Haacke HFM-2

The Haacke HFM-2 was a German two cylinder flat engine built in the early 1920s.[1]

HFM-2
HFM-2a on display at the Finnish Airforce Museum
Type	Flat-twin aero engine
National origin	Germany
Manufacturer	Haacke Motorenbau, Johannisthal (Berlin)

Variants

From Flight[2]

• HFM-2 (22 kW (30 hp))
• HFM-2a (22–26 kW (30–35 hp)); as HFM-2 apart from 120 mm (4.72 in) bore

Applications

• Albatros L.66[3]
• Dietrich-Gobiet DP.VII[4]
• Działowski D.K.D.1[5]
• Dobi-I[6]
• Gabriel P 5[7]
• Mayenberger amphibian[8]
• Rieseler R.I[9]
• Rieseler R.II[9]
• Rieseler R.III[10]
• Silesia S-3[11]
• Silesia S-4[12]
• Udet U.1[13]
• Udet U.2[14]

Engines on display

• Finnish Airforce Museum

Specifications (HFM-2)

Data from Flight[2]

General characteristics

• Type: Four-stroke horizontally opposed twin cylinder
• Bore: 112 mm (4.4 in)
• Stroke: 140 mm (5.5 in)
• Dry weight: 60 kg (132 lb)

Components

• Valvetrain: Overhead valve
• Oil system: Camshaft-operated twin plunger pumps
• Cooling system: Air-cooled

Performance

• Power output: 22 kW (30 hp) at 1,300 rpm

See also

Comparable engines

• ABC Scorpion

Related lists

• List of aircraft engines

References

1. "Aerodromas » History". aleksotasair.lt. Retrieved 2017-02-23.
2. "The Haacke 30 hp aero engine". flightglobal.com. Retrieved 2017-02-23.
3. "The German exhibits". Flight. Vol. XV no. 24. 12 June 1924. pp. 384–5.
4. "The Dietrich-Gobiet Sport Monoplane". Flight. Vol. XVI no. 21. 22 May 1924. pp. 286–7.
5. Cynk, Jerzy (1971). Polish Aircraft 1893-1939. London: Putnam Publishing. p. 601. ISBN 0 370 00085 4.
6. Serryer, J (13 March 1924). "Les avions Dobkevicius". Les Ailes (143): 2–3.
7. Cynk, Jerzy (1971). Polish Aircraft 1893-1939. London: Putnam Publishing. pp. 584–6. ISBN 0 370 00085 4.
8. "Mayenbergen amphibian". Retrieved 26 February 2017.
9. "Rieseler I and II". Retrieved 26 February 2017.
10. "Rieseler III". Retrieved 26 February 2017.
11. Cynk, Jerzy (1971). Polish Aircraft 1893-1939. London: Putnam Publishing. pp. 552–3. ISBN 0 370 00085 4.
12. Cynk, Jerzy (1971). Polish Aircraft 1893-1939. London: Putnam Publishing. pp. 594–5. ISBN 0 370 00085 4.
13. "Udet U.1". Retrieved 26 February 2017.
14. "The Udet Sporting Two-seater". Flight. XV (10): 122.