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Old Oct 07, 2012, 05:27 PM
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Joined Jun 2012
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not good!

http://m.youtube.com/#/watch?list=TL...FRyeCbxI&gl=DE.


Marcel Schlage
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Old Oct 07, 2012, 10:38 PM
Chillaxin dude!
BulletMaster's Avatar
Newcastle, NSW, Australia
Joined Apr 2003
4,758 Posts
yep... looks like the lack of vertical tail area caused that instability..
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Old Oct 08, 2012, 09:10 AM
Carbon fiber is our friend
Steve C's Avatar
United States, CA, Lodi
Joined Feb 2001
4,083 Posts
Looked pretty impressive to me!
Good pilot didn't panic and pull a bunch of elevator.
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Old Oct 08, 2012, 09:46 AM
I am actually really slow
SlowBarless's Avatar
Brisbane
Joined Jun 2008
901 Posts
Hmmm! Maybe it's not such a great idea after all. Mind you, If I found away, and I could make them get away as cleanly as the F3K's do without adding to much drag in the process. It could be a good idea?

I have a feeling weight distrubution has alot to do with it. F3K models are so light and dont have a great big motor up in the nose. Something to do with circular motion and angular momentum.

Now i think about it an F5D model will probably need ALOT more fin area to get away cleanly after a discus lauch... Probably not worth the extra drag?
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Old Oct 08, 2012, 10:13 AM
Yes..ok..maybe..lol.....
Tucson Avra Valley, Arizona, United States
Joined Jul 2004
5,687 Posts
Quote:
Originally Posted by Dbox View Post
I have done it once and would not recommend to anybody,experienced or not.
Have to say ,I been practicing DLG launches,with DLG planes, since 1997 ,so not a beginner in technique.
Totally different behavior for F5D plane ,for many many reasons.
I will mention just one- all F5D planes have about 3 times smaller vertical tail then regular DLG plane which makes huge difference in stability of the frame on launch.
Otherwords,instead of going straight after leaving Your hand,plane spins horizontally .
....but it brings more spice to whole flying event
Still wanna try
Yuri

Yes........................+1
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Old Oct 09, 2012, 03:44 AM
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Paul.S's Avatar
Aachen, very western Germany
Joined Sep 2007
219 Posts
Quote:
Originally Posted by Dbox View Post
I will mention just one- all F5D planes have about 3 times smaller vertical tail then regular DLG plane which makes huge difference in stability of the frame on launch.
Another pretty important value in this consideration is the inertia of the plane. With the gear drive in it, it's much higher and would need an even bigger vertical tail or lever than a DLG.
...Edit: SlowBarless said it all already.
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Old Oct 10, 2012, 08:41 AM
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epwierman's Avatar
Pasadena Ca
Joined Aug 2004
3,031 Posts
Interesting idea. In my limited discus experience, a rudder and yaw gyro made things very safe and easy for learning the ins and outs. With those two elements, and maybe a longer tail moment, perhaps you could get the result you are looking for, without having to go big on the vert fin surface. Looking forward to seeing the results of your experience. It would surely have the potentential to revolutionize F5D and maybe B as well.
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Old Oct 10, 2012, 09:51 PM
Caution:Makes sharp left turns
Troy's Avatar
United States, CA, Lake Forest
Joined Feb 1999
5,999 Posts
Except no gyros in B or D allowed.
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Old Oct 10, 2012, 10:23 PM
2012 NZ Speedcup - 231 MPH
DownUnderPilot's Avatar
New Zealand, Tasman, Richmond
Joined Mar 2006
1,841 Posts
Maybe if you had a peg mounted between the wingtip and the fuse somehow, to lessen the rotation of the airframe at release... not sure how you'd actually get hold of it though!

Maybe a super streamlined peg coming out of the bottom of the wing, at half span, that you hold onto with your index finger...
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Old Oct 10, 2012, 10:41 PM
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epwierman's Avatar
Pasadena Ca
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Quote:
Originally Posted by Troy View Post
Except no gyros in B or D allowed.
Troy, forgot to thank you for the flying car video. Too cool!!!!
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