X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: <13brv3@bellsouth.net> Received: from imf22aec.mail.bellsouth.net ([205.152.59.70] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 1005184 for flyrotary@lancaironline.net; Fri, 17 Jun 2005 11:39:59 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.70; envelope-from=13brv3@bellsouth.net Received: from ibm67aec.bellsouth.net ([65.6.194.9]) by imf22aec.mail.bellsouth.net with ESMTP id <20050617153909.OYLS16779.imf22aec.mail.bellsouth.net@ibm67aec.bellsouth.net> for ; Fri, 17 Jun 2005 11:39:09 -0400 Received: from rd ([65.6.194.9]) by ibm67aec.bellsouth.net with ESMTP id <20050617153909.PTXB11273.ibm67aec.bellsouth.net@rd> for ; Fri, 17 Jun 2005 11:39:09 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: re-drive question for George and Richard Date: Fri, 17 Jun 2005 10:39:09 -0500 Message-ID: <000001c57352$b43e6e30$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C57328.CB686630" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C57328.CB686630 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I'm not trying to compete with Tracy's unit, I'm merely trying to = provide something locally, cost effectively! I would be happy to get down to Tracy's PSRU weight. It's pretty hard to beat the weight of plain bearings. That's about as light as one could get with gear drive, a chain or belt might be lighter.=20 =20 Hi George, =20 I checked around, and couldn't do much better than the RD-1C drive as = far as weight goes. Even belt drives are heavy, so there isn't necessarily any savings there. Fortunately, the Kolb can handle the weight. =20 =20 The lone exception could be Richard's Hirth Drive idea. I'd be = interested in knowing what the all up weight of that is when you add the plate and shaft to attach it to the engine. Have you added all that up Richard? = My guess was that you could save about 10 lbs over Tracy's drive, but it = would require a bunch of custom work, which I'm not necessarily capable of performing. The other unknown is how it will survive with the strong = power pulses of the full size single rotor. =20 =20 =20 By my figuring the one rotor with PSRU will be about 280 to 300 lbs, may = be a little less if your really stingy - I don't know if I'd be too stingy = with the oil though. George ( down under)=20 =20 You might want to check your kg to lbs conversion rates again, mate. If you're just counting the engine, and PSRU, you could probably save some weight by using a stock 13B and Tracy's drive :-) You aren't making = that PP adapter out of lead are you :-) =20 FWIW, my estimate is for a worst case weight of 230 lbs for the total = engine installation using stock housings. I'm pretty sure I can beat that = weight on the Kolb, but I haven't added everything up yet. If anyone ever gets = an aluminum front and rear housing to market, that will save about 25 lbs = as well. =20 Cheers, Rusty (no idea what I'll use for a muffler on the single) =20 =20 =20 ------=_NextPart_000_0001_01C57328.CB686630 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
I'm not trying to compete with Tracy's = unit, I'm=20 merely trying to provide something locally, cost = effectively!
I would be happy to get down = to Tracy's=20 PSRU weight. It's pretty hard to beat the weight of plain=20 bearings.
That's about as light as one = could get with=20 gear drive, a chain or belt might be lighter. 
 
Hi George,
 
I checked around, and couldn't do = much better than=20 the RD-1C drive as far as weight goes.  Even belt drives are heavy, = so=20 there isn't necessarily any savings there.  Fortunately, the Kolb = can=20 handle the weight. 
 
The lone exception could be Richard's = Hirth Drive=20 idea.  I'd be interested in knowing what the all up weight of = that is=20 when you add the plate and shaft to attach it to the engine.  = Have you=20 added all that up Richard?  My guess was that you could save about = 10 lbs=20 over Tracy's drive, but it would require a bunch of custom work, which = I'm not=20 necessarily capable of performing.  The other unknown is how it = will=20 survive with the strong power pulses of the full size single = rotor. =20
 
 
By my figuring the one rotor with PSRU = will be=20 about 280 to 300 lbs, may be a little less if your really stingy - I = don't know=20 if I'd be too stingy with the oil though.
George ( down under) 
 
You might want to check your kg to lbs = conversion rates=20 again, mate.  If you're just counting the engine, and PSRU, = you could=20 probably save some weight by using a stock 13B and Tracy's drive=20 :-)    You aren't making that PP adapter out of = lead=20 are you :-)
 
FWIW, my estimate=20 is for a worst case weight of 230 lbs for the total engine installation = using=20 stock housings.   I'm pretty sure I can beat that weight on = the Kolb,=20 but I haven't added everything up yet.  If anyone ever gets an = aluminum=20 front and rear housing to market, that will save about 25 lbs as=20 well.
 
Cheers,
Rusty (no idea what I'll use for a muffler on = the=20 single) 
 
 
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