Porsche Aircraft engines.

Discussion in 'Engines' started by Shortround6, Jul 31, 2014.

  1. Shortround6

    Shortround6 Well-Known Member

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    This data is from a 1960/61 edition of "Aircraft Engines of the World" by Wilkinson. I don't know when the first Porsche aircraft engine was developed/marketed.

    These appear to be flat four cylinder engines derived from the current Porsche 356 car engine and having a common ancestry with the VW engine.

    5 models are listed, the 678/1, 678/3, 678/3A, 678/4 and the 701.1.

    ALL share a common power section and differ in starter and drive arrangements and some have cooling fans. Carburetors also vary considerably.

    The 678/3A appears to be one of the simpler versions with direct drive, electric start and 2 Bing 6/24 horizontal carbs.

    Bore: 82.5mm
    Stroke: 74MM
    Disp: 1.6 liter/96.5 cu in
    CR: 7.5:1
    Weight 85 KG/187lbs

    T-O power 52hp/3200rom/sea level
    normal power 50hp/3150rpm/sea level
    cruising power 40hp/2950rpm/sea level

    The 678/3 used a manual starter.

    The 678/1 used a 2.12:1 reduction gear to the propeller and a Pallas Zenith 32 NDIZF dual choke downdraft carb.

    Weight went to 106kg/234lbs. Prop turned 2120rpm for take-off.

    T-0 power was 65hp/4500rpm/sea level
    max cont power 55hp/4200rpm/sea level
    Cruising power 50hp/4080rpm/sea level

    The 702/1 was similar to the 678/1 but arranged for vertical mounting, had a fan for cooling and manual starter.

    The 678/4 raised the compression to 9.0:1 and used a pair of Pallas Zenith 36 NDIZF dual choke downdraft carbs. Used a fan for cooling (looking much like the fan housing familiar to owners of old VWs) and used 1.98:1 reduction gear with a prop flange ( what they planned to put it in with that fan I don't know, auto gyros?) and a prop speed at take-off of 2325rpm.

    Weight was 112KG/247lbs

    T-O power 75hp/4600rpm/sea level
    Normal power 70hp/4500rpm/sea level
    cruising power 60hp/4270rpm/sea level

    The 1962/63 edition drops all but the 678/4 and adds the 702/4 which is pretty much a vertical version of the 678/4 without the reduction gear with power down 2-3hp.

    I have no idea if these engines ever flew or what they were installed in.

    A 1986/87 edition of "Jane's" has a small write up of the Porsche PFM 3200 aircraft engine which says it is the first Porsche engine since 1955 designed for aircraft use ( standard 911S engines being used in Aircraft Industries Skyship blimps). As may be guessed by the designation it is a 3200cc ( 3164cc/193 cu in) engine. It was rated at 212HP for take-off and max cont at sea level at 5300rpm. and had a 0.455 reduction gear to the prop.
    It was well equipped with proportional speed fan cooling, two 24 v alternators, tow vacuum pumps and a drive for a hydraulic pump. It had a dry sump for acrobatic use. Unfortunately it weighed 200kg (441lbs) but that may be with the accessories.

    Flight development was started in a Cessna Skylane in Aug 1943 and completed Sept 1984 by the LBA and in Aug 1985 by the FAA. A pilot production batch pf 50 engines was supposed to have been started in Aug 1985.

    That is the only information I have at this time.
     
  2. vikingBerserker

    vikingBerserker Well-Known Member

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    That is pretty interesting, I did not know they made aircraft engines.
     
  3. Shortround6

    Shortround6 Well-Known Member

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  4. swampyankee

    swampyankee Active Member

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  5. airplane176

    airplane176 New Member

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    Shortround6,

    Porsche aero engines were used by the U.S. Navy as the O-95 series. They were used in the Gyrodene YRON-1 rotocycle, DSN-1/QH-50A, and DSN-2/QH-50B anti-submarine drones. The only information that I have is fragmentary and contradictory.

    YO-95-2 YRON-1 62 HP based on Type GP 702/1?
    YO-90-4 DSN-2/QH-50B 86 HP Type 702/4?
    YO-95-6 DSN-2/QH-50B 72 HP Type 678/4
    YO-95-8 DSN-1/QH-50A 72 HP @ 4500 rpm

    There are no odd dash numbers as the Air Force did not use the type. Later DSN/QH-50 were turbine-powered.

    There is a website devoted to Gyrodene here: Gyrodyne Helicopter Co., Mfg of QH-50 series of VTOL UAVs

    Roger
     
  6. Shortround6

    Shortround6 Well-Known Member

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  7. Nick Sumner

    Nick Sumner New Member

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    There are these too

    Porshe engines.gif

    70 1935/1936 Radial 32 cylinder, 17.7 liter liquid-cooled airplane engine
    71 1935/1936 32 cylinder test unit
    72 1935/1936 V-16, 19.7 liter liquid-cooled airplane engine
    73 1935/1936 16 cylinder test unit
    55 1935 1,000 HP airplane engine S├╝dbremse, AG
    78 1937 Sleeve-valve for new airplane engine
     
  8. herman1rg

    herman1rg Well-Known Member

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    How about this car-engined plane?

    smart-diesel-1.jpg
     
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