X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 10 [X] Return-Path: Received: from wr-out-0506.google.com ([64.233.184.234] verified) by logan.com (CommuniGate Pro SMTP 5.1.3) with ESMTP id 1691277 for flyrotary@lancaironline.net; Tue, 19 Dec 2006 11:21:01 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.233.184.234; envelope-from=hansconser@gmail.com Received: by wr-out-0506.google.com with SMTP id i4so883845wra for ; Tue, 19 Dec 2006 08:20:11 -0800 (PST) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=UjWGnXm4aKPBy/vNYSR4aMbFZ2/ANIYkeQ0IEOkuqKwgNxjpA+OX+3uksJupOiC+R1I4rAiskfoB3kR0wD+FT2WK175koyoTHGliAFJizqRl0XoRjI1gkf5kzl81vxhoKxMkhzwCVOn9yqkij4J1J7OUK5Fuw3UaIYef74QplmI= Received: by 10.90.79.6 with SMTP id c6mr5590691agb.1166545211810; Tue, 19 Dec 2006 08:20:11 -0800 (PST) Received: by 10.90.92.7 with HTTP; Tue, 19 Dec 2006 08:20:11 -0800 (PST) Message-ID: <2e24f88d0612190820u43b5f21wc409afe6e82d430a@mail.gmail.com> Date: Tue, 19 Dec 2006 12:20:11 -0400 From: "Hans Conser" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: hydraulic constant speed prop for rotarys In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_4825_31954691.1166545211748" References: ------=_Part_4825_31954691.1166545211748 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline 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. Hans On 12/19/06, Ed Anderson wrote: > > Bill, > > 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. > > 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*. > > Ed > > ----- Original Message ----- > *From:* WRJJRS@aol.com > *To:* Rotary motors in aircraft > *Sent:* Monday, December 18, 2006 11:46 PM > *Subject:* [FlyRotary] Re: hydraulic constant speed prop for rotarys > > > 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. > Bill Jepson > > HEY! That's like saying that the store is giving out free ice cream but > not telling us which store.. :-) > > Dave Leonard > > > On 12/18/06, lou rubin wrote: > > > > While we are on the subject of props I want to bring > > to the groups attention we are installing a constant > > 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 > > 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 > > > > > ------=_Part_4825_31954691.1166545211748 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline
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.
 
Hans

 
On 12/19/06, Ed Anderson <eanderson@carolina.rr.com> wrote:
Bill,
 
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. 
 
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.
 
Ed
----- Original Message -----
Sent: Monday, December 18, 2006 11:46 PM
Subject: [FlyRotary] Re: hydraulic constant speed prop for rotarys

 
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.
Bill Jepson
HEY!  That's like saying that the store is giving out free ice cream but not telling us which store..  :-)
 
Dave Leonard

 
On 12/18/06, lou rubin < grdflyguy@yahoo.com> wrote:
While we are on the subject of props I want to bring
to the groups attention we are installing a constant
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
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
 

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