[ARC5] Differences: plain models vs "B" models.

[Brian Clarke]

If, and only if fuel consumption were directly proportional to
aircraft weight. Beats all the aerodynamic formulae I know. But then,
someone may know better ... or have both tongues firmly planted in all
four cheeks.73 de Brian, VK2GCE. 
Brian Clarke
BE, MBA, PhD, CPEng, FIEAust
MD, Clarke & Associates P/L

----- Original Message -----
From: "Roy Morgan" 
To:
Cc:"ARC-5 List" 
Sent:Wed, 7 May 2014 18:42:57 -0400
Subject:Re: [ARC5] Differences: plain models vs "B" models.

 On May 7, 2014, at 3:57 PM, WA5CAB--- via ARC5  wrote:
 > 
 > … According to various sources, dropping the paint was supposed
to 
 > save weight and/or save cost. AFAIK, dropping the paint was a WECo
idea.

 I’ve been encouraging my 12-year old to make estimates in math to
see if the answer she got is "in the ball park". Here goes about
saving weight by dropping the paint:

 Consider a B-17 with combat weights:
 Gross take off weight: 65,000 pounds
 Fuel capacity (combat): 2,180 galons x 6.8 lb/gal = ~ 15,000 pounds
 Range: 2000 miles (round trip 4000 miles)

 So: 15,000 pounds / 4000 miles = 3.75 pounds of fuel per mile

 (wild guess): no paint on radios: save one pound of weight.

 You might get a third of a mile more distance with no paint.

 TOO close for comfort, but I’m sure it happened!

 Roy

 Roy Morgan
 RoyMorgan at alum.mit.edu
 K1LKY Since 1958

-------------------------
Email sent using Optus Webmail