X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.3 cv=EuKsUhUA c=1 sm=1 tr=0 a=sv1LXgO2Gz9uSgF+vmu2Og==:117 a=reM5J-MqmosA:10 a=ccVb9X3ndC4A:10 a=r77TgQKjGQsHNAKrUKIA:9 a=htJboqBXAAAA:20 a=UretUmmEAAAA:8 a=_6GpL_ENAAAA:8 a=cGFDJ7Nmzrkh9kwgfQ8A:9 a=QEXdDO2ut3YA:10 a=WWdoAFtmz4sA:10 a=0n9Ua0LSxl_vpW-ML4EA:9 a=hh1fEI3cnp-1OmAN:21 a=_W_S_7VecoQA:10 a=W8ajF5jvLdG4-rt1DGEw:22 From: "Finn Lassen finn.lassen@verizon.net" Received: from sonic313-9.consmr.mail.ne1.yahoo.com ([66.163.185.32] verified) by logan.com (CommuniGate Pro SMTP 6.2.14) with ESMTPS id 753848 for flyrotary@lancaironline.net; Tue, 15 Sep 2020 20:58:24 -0400 Received-SPF: pass receiver=logan.com; client-ip=66.163.185.32; envelope-from=finn.lassen@verizon.net DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=verizon.net; s=a2048; t=1600217887; bh=2vGQAlZ9YrAwCdM/6uCw+TXbg6vmJJb+npK20x/zigM=; h=To:From:Subject:Date:References:From:Subject; b=L7xB5JNysq1+wD3xsn2MGmcp4UAdQj1iNA3wCSYnGR4UTs7GHQAqMpyQuuOpSA5gQRe8DKtpJAsiOuyO/1UVCUn5movbyA1Raty6y2GbVsmXZUfI0mDDC3OGDzesEpVkFa7mFNyGXjiTDwOhpfn+gQp0YYm8hBd2R3XYBOH/kZRFAcJtjPlGSWk503rU4atfPh46tkR6BZ+u9jgPz0qFmIihT2jsjs8ZdGA2OcmZAUilgt1Yc8HDc5uxFo227U4yBRLwbC+emAHoN7aVRsijjr/Qn5iEV+GaxL6jzi7Z/VqFNkUttoMMuQHHOYQmC3qlZMWYnJvEIlAOkh0D8kRVOg== X-YMail-OSG: x61F5tcVM1l1NCrA7yz_cwvBPjy9KmMzoIa4cF5zmV19oVmZHW6N_gOQhFwtdZo b3qT4lW5CCyJ0_9xotIgrq15i5DN5ngJsrqdiD_AAGi8zgOPW4JSPFMM7fMepSNqlJel4w5Ym0DJ UM8wRe.NSnjdN8_XGOzlg1lixIICTVgcjnRMnDbhqRb_.CFC9o4eWdH86gJvs3EZdwPfRA3EBvXC JSED5PUcsffoYdhnpBIaOzqyZTFJ6znjubn0Ny.tu5PYEoPcF_JPSCwzVgpT53Hh0tPjzeLVQ21s .3ZKqA0AcbABNB.njrsUbSaJRGBaH.YY.wasQ_b74hMdD7mqL8oB9tv.y.kI5j9umb0EYCsXsqAP QbPgrVJN_mKn4mQFAk6PjBWWjAB.AL3a04vJ7kCjZs9Y1.itTAjQQ5k8uOKzLW0e0xZodfA6.hGk MbiLk4wauePJMKBxchAhEBQUHtZkZ7AUVhzL.ofiPhsS1_ElYp3Ut_9u35OmSoGs_MJ.nTKi9zLW Ryb_EG6zBWUYdjA184nDnAhTQ89IcTpF0aMZ43fbcpKxkJ9iwKTUwqGNy.ILffXt4JYRlupM0k1_ Xt4SPh.F0kLWakAjOMkHXBdhjxsM4g7kGfs4Mq2m3tc4vGlqQ2a6Xe9wjcuTx_a.OOUgcV_3NkpA MTQSP_epI00BgAFWEt4mAXAlJsmSDHu_xaEeDSI7HugsTnQHBo52kwDi_701NpxzBWMfNLJr81PL 7mIRRfW9i6dHhn5slA6sPz7EhA2IuTqFqJwBII_Oz05lT1N_dMH6rbLxp8i69JUQ.2.nRoatQvmr Ci7_x5obZFAEqscWlhorp0wLGGGFiS8r2OHdl7jTAd4zApUIXLx18aYOAU.0mQNVUQJolm5z5L7A rpT9ITz1xsRCS20l6QGtvz.cHbqKkh7Jm9bi6NgccsSAEG1MuL.cQ7qJ85sRGqhBe16OKoE3sj5s U3N1H.VmEgrPWXkrf55dXRfq6RPpxxiT2bY30GzwouMiPEEHdeftAud3opzWDF.wHx0cJBVms2Wc 8MQEr1ZfqwTzhzGWxF0n_hBLRpGRVIuBOH1LNAoBuMEAT4kDFu9alKJnWiT8EKNtggAT0MyZTbl_ cu2gb7avfJWbnmH1PknmJMd2oiAdhggWoyzO9X.F94XYebIzOwY5_zA34dPPwXj27OnkJShyeB4p nAeuL4XfXBRhKKYsuxrvLxf3IJQYG1.iMh_lwQ26QT8c8a6uP551Hp4J0g0HUWeDKTfW92eQYBR1 MAhcyKurBr_tt08Ot1O42rFiU.7btgK2Q6WBOSPpK8xz6u1NQd7Yk9GFZaZ4paZWC4j_yWVrhxuG YdcGmzZC86ZpyRvB9X7BDgUQ.tQ.YZRQk3rrcqojQ1I3vmE7QNsa8kMKIqu6YzgpXXS7P2YUNwM_ ZfudlIKjEyQZwJV5zZsjx_AsevBasTjdkK_SuUpjNhDFvUWAgpp2ZoFBXgiD5KM4QgiUSLwjCSpW 2v7kFq8loT4YJ8uGisOWG0SZVPnQaNKKOD7DJ5LqFneiGdhILNliz0MrWllnlMw-- Received: from sonic.gate.mail.ne1.yahoo.com by sonic313.consmr.mail.ne1.yahoo.com with HTTP; Wed, 16 Sep 2020 00:58:07 +0000 Received: by smtp419.mail.bf1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 3b04da503a4cfe93d86e6d8c174299e6; Wed, 16 Sep 2020 00:58:05 +0000 (UTC) To: Rotary motors in aircraft Subject: RV-4 prop Message-ID: <37d20944-6272-b120-55b2-7754abf37105@verizon.net> Date: Tue, 15 Sep 2020 20:58:03 -0400 User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="------------8A2F28EB612BF69176DDE820" Content-Language: en-US X-Antivirus: Avast (VPS 200915-12, 09/15/2020), Outbound message X-Antivirus-Status: Clean References: <37d20944-6272-b120-55b2-7754abf37105.ref@verizon.net> X-Mailer: WebService/1.1.16583 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.aol Apache-HttpAsyncClient/4.1.4 (Java/11.0.7) Content-Length: 5958 This is a multi-part message in MIME format. --------------8A2F28EB612BF69176DDE820 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit After sending the below, Ed Sterba replied: "I'm not sure I will be able top make you a prop at this time.  I don't use a duplicating machine, all props are hand carved and I'm getting older and having difficulty carving the bigger ones. Ed" So there goes my plan for a $650 prop. Performance props are now $2,700 according to Bill B. They want $700 to finish his prop (that's normally included in the price). I paid $875 in 1999 for my RV-3 Performance prop, so that 300% inflation. That's going to bust my $20,000 budget. Any ideas for a cheaper prop? I was thinking about building a prop duplicator and duplicating my RV-3B prop (or Tracy's RV-4 prop if I can borrow it). But where does one get 4 3/4" prop blanks or wood? Not sure I trust my ability to laminate wood... Finn Installation will be quite similar to Tracy Crook's RV-4. Here are some of his notes [from https://web.archive.org/web/20111120073159/http://rotaryaviation.com/renesis_engine.htm]: "Clark at Performance Props was very honest about the difficulty in getting the proper pitch at the blade root (out to ~ 3" past the 13" dia. spinner) with pitch this high. [88" ?] Other conclusions are that anything less than 74" L prop is a waste on the -C [2.85:1] drive. I must emphasize that in order for this to work [2.85:1 gear reduction instead of 2.17:1], the prop must not only be long but has to have a good profile as far down toward the root as possible with the MUCH higher pitch.  I worked with Clark at Performance Props and emphasized this.  It required a thicker than standard [4-3/8”] hub to get close to what was needed. If you don't do these things, all you get is significantly higher rpm,  less performance, higher fuel burn and higher wear.  Tracy" --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus --------------8A2F28EB612BF69176DDE820 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit

After sending the below, Ed Sterba replied:

"I'm not sure I will be able top make you a prop at this time.  I don't use a duplicating machine, all props are hand carved and I'm getting older and having difficulty carving the bigger ones.
Ed"

So there goes my plan for a $650 prop.

Performance props are now $2,700 according to Bill B. They want $700 to finish his prop (that's normally included in the price). I paid $875 in 1999 for my RV-3 Performance prop, so that 300% inflation. That's going to bust my $20,000 budget.

Any ideas for a cheaper prop?

I was thinking about building a prop duplicator and duplicating my RV-3B prop (or Tracy's RV-4 prop if I can borrow it). But where does one get 4 3/4" prop blanks or wood? Not sure I trust my ability to laminate wood...

Finn

Installation will be quite similar to Tracy Crook's RV-4.
Here are some of his notes [from https://web.archive.org/web/20111120073159/http://rotaryaviation.com/renesis_engine.htm]:
"Clark at Performance Props was very honest about the difficulty in getting the proper pitch at the blade root (out to ~ 3" past the 13" dia. spinner) with pitch this high. [88" ?]
Other conclusions are that anything less than 74" L prop is a waste on the -C [2.85:1] drive.
I must emphasize that in order for this to work [2.85:1 gear reduction instead of 2.17:1], the prop must not only be long but has to have a good profile as far down toward the root as possible with the MUCH higher pitch.  I worked with Clark at Performance Props and emphasized this.  It required a thicker than standard [4-3/8”] hub to get close to what was needed.
If you don't do these things, all you get is significantly higher rpm,  less performance, higher fuel burn and higher wear.  Tracy"


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