At 14:37 PST, a Robinson R44 lost power during a practice autorotation at the Palo Alto Airport. The two occupants were uninjured. The pilot said he was performing an autorotation and that the engine had been at idle for a long period of time. He said he did not think he was going to make the runway and added power, but the engine didnt come on. The pilot said he did not use carburetor heat during the autorotation. The temperature was 64 F and the dewpoint was 52, in the range for serious icing at glide power.