X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 50 [XX] (67%) URL: contains "http" endcoded (33%) BODY: contains text similar to "no exercising burn fat" 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 1691792 for flyrotary@lancaironline.net; Tue, 19 Dec 2006 13:50:52 -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 kBJInjh6017662 for ; Tue, 19 Dec 2006 13:49:46 -0500 (EST) Message-ID: <002401c7239e$7b2d26b0$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 13:49:57 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0021_01C72374.92088980" 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_0021_01C72374.92088980 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Guess I did, Bill. I know the governor has the pump to do this, its = just I've not found a governor suitable for a rotary engine. Most = require a much slower rpm drive and they are heavy!. Naturally, one = could be machined, modified, etc and a place found on a rotary - but, MY = point was that Tracy was not inclined to do this {:>). I believe he = decided that since there was no ready available governor suitable for = the rotary (and he was not inclined to produce/modify one) that there = was not much point to going to the extra expense of drilling the = required hole. That was my only point. Additionally, with his RV-4 hitting over 2000 fpm ROC with a fix pitch = wooden prop, I would surmise that he probably did see much personal = benefit from adding extra weight, incurring the additional cost of any = type of CS prop. Just my guess of course. Ed ----- Original Message -----=20 From: wrjjrs@aol.com=20 To: Rotary motors in aircraft=20 Sent: Tuesday, December 19, 2006 11:18 AM Subject: [FlyRotary] Re: hydraulic constant speed prop for rotarys 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 =20 =20 -----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,=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 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 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 -------------------------------------------------------------------------= ----- 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_0021_01C72374.92088980 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Guess I did, Bill.  I know = the governor=20 has the pump to do this, its just I've not found a governor suitable for = a=20 rotary engine.  Most require a much slower rpm drive and they are=20 heavy!.  Naturally, one could be machined, modified, etc and a = place found=20 on a rotary - but, MY point was that Tracy was not inclined to do = this=20 {:>).  I believe he decided that since there was no ready = available=20 governor suitable for the rotary (and he was not inclined to = produce/modify one)=20 that there was not much point to going to the extra expense of drilling = the=20 required hole. That was my only point.
 
Additionally, with his RV-4 hitting = over 2000 fpm=20 ROC with a fix pitch wooden prop, I would surmise that he probably did = see much=20 personal benefit from adding extra weight, incurring the additional cost = of any=20 type of CS prop.  Just my guess of course.
 
Ed
----- Original Message -----
From:=20 wrjjrs@aol.com
Sent: Tuesday, December 19, = 2006 11:18=20 AM
Subject: [FlyRotary] Re: = hydraulic=20 constant speed prop for rotarys

Ed,
 You missed the point on this item. The GOVERNOR has the = pump to do=20 this, Tracy need only provide a transfer area for the pressure. = He could=20 do a port into the bearing near the front with a circrumfrencial = groove and a=20 through hole on the shaft under the groove. This can be on the same = bearing=20 surface. This amounts to a small loss of bearing area but not enough = to be a=20 problem.
Bill Jepson  
 
 
-----Original Message-----
From:=20 eanderson@carolina.rr.com
To: flyrotary@lancaironline.net
Sent: = Tue, 19=20 Dec 2006 5:04 AM
Subject: [FlyRotary] Re: hydraulic constant speed = prop for=20 rotarys

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 he=20 didn't want to have to produce a Prop controller to provide the = required oil=20 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:=20 WRJJRS@aol.com=20
To: Rotary=20 motors in 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 runs=20 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 <grdflyguy@yahoo.com>=20 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 SA2=20 hub with Tracys 2.17 RD
The prop is very similar to MT design = except=20 its about
half the price & actuated hydraulically instead = of
electrically. Im the past we havnt had any other CS =
prop=20 options except the electric because we dont
incorporate a = hollow=20 crankshaft as our Lycoming &
Continental cousins . We are = mounting the prop on a
20B in a Lancair ES = however,  it=20 could be just as
easily installed on a 13B as well We will = keep=20 you
posted on our progress

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

Lou  N117ES
 
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.
------=_NextPart_000_0021_01C72374.92088980--