|Born||25 May 1856
Zvolenská Slatina, Kingdom of Hungary
|Died||13 March 1916
|Children||Frida, Wilhelmina, Gustav|
Ján Bahýľ (25 May 1856 – 13 March 1916) was a Slovak inventor and engineer. He worked on several problems from the areas of military science, military construction, engineering etc. Along with other fields, he focused on flying machines. In 1895, he was granted a patent on helicopter.
Bahýľ was born in Zvolenská Slatina, Kingdom of Hungary (today Slovakia). In 1869, Bahýľ graduated from the Mining Academy of Banská Štiavnica (Selmecbánya) with a diploma in technical drawing. After graduation, he joined the Hungarian Army, where he was noticed by superiors after making technical improvements,[vague] and was transferred to the technical staff. The new assignment allowed Bahýľ to study at the Vienna Military Academy, where he graduated in 1879, and was commissioned as a lieutenant. During his time in the army, Bahýľ was able to develop a number of inventions, many of which involved hydraulics.
Bahýľ's first invention, called the Steam Tank, was financed entirely by himself and was purchased by the Russian army. Bahýľ was granted seventeen patents in all, including the invention of a tank pump, a hot air balloon combined with an air turbine, the first petrol engine car in Slovakia (in partnership with Anton Marschall), and a lift inside the castle hill up to the Bratislava Castle. One of the earliest helicopter models was flown in 1901 by Bahýľ who developed a version that used an internal combustion engine as a power source. On 5 May 1905, a version reached a height of 14 ft (4.3 m) and flew 5,300 ft (1,615 m).
See also 
- Ján Bahýľ. Konštruktér, vynálezca. (en. Ján Bahýľ. Constructor, inventor.) Slovak Academy of Sciences.(Slovak)
- Ján Bahýľ — životopis. (en. Ján Bahýľ - biography.) Industrial Property Office of the Slovak Republic (Slovak)
- "Famous Slovaks - Jan Bahyl". Heart of Europe. 2009. Retrieved 20 February 2012.
- Aldawoodi, Namir. An approach to designing an unmanned helicopter autopilot using genetic algorithms and simulated annealing. ProQuest. p. 37. ISBN 978-0-549-77349-8. Retrieved 20 February 2012.