X-Virus-Scanned: clean according to Sophos on Logan.com From: "Charlie England" Received: from mail-yw0-f181.google.com ([209.85.161.181] verified) by logan.com (CommuniGate Pro SMTP 6.1.11) with ESMTPS id 8823832 for flyrotary@lancaironline.net; Tue, 26 Jul 2016 22:57:32 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.161.181; envelope-from=ceengland7@gmail.com Received: by mail-yw0-f181.google.com with SMTP id j12so44507369ywb.2 for ; Tue, 26 Jul 2016 19:57:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to; bh=v6hXbzANKabSGm9bJ/6nY2WvE8MiwMdR+OJ4NZngk20=; b=eZPgZ4n4GIb4C1y+X1/quoo4jGyOldlTk1iYybJasH/y5T3mF0Uw+FRKtsjcJn+/mB zNQDy4WPQrWM+OLF1E/SQKA1QypIBLWNLFXBd38CyugJ7sxwdVOmGonhRq/sRXwvt+de /pMRQ2Ur8EKdl6rXGatMz4gG5xBLZE5R+Jq9je46dhpGnRCi29iKqPZVsdBKUtBea6E4 LiGT2dWxmI642WGTCsUvb2qPoZ9hKVKk93FUjefc5GypwODrfoJ2BFL8zX0BR2534Z0R IyqQTT7cJOrGlCjxfaORU2J/hnf5ZahsNUyQgCatefiLOJQrS+u/RLHFH+8bcIGUU2rj bYAw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to; bh=v6hXbzANKabSGm9bJ/6nY2WvE8MiwMdR+OJ4NZngk20=; b=P2KfXeR0w0kbk4B6aPeXj3XemMw054p/G9OwnaVapny89vioMDKlSvXIuWlR7vvDz5 fF/5Us44nT3jYr3Ftzcmps7nGzqeiJycKaNkZ09JI6KgpiAJRaqceWdUglONR+edR6EF BVJy0xZY0hEcKENmSQetH13thJCHUt5Z4JbGUxBuFE/baeDtfX8JpADHsPHb/+PJGB3u LR7QS7nB7ZdNiIIUoQ0PYLBNo+rJHnsARoXezPMZ+SbUUPxj3U/GIXPtydVcoErgDvfQ a2aWJLd6Acs59w0YFveJTPWSQvvwj8ORAgcBhJmcMdSkGYGVfDKDdhOqDBSHxhYj17Q1 2P1g== X-Gm-Message-State: AEkoousuB/3i8xsZctXkTPGg9gKtfUBR/ORy4f3+mesIGrz1wvH/DZmiV1zs9vwIo11MQQ== X-Received: by 10.13.237.194 with SMTP id w185mr21354037ywe.140.1469588233710; Tue, 26 Jul 2016 19:57:13 -0700 (PDT) Return-Path: Received: from ?IPv6:2602:306:25fb:1379:2dd0:d3e:d62d:5a0d? ([2602:306:25fb:1379:2dd0:d3e:d62d:5a0d]) by smtp.googlemail.com with ESMTPSA id u187sm2019282ywu.27.2016.07.26.19.57.12 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 26 Jul 2016 19:57:13 -0700 (PDT) Subject: Re: [FlyRotary] New PSRU on the Horizon To: Rotary motors in aircraft References: Message-ID: <345bbdf9-c90c-35de-56bf-50fcd50213bc@gmail.com> Date: Tue, 26 Jul 2016 22:00:32 -0500 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------84684372D43926ACF1BF5E6C" This is a multi-part message in MIME format. --------------84684372D43926ACF1BF5E6C Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit On 7/26/2016 8:41 PM, Kelly Troyer wrote: > Group, > > This will be of interest to the Group.........Randy Kempf of > http://www.rotarpower.com/ in collaboration with > Neil Unger of Australia is gearing up to produce a new PSRU that > would seem to eliminate any weak points > in Tracy Crook's popular RDx searies of PSRU's.........Check out his > website and the PSRU page........ > > Kelly Troyer > > Hi Kelly, Thanks for the update. It's great that a drive will be available again, but it's a shame he chose such a wide ratio. Hardly anyone will want to operate the engine at 8k rpm, and even if they do, it will need a larger diameter prop than most homebuilts can swing safely, due to ground clearance issues. More typical operating rpms down in the 6k range mean sub-1800 prop rpm, which begs an even larger diameter prop. Any chance he'll offer the more conventional 2.85? (Something closer to 2.5 would be even nicer, to get prop rpm closer to the design point for most homebuilt airframe/engine combos.) Charlie --------------84684372D43926ACF1BF5E6C Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit
On 7/26/2016 8:41 PM, Kelly Troyer wrote:
Group,

   This will be of interest to the Group.........Randy Kempf of  http://www.rotarpower.com/ in collaboration with
Neil Unger of Australia is gearing up to produce a new PSRU  that would seem to eliminate any weak points
in Tracy Crook's popular RDx searies of PSRU's.........Check out his website and the PSRU page........  

 
Kelly Troyer


Hi Kelly,

Thanks for the update. It's great that a drive will be available again, but it's a shame he chose such a wide ratio. Hardly anyone will want to operate the engine at 8k rpm, and even if they do, it will need a larger diameter prop than most homebuilts can swing safely, due to ground clearance issues. More typical operating rpms down in the 6k range mean sub-1800 prop rpm, which begs an even larger diameter prop.

Any chance he'll offer the more conventional 2.85? (Something closer to 2.5 would be even nicer, to get prop rpm closer to the design point for most homebuilt airframe/engine combos.)

Charlie
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