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Official Freewing JAS 39 Gripen 80mm EDF Jet

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  • Originally posted by Airguardian View Post
    It's not bad, but it's not great either.

    Plane destabilizes and drifts in yaw at the top of wide loops due to the lack of thrust making it lose too much speed, which is annoying.
    Acceleration after maneuvers that bleed a lot of energy (such as high alpha) is painfully slow.
    It flies and you can do stuff with it, but if you want to do things other than circle flying, I'd say get the ARF version and drop in a better combo from the get-go.

    Plus you get to use the extra weight of better, more powerful and heavier EDFs instead of needing to add useless ballast to get a decent CG. ;)
    I would agree the acceleration is somewhat slow and it does not just dart away, you have to wait for it to accelerate. To me this just makes it look more scale and less toy like, although I think most would like it the other way.

    Comment


    • Originally posted by Airguardian View Post
      It's not bad, but it's not great either.

      Plane destabilizes and drifts in yaw at the top of wide loops due to the lack of thrust making it lose too much speed, which is annoying.
      Acceleration after maneuvers that bleed a lot of energy (such as high alpha) is painfully slow.
      It flies and you can do stuff with it, but if you want to do things other than circle flying, I'd say get the ARF version and drop in a better combo from the get-go.

      Plus you get to use the extra weight of better, more powerful and heavier EDFs instead of needing to add useless ballast to get a decent CG. ;)
      I couldn't agree more. It was very disappointing to see the jet lose so much energy when going vertical. With a supposed 3.4kg of thrust and a ~3.2kg jet (with battery and ballast) I would expect it to be a little more powerful in a climb, but it's just lack luster.
      It's able to recover from stalls/ post stall maneuvering, but it scares me how slow it can be.
      I intend on slapping the TV kit on it as soon as it arrives, but with the extra weight that will add, I'm doubting the stock setup will make for a "huck-able" jet

      Comment


      • So what would a good replacement be for the stock inrunner?

        Comment


        • Originally posted by SanExup View Post
          So what would a good replacement be for the stock inrunner?
          I'm waiting for my 80mm, 2100kv inrunner from FMS.

          Comment


          • Originally posted by xviper View Post
            I'm waiting for my 80mm, 2100kv inrunner from FMS.
            If we're going off of the specifications listed by the manufacturer, the FMS unit puts out the same amount of thrust as the stock Freewing edf.

            Comment


            • Originally posted by KevinMar View Post

              If we're going off of the specifications listed by the manufacturer, the FMS unit puts out the same amount of thrust as the stock Freewing edf.
              I see different specs from RC Castle. The FW 1920kv, IR has a static thrust of 3.0 - 3.1 Kb @ 93A ....................... https://www.rc-castle.com/index.php?...roduct_id=8644

              The FMS 2100kv IR has a static thrust of 3.4 Kg @ 98A ........................
               - Rotor Blade Material : Nylon Composite With Fiber- Outer Diameter: 84mm- Length: 67.0mm- Weight: 320g- Rotor: 80mm , 12 Blade- Motor:: 3280 2100Kv Inrunner Motor (Installed)- Working Voltage: 6s  22.2v- S


              I decided to buy the ARF PLUS Gripen and put the FMS unit and ESC into it. If you want a lot more poop from your EDF, then you need to take a look at something from one of of the EDF specialists and build your own fan and motor combo.

              Comment


              • Originally posted by KevinMar View Post

                With a supposed 3.4kg of thrust and a ~3.2kg jet (with battery and ballast) I would expect it to be a little more powerful in a climb, but it's just lack luster.
                3.4kg would be test bench data. Installed with ducting losses I doubt you get more than 2.8kg. I will measure when I have a moment.

                Comment


                • Originally posted by xviper View Post
                  I'm waiting for my 80mm, 2100kv inrunner from FMS.
                  Me too. I have them in my Mirage2000, Avanti and EFlite F-4. Hard to beat for the price.

                  Comment


                  • Originally posted by kallend View Post

                    3.4kg would be test bench data. Installed with ducting losses I doubt you get more than 2.8kg. I will measure when I have a moment.
                    I've tested a few of these installed in a Mirage and Mig-21 and get ~2800-2850 grams at 25V, which drops from there.

                    Still +20% or so in thrust vs. the Freewing 1857kv fan for not a lot more amps.

                    Agree they're hard to beat for the price for 6 cells and really help heavier planes accelerate and climb better. I get about 200 ft. of extra vertical with the Mig and about +6-8 mph vs. the 1857kv FW fan. The Mirage is just a missile with this unit, although it's harder to get rearward CGs as it's also ~50 grams lighter than the older FW fan with the metal shroud.

                    Comment


                    • Originally posted by Mizer67 View Post

                      I've tested a few of these installed in a Mirage and Mig-21 and get ~2800-2850 grams at 25V, which drops from there.

                      Still +20% or so in thrust vs. the Freewing 1857kv fan for not a lot more amps.

                      Agree they're hard to beat for the price for 6 cells and really help heavier planes accelerate and climb better. I get about 200 ft. of extra vertical with the Mig and about +6-8 mph vs. the 1857kv FW fan. The Mirage is just a missile with this unit, although it's harder to get rearward CGs as it's also ~50 grams lighter than the older FW fan with the metal shroud.
                      Oh yes!

                      My Mirage weighs in at 2.4kg with battery, and has 2.8kg thrust. Missile indeed.

                      I was somewhat disappointed in just how heavy the Gripen is. Seems to be the way Freewing is going though, the 70mm F-35 V3 is a real heavyweight too, heavier than my Mirage!

                      The Gripen is nearly as heavy as my 90mm FlyFly Hunter.

                      Comment


                      • Funny how these different fans work with the different planes... this new FW 1920 in the T-33 is wonderful, but it sounds like this may not be the case in every 80mm FW airframe.

                        Comment


                        • Originally posted by kallend View Post

                          Me too. I have them in my Mirage2000, Avanti and EFlite F-4. Hard to beat for the price.
                          I put it into my FW L-39 and my old Avanti S. It made a significant difference in punch but then, the FMS EDF replaced the old FW outrunner. Nevertheless, I can only look at what numbers I find posted for a given product and comparing it to each other, it was a personal choice to use the FMS system.
                          Some people just don't seem to understand what the posted numbers (static thrust) really means and then they are disappointed when their plane doesn't blast off to the moon. If rocket punch is desired, perhaps they should be looking at a $3000.00 turbine system that a few have done.

                          Comment


                          • Originally posted by Husafreak View Post
                            Funny how these different fans work with the different planes... this new FW 1920 in the T-33 is wonderful, but it sounds like this may not be the case in every 80mm FW airframe.
                            You have to look at whether it's an inrunner or outrunner and the KV and the blade count. Today's FW 1920kv used lately are inrunners, which is more likely to spin a fan to its supposed KV, given the blades it has.

                            Comment


                            • Originally posted by kallend View Post

                              Oh yes!

                              My Mirage weighs in at 2.4kg with battery, and has 2.8kg thrust. Missile indeed.

                              I was somewhat disappointed in just how heavy the Gripen is. Seems to be the way Freewing is going though, the 70mm F-35 V3 is a real heavyweight too, heavier than my Mirage!

                              The Gripen is nearly as heavy as my 90mm FlyFly Hunter.
                              Yes, I agree. I understand bigger = easier to see and probably folks willing to pay more for not a lot greater mfg. cost. Plus, there's some truth to bigger flies better. 80mms are more efficient than 90mms too and flight time is still a concern of many, but I wish they'd stick a 90mm in what is basically a 90mm sized frame.

                              I think the Gripen is past the limit where you can get what I consider to be good performance for a 6 cell 80mm fan, which is why I'm going to up the voltage.

                              Comment


                              • Originally posted by Mizer67 View Post
                                I think the Gripen is past the limit where you can get what I consider to be good performance for a 6 cell 80mm fan, which is why I'm going to up the voltage.
                                It's not just this Gripen. Take a look at some of the EDFs going back a couple of years. They are now offering them with 8s systems right out of the box. And it's not just Freewing, either. Take a look at the Taft ViperJet. I had one of the first 6s, 90mm ones. Loved it but it was a bit anemic. If I had the space, I'd get the new 8s one.

                                Comment


                                • My set up.....chinahobbyline 6s5000 65c 839g. 3 1/4 oz of stick on lead on the bottom of the tail cone to get the cg at the mold.marks. no gyro. For maiden Canards mixed to 3 position switch 1 pos canards fixed, 2 pos pitch only, 3 pos pitch and roll. Trainer button speed brakes(elev full up,canards full down). I set all surfaces to full rates. Control rods in outermost servo arm. Absolutely crazy roll rate with ailerons only.720 deg per sec? Not much different with canards in roll. Like my beloved Eurofighter (rip) I will fly it mostly with canards in pitch only. Very smooth flying airplane . high alpha is easy,, it just crawles across the sky. 3:30 min flight time.mixed flying The speed brakes work well after touchdown but you have to be very gentle with the steering because the down force on the nose wheel adds to the tip factor. I can't wait for the TV to arrive thats the whole reason I bought it. I wish there was a pre-order/ reserve system for those of us that bought early in the pre-order with the promise of TV availability when.the aircraft arrives. I will be using some 1/4 in square pinewood derby tungsten weights to move my cg back to at least 130mm. With the TV units installed. Tungsten much heavier than.lead.
                                  Still flying P.15, avanti(#2), mig 21, yak 130 70mm(#2), f35, f9f panther, a10 64mm, F8 crusader/ PA ultimate amr /HK skipper, durafly dh vampire, p 51,spit mk24, corsair, flybeam/ BH f86 50mm, deltawing 50mm/ HH su 26 mm,umx pitts,umx sbach, blade nano cp s,blade 450x, inductrix 200, inductrix pro, umx yak 54,umx f27 fpv/ electrifly 4s L39/ flyzone beaver/ volantix asw 28, /dynam B26

                                  RIP.. roc hobby waco,strega #2(you will be missed), Fw 90mm eurofighter.

                                  Comment


                                  • I received my Gripen last Wednesday and it came in great condition. I assembled it Thursday and did the maiden on Saturday. It flew great with or without the canards activated. Canards activated definitely give her that extra turn and burn ability for sure though. She's a great flying bird with that classic menacing presence in the air that delta wings pull off so well. Thanks for making another winner Freewing and MotionRC!


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                                    • Originally posted by Airguardian View Post
                                      It's not bad, but it's not great either.

                                      Plane destabilizes and drifts in yaw at the top of wide loops due to the lack of thrust making it lose too much speed, which is annoying.
                                      Acceleration after maneuvers that bleed a lot of energy (such as high alpha) is painfully slow.
                                      It flies and you can do stuff with it, but if you want to do things other than circle flying, I'd say get the ARF version and drop in a better combo from the get-go.

                                      Plus you get to use the extra weight of better, more powerful and heavier EDFs instead of needing to add useless ballast to get a decent CG. ;)
                                      I normally never post online but I watched a bunch of your videos over the weekend and just had to say how impressed I am with your flying ability and knowledge of the sport. I will go back to my cave now and get back to work on my Gripen.
                                      Dan

                                      Comment


                                      • No-music video edit of my first proper high-alpha flight attempts:



                                        Originally posted by Dan McKeag View Post

                                        I normally never post online but I watched a bunch of your videos over the weekend and just had to say how impressed I am with your flying ability and knowledge of the sport. I will go back to my cave now and get back to work on my Gripen.
                                        Dan
                                        Thank you so much for your kind words!
                                        Means a lot to me!


                                        Originally posted by Quickstop View Post
                                        I would agree the acceleration is somewhat slow and it does not just dart away, you have to wait for it to accelerate. To me this just makes it look more scale and less toy like, although I think most would like it the other way.
                                        The fullscale jet can accelerate faster than our model.
                                        The fact that ours doesn't pack a comparable punch makes it look more toyish IMO instead.

                                        Comment


                                        • Originally posted by Airguardian View Post
                                          It's not bad, but it's not great either.

                                          Plane destabilizes and drifts in yaw at the top of wide loops due to the lack of thrust making it lose too much speed, which is annoying.
                                          Acceleration after maneuvers that bleed a lot of energy (such as high alpha) is painfully slow.
                                          It flies and you can do stuff with it, but if you want to do things other than circle flying, I'd say get the ARF version and drop in a better combo from the get-go.

                                          Plus you get to use the extra weight of better, more powerful and heavier EDFs instead of needing to add useless ballast to get a decent CG. ;)
                                          I will be doing precisely that... Currently installing a P20SX :P
                                          Freewing A-10 turbine conversion: http://fb.me/FreewingA10TurbineConversion

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