Mine is about 25 Y.O. and is still going strong, damn thing can fly backwards into a 5 knot head wind. AUW is about 10 lb and has Y.S. 91 + 18x6 prop this is too much power but great for those stol take offs, An O.S. 90 FS is perfect power! try and over prop any engine you install as you will be at low throttle settings anyway and that big prop will help slow steep decents when at idle. A 120 is way to much power for the Svenson size Storch but thats why we have a throttle so go for it. see my gallery for pics.

Cheers