Well Ross I believe you're probably right about the Rare Bear record, though the rotary powered example was gunning for the 10,000 foot record. Which is only another 158 feet or so. That is 1'31" (for Rare Bear). They are saying that they have been certified for the 10,000 foot record at 100 seconds. 1'40" That means they used about 9 seconds to climb that last 158 feet. That puts them damm close to Bear's time to 3000 meters, if they didn't beat it. Still quite an accomplishment considering the shoestring that they spent on the plane by comparison. You or I might have configured things differently but they have an impressive result. The rotary is a tough little engine.
Bill Jepson