A aviation & planes forum. AviationBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » AviationBanter forum » rec.aviation newsgroups » Soaring
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

Vne



 
 
Thread Tools Display Modes
  #1  
Old November 9th 19, 07:49 PM posted to rec.aviation.soaring
jp
external usenet poster
 
Posts: 10
Default Vne

I know that Vne can vary with altitude but does it also vary with aircraft weight?
Ads
  #2  
Old November 9th 19, 09:21 PM posted to rec.aviation.soaring
Never Again 2
external usenet poster
 
Posts: 7
Default Vne

At 18:49 09 November 2019, jp wrote:
I know that Vne can vary with altitude but does it also vary with

aircraft
weight?

Yes

  #3  
Old November 9th 19, 09:23 PM posted to rec.aviation.soaring
Never Again 2
external usenet poster
 
Posts: 7
Default Vne

At 18:49 09 November 2019, jp wrote:
I know that Vne can vary with altitude but does it also vary with

aircraft
weight?

Yes

  #4  
Old November 9th 19, 09:53 PM posted to rec.aviation.soaring
Charlie Quebec
external usenet poster
 
Posts: 235
Default Vne

Onlynif over max weight and with an engineering order. Within the certified weight range, it stays the same.
  #5  
Old November 9th 19, 11:45 PM posted to rec.aviation.soaring
Eric Greenwell[_4_]
external usenet poster
 
Posts: 1,227
Default Vne

Charlie Quebec wrote on 11/9/2019 12:53 PM:
Onlynif over max weight and with an engineering order. Within the certified weight range, it stays the same.

It may depend on the glider, particularly gliders that carry ballast in the wings.
My guess is pilot weight would have such a small effect, it would not mentioned in
the operating handbook.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)
- "A Guide to Self-Launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1
  #6  
Old November 10th 19, 03:22 AM posted to rec.aviation.soaring
Charles Longley
external usenet poster
 
Posts: 204
Default Vne

I’ve never seen it vary by weight. Check your POH of course
  #7  
Old November 10th 19, 05:15 AM posted to rec.aviation.soaring
Eric Greenwell[_4_]
external usenet poster
 
Posts: 1,227
Default Vne

Charles Longley wrote on 11/9/2019 6:22 PM:
I’ve never seen it vary by weight. Check your POH of course

Now I'm wondering if it's a regulatory requirement that the Vne be set that works
for all allowed weights.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)
- "A Guide to Self-Launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1
  #8  
Old November 10th 19, 06:17 AM posted to rec.aviation.soaring
Echo
external usenet poster
 
Posts: 104
Default Vne

Ehhhhhhh no. In our very sub supersonic world Vne is based on how fast the molecules actually go over the wing, which is the contributing factor to flutter. That's Vne, more specifically, it's given as a True Air Speed because that's the actual speed against molecules. Now what DOES change is the indicated speed for Vne, since IAS is a function more of HOW MANY molecules are getting rammed into the pitot tube. It's important to know those numbers as you descend out of wave. Vne as marked on the gauge red line is invalid up at the higher altitudes. Flying out west up high it may be more like 110kts indicated when the TAS is actually at redline.
  #9  
Old November 10th 19, 09:35 AM posted to rec.aviation.soaring
Duster[_2_]
external usenet poster
 
Posts: 149
Default Vne

Hmmm, I thought Vne Is basically a guess by the FAA that 10% below Vd is safer than 5% below Vd. Vne = 0.9 X Vd (FAR/JAR 23), dive speed Vd determined emperically and is a function of design cruising speed Vc.
  #10  
Old November 10th 19, 04:02 PM posted to rec.aviation.soaring
Echo
external usenet poster
 
Posts: 104
Default Vne

Haven't read that, would be an interesting one though. I'd always been under the impression Vne is a flutter protection speed. That's why it's a TAS that doesn't change with weight like Va. Wouldn't be surprised if it was from some old math though.
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT +1. The time now is 03:47 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright 2004-2019 AviationBanter.
The comments are property of their posters.