X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Received: from mail18.syd.optusnet.com.au ([211.29.132.199] verified) by logan.com (CommuniGate Pro SMTP 5.1.6) with ESMTPS id 1864607 for flyrotary@lancaironline.net; Mon, 26 Feb 2007 16:58:12 -0500 Received-SPF: none receiver=logan.com; client-ip=211.29.132.199; envelope-from=lendich@optusnet.com.au Received: from george (d211-31-118-94.dsl.nsw.optusnet.com.au [211.31.118.94]) by mail18.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id l1QLvGJX019431 for ; Tue, 27 Feb 2007 08:57:18 +1100 Message-ID: <006101c759f1$1715e610$5e761fd3@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: motor mount plate Date: Tue, 27 Feb 2007 07:57:19 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_005C_01C75A44.E797F500" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_005C_01C75A44.E797F500 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bill, Your right again! 93 toothed ring gear with 51 toothed sun gear ( 93/51=3D1.82 +1) =3D = 2.82. Sun gears are (93-51) =3D (42/2) 21 teeth. For those interested in the math and subsequent tooth sizing. Has anyone out there got one of these units that can give me the actual = physical size of the gears!? George 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.=20 Bill Jepson =20 -----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.=20 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=20 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. =20 Lynn E. Hanover -------------------------------------------------------------------------= ----- AOL now offers free email to everyone. Find out more about what's free = from AOL at AOL.com.=20 -------------------------------------------------------------------------= ----- Check out the new AOL. Most comprehensive set of free safety and = security tools, free access to millions of high-quality videos from = across the web, free AOL Mail and more. ------=_NextPart_000_005C_01C75A44.E797F500 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Bill,
Your right again!
93 toothed ring gear with 51 toothed sun gear ( = 93/51=3D1.82=20 +1) =3D 2.82.
Sun gears are (93-51) =3D (42/2) 21 = teeth.
For those interested in the math and subsequent = tooth=20 sizing.
 
Has anyone out there got one of these units that = can give=20 me the actual physical size of the gears!?
George
Lynn,
The planetary in the Mistral PSRU is 2.82:1 (within .01 anyway) = and the=20 gearset is purpose built of spur gearing. I believe they are shooting = for a low=20 prop speed to keep the noise down for Europe. The target RPM  was = 6000=20 when I communicated with Francois some time back.
Bill Jepson
 
 
-----Original Message-----
From:=20 Lehanover@aol.com
To: flyrotary@lancaironline.net
Sent: Mon, 26 = Feb 2007=20 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=20 writes:
As Lynn mentioned Rotaries do = "interesting"=20 things when you get that torque to high.
You ARE using a psru, so the return = torque is a=20 lot higher than what the engine dishes out.
The Mistral-"system" is lot more = "streamlined",=20 than your different front(rear-housing) and PSRU.
It should work just fine, though = depending how=20 much power you send = through...
The Mistral site does not have the PSRU reduction Ratios or the = RPM where=20 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=20 ratio of 2.17
(like the Ford parts) that would give you 2,764 prop RPM ( = supersonic=20 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=20 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=20 ratio of 2.17 that gives you 436 foot pounds at the flange and = into the=20 mounts. For the 2.78 ratio it would be 558 foot pounds at the = flange and=20 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=20 load out through the PSRU bell housing. Or through a plate between the = engine=20 and the PSRU.
 
That 500 HP at 6000 RPM requires 437 foot pounds of torque. = For the=20 2.17 ratio that would be 948 foot pounds at the flange and into the = mounts.=20 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,=20 and probably turning above 6000 so the boost would not have to be = insane. But=20 it can be done.  
 
 
Lynn E. Hanover



AOL now offers free email to everyone. Find out more about what's free = from=20 AOL at AOL.com.
Check out the new AOL. Most comprehensive = set of free=20 safety and security tools, free access to millions of high-quality = videos from=20 across the web, free AOL Mail and = more.
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