X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 10 [X] Return-Path: Received: from ms-smtp-04.southeast.rr.com ([24.25.9.103] verified) by logan.com (CommuniGate Pro SMTP 5.1.3) with ESMTP id 1691802 for flyrotary@lancaironline.net; Tue, 19 Dec 2006 13:54:15 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-100-190.carolina.res.rr.com [24.74.100.190]) by ms-smtp-04.southeast.rr.com (8.13.6/8.13.6) with SMTP id kBJIrCID021355 for ; Tue, 19 Dec 2006 13:53:12 -0500 (EST) Message-ID: <002c01c7239e$f631eb20$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: hydraulic constant speed prop for rotarys Date: Tue, 19 Dec 2006 13:53:24 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0029_01C72375.0D1B7EC0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0029_01C72375.0D1B7EC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I understand your point, Hans. But until there is somebody offering a = governor package suitable for mounting on a rotary, I don't think Tracy = is interested in increasing the production cost of drilling the required = hole. Not to say, if someone was really keen on experimenting that = Tracy couldn't be talked into drilling the required hole - but, my guess = is that unless he felt there was a market, he would not be inclined to = add that design feature. But, then I'm not Tracy's marketing manager and could be all wrong about = that {:>) Ed ----- Original Message -----=20 From: Hans Conser=20 To: Rotary motors in aircraft=20 Sent: Tuesday, December 19, 2006 11:20 AM Subject: [FlyRotary] Re: hydraulic constant speed prop for rotarys Tracy doesn't need to build anythinig with a pump, the governor will = do that. We need a psru whose front end matches the current engines = build for a CS prop. The rotary should be good for the as the = "crankshaft" is already hollow and supplied with oil.=20 Hans =20 On 12/19/06, Ed Anderson wrote:=20 Bill,=20 Tracy considered doing that at one point. I believe when he = realized most Hydraulic controlled props required much higher oil = pressure than the 60-70 psi our oil system produces, he decided he = didn't want to have to produce a Prop controller to provide the required = oil pressure. =20 Here is a excerpt from the MT propeller site regarding hydraulic = pressure typically required. The servo pressure necessary for changing pitch is generated by a = gear pump located inside the propeller governor, which increases the oil = pressure supplied by the engine by factor 6 or higher.=20 Ed ----- Original Message -----=20 From: WRJJRS@aol.com=20 To: Rotary motors in aircraft=20 Sent: Monday, December 18, 2006 11:46 PM Subject: [FlyRotary] Re: hydraulic constant speed prop for rotarys =20 Dave, if you go with a Mistral PSRU you can run any Hyd/CS you = want. I'm supprised Tracy hasn't gone to a hollow shaft on his PSRU = since he runs a big plain bearing he could set up a port for a CS prop.=20 Bill Jepson HEY! That's like saying that the store is giving out free ice = cream but not telling us which store.. :-) Dave Leonard =20 On 12/18/06, lou rubin < grdflyguy@yahoo.com> wrote:=20 While we are on the subject of props I want to bring to the groups attention we are installing a constant=20 speed hydraulic prop on a SA2 hub with Tracys 2.17 RD The prop is very similar to MT design except its about half the price & actuated hydraulically instead of electrically. Im the past we havnt had any other CS=20 prop options except the electric because we dont incorporate a hollow crankshaft as our Lycoming & Continental cousins . We are mounting the prop on a 20B in a Lancair ES however, it could be just as easily installed on a 13B as well We will keep you posted on our progress We will be selling our IVO Magnum if there is anyone interested & possibly the 2.17 RD in the future Lou N117ES ------=_NextPart_000_0029_01C72375.0D1B7EC0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I understand your point, Hans.  But until = there is=20 somebody offering a governor package suitable for mounting on a rotary, = I don't=20 think Tracy is interested in increasing the production cost of drilling = the=20 required hole.  Not to say, if someone was really keen on = experimenting=20 that Tracy couldn't be talked into drilling the required hole - but, my = guess is=20 that unless he felt there was a market, he would not be inclined to add = that=20 design feature.
 
But, then I'm not Tracy's marketing manager and = could be=20 all wrong about that {:>)
 
Ed
----- Original Message -----
From:=20 Hans=20 Conser
Sent: Tuesday, December 19, = 2006 11:20=20 AM
Subject: [FlyRotary] Re: = hydraulic=20 constant speed prop for rotarys

Tracy doesn't need to build anythinig with a pump, the governor = will do=20 that.  We need a psru whose front end matches the current engines = build=20 for a CS prop.  The rotary should be good for the as the = "crankshaft" is=20 already hollow and supplied with oil.
 
Hans

 
On 12/19/06, Ed=20 Anderson <eanderson@carolina.rr.com&g= t;=20 wrote:=20
Bill,
 
Tracy considered doing that at one point.  = I believe=20 when he realized most Hydraulic controlled props required much = higher oil=20 pressure  than the 60-70 psi our oil system produces, he = decided=20 he didn't want to have to produce a Prop controller to provide the = required=20 oil pressure. 
 
Here is a excerpt from the MT propeller site = regarding=20 hydraulic pressure typically required.
 
The servo pressure necessary for changing = pitch is=20 generated by a gear pump located inside the propeller=20 governor, which increases the oil pressure supplied = by the=20 engine by factor 6 or = higher.=20
 
Ed
----- Original Message ----- =
From: = WRJJRS@aol.com =
To: Rotary = motors in=20 aircraft
Sent: Monday, December 18, = 2006 11:46=20 PM
Subject: [FlyRotary] Re: = hydraulic=20 constant speed prop for rotarys

 
Dave, if you go with a Mistral PSRU you can run any Hyd/CS = you want.=20 I'm supprised Tracy hasn't gone to a hollow shaft on his PSRU = since he=20 runs a big plain bearing he could set up a port for a CS = prop.
Bill Jepson
HEY!  That's like saying that the store is giving out = free ice=20 cream but not telling us which store..  :-)
 
Dave Leonard

 
On 12/18/06, lou=20 rubin <=20 grdflyguy@yahoo.com> wrote:=20
While=20 we are on the subject of props I want to bring
to the = groups=20 attention we are installing a constant
speed hydraulic = prop on a=20 SA2 hub with Tracys 2.17 RD
The prop is very similar to MT = design=20 except its about
half the price & actuated = hydraulically=20 instead of
electrically. Im the past we havnt had any other = CS=20
prop options except the electric because we = dont
incorporate a=20 hollow crankshaft as our Lycoming &
Continental cousins = . We=20 are mounting the prop on a
20B in a Lancair ES=20 however,  it could be just as
easily installed on = a 13B=20 as well We will keep you
posted on our progress

We = will be=20 selling our IVO Magnum if there is anyone
interested & = possibly=20 the  2.17 RD in the=20 = future

Lou  N117ES
=
 

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