X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from nm14-vm0.access.bullet.mail.mud.yahoo.com ([66.94.236.15] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with SMTP id 5040546 for flyrotary@lancaironline.net; Sat, 02 Jul 2011 09:55:15 -0400 Received-SPF: none receiver=logan.com; client-ip=66.94.236.15; envelope-from=ceengland@bellsouth.net Received: from [66.94.237.199] by nm14.access.bullet.mail.mud.yahoo.com with NNFMP; 02 Jul 2011 13:54:38 -0000 Received: from [66.94.237.109] by tm10.access.bullet.mail.mud.yahoo.com with NNFMP; 02 Jul 2011 13:54:38 -0000 Received: from [127.0.0.1] by omp1014.access.mail.mud.yahoo.com with NNFMP; 02 Jul 2011 13:54:38 -0000 X-Yahoo-Newman-Id: 811318.99730.bm@omp1014.access.mail.mud.yahoo.com Received: (qmail 53433 invoked from network); 2 Jul 2011 13:54:38 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bellsouth.net; s=s1024; t=1309614878; bh=qJ2oGW7zJevt41hRpWa1hFquuVnFdzf2VallsiMECfQ=; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:Date:From:Reply-To:User-Agent:MIME-Version:To:Subject:References:In-Reply-To:Content-Type; b=AZJF8NXLYmNWdT+O7rg0feeES5p2AwmmoNjt6zS52SGjNhU5PEDwYT0E+BSI5XDts1/BjmZdPkP4t/AasLdBPcnBO6atwRH+zide/8RxYAu+7Lu3rROvTXUfHhVP5MC3Yq0zhtV4o0vh6NtgPnkUiskcA8yPKST3ycJ6ejGobJU= Received: from [192.168.10.14] (ceengland@98.95.236.144 with plain) by smtp107.sbc.mail.bf1.yahoo.com with SMTP; 02 Jul 2011 06:54:37 -0700 PDT X-Yahoo-SMTP: uXJ_6LOswBCr8InijhYErvjWlJuRkoKPGNeiuu7PA.5wcGoy X-YMail-OSG: hwCLIkYVM1nlbAhHbt9or_Kqp9NjAhQphRxNMXaisbMhPee oVflKHXETttOsPrDwNUT8pilzqB7gnOYNCfx8kBbeRRbRk2CJKrfT45kVo5Z 3R7t7.Uc0idyvQBygaTFnE24yRjH1XB1Ku8_hrpwIadrPdR.JyPt3EODYqPT lx28WSYapv5FWF1e2h6deZShwvYz_NqR1UPpFu9dBuw0UQziSdG9esyrODBF DJMtAqalt96u3YbyKEteTx3X28NsOt00tyLPuVRWOdWmXrd3eTtommiQeVev 7ZnRGPZ2RHwQma2OcAs94_dK0QDKhaQS6c6ZF7rGB_tZHkjMDDVQQFqg7jyA sTD62WnBloCThpstQN39N6zQC.XNNossANLnmZjPl0lXVo.aPGPe9R4Pke.u LqkCssrnrsONeJM_6_N_W2aHmMP4w5g-- X-Yahoo-Newman-Property: ymail-3 Message-ID: <4E0F231D.3010208@bellsouth.net> Date: Sat, 02 Jul 2011 08:54:37 -0500 From: Charlie England Reply-To: ceengland@bellsouth.net User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110516 Thunderbird/3.1.10 MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Test prop/club needed References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------080401030000030205070305" This is a multi-part message in MIME format. --------------080401030000030205070305 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 07/01/2011 11:30 PM, bktrub@aol.com wrote: > That would definately meet my needs. > Brian Trubee > > > > -----Original Message----- > From: Ernest Christley > To: Rotary motors in aircraft > Sent: Fri, Jul 1, 2011 9:17 pm > Subject: [FlyRotary] Re: Test prop/club needed > > On 06/30/2011 02:14 AM, Andrew Martin wrote: > > Ernest, I thought the calculation for a test club was X section = > > 1/15th of length, means a 90mm square should be 1350mm or 54” in your > > language. mine is 90x1350mm calculated to absorb 190hp@2450rpm. do I > > have this wrong, or do you have a more up to date equation? only > > problem I can see with using a test club is needing supplemental air > > for the heat exchangers or very short runs. > > I used the attached spreadsheet. > > > > > I took the calipers to my dyno-prop today. After the glass and micro, > I have a cross section of 88mm all around. With my 3.18 gear > reduction, it will only absorb 123Hp at 7000 RPM, according to the > spreadsheet. > > The second page suggests having several bars. This one wasn't to hard > to make, so I guess making a few more will be in my future. I need to > get out to 100mm before I'll have a bar that the spreadsheet says will > absorb over 180Hp. > > Brian, I'll be cutting this bar down to 52" (1320mm) tomorrow or > Sunday. With a 2.85 reduction, 6500RPM will require 137Hp to spin the > bar at 2281. > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html Brian, I've got a couple of cut-down props that were originally intended for 160 hp Lyc. RH rotation, 3/8" bolts, should fit Tracy's C gearbox. They were originally good for around 2200 rpm static; they'd be significantly higher now since they were cut down a lot. If you want to use one, just let me know where to ship it. Charlie --------------080401030000030205070305 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit On 07/01/2011 11:30 PM, bktrub@aol.com wrote:
That would definately meet my needs.
 
Brian Trubee



-----Original Message-----
From: Ernest Christley <echristley@att.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Fri, Jul 1, 2011 9:17 pm
Subject: [FlyRotary] Re: Test prop/club needed

On 06/30/2011 02:14 AM, Andrew Martin wrote: 
> Ernest, I thought the calculation for a test club was X section = > 1/15th of length, means a 90mm square should be 1350mm or 54” in your > language. mine is 90x1350mm calculated to absorb 190hp@2450rpm. do I > have this wrong, or do you have a more up to date equation? only > problem I can see with using a test club is needing supplemental air > for the heat exchangers or very short runs. 
> I used the attached spreadsheet. 


I took the calipers to my dyno-prop today. After the glass and micro, I have a cross section of 88mm all around. With my 3.18 gear reduction, it will only absorb 123Hp at 7000 RPM, according to the spreadsheet. 
 
The second page suggests having several bars. This one wasn't to hard to make, so I guess making a few more will be in my future. I need to get out to 100mm before I'll have a bar that the spreadsheet says will absorb over 180Hp. 
 
Brian, I'll be cutting this bar down to 52" (1320mm) tomorrow or Sunday. With a 2.85 reduction, 6500RPM will require 137Hp to spin the bar at 2281. 
 
-- 
Homepage: http://www.flyrotary.com/ 
Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html 
Brian,

I've got a couple of cut-down props that were originally intended for 160 hp Lyc. RH rotation, 3/8" bolts, should fit Tracy's C gearbox. They were originally good for around 2200 rpm static; they'd be significantly higher now since they were cut down a lot.

If you want to use one, just let me know where to ship it.

Charlie
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