REFLECTOR: Gliding Distance

Thu Jun 21 06:40:19 CDT 2012

Brooke, All,
I was reviewing Glide Ratio and found this:

http://www.csgnetwork.com/glideratiocalc.html

Whoever these folks are they as well subscribe to THE NAVY WAY in calculating GLIDE RATIO, as I was brainwashed into in my youth. 
I was just verifying the brainwashing wasn't losing it's effect in my old age. 15 to 1 GLIDE RATIO = 15 feet/meters/NM (units) forward and 1 foot/meter/NM down.
Brooke I'm not sure what the AIR FORCE brainwashes, but I never really understood you guys anyhow. None of the stuff you guys fly will land on a boat! Feeble landing gear. Incomprehensible to me! Why would you guys give up a perfectly good strip in the middle of the ocean of your choice worldwide? Maybe with that GLIDE RATIO you guys learned you figured you might make it to shore? (They lied to you!). We could land on all your strips. And only soil 1/8th of your perfectly manicured 12,000' runway! Thank you very much!
At least the Navy played it straight with us, and gave us a strip on a boat to keep us out of the drink. :)

Mark B. Magee
N34XL XLFG
Sent from IPhone 4

On Jun 19, 2012, at 10:35 PM, Brooke Wolf <bwolf1 at tds.net> wrote:

> Mark
> 
> I can't wait to meet you.  We got some talkin to do!
> 
> Brooke, USAF
> 
>> 
>> From: Mark Magee <edjonesbrady at gmail.com>
>> Subject: Re: REFLECTOR: Gliding Distance
>> Date: June 19, 2012 11:16:03 PM EDT
>> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>> Cc: "reflector at tvbf.org" <reflector at tvbf.org>
>> Reply-To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>> 
>> 
>> Hi Brooke,
>> Unfortunately or fortunately I learned some things The Navy way (there is: The Right Way, The Wrong Way And The NAVY WAY). I was trained glide ratio is first number is horizontal and second vertical and in the same units. 15 to 1: 15 ft or NM forward for each 1 ft or NM down.
>> Is that not the std used by all?
>> 
>> Mark B. Magee
>> Sent from IPhone 4
>> 
>> On Jun 19, 2012, at 9:50 PM, Brooke Wolf <bwolf1 at tds.net> wrote:
>> 
>>> Mark
>>> 
>>> I'm with you!  All I want to know is…."When my engine quits at 5000 AGL, how many no wind miles can I glide?".  I tend to think of altitude in feet and distance in miles.  Different pilots have different ways of thinking about this.  I prefer to think about it in terms of "How many miles can I go per thousand feet of altitude".  Most every airplane I have flown has been "3 to 1".  As you know that doesn't mean 3:1 glide ratio…it means I can go 3 miles for every 1000 ft altitude.  Other pilots think in terms of actual glide ratio i.e. "18:1" which is exactly 3 to 1.  Got you confused yet?  It is all in semantics.  It is important to get the semantics right so that we are all on the same page.
>>> 
>>> Lets keep this discussion going.  How far can YOU glide in your suddenly unpowered Velocity from 5000 feet (no wind of course!
>>> 
>>> Your Phantom could only glide 5NM (30,000 ft)  from 10000 feet?   Man that thing was a brick!!  The closest thing I can relate to is the T-38.  All I remember about it was that L/Dmax was 240KIAS.  Can't remember the glide ratio.  Too many dead brain cells.
>>> 
>>> Brooke
>>> 
>>>  
>>> 
>>> 
>>>> 
>>>> 
>>>> From: Mark Magee <edjonesbrady at gmail.com>
>>>> Subject: Re: REFLECTOR: Gliding Distance
>>>> Date: June 19, 2012 9:40:33 PM EDT
>>>> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>>>> Reply-To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>>>> 
>>>> 
>>>> You boys got me all confused here? Glide ratio: Three to One (F-4 Phantom II), at Best Glide speed airplane goes three feet forward and goes down 1 foot. Three to One Glide Ratio. You guys are throwing in some trigonometry that's confusing (possibly frightening) folks? At 10,000' AGL an F4 Phantom II in flameout at best glide has a 30,000 ft 'cone' below it at which touchdown (or ejection) will occur. Turns lessen the Three to One.
>>>> Fairly simple: if an XLFG clean and stopped prop does a 15 to 1 glide ratio, then at 10,000' AGL, I have a 150,000'  'cone' below me inside which my wheels will touch down, turns diminishing the cone. Airplane moves 15 feet forward, and falls 1 foot. 15 to 1 glide ratio.
>>>> Fairly simple.
>>>> 
>>>> Mark B. Magee
>>>> PS (F-4 Phantom II was a template subject of my flight training: proof that with enough thrust a lead brick can fly!)
>>>> 
>>>> On Tue, Jun 19, 2012 at 7:34 PM, Brooke Wolf <bwolf1 at tds.net> wrote:
>>>> Tom
>>>> 
>>>> I was using the aviation standard of 6000ft/nautical mile. Admittedly, it is more like 6076 feet.  Anyway, using 6000 ft., 1.41 nautical miles is 8460 ft.  Hence, 8.4:1 glide ratio.  Man…I like this stuff.  Great discussion!  Keep it up.
>>>> 
>>>> Brooke
>>>> 
>>>>  
>>>>> 
> 
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