That's the good old days
Thank you Tsz Ming.
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| DLG video http://www.rcsail.com/forum/viewtopic.php?f=4&t=1996 |
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| Author: | Tsz Ming [ Sat Mar 26, 2011 2:05 am ] |
| Post subject: | DLG video |
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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| Author: | K.Y.Mak [ Sat Mar 26, 2011 11:03 pm ] |
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That's the good old days
Thank you Tsz Ming. |
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| Author: | Ah Pong [ Sat Mar 26, 2011 11:03 pm ] |
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Hi Tze Ming, That was 2004. We still young from our bottom of heart. Cheers. |
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| Author: | Tsz Ming [ Sat Mar 26, 2011 11:16 pm ] |
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I have a question, why all DLG plane need a long tail fin on the bottom? Ming Lou |
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| Author: | CM Cheng [ Sun Mar 27, 2011 9:30 pm ] |
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That "somewhere in FanLing" is now occupied by power planes . .. 
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. 
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| Author: | Tsz Ming [ Sun Mar 27, 2011 10:03 pm ] |
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CM I am now understood, thank! Tsz Ming |
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| Author: | Yeung [ Mon Mar 28, 2011 6:38 pm ] |
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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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| Author: | ThomasLee [ Tue May 31, 2011 12:31 pm ] |
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CM Cheng wrote: That "somewhere in FanLing" is now occupied by power planes . ..
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. 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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