Actually my OS .40LA looked so small on the nose of this trainer i knew i just couldn't use it, the 21cc fit right in nicely and believe me there was no lack of glue when i was done with this plane, i went over everything with CA, i added triangle stock inside the nose of the plane, i epoxied on a pc. of 1/4" ply on top of the original firewall and also ran some extra beads of epoxy around the nose, after 6 flights with the 21cc and about 16 with the 26cc there is no signs of anything coming apart. The explorer flies quite good and from experience it glides in quite nicely, here's one of the maidens from last year with a deadstick where i used to fly, i now have joined a club and prefer having a large flat grass runway to land on. http://www.rcuvideos.com/video/EXPLORER40-wmv