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550 Class Electric Helicopters 550 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar. |
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01-23-2016, 08:03 PM | #21 (permalink) | |
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01-24-2016, 08:48 AM | #22 (permalink) | |
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I theory it should get to 2500 easily. Regards. |
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01-24-2016, 12:41 PM | #23 (permalink) |
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And in theory it would fly very nicely at that speed. Pity that in practice it just doesn't get there (governed anyway).
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01-24-2016, 01:08 PM | #24 (permalink) |
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Mr. Mels is showing just over 2304 Governed.
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01-25-2016, 12:23 AM | #25 (permalink) |
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Has anybody actually tried governing the 730mx at 2500 rpm?
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01-25-2016, 12:36 AM | #26 (permalink) |
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I did.
It was a while ago - it takes the ESC so close to the edge of its RPM governing envelope that it doesn't govern well - and it's hard on batteries. I'd suggest the following, in order of inc cost ... 1. Run it ungoverned 2. Run the 730MX as 7S (prob need new ESC) 3. Change motor to higher Kv & lower toothed pinion (sticks with 6S) 4. Change motor / ESC / Batteries (8S) (which is what I did) But I think it depends on what you're after; some are happy pottering around at 2300 RPM and for that it's fine. Others want a lot more power and torque without killing batteries - for that it comes up pretty short as is. |
01-25-2016, 02:05 AM | #27 (permalink) |
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I guessing Alan would of had to use a higher tooth pinion, on my old 550 V2 With 600mx 1220kv I had my idle 2 at 2500 no problem. Not sure about the 730mx Iv had no experience with that motor
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01-25-2016, 03:06 AM | #28 (permalink) | |
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Some things to keep in mind though ... 1. Alan has almost perfect collective control 2. His 550 flights are very short 3. I suspect that he has an unlimited supply of top-of-the-line batteries (being a ThunderPower advocate) (so replacing batteries that get overheated wouldn't be a problem) 4. Even Alan admits that the 550 is a bit under-powered. All I can say is that I moved to a 550 from a 725W 4S 450 - 3400 RPM - 75A ESC - and lots of pitch. With the stock 550 components I just found it lethargic, no matter what I tried. In the end I was trying for 2500RPM (the minimum that gets even close to coming alive) but was killing batteries in an average of 64 flights. Just wasn't a happening thing for me -- others have been noted to pass similar comments to the effect of "what were Align thinking by releasing an 850Kv motor". |
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01-27-2016, 08:54 AM | #29 (permalink) |
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Well yesterday i disabled the gov from the castle link software and left it in fixed curves.
I'll try to test it in the next days with 90-85-90 and 100-95-100 curves to see what i get. Hope my pulse lipos will be up to the task. Regards. |
01-27-2016, 02:18 PM | #30 (permalink) | |
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Someone recently wrote (not sure if it was this thread or a similar one) that they run the 730MX on 7S and it's absolutely fine. To me that sounded like the perfect solution for this motor (so long as one uses an ESC that can handle it -- not sure if that's too high a voltage for the Talon). |
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01-28-2016, 02:57 AM | #31 (permalink) | |
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01-28-2016, 03:18 AM | #32 (permalink) | |
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In terms of battery sponsorship what I'm meaning is that if one runs a 550 at 2500 and does what Alan does then I strongly suspect that he's going to have some pretty hot batteries at the end of the flight. Hot batteries have a much shorter useful life which for us is a problem (I averaged 64 flights per 6S/5000 battery when I ran a maxed out 6S setup) - but for someone like Alan, so long as the flight looks impressive - and it's associated with Thunderpower - they'd probably be quite happy to replace his batteries after even 10 flights whereas I really want to be getting 100+ before I feel it's been good value (and not just 3 to 3 1/2 min flights either). |
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01-28-2016, 11:20 AM | #33 (permalink) |
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The 550 is certainly a battery slaughtering machine. Mine come down puffed after flights, but they're cheapo turnigy packs. They don't come down hot though, maybe warm, but never hot. My zippy compact (60C ) don't really puff though. The newer turnigy heavy duty 60-120C batteries also don't show any signs of puffing or anything after flights, so that's a nice improvement for a very cheap battery.
I've never used any 'high end' batteries though. The cheap ones seem to do just fine, especially in the 700 on 12s where they're not being murdered. I'd buy a few 6s turnigy heavy duty packs, but the disadvantage is that they are somewhat large compared to other packs of the same capacity, and I don't think they'll fit well in my 700.
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