F1N indoor hand launched glider (HLG) is a very popular class for indoor flying.
Both javelin launch and discus launch are allowed, but catapult launch is not.
Follow this link to watch a video of an Indoor HLG (cat.2) flight.
Here is the winner for F1N at the IIF 2009, Jurgen Maassen (best flight 34 s). The model looks like the Indoor Low Ceiling Chuckglider (Jørgen Korsgaard, 1986, free plan).
Here you can see a launch in Kent, USA:
View or download the F1N Rules (0,3 Mb pdf)
A good start is the Indoor Low Ceiling Chuckglider by Jørgen Korsgaard, download the free plan.
Another good plan and very well documented is the SuperSweep article and plan by Ron Wittman.
Other plans and articles can be found at AMA glider. Some of the plans on this site are for catapult launched gliders, but these can easily be used as hand launched gliders.
Record holder: Jurgen Maasen
Date of flight: 29/3/2009, IIFI
Ceiling 8m - 15m: 1 min 0.4 sec
Date of flight: 28/10/2003
Record holders: Akihiro DANJO (Japan), Mitsuru ISHII
Course/place: Tokyo (Japan)
Ceiling 15m - 30m: 1 min 32.2 sec
Date of flight: 01/10/2009
Record holders: Mitsuru ISHII (Japan)
Course/place: Shiga (Japan)
Ceiling over 30m: 1 min 41.2 sec
Date of flight: 10/09/2008
Record holder: Mitsuru ISHII (Japan)
Course/place: Akita (Japan)