Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 3118387 for flyrotary@lancaironline.net; Wed, 24 Mar 2004 12:53:05 -0500 Received: from edward (clt25-78-058.carolina.rr.com [24.25.78.58]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i2OHr2s2008479 for ; Wed, 24 Mar 2004 12:53:04 -0500 (EST) Message-ID: <000801c411c8$dc5313e0$2402a8c0@edward> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Renesis & RD-1Cdrivetesting Date: Wed, 24 Mar 2004 12:53:05 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C4119E.F3488E60" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C4119E.F3488E60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Even so, Tracy, a HUGE advantage at take off, acceleration and climb are = attractive to me even if top end speed suffered a small bit. I only fly = top speed to see what the top speed is and then normally fly around = 170-180 mph TAS. However, having greater get up and go on take off = (which is the only place spectators would see it anyway {:>)) would be = sufficient to make the switch attractive to me. Assuming, of course, = you don't find any "gotchas" along they way with the 2.85 Ed. =20 Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message -----=20 From: Tracy Crook=20 To: Rotary motors in aircraft=20 Sent: Wednesday, March 24, 2004 11:01 AM Subject: [FlyRotary] Re: Renesis & RD-1Cdrivetesting Charlie's observations are right in line with what I have seen so far. = Still, I would not want to give up the ability to do wheel landings = comfortably. 74" is at the limit for my -4. The -8 or the -4 with the = updated longer gear would not have this problem. The -8 I'm building = will have nothing less than 76" prop and more if I can get it. As I accumulate more hours I clearly see the trend. Huge advantage at = low speeds (acceleration & climb) but advantage diminishes as speed = approached maximum. With the IVO prop (72" dia) I saw the same thing = but the advantage diminished to zero at about 140 mph and then became = negative above that.=20 I still have not run the new drive & prop to top speed. I attempted = to yesterday evening but the dreaded SAG (Sparkplug Attention Getter as = Ed calls it) struck as I was approaching 220 MPH. My best guess is = that the zero point (same performance as with -B drive) is right at this = speed. Things may improve after I get the cuffs built (today's = project). BTW, this -C drive stuff is very encouraging but it's way too early to = close the books on this. One week of testing does not prove anything = about long term effects. It's always the unexpected things that are = the bane of the experimenters' life. The 13B tension bolt problem took = over 1000 hours to show up. I'll be flying on "Orange Alert" status for = hundreds of hours before I feel as comfortable as I did with the -B = drive.=20 Tracy Crook ------=_NextPart_000_0005_01C4119E.F3488E60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Even so, Tracy, a HUGE advantage at take off, = acceleration=20 and climb are attractive to me even if top end speed suffered a small = bit. =20 I only fly top speed to see what the top speed is and then normally fly = around=20 170-180 mph TAS.  However, having greater get up and go on take = off =20 (which is the only place spectators would see it anyway {:>)) = would=20 be sufficient  to make the switch attractive to me.  = Assuming, of course, you don't find any "gotchas" along they way with = the=20 2.85
 
Ed. 
 
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From:=20 Tracy = Crook
Sent: Wednesday, March 24, 2004 = 11:01=20 AM
Subject: [FlyRotary] Re: = Renesis &=20 RD-1Cdrivetesting

Charlie's observations are right in line with what I have seen so = far.   Still, I would not want to give up the ability to do = wheel=20 landings comfortably.  74" is at the limit for my -4.  The = -8 or the=20 -4 with the updated longer gear would not have this = problem.   The=20 -8 I'm building will have nothing less than 76" prop and more if I can = get=20 it.
 
As I accumulate more hours I clearly see the trend.  Huge = advantage=20 at low speeds (acceleration & climb) but advantage diminishes as = speed=20 approached maximum.   With the IVO prop (72" dia) I saw the = same=20 thing but the advantage diminished to zero at about 140 mph and then = became=20 negative above that. 
 
 I still have not run the new drive & prop to top = speed.  I=20 attempted to yesterday evening but the dreaded SAG (Sparkplug = Attention Getter=20 as Ed calls it) struck as I was approaching 220 MPH.   My = best guess=20 is that the zero point (same performance as with -B drive) is right at = this=20 speed.   Things may improve after I get the cuffs built = (today's=20 project).
 
BTW, this -C drive stuff is very encouraging but it's way too = early to=20 close the books on this.  One week of testing does not prove = anything=20 about long term effects.   It's always the = unexpected things=20 that are the bane of the experimenters' life.  The 13B tension = bolt=20 problem took over 1000 hours to show up.  I'll be flying on = "Orange=20 Alert" status for hundreds of hours before I feel as comfortable as I = did with=20 the -B drive. 
 
Tracy Crook
 
 
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