chip_MG

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Wow,
Glad to see the Ultra sport is still being built it is a super flying ship. I built two of these from the RCM plans when they first came out. One I gave to a friend of mine who did not like to build. I still have and fly mine after more than allmost 20 years.
Here's a pic of it with my Son in 1995 Austin Tx, ARCA field. Has a .61 MDS which hulls is fine.
Rather than find a cardboard tube, make your own sleve from 2oz fiberglass. Doing it this way will give you an incredably good fit.