gents, Finally the first PSRU with a reduction of 3.12 to 1. = Pictured is the basic box which is heavily based on Tracy=92s PSRU but = with the larger reduction and 2 oil lubricated thrust bearings on the = prop shaft instead of a single sealed roller bearing in Tracy=92s. This = psru will mount directly in place of Tracy's 2.85 reduction PSRU with no = modification. Now to put to test to see if the practice matches the theory. = Already found one fault. The =93O=94 ring seal that seals the main body = of the PSRU to the base that attaches to the mounting plate is outside = all the attachment bolts, which means that the oil can wick down the = bolts and make a lovely mess of your pride and joy. Now looking for = more faults as this is easily fixed. Unlike Tracy's , this PSRU is = totally sealed with O rings to ease dismantling with no clean up of = whatever gasket sealer you have had to use. Now the terrible part and still undecided as I am yet to cost a = damper on the drive. Sadly it also is not cheap and may yet cost near = $500 for a =94bit of rubber=94. Then comes a mounting plate as made by = Geoff Doddridge which he sells for around $400 USD. There is no point = in me trying to compete with Geoff as he does a magnificent job at a = cheap price. Freight is always a horrible price so he makes the plate = and there is no freight from Aust to be added. The total cost in Aust dollars (including Geoff=92s plate) will be = around the $5000 which equates to $3500 USD. Then freight of possibly = $200. Currently looking at further reduction in price if you source the = gear set locally saving on freight both ways to Aust and back. I will = have to alter the way it is constructed so that all the mods can be done = by you the builder. Still looking! So far the progress. Neil. <001 (Small).JPG>-- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_001C_01D0F217.67D0A140 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Steve,   The test will be to fit to my plane, ground run = for 10=20 hours min,  remove and inspect in fine detail.  Then if OK so = far ,=20 wiull reassemble and fly for another 40 hours to see if it will fly to=20 bits.  Then a final strip and inspection before I feel=20 confident.   All takes double the time allocated as = usual. =20 Neil
 
Sent: Thursday, September 17, 2015 3:20 PM
Subject: [FlyRotary] Re: New psru
 
Hi=20 Neil=20
I was one that benefited from Tracy=92s box, and so appreciate what = you are=20 doing the the community.
I once contemplated building my own to save costs!
I can now see the huge amount of work required to bring a properly =
engineered machine that meets its design parameters.
Well done, great acheivement.
What/how do you plan to test it?
 
Cheers
 
Steve Izett
 
On 17 Sep 2015, at 12:28 pm, Neil Unger <flyrotary@lancaironline.net>=20 wrote:
 
Gents,
=
           &n= bsp; =20 Finally the first PSRU with a reduction of 3.12  to 1.  = Pictured is=20 the basic box which is heavily based on Tracy=92s PSRU but with the = larger=20 reduction and 2 oil lubricated thrust   bearings on the prop = shaft=20 instead of a single sealed roller bearing in Tracy=92s.  This = psru will=20 mount directly in place of Tracy's 2.85 reduction PSRU with no=20 modification.
    Now to put to test to see if the practice = matches the=20 theory.  Already found one fault. The =93O=94 ring seal that = seals the main=20 body of the PSRU to the base that attaches to the mounting plate is = outside=20 all the attachment bolts, which means that the oil can wick down the = bolts and=20 make a lovely mess of your pride and joy.  Now looking for more = faults as=20 this is easily fixed.  Unlike Tracy's , this PSRU is totally = sealed with=20 O rings to ease dismantling with no clean up of whatever gasket sealer = you=20 have had to use.
    Now the terrible part and still undecided as I = am yet=20 to cost a damper on the drive.  Sadly it also is not cheap and = may yet=20 cost near $500 for a =94bit of rubber=94.  Then comes a mounting = plate as=20 made by Geoff Doddridge which he sells for around $400 USD.  = There is no=20 point in me trying to compete with Geoff as he does a magnificent job = at a=20 cheap price.  Freight is always a horrible price so he makes the = plate=20 and there is  no freight from Aust to be added.
    The total cost in Aust dollars (including = Geoff=92s=20 plate) will be around the $5000 which equates to $3500 USD.  Then = freight=20 of possibly $200.  Currently looking at further reduction in = price if you=20 source the gear set locally saving on freight both ways to Aust and=20 back.  I will have to alter the way it is constructed so that all = the=20 mods can be done by you the builder.  Still looking!
    So far the progress. =20 Neil.
<001=20 (Small).JPG>--
Homepage:  http://www.flyrotary.com/
Archi= ve and=20 UnSub:   http:= //mail.lancaironline.net:81/lists/flyrotary/List.html
 
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