621c420899075110VgnVCM100000a9a514acRCRDapproved/Professionals/FreeformSample Activity: Long-Rotor and Short-Rotor Helicopters (.pdf/89K)521c420899075110VgnVCM100000a9a514ac____Sample Activity: Long-Rotor and Short-Rotor Helicopters (.pdf/89K) Sample Activity: Long-Rotor and Short-Rotor Helicopters (.pdf/89K) <a href="http://www.collegeboard.com/prod_downloads/ipeAPC/ap04_preap_5_strat_ma_35955.pdf" target="_blank" title="Sample Activity: Long-Rotor and Short-Rotor Helicopters (.pdf/89k)" id="5fdadf2584e84110vcm-02000000aaa514acRCRD">Sample Activity: Long-Rotor and Short-Rotor Helicopters (.pdf/89K)</a> 4311915568000001577854800000469242bb5c714110VgnVCM200000121a16acRCRD