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Quelch - why convert, there are several readers for Android that can handle RTF - Coolreader does a pretty good job.
If the size of the RTF's bother you then you could save them as DOCX with Word, depending on document they'll probably shrink between 50 and 90%. Again there are several Android readers that handle DOCX - I like Docs to Go, it also handles Excel and Powerpoint
Read RTF on Android
Read DOCX on Android
BR