I HAD THE OLD DRAGON LADY WITH A OS. 108 UNTILL LAST YEAR WHEN I RETIRED IT AFTER 8 YEARS GREAT LOW WING AIR PLANE I PUT A FULL CANOPY ON IT AND RECOVERED IT AFTER 5 YEARS AND NO IT IS NOT AN EXTRA BUT IS STILL ALOT OF FUN AND WITH THE OS IN IT SHE WOULD MOVE PRETTY GOOD.