X-Virus-Scanned: clean according to Sophos on Logan.com From: "Marc Wiese" Received: from mta21.charter.net ([216.33.127.81] verified) by logan.com (CommuniGate Pro SMTP 6.1c4) with ESMTP id 7479462 for flyrotary@lancaironline.net; Tue, 10 Feb 2015 10:56:21 -0500 Received-SPF: pass receiver=logan.com; client-ip=216.33.127.81; envelope-from=cardmarc@charter.net Received: from imp11 ([10.20.200.11]) by mta21.charter.net (InterMail vM.8.01.05.09 201-2260-151-124-20120717) with ESMTP id <20150210155549.OHUB23400.mta21.charter.net@imp11> for ; Tue, 10 Feb 2015 10:55:49 -0500 Received: from mtaout003.msg.strl.va.charter.net ([68.114.190.28]) by imp11 with smtp.charter.net id qfvo1p00B0dCcRg05fvoh0; Tue, 10 Feb 2015 10:55:49 -0500 Received: from impout002 ([68.114.189.17]) by mtaout003.msg.strl.va.charter.net (InterMail vM.9.00.015.01 201-2473-143-101) with ESMTP id <20150210155548.RXSQ15216.mtaout003.msg.strl.va.charter.net@impout002> for ; Tue, 10 Feb 2015 09:55:48 -0600 Received: from HomeDesktop ([97.94.202.172]) by impout002 with charter.net id qfvo1p0093jh26R01fvoG7; Tue, 10 Feb 2015 09:55:48 -0600 X-Authority-Analysis: v=2.1 cv=NrdfcqtJ c=1 sm=1 tr=0 a=xycr6CVXJRVtFs4WRGOeRA==:117 a=xycr6CVXJRVtFs4WRGOeRA==:17 a=hOpmn2quAAAA:8 a=DAwyPP_o2Byb1YXLmDAA:9 a=Zr7miEi8wWIA:10 a=cKsnjEOsciEA:10 a=2oeSqxxVzlsA:10 a=Ia-xEzejAAAA:8 a=suXBRGWYYGhv4FK7gr8A:9 a=QEXdDO2ut3YA:10 a=yMhMjlubAAAA:8 a=SSmOFEACAAAA:8 a=BYvRCSjFkQGdfhHTxL0A:9 a=X_CDSZxMXgDN-_3_:21 a=gKO2Hq4RSVkA:10 a=UiCQ7L4-1S4A:10 a=hTZeC7Yk6K0A:10 a=frz4AuCg-hUA:10 To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: 20B Engines Date: Tue, 10 Feb 2015 09:55:51 -0600 Message-ID: <006001d0454a$0bfd4af0$23f7e0d0$@charter.net> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0061_01D04517.C1654BF0" X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQFnihwKQTM1zInGOmS7nvx0vb31dp27f1TQ Content-Language: en-us This is a multipart message in MIME format. ------=_NextPart_000_0061_01D04517.C1654BF0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable There are 3 series of 20B engines IIRC. The center housing and the crank = on some of the earlier versions was reported to be a weak = link=E2=80=A6=E2=80=A6..later versions had mods to some internal parts. = I have a later version of the 20B. You can tell from the rotor housing = engine numbers (where the 20B is in black surround). Marc =20 From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]=20 Sent: Friday, February 06, 2015 4:17 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: 20B Engines =20 Thanks Mark........That is the info I was looking for............I = happen to have a 13B Cosmo that has the later housings and I had only read about the reinforced housings......... =20 Kelly =20 On Fri, Feb 6, 2015 at 6:49 AM, Mark Steitle = wrote: Kelly,=20 I wouldn't hesitate to use an early 20b. The early 20b housings are = plenty robust enough for a/c use. The beefier irons could be an issue = if you're building a turbo race engine due to the higher loads imposed = during up shifting and down shifting. We don't experience any of those = loads. =20 I'm pretty certain that my 20b is an early model and I have not = experienced any issues with irons cracking around the dowels. The = weakest area is along the inner walls of the o-ring grooves nearest the = water jackets. If your o-rings aren't to factory specs, you run the risk = of cracking an o-ring wall which ruins the housing. Been there, done = that. If you treat the engine with the same care you would a certified = a/c engine, then you won't have any trouble with longevity.=20 Mark =20 On Fri, Feb 6, 2015 at 12:00 AM, Kelly Troyer = wrote: Mark Steitle or other 20B Drivers, =20 I am looking at a 20B that looks to be an early one before they = added additional metal in the dowel/oil passage area of the iron housings because of some = that I have read developed cracks in this area in service in the autos I = presume....... =20 Can you tell me if this a potential problem for the 20B in our = aircraft use ?.......Also can you tell me if your 20B has the later reinforced housings ?......... = =20 =20 --=20 Kelly Troyer =20 =20 =20 ------=_NextPart_000_0061_01D04517.C1654BF0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

There are 3 = series of 20B engines IIRC. The center housing and the crank on some of = the earlier versions was reported to be a weak = link=E2=80=A6=E2=80=A6..later versions had mods to some internal parts. = I have a later version of the 20B. You can tell from the rotor housing = engine numbers (where the 20B is in black = surround).

Marc

 

From:= = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] =
Sent: Friday, February 06, 2015 4:17 PM
To: Rotary = motors in aircraft
Subject: [FlyRotary] Re: 20B = Engines

 

Thanks = Mark........That is the info I was looking for............I happen to = have a 13B Cosmo that has the later housings

and I had only read about the reinforced = housings.........

 

Kelly

 

On Fri, = Feb 6, 2015 at 6:49 AM, Mark Steitle <flyrotary@lancaironline.net> = wrote:

Kelly,

I wouldn't hesitate to = use an early 20b.  The early 20b housings are plenty robust enough = for a/c use.  The beefier irons could be an issue if you're = building a turbo race engine due to the higher loads imposed during up = shifting and down shifting.  We don't experience any of those = loads. 

I'm pretty certain that my 20b is an = early model and I have not experienced any issues with irons cracking = around the dowels.  The weakest area is along the inner walls of = the o-ring grooves nearest the water jackets. If your o-rings aren't to = factory specs, you run the risk of cracking an o-ring wall which ruins = the housing.  Been there, done that.  If you treat the engine = with the same care you would a certified a/c engine, then you won't have = any trouble with longevity.

Mark

 

On Fri, = Feb 6, 2015 at 12:00 AM, Kelly Troyer <flyrotary@lancaironline.net> = wrote:

 Mark Steitle or = other 20B Drivers,

 

     I am looking at a 20B that looks = to be an early one before they added = additional

metal in the = dowel/oil passage area of the iron housings because of some that I = have

read developed cracks = in this area in service in the autos I = presume.......

 

     Can you tell me if this a = potential problem for the 20B in our aircraft use = ?.......Also

can you tell = me if your 20B has the later reinforced housings ?......... =  

 

-- =

Kelly = Troyer

 



 

 

------=_NextPart_000_0061_01D04517.C1654BF0--