My wife and I train with power and our climb times on the tandem are similar to the average of our climb times on our singles. Caveat...no formalized protocol just measurements from Garmin graph data. We suspect our FTP would be additive on the tandem as well as our 5 second power. Since we are both pursuit track racers, we can really boogie on the tandem for at least a couple of minutes.
Here is a new power meter with info courtesy of the Google wattage group.
Some photos from the pre-Interbike open house:
Information sheet, page 1:
http://www.flickr.com/photos/djconnel/3930884632/
Information sheet, page 2:
http://www.flickr.com/photos/djconnel/3931039857/
Blow-up from wall poster:
http://www.flickr.com/photos/djconnel/3930768660/
Souvenir water bottles
:
http://www.flickr.com/photos/djconnel/3930768710/