[1] Penttlä was a Biathlon competitor who changed to javelin throw at the age of 15.

He won the national title in 1926–1928, and set a new world record in October 1927.

He was a favorite at the 1928 Olympics, but finished sixth due to an elbow injury.

After that he lost domestic competitions to Matti Järvinen, and at the 1932 Games finished third.

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