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Thread: Engineer Creates the World :)

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    Default Engineer Creates the World :)

    AN ENGINEER WITH TOO MUCH TIME ON HIS HANDS

    Ron Patrick's Street-Legal Jet Powered VW Beetle




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    He Says:-

    This is a my street-legal jet car on full afterburner.? The car has two engines:
    the production gasoline engine in the front driving the front wheels and the jet
    engine in the back.? The idea is that you drive around legally on the gasoline engine and when you want to have some fun, you spin up the jet and get on the burner
    (you can start the jet while driving along on the gasoline engine).? The car was built because I wanted the wildest street-legal ride possible.? With this project, I was able to use some stuff I learned while getting my fancy engineering degree
    (I have a PhD in Mechanical Engineering from Stanford University) to design the car without the distraction of how other people have done it in the past - because no one has.? I don't know how fast the car will go and probably never will.?

    The car was built to thrill me, not kill me.? That doesn't stop me from the occasional blast

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    The car is licensed here in California.? In California, new cars have
    bi-annual smog inspections so if you modify the engine, it is likely
    to fail the inspection and you won't be able to drive it on the street.?
    There are some exempt engine modifications (ex. after-cat mufflers - big deal)
    but none that will allow you to add 1350 hp to a new car.

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    thanks 4 sharing bro...........
    repzz err.............
    If you think anything will affect "Hindu Terrorism and Rapism", you are fooling yourself, Kill them or get ready for your women to be Raped !!

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    The Beetle was chosen because it looks cool with the jet and it
    shows it off well.? Remember the Hurst wheelstanding Barracuda
    "Hemi Under Glass"?? Well, this is "Jet Under Glass".? Air for the
    jet enters the car through the two side windows and the sunroof.?
    It's a little windy inside but not unbearable.

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    Quote Originally Posted by X-MAN-S.A View Post
    thanks 4 sharing bro...........
    repzz err.............
    its k dude ....

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    Default if u are seriously interested you can read this!







    Car was built to look as if VW delivered the car this way.? It handles

    fine and is safe.? I was thinking of putting it into an import car show

    but the promoter told me that it looked too plain and recommended

    that I put some decals on it, lower it, and put on some aftermarket

    wheels.? Sure kid, put on some flimsy wheels won't take a curb and

    don't center on the hubs, lower the car so the tires rub and get cut by

    the body using springs that bounce me all over the road, and advertise

    for companies that couldn't engineer themselves out of a paper bag.?

    I would have thought the 14" diameter tailpipe was enough for him but

    I guess it wasn't.? Response from the hot rod magazines has been slow.?

    One editor told me that is because I didn't use anything they advertise.?

    But the response to driving it on the street and going to the hot rod shows

    (San Francisco Custom Car Show, Grand National Show in Pomona,

    and the Detroit Autorama) has been fantastic.? This car attracts crowds

    better than any '32 Ford, '69 Camaro, or decaled Honda.?


    The Beetle was chosen because it looks cool with the jet and it

    shows it off well.? Remember the Hurst wheelstanding Barracuda

    "Hemi Under Glass"?? Well, this is "Jet Under Glass".? Air for the

    jet enters the car through the two side windows and the sunroof.?

    It's a little windy inside but not unbearable.



    The production hatch release switch on the driver's door activates

    two new latches (one on each side) and the hatch pops open just

    like a production car.? The "hatch not closed" warning light works too.



    Here you can see the split in the tailpipe after a

    particularly rude burner pop.? All fixed and

    reinforced now.? The heat blanket keeps the

    plastic bumper from melting when the jet is operating.?



    The back of the gauge panel was kept open to give the car a techie look.?

    Something to talk about.? The car's an engineering device, let's see

    some engineering thingies.? The aluminum panel was designed in

    SolidWorks and cut out of billet, bead blasted, clear annodized, and

    then the labels for the switches were milled into the front using a font

    matching the VW cluster.? Little details like the holes having flat sides

    so the switches don't spin and exactly matching the contour of the

    dash added time to the project.? Several versions were made out of

    styrofoam first to get the layout and lighting right.? From the back,

    the panel reminds me of the 1970s McLaren CanAm cars.



    The first thing I did when I got the car was to cut the hole in

    the back for the engine.? Made a fancy jig out of a tripod, a

    rod, and a lawnmower wheel to mark out the cut and went

    at it with a pneumatic saw.? Then finished it off with

    jeweler's files.? No paint required.? Didn't even chip.?

    The hole was tricky because it goes through 3 layers

    (bumper and two layers of metal) and it's a circle projected

    onto angled surfaces.?? Just finding the centerline of the car

    wasn't trivial.? Worrying what my neighbors would say if I

    ruined the back of a brand-new car made me REAL careful.?

    I believe the hole is within 2 mm.




    There are three gauges for the jet: %RPM,

    Oil Pressure, and Turbine Inlet Temperature.?

    The most important is turbine inlet temperature.?

    If you exceed about 650 degrees C for very long,

    you damage the engine.? This is critical on start-up.?

    You don't want a "hot-start".? The throttle for the

    jet engine is located next to the gear selector.?

    It is a lever and has three buttons: Cool, Big-Fire,

    and Afterburner.? "Cool" leans out the engine and

    is used to lower the turbine inlet temperature if you

    get a hot-start.? To light big-fire or the afterburner,

    you hold a button down and 1/2 second later, press

    the hot-streak button on the floor.? Then things happen!?

    Notice the kerosene level gauge in front of the gear selector

    (jet fuel is mostly kerosene) and the bud vase missing a rose.?

    Where did it go?



    Lotsa stuff back here.? The force from the jet is tied to the vehicle

    through sandwich plates inside the car bolted to contoured aluminum

    billets that were slid into the frame rails.? You can see the billet on the

    left side with a hole in its center, welded to the plate with 4 bolts.?

    Used helium as the inert gas and a lot of current to weld that chunk

    of aluminum.? To return the car to its production height, adjustable

    spring perches were used.? Same spring rate, just corrected the ride

    height.? Drives and handles fine.? Kerosene is stored in a custom 14

    gallon, baffled, foam-filled kevlar fuel cell in the spare tire well.? Two

    fuel exits in the back: a -12 on the left side and a -10 on the right.?

    The -10 goes to a shutoff, then a Barry Grant pump (one of the few

    hot rod parts on the car), then up into the car where it sees a filter,

    a regulator, and an electrical shutoff valve before feeding the engine.?

    The -12 goes into a shutoff, then a 1.5 hp, 11,000 rpm, 24V custom

    electric pump.?? Pump is magnesium and can maintain 100 psi at 550 gph.?

    From the pump it goes into the car to a filter, then a large regulator,

    and then to the afterburner solenoid and the big-fire solenoid (to left

    of pump and feeding bottom of tailpipe through orange covered hose).?

    Fuel system was tested for flow capability.? Above the big pump you

    can see the relocated gasoline cap actuator and all that black stuff on

    the right side is the stock fuel evaporative control equipment.? All

    circuits feeding solenoids and pumps have fuses, relays, kick-back

    diodes to minimize contact arcing, sealed connectors, and use

    automotive wires of a gauge giving a maximum of 1V drop over the circuit loop.??




    The engine is a General Electric Model T58-8F.? This is a helicopter

    turboshaft engine that was converted to a jet by some internal

    modifications and a custom tailpipe.? The engine spins up to

    26,000 RPM (idle is 13,000 RPM), draws air at 11,000 CFM,

    and is rated at 1350 hp.? It weighs only 300 lbm.? It grows

    as it warms up so the engine mounts have to account for this.?

    The mounts in the front are rubber and the back are sliding

    mounts on rubber.? The structure holding the engine was designed

    using finite element analysis and is redundant.? Strong, damage

    tolerant, and light.? Second battery and fuse/relay panel on the

    right, halon fire system and 5 gallon dry sump tank on left.?

    24V starter motor is in the nose of the engine.? 700 A of current

    goes into that motor for 20 seconds during start-up.? Due to

    heat, must limit starts to three in one hour.? Big screen is to

    avoid FOD (foreign object damage).? Jet keeps ****ing the

    rose out of the bud vase on the dash!



    A lot of attention to details in the car.? Note the aluminum block

    holding/protecting the halon gas line, pull line, harness to engine,

    and oil pressure line.? Rectangular tank under inlet screen is for

    various fuel drains.? Note temperature gauge and shutoff valve

    for dry sump tank.? 3 gallons of turbine oil at $25/quart (ouch!).?

    Two-stage PPG paint matching exterior of car was used inside the car.?

    It is not easy to paint around a lot of bars, etc while crouched in a car,

    in your dusty home garage, avoiding drips, and with your wife

    screaming that the fumes will cause brain damage in the kids.?

    Especially with two-stage where you have multiple coats and

    critical drying times.? Kids passed their grades so I guess

    damage was minimal, but more importantly, the paint turned out great!



    Street racing action.? The other guy wimped out after a few "big-fire"

    demonstrations.? What you see in the picture is about one-twentieth

    the full size of the fireball.? Guy standing beside car had never seen

    it run before and was smiling ear-to-ear throughout the show.?

    Had I launched, I would have burned him to a crisp.? Well, live

    and learn.



    We get this a lot.? A police officer picking at his nose while trying

    to figure out what to charge me with.? Notice the hopeful anticipation

    of us on the right.? We're rooting for him and offer suggestions

    but unfortunately, the California Department of Motor Vehicles

    did not anticipate such a vehicle so he's out of luck.? Hmmm,

    the car has two engines making the car a hybrid so maybe we

    can drive in the commuter lanes along with the Toyota Priuses.



    The car was built in this garage.? Paint, welding, everything except

    some mill work.? That's me standing beside the engine that is out

    of the car for some fuel controller work.? The orange line is for the

    afterburner.? There's one on the other side too.? Here you can

    make out the four rows of variable inlets/stators at the front of

    the engine.? Their angle changes with engine speed and is used

    to avoid compressor stall.? There are 11 compressor stages and

    2 turbine stages.? The engine's pressure ratio is 8.3:1.? That's how

    you work on a jet engine.? Stick it on its end.? Easy to store them that way too.

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