Originally posted by Airguardian
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Official Freewing JAS 39 Gripen 80mm EDF Jet
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Originally posted by Airguardian View PostIt'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. ;)
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
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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.
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.
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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.
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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.
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.
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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.
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.
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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.
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.
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Originally posted by Husafreak View PostFunny 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.
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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.
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.
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Originally posted by Mizer67 View PostI 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.
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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.
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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 PostIt'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. ;)
Dan
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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
Means a lot to me!
Originally posted by Quickstop View PostI 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 fact that ours doesn't pack a comparable punch makes it look more toyish IMO instead.
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Originally posted by Airguardian View PostIt'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. ;)Freewing A-10 turbine conversion: http://fb.me/FreewingA10TurbineConversion
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