I don't know how often Tony gets on here so I can sorta answer this one. Tony's Partner idles enough to spin the prop, but not enough to move on the ground.
Also dr.mike, Tony did build another partner and I believe he said its 6 ounces lighter and he liked it so much that he flew it at the nats with little flight time. I believe they are identical, but I'm not sure.
He told me he has picked up the abbra as his next plane. I hope he posts pic's when he build's it.
Kris