mod_rewrite and WO to rewrite /index.html into

I would like a simple apache rewrite of /index.html into the start of  
my wo-app.  I do not want a redirect but want /index.html to actually  
return the main page of my app without a redirect.  Right now I am  
just interested in the main page.   Maybe later I will play with  
other things.

Anyway, I have googled WO and mod_rewrite and it says, if I  
understood things correctly, in the various posts, to place  
mod_rewrite after the AddModule / LoadModule for mod_webobjects.  I  
have done that (have actually tried both).

My rule is a simple one

     RewriteEngine on
     RewriteLog logs/mysite.com-rewrite_log
     RewriteRule ^index\.html$ cgi-bin/WebObjects/app.woa

I have also tried it with [PT] for pass-through at the end of the rule

Nothing happens and I do not get anything in the rewrite log, which  
was created but stays 0 length.

Has anyone used rewriting in this way?

Thanks
Chad