X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao104.cox.net ([68.230.241.42] verified) by logan.com (CommuniGate Pro SMTP 5.3.4) with ESMTP id 4171163 for flyrotary@lancaironline.net; Thu, 18 Mar 2010 23:02:09 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.42; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao104.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20100319030134.TWCF29534.fed1rmmtao104.cox.net@fed1rmimpo02.cox.net> for ; Thu, 18 Mar 2010 23:01:34 -0400 Received: from BigAl ([72.192.128.205]) by fed1rmimpo02.cox.net with bizsmtp id ur1a1d0044S1t5C04r1aYi; Thu, 18 Mar 2010 23:01:34 -0400 X-VR-Score: 0.00 X-Authority-Analysis: v=1.1 cv=KqzZVGv1/pIBe+XbL3gCBfL8vaFXECOST7Bs1vfp5Gs= c=1 sm=1 a=iFbdNxPu48EA:10 a=Vegc0WxVmH5BHtpNDyThtA==:17 a=tbtu9-sfbyQJCoaByoEA:9 a=2T_qELBSe_unF4rdK-IEa5g0kgsA:4 a=CjuIK1q_8ugA:10 a=RHdTtDcUTiHnou-6Z9AA:9 a=iG0UjP98dtoA9j7NOLUA:7 a=SHnNOTEcsgq86Mk65cbaV--rhKQA:4 a=Vegc0WxVmH5BHtpNDyThtA==:117 X-CM-Score: 0.00 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: [FlyRolytary] Re: Turbo Considerations....careful, its long Date: Thu, 18 Mar 2010 20:01:08 -0800 Message-ID: <1C7B3A6EEF194B75A94546C167AAEA1B@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0009_01CAC6D5.BFE2B580" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6856 Importance: Normal Thread-Index: AcrG942yQuo+ggtaQuWvoSqWzTIZaQAIKRYg In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_0009_01CAC6D5.BFE2B580 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I know you're fairly entrenched in the 13B approach, but for the sake of = discussion, I'm not sure that's a valid reason. How high do you want to go? I think Tracy's been over 15k with an NA=20 13B. I'd be willing to bet that a Velocity with an NA 20B could get well = over 18k without a problem. =20 As I recall my analysis those many years ago; the cross over point on = power for a turbo-normalized 13B and a NA 20B is at about 13,500' msl. Above = that altitude the torbo 13B will do better. Of course you can boost the 13B = to more than 30" and get more power. =20 Al ------=_NextPart_000_0009_01CAC6D5.BFE2B580 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I know you're fairly entrenched in the 13B approach, but for the sake of =

discussion, I'm not sure that's a valid reason.

How high do you want to go? I think Tracy's been over 15k with = an NA

13B. I'd be willing to bet that a Velocity with an NA 20B could get well =

over 18k without a problem.

 

As I recall = my analysis those many years ago; the cross over point on power for a turbo-normalized 13B and a NA 20B is at about 13,500’ msl.  = Above that altitude the torbo 13B will do better.  Of course you can = boost the 13B to more than 30” and get more power.

 <= /font>

Al

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