Junkers Ju-52/3m
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Thread: Junkers Ju-52/3m

  1. #1

    Junkers Ju-52/3m

    Hello Folks,
    This thread will be for a new CFS1 model project, to be built with AF99 and animated with
    Aircraft Animator, with support by SCASM for the virtual cockpit:

    The famous old Tante Ju, or "Auntie Ju", also known as "Iron Annie".

    The Junkers Ju 52/3m was one of the most successful European airliners ever built.
    This tri-motor (3x720 Hp BMW-132-A3 or -T radials) was designed for Deutsche Luft Hansa
    in 1932, and could carry 17 passengersor 3 tons of freight, and had excellent short-field performance.

    By the mid-1930s, European and Latin American airlines were flying them, and during World War II,
    they were the Luftwaffe's primary transports, and some served as bombers.

    A total of 4,835 Ju 52/3ms were built, as well as 170 under license by Construcciones Aeronauticas
    (CASA) in Spain (with 3x785 Hp Spanish ENMA Beta-B4 engines - licence built BMW-132īs), and over
    400 by Ateliers Aeronautiques de Colombes in France.

    The Ju 52/3m continued in postwar service with military and civilian air fleets well into the 1980s.

    My intention is to supply a Spanish version by CASA, a green camo German version as in the picture,
    and a paratrooper version that I still have to investigate the colour scheme for.

    I expect it will be another entertaining, fruitful and didactic experience, and you are all invited to
    participate, the main thing being, to have fun!

    Cheers,
    Aleatorylamp
    Attached Thumbnails Attached Thumbnails Ju52-3m_F-AZJU.jpg  
    Last edited by aleatorylamp; November 14th, 2017 at 14:50.
    "Why make it simple if you can also make it complicated?"

  2. #2
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    oh boy, this should prove interesting.
    sometimes the magic works.
    sometimes it doesn't.

  3. #3
    Hello Smilo,
    Yes, I agree!
    Iīve been doing an inventory of what we already have from other German aircraft.
    Material to be used would be the engines, engine gauges and 2-pitch, 2-blade
    propellers of the Fw200A Condor, all thanks to Ivanīs efforts and cooperation
    with that model.

    The engines on one of the earlier versions, the -G3E, are similar to those on the
    Fw200A Condor, but a slightly different variant: BMW-132-A3, with 725 Hp at 2050 RPM.
    Later versions had upto 830 Hp, and will also be taken into account to make other model variants.

    So, for a start I used the Condor .air file to make the 3-engined .air file, entering the
    Ju-52/3m-G3E dimensions and weights, and aimed for the specified S.L. base-performance,
    which is 165 mph with 725 Hp at 2050 RPM.

    Preliminary tests after adjusting Torque and Zero Lift Drag, give quite close results:
    167.1 mph, with 725 Hp at 1951 RPM.
    The slower RPM was to be expected because the Condorīs speed was 60 mph higher,
    so a slight adjustment in one of the Propeller tables will be in order, and will be no problem
    after what I have learnt from Ivan!

    At the moment Iīm putting the scale onto some very good 3-view drawings I found, to get the
    basic measurements into AF99, and hopefully I will soon be making a CFS1 toy "cardboard model"
    with coloured 2D parts, to get a general feel of dimensions and sizes, and to show a screenshot!

    Cheers,
    Aleatorylamp.
    "Why make it simple if you can also make it complicated?"

  4. #4

    Propeller and Performance Adjustments

    Hello Folks!
    Further research has revealed that the 2-blade propellers on the earler
    Ju-52 were 9.5 ft in diameter, and on the flight model, this parameter
    adjustment increased RPM a little. (The Condor had 9.7 ft propellers).

    Then, aiming for 165 mph with 725 Hp at 2050 RPM, slight adjustments
    on the propeller power coefficient table for the curves J=0.6, 0.8 and 1.0,
    as well as other very small changes in Drag and Torque, finally gave very
    close results:

    S.L. horizontal speed at full throttle is 165.2 mph, with 726 Hp at 2046 RPM,
    which is quite pleasing, and can be quite acceptable, at least for the moment.

    Now that I have a reasonably well-behaving three-engined airfile, I can start
    making the AF99 cardboard mock-up model.

    Update:
    Hello Smilo,
    Attached with this post is the new CFS1 .air file, for any trials or experiments
    you may wish. Itīs called Ju52-3m.air, and will have to be re-named it to fit an
    existing FS98 model that you may be experimenting with at the moment.

    Cheers,
    Aleatorylamp.
    Attached Files Attached Files
    Last edited by aleatorylamp; November 16th, 2017 at 08:11.
    "Why make it simple if you can also make it complicated?"

  5. #5
    Hello Folks, Hello Smilo,
    I thought it would be a good idea to have a 3-engined panel for testing as well,
    so I adapted the functional look-alike panel I did for the Condor, also fixing
    the 3-engined generic throttle gauge with better handles.

    By the way, thereīs a new .air file named Eacasa52.air (for the FS98 Spanish Ju52 model
    serving as a test-bed for the new CFS1 .air file), included in the panel folder because
    I hadnīt activated the flaps option in the previous one.

    Here is a screenshot and the panel and the panel.config with the new
    custom 3-engine throttle gauge it contains.
    The other custom gauges are in the FW200A Condor I uploaded some time ago.

    Also enclosed, just in case, is the CFS1-SDK which contains sound and panel
    config information.

    Enjoy...
    Cheers,
    Aleatorylamp
    Attached Thumbnails Attached Thumbnails Ju52Panel.jpg  
    Attached Files Attached Files
    Last edited by aleatorylamp; November 17th, 2017 at 05:29.
    "Why make it simple if you can also make it complicated?"

  6. #6

    Engine 1 and 3 angles.

    Hello All!
    On the Ju-52/3m, the only engine that is aligned parallel
    to the longitudinal axis is Engine No. 2 in the nose.
    The others are almost at right angles with the wing leading
    edge, i.e. facing outwards. The reason for this seems to be
    to make the aircraft easier to control in the event of a
    wing-engine failure.
    Also, it seems from the 3-view drawings, that they are very
    slightly
    slanted downwards.

    I had taken for granted that simulator models had to be built
    with propellers perpendicular to the aircraftīs longitudinal axis,
    but Aircraft Animator in a very able manner, appears to offer
    the
    possiblity of slanting them any way you want!

    Unless I am very much mistaken, it is only the .air file that
    positions engines at x,y,z, with no
    possibility of thrust inclination
    in any direction. I seem to remember that Jet .air files offer an
    up/down thrust angle offset, but not propeller air files.


    So, at least we can feature this charismatic visual effect.

    Hereīs a screenshot of an older FS98 model in Aircraft Animator.
    The engines in the lower part of the compound picture show the
    engines lined up perpendicularly, and the upper ones show the
    propeller axis inclination we can put in.
    I fear Iīve exaggerated the angle a bit too much - it should actually
    be slightly less than perpendicular to the leading edge backsweep.

    Of course, the propellers and engine nacelles must then be built
    according to plan,
    with the proper inclination - without perpendicular
    correction for the model!!

    Cheers,
    Aleatorylamp
    Attached Thumbnails Attached Thumbnails Ju52 engine angle.jpg  
    "Why make it simple if you can also make it complicated?"

  7. #7

    Toe-out

    Hello Folks,
    Well, it works!
    Thereīs a 5-degree toe-out and a 1-degree downward inclination
    on wing-engine nacelle components and propellers.
    The animation works well. For the moment Iīve kept it simple.
    Now I have to do the prop-axels.
    Cheers,
    Aleatorylamp
    Attached Thumbnails Attached Thumbnails toe-out.jpg   toe-out1.jpg  
    "Why make it simple if you can also make it complicated?"

  8. #8
    Hello All,
    Well, the basic shapes are there, and Iīve also got the axels on the propellers, and they look the part!
    I managed to make slanted structures for the left and right prop-axels. A bit confusing, to say the least.
    Fuselage, wheels, nose and tailfin are all structures, as Iīm saving components for everything else.
    Hereīs a screenshot showing a bit of progress - itīs got a bit of ambience already!
    Cheers,
    Aleatorylamp
    Attached Thumbnails Attached Thumbnails Ju-52 primitive.jpg  
    "Why make it simple if you can also make it complicated?"

  9. #9
    SOH Staff
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    that, she does...well done, Stephan,
    and thank you for the progress report.
    looking forward to many more.
    sometimes the magic works.
    sometimes it doesn't.

  10. #10
    Hello Smilo,
    Experimenting with nacelle structures, top and bottom halves.
    At the moment thereīs not much point, except for entertainment,
    and to get the shapes.

    Wings are still 2D, so nacelle structures behind the engines are too
    prominent, and
    too parts-hungry anyway. However, they will serve
    as the basis to make nacelle components later on when the wings are 3D.


    The cabin glass is also a transparent structure, until I get the component

    frame and the windows in there.
    Cheers,
    Aleatorylamp
    Attached Thumbnails Attached Thumbnails Ju-52 primitive2.jpg  
    "Why make it simple if you can also make it complicated?"

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