X-Virus-Scanned: clean according to Sophos on Logan.com From: "Neil Unger" Received: from nskntmtas03p.mx.bigpond.com ([61.9.168.143] verified) by logan.com (CommuniGate Pro SMTP 6.1.5) with ESMTPS id 7998355 for flyrotary@lancaironline.net; Fri, 18 Sep 2015 00:10:52 -0400 Received-SPF: pass receiver=logan.com; client-ip=61.9.168.143; envelope-from=neil.unger@bigpond.com Received: from nskntcmgw07p ([61.9.169.167]) by nskntmtas03p.mx.bigpond.com with ESMTP id <20150918041015.DXDX26757.nskntmtas03p.mx.bigpond.com@nskntcmgw07p> for ; Fri, 18 Sep 2015 04:10:15 +0000 Received: from UserPC ([58.168.127.99]) by nskntcmgw07p with BigPond Outbound id JUA91r00W28oHN201UAAVD; Fri, 18 Sep 2015 04:10:15 +0000 X-Authority-Analysis: v=2.0 cv=Vsyh8pKn c=1 sm=1 a=FFFx9FrFIolsJRnwuFKMHQ==:17 a=1IlZJK9HAAAA:8 a=Ia-xEzejAAAA:8 a=IFKksG_vjLOOqtFWreIA:9 a=QEXdDO2ut3YA:10 a=7Zwj6sZBwVKJAoWSPKxL6X1jA+E=:19 a=qQqzGe5ePDtxZ6oB:21 a=0RLlwvIb_Ueg8Cod:21 a=SSmOFEACAAAA:8 a=aGQ6dcJnVoduvdW6jWoA:9 a=gKO2Hq4RSVkA:10 a=UiCQ7L4-1S4A:10 a=hTZeC7Yk6K0A:10 a=frz4AuCg-hUA:10 a=KSgTJ8p3FzRaU4Wb:21 a=Q-5bUkFsSCqazJJt:21 a=FFFx9FrFIolsJRnwuFKMHQ==:117 Message-ID: <5F334AF466E1452488CD12125115A0C7@UserPC> To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: New psru Date: Fri, 18 Sep 2015 14:09:59 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0024_01D0F21B.B411AB40" 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_0024_01D0F21B.B411AB40 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Bill, The ratio is either 2.85 or 3.12 depending what gear set you = buy. My experience is that the Lyco give good torque which is good low = speed Hp. the rotary however has little comparative torque and must = compensate with RPM. I bought a prop for 250 Hp and put it on my rotary = with the 2.85 reduction and it killed the rotary. Could only get a = little over 6000 RPM. The rotary real;ly only comes into its own above = 7500 RPM, so I am planning on getting something near 8000 rpm for full = HP. It seems that the rotary must be under proped or it will struggle = to get the HP required. I may be wrong, but that is my experience. From: Bill Bradburry=20 Sent: Thursday, September 17, 2015 10:54 PM To: Rotary motors in aircraft=20 Subject: [FlyRotary] Re: New psru Neil, =20 This is great news for people wanting to install a rotary! I don=E2=80=99t know what drives the selection of a gear ratio, but a = better ratio would be closer to 2.5 to 1. This would make the use of = more standard props easier. With this high a ratio, you will need to = run the engine at high rpm, or the prop will have to turn at a slow = speed requiring a high pitch on the blades. =20 Is the ratio selectable at all? =20 Bill=20 =20 -------------------------------------------------------------------------= ------- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]=20 Sent: Wednesday, September 16, 2015 11:28 PM To: Rotary motors in aircraft Subject: [FlyRotary] New psru =20 Gents, Finally the first PSRU with a reduction of 3.12 to 1. = Pictured is the basic box which is heavily based on Tracy=E2=80=99s 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=E2=80=99s. 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 =E2=80=9CO=E2=80=9D 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 =E2=80=9Dbit of rubber=E2=80=9D. 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=E2=80=99s 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. ------=_NextPart_000_0024_01D0F21B.B411AB40 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Bill,   The ratio is either 2.85 or 3.12 = depending what gear set you buy.  My experience is that the Lyco = give good=20 torque which is good low speed Hp.  the rotary however has little=20 comparative torque and must compensate with RPM.  I bought a prop = for 250=20 Hp and put it on my rotary with the 2.85 reduction and it killed the=20 rotary.  Could only get a little over 6000 RPM.  The rotary = real;ly=20 only comes into its own above 7500 RPM, so I am planning on getting = something=20 near 8000 rpm for full HP.  It seems that the rotary must be under=20 proped  or it will struggle to get the HP required.  I may be = wrong,=20 but that is my experience.
 
Sent: Thursday, September 17, 2015 10:54 PM
Subject: [FlyRotary] Re: New psru
 

Neil,

 

This is great = news for=20 people wanting to install a rotary!

I = don=E2=80=99t know what=20 drives the selection of a gear ratio, but a better ratio would be closer = to 2.5=20 to 1.  This would make the use of more standard props easier.  = With=20 this high a ratio, you will need to run the engine at high rpm, or the = prop will=20 have to turn at a slow speed requiring a high pitch on the=20 blades.

 

Is the ratio = selectable=20 at all?

 

Bill=20

 

From:=20 Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net]
Sent: Wednesday, September 16, = 2015 11:28=20 PM
To: = Rotary motors in aircraft
Subject: [FlyRotary] New=20 psru

 

Gents,

           =   =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=E2=80=99s=20 PSRU but with the larger reduction and 2 oil lubricated = thrust  =20 bearings on the prop shaft instead of a single sealed roller bearing in=20 Tracy=E2=80=99s. =20 This psru will mount directly in place of Tracy's 2.85 reduction PSRU with no=20 modification.

   =20 Now to put to test to see if the practice matches the theory.  = Already=20 found one fault. The =E2=80=9CO=E2=80=9D ring seal that seals the main = body of the PSRU to the=20 base that attaches to the mounting plate is outside all the attachment = bolts,=20 which means that the oil can wick down the bolts and make a lovely mess = of your=20 pride and joy.  Now looking for more faults as this is easily = fixed. =20 Unlike Tracy's ,=20 this PSRU is totally sealed with O rings to ease dismantling with no = clean up of=20 whatever gasket sealer you have had to = use.

   =20 Now the terrible part and still undecided as I am yet to cost a damper = on the=20 drive.  Sadly it also is not cheap and may yet cost near $500 for a = =E2=80=9Dbit of=20 rubber=E2=80=9D.  Then comes a mounting plate as made by Geoff = Doddridge which he=20 sells for around $400 USD.  There is no point in me trying to = compete with=20 Geoff as he does a magnificent job at a cheap price.  Freight is = always a=20 horrible price so he makes the plate and there is  no freight from = Aust to=20 be added.

   =20 The total cost in Aust dollars (including Geoff=E2=80=99s plate) will be = around the=20 $5000 which equates to $3500 USD.  Then freight of possibly = $200. =20 Currently looking at further reduction in price if you source the gear = set=20 locally saving on freight both ways to Aust and back.  I will have = to alter=20 the way it is constructed so that all the mods can be done by you the=20 builder.  Still looking!

   =20 So far the progress. =20 Neil.

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