Hi Jens,
as you can see here, my son flies the clever 6 in his indoor yak, weight RTF is 150grams.
http://www.youtube.com/watch?v=NpMxliUirfs
The clever weights 6.5g using shrink tube instead of the reversible case. If you need it 2 grams leighter, there will be the TINY5 soon. Check WEAs website
www.weatronic.com, there is a picture of it. It will be available end of this month. But Alwin states that the TINY5 is only certified and intended for indoor use, ie range up to 200 meters. It has on-board antennas but is still full programmable and can do telemetry as the big brothers do.
best regards
Thomas