X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 20 Apr 2008 06:16:26 -0400 Message-ID: X-Original-Return-Path: Received: from fmailhost01.isp.att.net ([207.115.11.51] verified) by logan.com (CommuniGate Pro SMTP 5.2.2) with ESMTP id 2863730 for lml@lancaironline.net; Sat, 19 Apr 2008 23:54:43 -0400 Received-SPF: pass receiver=logan.com; client-ip=207.115.11.51; envelope-from=dskeele@bellsouth.net Received: from fwebmail09.isp.att.net ([207.115.11.159]) by isp.att.net (frfwmhc01) with SMTP id <20080420035405H0100ht596e>; Sun, 20 Apr 2008 03:54:05 +0000 X-Originating-IP: [207.115.11.159] Received: from [68.221.186.51] by fwebmail09.isp.att.net; Sun, 20 Apr 2008 03:54:02 +0000 From: dskeele@bellsouth.net X-Original-To: "Lancair Mailing List" Subject: Re: [LML] Re: Prop diameter Disposition-Notification-To: dskeele@bellsouth.net X-Original-Date: Sun, 20 Apr 2008 03:54:02 +0000 X-Original-Message-Id: <042020080354.26905.480ABE5A00048C920000691922218675169B0A02D2089B9A019C04040A0DBF0A040A0A059C0B@att.net> In-Reply-To: X-Mailer: AT&T Message Center Version 1 (Mar 10 2008) X-Authenticated-Sender: ZHNrZWVsZUBiZWxsc291dGgubmV0 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="NextPart_Webmail_9m3u9jl4l_26905_1208663642_0" --NextPart_Webmail_9m3u9jl4l_26905_1208663642_0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_26905_1208663642_1" --NextPart_Webmail_9m3u9jl4l_26905_1208663642_1 Content-Type: text/plain Content-Transfer-Encoding: 8bit Air.peter@googlemail.com, I would certainly check out the prop diameter reduction with Hartzell or a very knowlageable prop shop. A friend bought a cut down Hartzell prop off a Mooney, if memory serves me it was in the range you are contemplating. He sent it off the Hartzell for testing and it did OK until about 2900 or so when the harmonics started to destroy the prop. He was told by Hartzell that some if not all prop designs have a destructive harmonic which is usually well above normal operating ranges and therfore not a factor. Since we are "experimental" unscrupulus prop vendors will sell you stuff that is not fit for production A/C. There is a lot more to prop specs than diameter.. Hope this helps.. Don Skeele A&P --NextPart_Webmail_9m3u9jl4l_26905_1208663642_1 Content-Type: multipart/related; boundary="NextPart_Webmail_9m3u9jl4l_26905_1208663642_2" --NextPart_Webmail_9m3u9jl4l_26905_1208663642_2 Content-Type: text/html Content-Transfer-Encoding: 8bit
     I would certainly check out the prop diameter reduction with Hartzell or a very knowlageable prop shop.  A friend bought a cut down Hartzell prop off a Mooney, if memory serves me it was in the range you are contemplating.  He sent it off the Hartzell for testing and it did OK until about 2900 or so when the harmonics started to destroy the prop.  He was told by Hartzell  that some if not all prop designs have a destructive harmonic which is usually well above normal operating ranges and therfore not a factor. 
     Since we are "experimental" unscrupulus prop vendors will sell you stuff that is not fit for production A/C.  There is a lot more to prop specs than diameter..  Hope this helps.. Don Skeele A&P  
 
--NextPart_Webmail_9m3u9jl4l_26905_1208663642_2-- --NextPart_Webmail_9m3u9jl4l_26905_1208663642_1-- --NextPart_Webmail_9m3u9jl4l_26905_1208663642_0 Content-Type: message/rfc822 Received: from logan.com (mail.logan.com[207.58.244.114]) by isp.att.net (frfwmxc07) with ESMTP id <20080420020656M07008a1ite>; Sun, 20 Apr 2008 02:06:57 +0000 X-Originating-IP: [207.58.244.114] X-Virus-Scanned: clean according to Sophos on Logan.com X-ListServer: CommuniGate Pro LIST 5.2.2 List-Unsubscribe: List-ID: List-Archive: Precedence: list Message-ID: Reply-To: "Lancair Mailing List" Sender: "Lancair Mailing List" To: lml@lancaironline.net Date: Sat, 19 Apr 2008 22:06:49 -0400 X-Original-Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="_f756878c-64df-48e4-961f-64d0bd8fe3df_" From: Bill Kennedy Subject: [LML] Re: Prop diameter --_f756878c-64df-48e4-961f-64d0bd8fe3df_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hint 1: Fill your nose gear strut. Hint 2: Don't taxi through any depressions. =20 I think I read a recommended prop to ground distance. Trouble is, I can't r= emember what it was. Something between six and nine inches. =20 Good luck -- Bill Kennedy > To: lml@lancaironline.net> Date: Sat, 19 Apr 2008 15:06:07 -0400> From: a= ir.peter@googlemail.com> Subject: [LML] Prop diameter> > Hello all,> I am b= uilding a 360 MKII and got an used Hartzell 2 blade prop, normally used for= an IO360 with 76" of diameter. It is recommended to shorten it to 70" to 7= 2".> What arebyour experiences with prop diameters, independently of manufa= cturer?> Disregarding recomendations due to engine vibrations, my biggest c= oncern is prop clearance. > As every inch counts for efficiency, I do not w= ant to pay for (often) repairs after ground contact.> Any hints (getting mo= re clearance...) and recomendations are highly appreciated.> Thanks in adva= nce,> Peter 360 MKII, 90%> > > --> For archives and unsub http://mail.lanca= ironline.net:81/lists/lml/List.html= --_f756878c-64df-48e4-961f-64d0bd8fe3df_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hint 1: Fill your nose gear strut.
Hint 2: Don't taxi through any depressions.
 
I think I read a recommended prop to ground distance. Trouble is, I can't r= emember what it was. Something between six and nine inches.
 
Good luck -- Bill Kennedy





> To: lml@lancaironline.net
> Date: Sat, 19 Apr 2008 15:06:07 -040= 0
> From: air.peter@googlemail.com
> Subject: [LML] Prop diamet= er
>
> Hello all,
> I am building a 360 MKII and got an = used Hartzell 2 blade prop, normally used for an IO360 with 76" of diameter= . It is recommended to shorten it to 70" to 72".
> What arebyour expe= riences with prop diameters, independently of manufacturer?
> Disrega= rding recomendations due to engine vibrations, my biggest concern is prop c= learance.
> As every inch counts for efficiency, I do not want to pa= y for (often) repairs after ground contact.
> Any hints (getting more= clearance...) and recomendations are highly appreciated.
> Thanks in= advance,
> Peter 360 MKII, 90%
>
>
> --
> = For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html=

= --_f756878c-64df-48e4-961f-64d0bd8fe3df_-- --NextPart_Webmail_9m3u9jl4l_26905_1208663642_0--