Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Sun, 14 Dec 2003 13:10:29 -0500 Message-ID: X-Original-Return-Path: Received: from mxsf14.cluster1.charter.net ([209.225.28.214] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2890324 for lml@lancaironline.net; Sun, 14 Dec 2003 10:26:33 -0500 Received: from erics1200mhz (cpe-68-186-243-158.ma.charter.com [68.186.243.158]) by mxsf14.cluster1.charter.net (8.12.10/8.12.8) with SMTP id hBEFMuW3017973 for ; Sun, 14 Dec 2003 10:22:56 -0500 (EST) (envelope-from emjones@charter.net) X-Original-Message-ID: <006101c3c257$0b7583e0$0300a8c0@erics1200mhz> From: "Eric M. Jones" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: Flying Cost? X-Original-Date: Sun, 14 Dec 2003 10:29:20 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_005E_01C3C22D.2263F980" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_005E_01C3C22D.2263F980 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Given the somewhat complex nature of these calculation...I am curious as = to the incremental cost of adding or subtracting weight from you = aircraft? That is: If you can take a pound off your airplane...how much is that = worth per hour? Eric ----- Original Message -----=20 From: Sky2high@aol.com=20 To: Lancair Mailing List=20 Sent: Saturday, December 13, 2003 9:49 PM Subject: [LML] Re: Flying Cost per hour? In a message dated 12/13/2003 5:12:50 PM Central Standard Time, = VTAILJEFF@aol.com writes: I can't remember all the details but he had a formula that took = gallons per hour (Rich of Peak) times price per gallon times a constant = and voila you had a pretty close estimate of your cost per flight hour. = I think for a retract single the constant was 2.5 to 3.0. For a fixed = gear single it was about 2.0 and for a light twin it was better than = 3.0. Jeff, You are right, It worked for my Skymaster clt twin when gas was about = $2.20/gal, 20 gph times 3 equaled $132/hr - very close. However, = experimentals require carefully calculated adjustments. Take a retractable single (please) -- Adjust the constant 2.5 as = follows: subtract .5314466667 if the builder/repairman maintains the airplane = and more than one motorcycle, only subtract .000122257 if the builder/repairman likes "gadgets" add .100067 if you live in Texas or Oklahoma and only do intrastate = travel utilizing cheap avgas. add 3.666667 if your airplane is based in an OPEC country not yet = invaded by the coalition (cheap gas again) and you actually fly. add .5 if the owner bought the plane and uses a "certified" mechanic = (later tool/parts purchases are not yet added in). add 0 if the builder/owner is a "certified" A & P (general practioner, = fabric speciality, prior boat owner, has his own roll of safety wire) add 1.5 if the builder/owner did not do the firewall forward work and = had the panel built by some cad/cam shop with professional terminal = crimpers (ya still gotta drill your own holes later). add 2.0 if the builder/owner is a certified jet mechanic and only = knows what "vane" means (no, no, not vein - thats for doctor/pilots). add another 1.0 for those "owners" that have had 3 or more "incidents" There are other positive adjustments (especially for those that have = executed their first high key without changing their vocal pitch, use = mach numbers for all speed indications, only use straight in approaches, = can't remember where the "pitot heat" sw is, etc.). Prop costs must be calculated separately. Note: if I have failed to offend any specific group, please let me = know so I can correct that in the future and become more compassionately = inclusive. Scott Krueger Sky2high@aol.com II-P N92EX IO320 Aurora, IL (KARR) "...as we know, there are known knowns; there are things we know we = know. We also know there are known unknowns; that is to say we know = there are some things we do not know. But there are also unknown = unknowns - the ones we don't know we don't know." D. Rumsfeld ------=_NextPart_000_005E_01C3C22D.2263F980 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Given the somewhat complex nature of these calculation...I am = curious as to=20 the incremental cost of adding or subtracting weight from you = aircraft?
 
That is: If you can take a pound off your airplane...how much is = that worth=20 per hour?
 
Eric
 
----- Original Message -----
From:=20 Sky2high@aol.com=20
Sent: Saturday, December 13, = 2003 9:49=20 PM
Subject: [LML] Re: Flying Cost = per=20 hour?

In a message dated 12/13/2003 5:12:50 PM Central Standard Time, = VTAILJEFF@aol.com writes:
I can't remember all the details but he had a = formula that=20 took gallons per hour (Rich of Peak) times price per gallon = times a=20 constant and voila you had a pretty close estimate of your cost per = flight=20 hour. I think for a retract single the constant was 2.5 to 3.0. = For a=20 fixed gear single it was about 2.0 and for a light twin it was = better than=20 3.0.
Jeff,
 
You are right, It worked for my Skymaster clt twin when gas = was=20 about $2.20/gal, 20 gph times 3 equaled $132/hr - very close.=20  However, experimentals require carefully calculated=20 adjustments.
 
Take a retractable single (please) --  Adjust the = constant 2.5=20 as follows:
 
subtract .5314466667 if the builder/repairman maintains the = airplane and=20 more than one motorcycle,
 
only subtract .000122257  if the builder/repairman likes=20 "gadgets"
 
add .100067 if you live in Texas or Oklahoma and only do = intrastate=20 travel utilizing cheap avgas.
 
add 3.666667 if your airplane is based in an OPEC country not yet = invaded=20 by the coalition (cheap gas again) and you actually fly.
 
add .5 if the owner bought the plane and uses a "certified" = mechanic=20 (later tool/parts purchases are not yet added in).
 
add 0 if the builder/owner is a "certified" A & P (general=20 practioner, fabric speciality, prior boat owner, has his own roll of = safety=20 wire)
 
add 1.5 if the builder/owner did not do the firewall forward=20 work and had the panel built by some cad/cam shop with=20 professional terminal crimpers (ya still gotta drill your = own holes=20 later).
 
add 2.0 if the builder/owner is a certified jet mechanic and only = knows=20 what "vane" means (no, no, not vein - thats for doctor/pilots).
 
add another 1.0 for those "owners" that have had 3 or more=20 "incidents"
 
There are other positive adjustments (especially for those that=20 have executed their first high key without changing = their vocal=20 pitch, use mach numbers for all speed indications, only use straight = in=20 approaches, can't remember where the "pitot heat" sw is, etc.).
 
Prop costs must be calculated separately.
 
Note: if I have failed to offend any specific group, please let = me know=20 so I can correct that in the future and become more compassionately=20 inclusive.
 
Scott=20 Krueger
Sky2high@aol.com
II-P N92EX IO320 Aurora, IL=20 (KARR)

"...as we know, there are known knowns; there are things = we know=20 we know. We also know there are known unknowns; that is to say we know = there=20 are some things we do not know. But there are also unknown unknowns - = the ones=20 we don't know we don't know." D.=20 Rumsfeld
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