Here on page 513 of the Sears 1969 Christmas Wish Book are three .049-powered models - the Vaught F4U Corsair (actually an F2G-1) control line airplane, the Sea Bee speed boat, and the 1/25-scale Dune Buggy.
If memory serves me correctly, I crashed... er... owned one of the Corsairs back in the era. $11.95 for the Corsair then, probably $150 for one off of eBay today.
Update: I bought a nice Cox F2G-1 Corsair control line model off eBay in April of 2015. Click the link to see photos.
Use the U.S. Bureau of Labor Statistics' inflation calculator to see what items cost in today's dollars. That $11.99 would equal $73.49 in 2011 money.
Cox Corsair Control Line Model from the 1969 Sears Wish Book
Posted November 20, 2011