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To: flyrotary@lancaironline.net
Subject: Re: [FlyRotary] Re: motor mount plate
Date: Mon, 26 Feb 2007 12:34:03 -0500
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Lynn,
The planetary in the Mistral PSRU is 2.82:1 (within .01 anyway) and the gearset is purpose built of spur gearing. I believe they are shooting for a low prop speed to keep the noise down for Europe. The target RPM  was 6000 when I communicated with Francois some time back. 
Bill Jepson
 
 
-----Original Message-----
From: Lehanover@aol.com
To: flyrotary@lancaironline.net
Sent: Mon, 26 Feb 2007 6:37 AM
Subject: [FlyRotary] Re: motor mount plate


In a message dated 2/25/2007 7:30:15 P.M. Eastern Standard Time, rijakits@cwpanama.net writes:
As Lynn mentioned Rotaries do "interesting" things when you get that torque to high.
You ARE using a psru, so the return torque is a lot higher than what the engine dishes out.
The Mistral-"system" is lot more "streamlined", than your different front(rear-housing) and PSRU.
It should work just fine, though depending how much power you send through...
The Mistral site does not have the PSRU reduction Ratios or the RPM where they are rating the HP. All very important.
 
For 190 HP at 6,000 RPM you need 168 foot pounds of torque. For a PSRU ratio of 2.17
(like the Ford parts) that would give you 2,764 prop RPM ( supersonic tips or close to it)
And 364 foot pounds at the prop flange and into the engine mounts.
 
For a 2.78 PSRU ratio you would see 467 foot pounds at the prop flange and into the mounts. And 2,158 prop RPM.
 
For 230 HP at 6,000 RPM you need 201 foot pounds of torque. For a PSRU ratio of 2.17 that gives you 436 foot pounds at the flange and into the mounts. For the 2.78 ratio it would be 558 foot pounds at the flange and into the mounts. Prop RPM same as above. 
 
Still no problem.
 
Once you get close to 500 HP, I would be thinking about taking the torque load out through the PSRU bell housing. Or through a plate between the engine and the PSRU.
 
That 500 HP at 6000 RPM requires 437 foot pounds of torque. For the 2.17 ratio that would be 948 foot pounds at the flange and into the mounts. For the 2.78 ratio that would be 
1,214 foot pounds at the flange and into the mounts.
 
Racing Beat built a 900 HP three rotor for a Prescot Pusher. Many turbos, and probably turning above 6000 so the boost would not have to be insane. But it can be done.  
 
 
Lynn E. Hanover


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<div>Lynn,</div>


<div>The planetary in the Mistral PSRU is 2.82:1 (within .01 anyway) and the gearset is purpose built of spur gearing<SPAN contentEditable=false style="DISPLAY: inline-block"></SPAN>. I believe they are shooting for a low prop speed to keep the noise down for Europe. The target RPM&nbsp; was 6000 when I communicated with Francois some time back. </div>


<div>Bill Jepson</div>


<div>&nbsp;</div>
&nbsp;<br>
-----Original Message-----<br>
From: Lehanover@aol.com<br>
To: flyrotary@lancaironline.net<br>
Sent: Mon, 26 Feb 2007 6:37 AM<br>
Subject: [FlyRotary] Re: motor mount plate<br>
<br>

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<div>

<div>In a message dated 2/25/2007 7:30:15 P.M. Eastern Standard Time, <A href='javascript:parent.ComposeTo("rijakits%40cwpanama.net", "");'>rijakits@cwpanama.net</A> writes:</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><FONT face=Arial size=2>As Lynn mentioned Rotaries do "interesting" things when you get that torque to high.</FONT></div>


<div><FONT face=Arial size=2>You ARE using a psru, so the return torque is a lot higher than what the engine dishes out.</FONT></div>


<div><FONT face=Arial size=2>The Mistral-"system" is lot more "streamlined", than your different front(rear-housing) and PSRU.</FONT></div>


<div><FONT face=Arial size=2>It should work just fine, though depending how much power you send through...</FONT></div>
</FONT></BLOCKQUOTE></div>


<div></div>


<div>The Mistral site does not have the PSRU reduction Ratios or the RPM where they are rating the HP. All very important.</div>


<div>&nbsp;</div>


<div>For 190 HP at 6,000 RPM you need 168 foot pounds of torque. For a PSRU ratio of 2.17</div>


<div>(like the Ford parts) that would give you 2,764 prop RPM ( supersonic tips or close to it)</div>


<div>And 364 foot pounds at the prop flange and into the engine mounts.</div>


<div>&nbsp;</div>


<div>For a 2.78 PSRU ratio you would see&nbsp;467 foot pounds at the prop flange and into the mounts. And 2,158 prop RPM.</div>


<div>&nbsp;</div>


<div>For 230 HP at 6,000 RPM you need 201 foot pounds of torque. For a PSRU ratio of 2.17 that gives you&nbsp;436 foot pounds at the flange and into the mounts. For the 2.78 ratio it would be&nbsp;558 foot pounds at the flange and into the mounts. Prop RPM same as above.&nbsp;</div>


<div>&nbsp;</div>


<div>Still no problem.</div>


<div>&nbsp;</div>


<div>Once you get close to 500 HP, I would be thinking about taking the torque load out through the PSRU bell housing. Or through a plate between the engine and the PSRU.</div>


<div>&nbsp;</div>


<div>That 500 HP at 6000 RPM requires 437&nbsp;foot pounds of torque. For the 2.17 ratio that would be 948 foot pounds at the flange and into the mounts. For the 2.78 ratio that would be </div>


<div>1,214 foot pounds at the flange and into the mounts.</div>


<div>&nbsp;</div>


<div>Racing Beat built a 900 HP three rotor for a Prescot Pusher. Many turbos, and probably turning above 6000 so the boost would not have to be insane. But it can be done. &nbsp;</div>


<div>&nbsp;</div>


<div>&nbsp;</div>


<div>Lynn E. Hanover</div>
</FONT><br>
<br>
<br>

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