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Tsz Ming
 Post subject: DLG video
PostPosted: Sat Mar 26, 2011 2:05 am 
DLG video...
almost 10 years ago...
when we are still young
http://www.youtube.com/watch?v=eOKqkco_S-Y

Tsz Ming
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K.Y.Mak
 Post subject:
PostPosted: Sat Mar 26, 2011 11:03 pm 
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Joined: Thu Feb 26, 2004 7:54 pm
Posts: 1660
Location: Tai Po, HK
That's the good old days :!:

Thank you Tsz Ming.
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Ah Pong
 Post subject:
PostPosted: Sat Mar 26, 2011 11:03 pm 
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Joined: Wed Mar 03, 2004 7:31 pm
Posts: 1026
Hi Tze Ming,


That was 2004.

We still young from our bottom of heart.

Cheers.
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Tsz Ming
 Post subject:
PostPosted: Sat Mar 26, 2011 11:16 pm 
I have a question, why all DLG plane need a long tail fin on the bottom?

Ming Lou
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CM Cheng
 Post subject:
PostPosted: Sun Mar 27, 2011 9:30 pm 
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Joined: Thu Feb 26, 2004 5:08 pm
Posts: 3117
Location: Hong Kong
That "somewhere in FanLing" is now occupied by power planes . .. :x

For the vertical fin, it is to counter the force on boom. During discus launch, there is a large force acted on the vertical stabilizer. If the fin is on the top only, it will "twist" the boom. Either the fin is teared off, or the boom is damaged. :idea:
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Tsz Ming
 Post subject:
PostPosted: Sun Mar 27, 2011 10:03 pm 
CM

I am now understood, thank!

Tsz Ming
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Yeung
 Post subject:
PostPosted: Mon Mar 28, 2011 6:38 pm 

Joined: Mon Aug 02, 2004 10:14 am
Posts: 621
The Fanling site is mainly occupied by EP planes or duct fans (Albert knows it well). As long as we can enter and share the space, why not schedule an event there?

Yeung
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ThomasLee
 Post subject:
PostPosted: Tue May 31, 2011 12:31 pm 
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Joined: Wed Apr 20, 2011 10:02 am
Posts: 355
Location: Vancouver/Yuen Long
CM Cheng wrote:
That "somewhere in FanLing" is now occupied by power planes . .. :x

For the vertical fin, it is to counter the force on boom. During discus launch, there is a large force acted on the vertical stabilizer. If the fin is on the top only, it will "twist" the boom. Either the fin is teared off, or the boom is damaged. :idea:


The main reason is that during launch, there is a huge amount of yaw upon release that if the vertical stabilizer is like the other planes with only the top portion, the yaw will send the plane into a spiral and become un-launchable and un-controllable. The bottom portion of the vertical stabilizer counteracts the yaw forces from the launch symmetrically with the top portion of the vertical stabilizer so that it will launch straight and lose less energy.
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