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To: flyrotary@lancaironline.net
Subject: Re: [FlyRotary] Re: hydraulic constant speed prop for rotarys
Date: Tue, 19 Dec 2006 11:18:49 -0500
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Ed,
 You missed the point on this item. The GOVERNOR has the pump to do this, Tracy need only provide a transfer area for the pressure. He could do a port into the bearing near the front with a circrumfrencial groove and a through hole on the shaft under the groove. This can be on the same bearing surface. This amounts to a small loss of bearing area but not enough to be a problem.
Bill Jepson  
 
 
-----Original Message-----
From: eanderson@carolina.rr.com
To: flyrotary@lancaironline.net
Sent: Tue, 19 Dec 2006 5:04 AM
Subject: [FlyRotary] Re: hydraulic constant speed prop for rotarys


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 <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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<div>Ed,</div>


<div>&nbsp;You missed the point on this item. The GOVERNOR has the pump to do this,&nbsp;Tracy need only provide a transfer area for the pressure. He could do a port into the bearing near the front with a circrumfrencial groove and a through hole on the shaft under the groove. This can be on the same bearing surface. This amounts to a small loss of bearing area but not enough to be a problem.</div>


<div>Bill Jepson&nbsp;&nbsp;</div>


<div>&nbsp;</div>
&nbsp;<br>
-----Original Message-----<br>
From: eanderson@carolina.rr.com<br>
To: flyrotary@lancaironline.net<br>
Sent: Tue, 19 Dec 2006 5:04 AM<br>
Subject: [FlyRotary] Re: hydraulic constant speed prop for rotarys<br>
<br>

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<div><FONT size=3>Bill, </FONT></div>


<div><FONT size=3></FONT>&nbsp;</div>


<div><FONT size=3>Tracy considered doing that at one point.&nbsp; I believe when he realized most Hydraulic controlled props required much higher oil pressure&nbsp; than&nbsp;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.&nbsp; </FONT></div>


<div><FONT size=3></FONT>&nbsp;</div>


<div><FONT size=3>Here is a excerpt from the MT propeller site regarding hydraulic pressure typically required.</FONT></div>


<div><FONT size=3></FONT>&nbsp;</div>


<div>The<STRONG> servo pressure</STRONG> necessary for changing pitch is generated by a gear pump located inside the <STRONG>propeller </STRONG><B>governor</B>, which increases the oil pressure supplied by the engine by <STRONG><FONT color=#ff0000>factor 6 or higher</FONT></STRONG>. </div>


<div><FONT size=3></FONT>&nbsp;</div>


<div><FONT size=3>Ed</FONT></div>

<BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">

<div style="FONT: 10pt arial">----- Original Message ----- </div>


<div style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=WRJJRS@aol.com href="javascript:parent.ComposeTo('WRJJRS@aol.com', '');">WRJJRS@aol.com</A> </div>


<div style="FONT: 10pt arial"><B>To:</B> <A title=flyrotary@lancaironline.net href="javascript:parent.ComposeTo('flyrotary@lancaironline.net', '');">Rotary motors in aircraft</A> </div>


<div style="FONT: 10pt arial"><B>Sent:</B> Monday, December 18, 2006 11:46 PM</div>


<div style="FONT: 10pt arial"><B>Subject:</B> [FlyRotary] Re: hydraulic constant speed prop for rotarys</div>


<div><br>
</div>
<FONT id=role_document face=Arial color=#000000 size=2>

<div>

<div>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&nbsp;CS prop. </div>


<div>Bill Jepson</div>

<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT style="BACKGROUND-COLOR: transparent" face=Arial color=#000000 size=2>

<div>HEY!&nbsp; That's like saying that the store is giving out free ice cream but not telling us which store..&nbsp; :-)</div>


<div>&nbsp;</div>


<div>Dave Leonard<br>
<br>
&nbsp;</div>


<div><SPAN class=gmail_quote>On 12/18/06, <B class=gmail_sendername>lou rubin</B> &lt;<A title=mailto:grdflyguy@yahoo.com href="javascript:parent.ComposeTo('grdflyguy@yahoo.com', '');">grdflyguy@yahoo.com</A>&gt; wrote:</SPAN> 
<BLOCKQUOTE class=gmail_quote style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">While we are on the subject of props I want to bring<br>
to the groups attention we are installing a constant <br>
speed hydraulic prop on a SA2 hub with Tracys 2.17 RD<br>
The prop is very similar to MT design except its about<br>
half the price &amp; actuated hydraulically instead of<br>
electrically. Im the past we havnt had any other CS <br>
prop options except the electric because we dont<br>
incorporate a hollow crankshaft as our Lycoming &amp;<br>
Continental cousins . We are mounting the prop on a<br>
20B in a Lancair ES however,&nbsp;&nbsp;it could be just as<br>
easily installed on a 13B as well We will keep you<br>
posted on our progress<br>
<br>
We will be selling our IVO Magnum if there is anyone<br>
interested &amp; possibly the&nbsp;&nbsp;2.17 RD in the future<br>
<br>
Lou&nbsp;&nbsp;N117ES<br>
</BLOCKQUOTE></div>
</FONT></BLOCKQUOTE></div>


<div></div>


<div>&nbsp;</div>
</BLOCKQUOTE></FONT></div>
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