Abstract We propose that TIC 448892817 is a double-mode high-amplitude δ Scuti star. The radial modes detected in this star provide unique opportunity to exploit asteroseismic techniques up their limits. 30 significant frequencies are by frequency analysis, while two of them independent frequencies, i.e., F0 = 13.43538(2) day −1 and F1 17.27007(4) . ratio f 1 / 2 measured be 0.777957(2), sugges...