Actually, I have information for another two generations back for your great great grandfather Wojciech Obacz. I have his grandparents Wojciech Obacz and Katarzyna Welc born in 1805. Plus I have a lot more relations for this family.
I got all of this Obacz information strait from the source, the Staromiescie Parish records for Staromiescie (now Rzeszow) and Trzebownisko.
Get a hold of me at my email firstname.lastname@example.org
and I will fill you in further.
Regarding Ryszard Obacz, I don't have any information on him as he was more than likely born after 1902 (no access to post-1902 records at the state archives). There is a Jan Obacz buried in the Trzebownisko cemetery with an ornate design stating he was a pilot who died tragically. Maybe Ryszard was his middle name?