REFLECTOR: Gliding Distance

[Brooke Wolf]

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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