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

Glider pull-up and ballast



 
 
Thread Tools Display Modes
  #1  
Old September 15th 03, 06:29 PM
M B
external usenet poster
 
Posts: n/a
Default Glider pull-up and ballast

The ballasted gliders resist deceleration better than
the unballasted ones. Golf balls are another example.
If we shoot a golf ball straight up and a ping pong
ball straight up at the same velocity, the golf ball
will go much higher because it resists deceleration
better (has more momentum). Given two objects of equal
drag, the heavier one will go higher, if we ignore
the idea of the 'wing' and the need to translate horizontal
to vertical momentum. If we include the concept of
the wing, at some weight difference between the gliders
and at some selected initial airspeed, the additional
angle-of-attack required by the ballasted glider pull-up
causes enough additional drag to negate the benefit
of momentum and the unballasted glider climbs higher.
The two easy special cases to consider a 1) unballasted
glider with weight = 0 and 2) initial airspeed = ballasted
glider's stall speed. If 1 and 2 are true, both gliders
attain the same height gain of 0. If 1 only is true,
the ballasted glider climbs higher. If 2 only is true,
the unballasted glider climbs higher. For other values
of weights, initial airspeeds, and drag/lift, 'it depends...'
The easy math shown here demonstrates that all three
cases ,, and = are possible.



 




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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Question of the day szd41a Soaring 34 September 15th 03 04:57 PM
FAA publication Glider Flying Handbook Jim Phoenix Soaring 5 August 11th 03 03:58 PM
SR- 71/ Blackbird lore Larry Dighera Military Aviation 28 July 31st 03 02:20 PM


All times are GMT +1. The time now is 06:09 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 AviationBanter.
The comments are property of their posters.