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  1. #1
    Tuggs's Avatar
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    F-89 Scorpion from Air-C-Race

    Hello RCU Community!

    I am very passionate about military jets from early 50’s to the 60’s. Especially the F-89 Scorpion does it for me, mostly because of its very exceptional design. I knew that I would build a turbine powered F-89 scale model someday, despite the fact that proper kits and plans are somewhat rare to find.

    There is currently one manufacturer I know of producing a quite large F-89 ARF kit here in Germany: Air-C-Race. The kit itself is available for quite a while now, but due to its massive size, I was reluctant to buy one yet.

    Having flown piston engine models from Air-C-Race in the past, I know that the kits are of a very good quality and that the customer service from Michael has always been great. So why not hop in the car and have a look at the kit before I make the final decision to buy one?

    Since there isn’t much info about this impressive kit here on RCU, I decided to share the build with you guys. I hope to have the model airborne by the end of the summer.

    Specs:

    Scale: 1:6,7
    Wingspan: 106”
    Length: 100”
    Weight: approx 44lbs (depending on single or twin turbine power)

    Alright, enough of the talking. Let’s see some pics. I am going to decide between one of those 3 color schemes below.

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  2. #2
    Tuggs's Avatar
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    RE: F-89 Scorpion from Air-C-Race

    The model is delivered in a sturdy box with the dimensions of 65"x40"x24,5". All parts are well packed and covered. To my surprise the wings, tiptanks and elevators come with high-quality wingbags.You would really not believe that a model of that size fits in such a "tiny"box.


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  3. #3
    DelGatoGrande's Avatar
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    RE: F-89 Scorpion from Air-C-Race

    Best Regards George
    www.rcjet.gr \"props are for boats\"

  4. #4
    Tuggs's Avatar
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    RE: F-89 Scorpion from Air-C-Race

    The fuselage itself is splits into two parts as you can see on the pictures. Both parts are placed snug fit in the box to prevent shipping damage.The fuselage and tail come together via drive in nuts - this already done at the factory. You just have to screw the halves together via 4 M4 screws.

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  5. #5
    Tuggs's Avatar
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    RE: F-89 Scorpion from Air-C-Race

    .. and the tail section. The fiberglass work is outstanding. Carbon fiber is used in all relevant places and all plywood formers are of a very high quality. The elevator comes in one piece and has to be glued on the tail section.To make the job easy a small edge marks the perfect fit for the elevator segment.
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  6. #6
    Tuggs's Avatar
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    RE: F-89 Scorpion from Air-C-Race

    The nose section is also removable. You can access your RCStuff via the cone which is held in place by magnets. It'll be important to mount as much of the RC /turbine electronics in the front to achieve the CGwithout the use of much lead. Ihope the job will be easier for me as I am most likely going for a single turbine configuration.

    The nose junction als serves as nosegear mount. The whole nosecone plywood constructions is properly layered with carbon fibre.
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  7. #7
    Tuggs's Avatar
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    RE: F-89 Scorpion from Air-C-Race

    All flying surfaces are pre hinged via steel pins at the factory. The servo mounts for the flaps are already in place located inside the gear well for easy access and maintenance. Aileron Servo is mounted through the wing-tip. All you need is a long screwdriver and patience to measure correctly (or a good eye). The tip-tank mount fits perfectly. A little loctite on the screws, some alignment and you're all set.

    The gear mount in the wing itself is solid. I don't like the job of hinging the gear doors, so I'll possibly start with that to have it off the list. I'll post details about the retract units later tonight.

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  8. #8
    Tuggs's Avatar
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    RE: F-89 Scorpion from Air-C-Race

    The kit also comes with a fiberglass cockpit tub. The canopy frame is also held in place via magnets so you don't have to come up with any kind of hinges or lock/unlock mechanism (unless you want to build a sliding canopy). What I really like is that the canopy frames are pre-cut and no further work apart from some fine-sanding is necessary. You can see some of the surface detail on the canopy frame. Besides, the whole surface detail of the model is quite nice.There is decent level of panel lines, rivets and hatches modelled on the surfaces.
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  9. #9
    Tuggs's Avatar
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    RE: F-89 Scorpion from Air-C-Race

    Some more pics of the intake and turbine mounts. You will notice the fuel tank which is already built in and plumbed.The fuel tank can carry a massive load of 20,3 oz fuel which equals to 6 liters (I think). The turbine mount is prepared for either single-or twin turbine as previously written. All plywood formers for single conversion are included in the kitI will go for a single 180Nturbine with a bifurcated tailpipe.
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  10. #10
    Tuggs's Avatar
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    RE: F-89 Scorpion from Air-C-Race

    Packed up and ready to carry the baby home. Although I am not 100%set on the finish yet I also picked up some decal sheets. Michael is also cutting them himself, so Ithink"custom"decals won't be a problem. The build will start during the weekend I hope. I will of course spare some more details about the landing gear first.


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  11. #11
    schroedm's Avatar
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    RE: F-89 Scorpion from Air-C-Race

    Great looking quality!. Enjoy the build and post pics as you go!

  12. #12
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    RE: F-89 Scorpion from Air-C-Race

    Hi how much for the decals? Looking for one set for mine 1/4 scale panther jet will you send me the contact thanks.

  13. #13
    Tuggs's Avatar
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    RE: F-89 Scorpion from Air-C-Race


    ORIGINAL: sysiek

    Hi how much for the decals? Looking for one set for mine 1/4 scale panther jet will you send me the contact thanks.
    Check with Michael Sieck from ACRfor pricing. Details here www.acr-composite.com

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  14. #14
    Tuggs's Avatar
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    RE: F-89 Scorpion from Air-C-Race

    Alright. A few words on the servo mounts in the tail section. The whole servo installation will only take a couple of minutes I think. The servo slides into the laser cut plywood support plate and is then inserted into the rudder /elevators. I will use Futaba standard sized servos and there is absolutely no trimming necessary. The servo has a very tight, slop-free fit and the only work left to do is to cut out the slot for the servo arm. Pretty mean design, I think.
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  15. #15
    Tuggs's Avatar
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    RE: F-89 Scorpion from Air-C-Race

    Here is another picture of the servo insterted into the mounting tray. What i really like is the tight fit because I initially had concerns that the servo would generate slop. Since the plate is pressing the servo tightly in place, this is unlikely to happen.
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  16. #16
    Tuggs's Avatar
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    RE: F-89 Scorpion from Air-C-Race


    ORIGINAL: DelGatoGrande


    Here is one for sale




    http://www.rcuniverse.com/market/item.cfm?itemId=924354













    .
    Why do you sell that beauty?

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  17. #17
    Tuggs's Avatar
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    RE: F-89 Scorpion from Air-C-Race

    Some pictures of the landing gear which can be purchased as a set directly from ACR as well. Originally my plan was to use Behotec C-50 electric retract units, but the "home-made"retracts from ACR looked really good so I picked them up as well. The oleo legs are a work of art and the big alloy weels have a nice scale appearance. Due to construction layout, the noseleg is mounted on the nosecone which leaves the noseleg in a not-so-scale position. Apparently it is quite easy to move the leg back to the scale position but I have yet to decide if its worth the effort.
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  18. #18
    LGM Graphix's Avatar
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    RE: F-89 Scorpion from Air-C-Race

    I love the scorpion, one of those so ugly its beautiful jets for me. Looking forward to seeing it come together.
    remember when people actually BUILT their airplanes?

  19. #19
    Tuggs's Avatar
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    RE: F-89 Scorpion from Air-C-Race


    ORIGINAL: LGM Graphix

    I love the scorpion, one of those so ugly its beautiful jets for me. Looking forward to seeing it come together.
    Yeah, its pretty much the same for me. It is one ugly jet but that makes it so beautiful :]

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  20. #20
    Tuggs's Avatar
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    RE: F-89 Scorpion from Air-C-Race

    By the way, some close ups of the alloy wheels ...I think they match up with the full scale nicely. I hope I can start with the first build pics tomorrow or on Friday at the latest. Got to clean up my workshop and get some bits and pieces first. Wheels are 7 1/4 "diameter.
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  21. #21
    Vincent's Avatar
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    RE: F-89 Scorpion from Air-C-Race

    ORIGINAL: Tuggs

    Some pictures of the landing gear which can be purchased as a setย* directly from ACR as well. Originally my plan was to use Behotec C-50 electric retract units, but the ''home-made''ย*retracts from ACR looked really good so I picked them up as well. The oleo legs are a work ofย* art and the big alloy weels have a nice scale appearance. Due to construction layout, the noseleg is mounted on the nosecone which leaves the noseleg in a not-so-scale position. Apparently it is quite easy to move the leg back to the scale position but I have yet to decide if its worth the effort.
    I cant understand why the german gear makers all have pins for mounting the struts. It makes setting up the toe so much harder and once you grind a flat spot it virtually eliminates your chances of adjusting the toe as the gear wear in.[:@]
    Vin...

  22. #22
    Tuggs's Avatar
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    RE: F-89 Scorpion from Air-C-Race

    Vin,

    I couldn't agree more with you. I had the same headache when I wanted to convert my CARFMig-15 retracts to behotec.... Balls, no chance to mount the struts onto the mechanics. I also prefer to clamp the legs in the retracts rather than using the tiny allen screws to fix them. But yeah, somtimes you have to cut corners.

    -T
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  23. #23
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    RE: F-89 Scorpion from Air-C-Race

    Nice project, my Dad was a RIO (radar intercept officer) in the 437FIS so I am familiar with the Tiger and missile motif. The F89 and F94 and F101 were flown by him in ADC (Air Defense Command). Thank God the Russian Bombers never came! I really remember the bright orange flight suits they wore. So if you put pilot figures in that would be cool, and don't forget to put little cigars in their chest pockets...

  24. #24
    Tuggs's Avatar
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    RE: F-89 Scorpion from Air-C-Race


    ORIGINAL: husafreak

    Nice project, my Dad was a RIO (radar intercept officer) in the 437FIS so I am familiar with the Tiger and missile motif. The F89 and F94 and F101 were flown by him in ADC (Air Defense Command). Thank God the Russian Bombers never came! I really remember the bright orange flight suits they wore. So if you put pilot figures in that would be cool, and don't forget to put little cigars in their chest pockets...
    wow!Thanks for sharing that information here. I have to admit that the 437 FISis my preferred scheme. The yellow/ black on the tips look awesome. If you have photos of the F89 your dad flew feel free to post them here and I will use them as reference for my model.

    Thanks again.


    Edit:Found a pic, but apparently the wingtips and nose is somewhat green and not yellow...

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  25. #25

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    RE: F-89 Scorpion from Air-C-Race

    Hi Tuggs,
    for sure you will have a lot of fun to build and to fly this nice plane.
    And there is so much room for scale applications.
    I never had a plane faster ready to fly than this one.

    So have fun :-)
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