X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from EXHUB003-4.exch003intermedia.net ([207.5.74.111] verified) by logan.com (CommuniGate Pro SMTP 5.3.9) with ESMTPS id 4499042 for flyrotary@lancaironline.net; Fri, 08 Oct 2010 20:41:59 -0400 Received-SPF: none receiver=logan.com; client-ip=207.5.74.111; envelope-from=jwhaley@datacast.com Received: from EXVMBX003-5.exch003intermedia.net ([207.5.74.45]) by EXHUB003-4.exch003intermedia.net ([207.5.74.111]) with mapi; Fri, 8 Oct 2010 17:41:23 -0700 From: Jeff Whaley To: 'Rotary motors in aircraft' Date: Fri, 8 Oct 2010 17:41:22 -0700 Subject: Another prop performance calculator Thread-Topic: Another prop performance calculator Thread-Index: AQHLZ0qyAgkkD0S3aEaxzDRNQovuWA== Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_C03ABB0A7362B84BB53D544B3C305E0E017970322324EXVMBX0035e_" MIME-Version: 1.0 --_000_C03ABB0A7362B84BB53D544B3C305E0E017970322324EXVMBX0035e_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ed, with my prop numbers (74"x 58", 4 blades, 59F, 6100 engine rpm or 2140 = prop rpm) entered into this calculator it says I'm making 196 hp static ...= seems hard to believe. I've always wondered what the difference is between 4 blades Vs 2 ... the s= ame numbers with 2 blades gives 117 hp.. Also, my prop is a Warp Drive and the pitch is measured at the tip ... don'= t most prop manufacturers specify pitch at 75-80% of diameter? Wish I had been in Paducah to bolt your prop on and see what happened ... Jeff From: "Ed Anderson" Subject: Another Prop Performance Calculator Date: Fri, 8 Oct 2010 19:06:16 -0400 To: "Rotary motors in aircraft" [http://lancaironline.net:81/TextHeaders.gif] [http://lancaironline.net:81/TextLetter.gif] Here is a link to a STATIC performance calculator that seems to at least gi= ve reasonable results http://personal.osi.hu/fuzesisz/strc_eng/index.htm I could turn 5800 rpm static when my prop was 76x88 which this calculator i= ndicates the engine was producing 168.1 HP to turn the prop 2035 rpm When I trimmed the prop back to 74x88 I picked up 200 static engine rpm wh= ich this calculator then indicated the engine was producing167.2 HP to turn= the prop 2105 rpm So between 165 and 170 HP seems reasonable. Edward L. Anderson Anderson Electronic Enterprises LLC 305 Reefton Road Weddington, NC 28104 http://www.andersonee.com http://www.eicommander.com This message, and the documents attached hereto, is intended only for the a= ddressee and may contain privileged or confidential information. Any unauth= orized disclosure is strictly prohibited. If you have received this message= in error, please notify us immediately so that we may correct our internal= records. Please then delete the original message. Thank you. --_000_C03ABB0A7362B84BB53D544B3C305E0E017970322324EXVMBX0035e_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Ed,&nbs= p;with my prop numbers (74"x 58", 4 blades, 59F, 6100 engine rpm = or 2140 prop rpm) entered into this calculator it says I'm making 196 hp st= atic ... seems hard to believe.
I've always wondered what= the difference is between 4 blades Vs 2 ..= . the same numbers with 2 blades gives 117 hp..
Also, my prop is a Warp D= rive and the pitch is measured at the tip ... don't most prop manufacturers= specify pitch at 75-80% of diameter?
Wish I had been in Paduca= h to bolt your prop on and see what happened ...
Jeff
 
 
From: "Ed Anderson" <eanderson@carolina.= rr.com>
Subject: Another Prop Performance Calculator
Date: Fri, 8 Oct 2010 19:06:16 -0400
To: "Rotary motors in aircraft" <flyro= tary@lancaironline.net>
3D"Message

3D"Undecoded
Here is a link to a STATIC performance calculator= that seems to at least give reasonable results
 
 
I could turn 5800 rpm static when my prop was 76x= 88 which this calculator indicates the engine was producing 168.1 HP to tur= n the prop 2035 rpm
 
When I trimmed the prop back to 74x88 I picked up= 200 static  engine rpm which this calculator then indicated the engin= e was producing167.2 HP to turn the prop 2105 rpm
 
So between 165 and 170 HP seems reasonable.
 
 
 
Edward L. Anderson
Anderson Electronic Enterprises LLC
305 Reefton Road
Weddington, NC 28104
http://www.andersonee.com
http://www.eicommander.com

This message, and the docum= ents attached hereto, is intended only for the addressee and may contain pr= ivileged or confidential information. Any unauthorized disclosure is strict= ly prohibited. If you have received this message in error, please notify us immediately so that we may correct our = internal records. Please then delete the original message. Thank you.
 --_000_C03ABB0A7362B84BB53D544B3C305E0E017970322324EXVMBX0035e_--