X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.3 cv=EuKsUhUA c=1 sm=1 tr=0 a=xfWM1RdXaBQK0jEnrOT6iQ==:117 a=reM5J-MqmosA:10 a=qTk-3YOPqoMA:10 a=r77TgQKjGQsHNAKrUKIA:9 a=o1OHuDzbAAAA:8 a=yMhMjlubAAAA:8 a=Ia-xEzejAAAA:8 a=htJboqBXAAAA:20 a=UretUmmEAAAA:8 a=_6GpL_ENAAAA:8 a=vP0lJhJCCyRqpY0Uef4A:9 a=ckTsdxJMZ18FBppZ:21 a=l7qaVvJw06tzue4m:21 a=QEXdDO2ut3YA:10 a=WWdoAFtmz4sA:10 a=4PR2P7QzAAAA:8 a=-Z8KlEeUJWKjDiMd_GoA:9 a=NZm5oXbvKSIYLZxo:21 a=6hrx2LTtF8Oi5byw:21 a=6IAXGZPMXUG8YbGD:21 a=UiCQ7L4-1S4A:10 a=hTZeC7Yk6K0A:10 a=frz4AuCg-hUA:10 a=_W_S_7VecoQA:10 a=5YQ6H4ZxyGn-KoBYtt8s:22 a=Urk15JJjZg1Xo0ryW_k8:22 a=W8ajF5jvLdG4-rt1DGEw:22 a=4dqwQCo7Po2mVW515mGf:22 From: "Finn Lassen finn.lassen@verizon.net" Received: from sonic303-21.consmr.mail.ne1.yahoo.com ([66.163.188.147] verified) by logan.com (CommuniGate Pro SMTP 6.2.14) with ESMTPS id 754592 for flyrotary@lancaironline.net; Wed, 16 Sep 2020 08:55:24 -0400 Received-SPF: pass receiver=logan.com; client-ip=66.163.188.147; envelope-from=finn.lassen@verizon.net DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=verizon.net; s=a2048; t=1600260907; bh=NetxoRtxW+r2aYPlGgmv/v9yMBCxLH9Zl/UNKDWxgrU=; h=Subject:To:References:From:Date:In-Reply-To:From:Subject; b=TdaamWVgTuOzyJEx99j70G0udFuUdCpRJ+DuRosiwYnm/yGmejkRDDZj8dYZ/ccR2xnUMWjg2KcvronicsMM8G/9KMfNb0WFgwdx6cAf0p1C2NMf6S5jzUu1YlCQOl8C5S9N+UuHCSdezOaT4GL8SQHxWJrPLWhjuThhgvnmrTGhu9rd9k9dFy1AHUiYxqBQifnPOrK8Fx9qRduyrI0/WF1v3026xveoAN2Ty/bSs4NH3lqZ2NWlPa3K5AX48cagx3KVNXlzdZi/gRLRvKHha84LJGnZvI3P8R/Lg0yU7QV3KShQcLDTMi+ewVIC01EjE53qZhmIPc9DMjgiYlZg6w== X-YMail-OSG: 9TLL7EsVM1lZA3tnerDxvQexciqFmeXnlg5mhOLsZBylga_lda2sOPpp7sseNs2 KNQLPuR5SH3EfdHh4BZsSQ8cSmOCRuWz6v0SFLxBs3mZ3oDCQBqVjN8bicingHSBVkkeicavpALZ ZD_d.3TvvAE4bTZ.JJEWV6RvkJIYtbQC4kelWrm7RbF6wzZSH42PkODh9YAZRqPpduGNUVKtSRQb 4pMOE2PFU6en2JhWaQnTccmr6BPjViSO6FOC1dPBXkdZOa.23SmBrkgB8YgtRTX7Wa6yRBoDipFI NVXW7ueTEO2lb0yOoWfWulGrNbiPeC9RpVQqqRlkcddatA1WnPh.cQTR9KuMqJ8uGo0F9mpD6AeW xdAyMsFBFcGoy7XfryrsDJ1J4cMVOknFVRBXv7t0PStuOs8.8dJlR1IUdBJOrD8Aig1zSSqGylIg nB4i.vRXg1nXfgFUlw3Na6kt75RGMxfw7ODPsOIdo77NaO4117QbT.Y7zf8EFgaJmnF64eNnNlyD Olki3ggeh19V01AhUW9L2rvTVV3fStLDc3_V9N6VeHI_5vIKnc2lmBOJ1Pw5ZiUUZOD2QWHvpQfD ..AUq8o24FAiH2_Zn3p51HqddC2ySqeScC3Iv0P2n_Updtb0TaQBD2CoHIMZrGPZS_IXO2nhV4.T 0wTvxO3VJMUTNyccuTrPqzt8Y3GHj0vJVScR0RVG4LgWfz8VQWtIHR0rtLqufzca07xPGlg4db.w NXHh20gXi1LSx4p6t8zXMm1RTLP_zej8Nru5U0FSp8UNNCZrLZ3BV8AHdXHG.BSQPlVXtea1cF0G cwtFojT6ijDd4SpMIaeY7Uy6y7dh7JXZJbojHsMyyuzWxq4ZRgLBzerDCwW8SB9uWgotdA2miaVk 2lc0qPDDNZ8MQyNasfPq4dNDOnP_LTKqwKU3MsLzulyuxj.abj.EaZRF9gH6rzm7iYiq4tn92Z9L QVd8aZ7.oRplpJe4H3V7sbulhyUeihn.U3Qp39KJhDXt01GBbzUiUKybNcxx1ZbzDyQiMWfXVwic 5BBYTH5nlsJMl5ohZXtt.VMatUueka1mAJoO5Byaiu_TowlM89zrdUz3lqy0fkaDGMZzZDoyknLd vDV7RuLmL96JWF4OxX56BjPCQh9yZIrWLdzks5ljLiHRp0tA0QClv8JHCQwi4SMLjQfaw.i6.aFQ e8FjPU0sSywQskESHAlpv73iO_LI2mbC1vT8qfZq73ai8_Isvt4POsC9DKFNmBCM5vt6mrIXezHQ mPI.uxdW2K67X5UTTltCAPNKBHzpKREBE1SRBWTOu7UIiwWRQ0mT0XgFvYH09_YLxzndzLS5uWm5 Kr9OXCIBvPiKLN5EHqqcIppwc4b5Cb8Hzf7hl.p7dHCRNPs7GxEEbGvZN1zYY242Whde8vNYriLA YxPw4xV_iuE3olzWhDifEG94ePWKtn30gzBOi35pNejxie.MQGYbGL4XmFdzjAHgxPS0Y4TAYKGz ZrnaZAl7RykFHiEr.w0S1Gk6Wic7lqnCgXAO8.fhMAgi0hRunbipqEoC5U0kqn58VhWm95Uy9RLt uIADnvHecZCi2rDo5nK0.W6k- Received: from sonic.gate.mail.ne1.yahoo.com by sonic303.consmr.mail.ne1.yahoo.com with HTTP; Wed, 16 Sep 2020 12:55:07 +0000 Received: by smtp412.mail.bf1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID c4546650956cd80b4fea6e012a307f6d; Wed, 16 Sep 2020 12:55:04 +0000 (UTC) Subject: Re: [FlyRotary] Re: RV-4 prop To: Rotary motors in aircraft References: Message-ID: <00821300-b262-7045-b858-e304fc8554c3@verizon.net> Date: Wed, 16 Sep 2020 08:55:02 -0400 User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------CDF160E7A8FB02A061882DF0" Content-Language: en-US X-Antivirus: Avast (VPS 200916-6, 09/16/2020), Outbound message X-Antivirus-Status: Clean 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: 12173 This is a multi-part message in MIME format. --------------CDF160E7A8FB02A061882DF0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Thanks Bill. I'll take it. Sending you an email directly. Finn On 9/15/2020 9:20 PM, Bill Bradburry bbradburry@verizon.net wrote: > > Finn, > > It is really not too late.  Frank told me that a prop in my condition > was worth $1000, but I want only $700 for it.  That includes the crush > plate and bolts.  That brings the total cost of the prop down to > probably around $600.  It is 76 inches long and needs to be cut down > to at least 74”.  You can do that yourself.  You don’t really HAVE to > get the rain edge installed.  That would save you the $700 that Frank > is charging for that service.  And maybe even Ed Sterba could do it > for you.  Think about it. > > Worst case you would have a brand new $2600 prop for $1400!  Not a bad > deal anyway you cut it. > > Bill > > Sent from Mail for > Windows 10 > > *From: *Finn Lassen finn.lassen@verizonnet > > *Sent: *Tuesday, September 15, 2020 7:58 PM > *To: *Rotary motors in aircraft > *Subject: *[FlyRotary] RV-4 prop > > 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" > > > > > > Virus-free. www.avast.com > > > --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus --------------CDF160E7A8FB02A061882DF0 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit
Thanks Bill.

I'll take it.

Sending you an email directly.

Finn

On 9/15/2020 9:20 PM, Bill Bradburry bbradburry@verizon.net wrote:

Finn,

It is really not too late.  Frank told me that a prop in my condition was worth $1000, but I want only $700 for it.  That includes the crush plate and bolts.  That brings the total cost of the prop down to probably around $600.  It is 76 inches long and needs to be cut down to at least 74”.  You can do that yourself.  You don’t really HAVE to get the rain edge installed.  That would save you the $700 that Frank is charging for that service.  And maybe even Ed Sterba could do it for you.  Think about it. 

 

Worst case you would have a brand new $2600 prop for $1400!  Not a bad deal anyway you cut it.

 

Bill

 

Sent from Mail for Windows 10

 

From: Finn Lassen finn.lassen@verizonnet
Sent: Tuesday, September 15, 2020 7:58 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] RV-4 prop

 

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"

 

Virus-free. www.avast.com

 

 


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