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My stock battery still isn't that good. I get about 4 minutes from it, and then I have to land within half a minute. Voltage after flight was 3.65V, so really pushing it a little. If I discharge the 120 OEM on my Solo Pro till that same level I can fly 7 minutes... |
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Last edited by SoloProFan; Dec 12, 2010 at 09:40 AM.
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Hi,
Took a look at the rx now. It seems to be absolutelly equal to new Solo Pro rx (only additional wires for the light): Shrink tubes on Solo Pro rx are not original. Even the date is equal (this is my newest Solo Pro rx): Now I have removed the rx from the Bravo SX, I will try to do the mod with the Zippy batteries and change the plugs. Will tell later, how it worked. Walter |
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Yes, I already knew the latest Solo Pros and Bravo SX both use RX-01. What I wonder is if older receivers would work as well. I suppose they would fly the Bravo as well, but perhaps the ESCs were upgraded on the RX-01 since the motors are bigger (main motor is bigger too, right?) and does the RX-06 also have a point where the leds could be attached?
Thanks for the nice pictures. If you don't mind, I will use one of them for the FAQ, so it is clear where the wires should go. |
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Hi,
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I checked again the batteries. I need a little more than 50% throttle (trim in center) for hovering in the beginning with the original NE battery, but you are right, after very short time I also need about 60%. It is the same with the HK replacement battery, so your thunder power seems to be better. Strange, I scaled the Original and the HK replacement batteries, the HK is a little heavier (4.60 h HK - 4.32 g NE) I wanted better batteries, so I did the mod for the Zippy 240 mAh. I used a replacement landing gear of a Bravo III: I cut the battery mounting (did not work well with a fresh scalpel blade and a new razor blade, but worked well with a good iris scissor - but not good for the iris scissor ). Little bit of filing - then it seemed ok. It should be as strong as the original landing skid, because the battery-mounting part is not fixed on the sides. It is very light (1.25 g) compared to the landing skid of the Bravo SX (1.9 g). Changed the plugs on the rx: The Zippy 240 mAh has 5.28 g It fits perfect between the canopy and landing skid: First I thought, I would have to use rubber rings - but not necessary, the zippy is easily to put in, easily to pull out, and it fits quite well, so no additional fixture is necessary. Heli without Zippy: 28.7 g: The whole heli with Zippy battery has now 34 g (33.96 g) - compared to 33.4 g with stock skid and NE orig. battery (but I took too long wires, could easily cut 3 cm red and 3 cm black, then the weight would probably be the same) But I guess, the results are not worth the effort. Advantage: the Bravo SX is not that tail heavy any more (recognizable most when putting it on the ground - with stock batteriy the heli easily tips on its tail, much better with the zippy). Flying: I flew three Zippys - fully and freshly loaded. One for "seeing how it behaves", two for taking time (only hovering, as described). I need a little more than 50% throttle for hovering. The heli is agil, flies well, do not feel any difference to stock batteries. Time: Zippy 1: 6:50 min Zippy 2: 6:51 min (really nearly exactly the same time). So this is about one min longer than with stock battery (I took 5:53 min) and HK replacement (5:20 min). Disadvantage: You have to change landing skids, if you wanna change battery types for flying, and thats not as easy as it is in the Solo Pro. Only 1 min more of flight time, that is not much for the effort (it is quite difficult to take the Bravo SX apart). Cheers, Walter |
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the zippy 240's are not good batteries
avoid them |
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Btw, I am surprised to read that your stock NE 150 mAh battery is only 4.32g. Mine is a heavy 4.70g, which makes it heavier than the HK one. Is your stock battery a "NE-BA927"? I agree with Razor here, for a real improved performance under this load, you might consider the Hyperion 240. 1 minutes extra flight time for 90 mAh extra capacity is quite bad... |
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Hi,
No offend, no problem... Quote:
Checked two ones, both original Nine Eagles NE-BA927 - 4.32 and 4.33 g. Either you have a very strange battery, or you use a wrong (cheap) scale. The weights I have measured are correct, without any doubt. Quote:
I will try the Turnigy Nanotec 160 mAh later... Cheers, Walter |
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Turnigy Nano-Tech 160 mAh: 4:55 min
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The 240 may be a nice battery in less current drawing applications, but the Bravo SX draws twice as much power as the Solo coaxes for instance, and I think that is where the Zippy 240 fails, and gives only a minute of extra time in the air. I think you should try the Thunder Power 160. It is only 4g, and has a high discharge rate, with little voltage sag. After 4 minutes I still needed about 60% throttle for hover, and when the battery was still fresh I only needed 50% throttle. I didn't push this battery too far on it's first flight in the cold outdoor conditions I was flying in. Still these results seem to indicate 6 minutes might be possible. Only drawback of these Thunder Power batteries is that they don't come with NE connector, so you have to mod one on yourself. |
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Last edited by SoloProFan; Dec 12, 2010 at 04:10 PM.
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Hmmm...
normally you cannot trust cheap scales in matters of /10 g (or g, if its a weight of some kg). But strange, the same in the HK battery? |
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Well,
guess, the Twingo, too - it is "two coaxes" and has 4 motors |
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I tested with the modified Thunder Power 160, and got almost 5 1/2 minutes from it, before the heli started a little spiral to the ground. Tail holding was excellent, I even had to trim full left since the tail was working harder than with the stock or Hobby King 150 battery, indicating voltage was better kept under load. The heli also responded better to throttle punches. Still 5 minutes with just a little time for a controlled landing was a little disappointing. Btw, also found that this modified battery had gained about 0.2g from putting the NE connector on instead of the micro JST it came with from the factory, so it is not 4.0g anymore, but 4.20g. So come on, battery manufacturers, we want a 180 mAh cell weighing just 3.8g or so. That would be better suited for this heli. |
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Latest blog entry: Eachine E200 UH-60 Black Hawk - Dual...
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The Thunder Power is something about 8 US$ - I guess, best batteries will be the cheap HK replacements. Quote:
BTW: With 120 mAh HK replacement the heli is a little less tail heavy... of course shorter flight time - but who cares changing batteries if it is as easy as in the Nine Eagles helis. They are so cheap, I guess, everybody can afford 10 or 20... Walter |
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Latest blog entry: Eachine E200 UH-60 Black Hawk - Dual...
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Indeed,
this is a thing I do not like in the Nine Eagles batteries at all. Now I have several different types of NE connectors (even the 150 mAh with crest from the planes). I had to modify my first charger, now I have to modify most of the batteries... Old type, new type, HK type (which is too big - but not the fault of Nine Eagles), I still use one "old version landing gear" for one of my Solo Pros. There it is easier to put the batteries in, because it is outside of the canopy (get a better grip). In the Bravo SX this is more problem, because the canopy covers the battery mounting and you cannot clip it that firm with your fingers as it is possible in the Solo Pro. Walter |
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