Posted: 7/29/2010 23:12:14
Does anyone know about the Belleville washers that are supposed to be in older Citabrias that have oleo struts and the O-235 engine? These "springs" are part number 2-1655, and are called the "high-energy taxi springs." This is apparently also known as the "No-Bounce" system.
I've been led to believe a stack of 43 Belleville washers are supposed to be in my 1966 Citabria with the above engine, but I can't find documentation, type specifications, photos nor diagrams that show these washers. Instead, I found huge springs in the oleo chambers that would support a locomotive, but these "taxi springs" are way too short and the oleos have only half an inch of travel on the ground. This is incorrect: the camber is negative and the gear is in fact toed out because of this sagging.
Can anyone shed any light here? Thanks.
Posted: 8/5/2010 22:30:52
I would contact American Champion. They still have the drawings for the old airplanes. A second stop would be the Belanca Champion club. There where two different types of springs used in the no bounce gear.
Posted: 8/8/2010 18:07:28
Thanks, but be advised Am. Champion knows nothing about oleos. I got the correct 2-1655 Belleville springs from Univair, which company manufactures them new, and put them in. Now I have the correct positive camber, which this aircraft has not had for many years. The "stepped-on" look is gone. Another major benefit is the aircraft now has more prop clearance. These correct springs give it about 1.5 inches of ground travel where it used to have half an inch. Also be advised I was told the short, heavy taxi springs were "correct" by a fellow who was supposed to be an expert on these. I suspect his information was incomplete. Those were NOT the correct springs for the O-235 engine. The correct ones for my airplane are indeed 2-1655. Problem solved.