I had World Models MM with a Saito .91 a few years back. Very nice flyer but tended to nose over when taxiing in the grass. I canted the gear forward a bit which helped. It also tends to float on landing as it istough to slow down. I fixed that by adding spoilerons - ailerons which deflect upwards and served as spoilers when I hit the switch a few feet off the deck. Lot's of fun!