Friction loss in the detonation tube is measured as acceleration. Friction loss is produced between detonation wave, exhaust gas and wall of the chancel. The velocity of the detonation tube movement was detected by using ballistic a pendulum arrangement and laser doppler vibrometer. Also, the rectangle detonation tube that can be changed surface roughness in the channel was developed for measuring thrust loss is due to a different roughness in the channel. 4 types of roughness (Rz = 0.80 μm, 20.02 μ m, 36.44 μm, 95.65 μm) were used in this study. Net specific impulse of 31.1 sec was decreased by surface roughness. Friction loss is confirmed as acceleration that was produced by 4 ms from ignition.
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