* Sales revenue falls 12 percent to 6.6 bln euros in FY
* Unit sales down 24 percent to around 75,200 vehicles
* "Cautiously optimistic" about 2010 - Porsche AG CEO
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FRANKFURT, Sept 15 (Reuters) - The head of Porsche's core sports car business said he was warily upbeat about a rebound in 2010 after unit sales sank nearly a quarter -- twice as fast as revenue -- in the fiscal year to the end of July 2009.
"Even though the next few months should remain difficult, we are cautiously optimistic about the year 2010," Michael Macht said in a statement on Tuesday.
Preliminary results showed unit sales at the Porsche AG sports car business contracted 24 percent to around 75,200 vehicles in the past fiscal year while sales revenue fell 12 percent to around 6.6 billion euros, the company said.
Porsche shares eased 0.4 percent to 48.831 euros by 0800 GMT while the DJ Stoxx European car sector index slipped 0.7 percent.
Porsche SE is selling a 42 percent stake in Porsche AG, its healthy sports car business, to Volkswagen for 3.3 billion euros as part of a multi-stage deal to integrate the two companies by 2011. (Reporting by Michael Shields and Edward Taylor)