Some Great Links Found and Used for Reference
Pilotfriend
http://www.pilotfriend.com/aircraft%20performance/Beech/model%2018.htm
Staggerwing.com
http://www.staggerwing.com/tech_library/model_18_specs/
Rising Up Aviation Resources
http://www.risingup.com/planespecs/info/airplane69.shtml
Canadian Warplane Heritage Museum
http://www.warplane.com/pages/aircraft_beech.html
Pratt & Whitney R-985 Wasp Jr.
http://www.pw.utc.com/about_history_classic_r985.asp
Antique Aircraft Restoration
http://www.moxon.org/aircraft/twnbeech.htm