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Warp 360 Compass Warp 360 Model Helicopter Discussion |
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12-13-2012, 01:32 AM | #1 (permalink) |
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Join Date: Jul 2012
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Brown out with Koby 40 ESC on the bench
Just a heads up:
Edit: forgot the most important part; this is with DS92A+ on cyclic and DS95i on the tail. A while back Joachim from Captron posted a technique in the Helicommand forum to generate a high-current situation in order to test if a BEC is sufficient. The technique is simple: bring the both sticks to a corner and quickly let go (I.e let them bounce around). Lo and behold my astonishment when I found out I can consistently make my spectrum sats reset using the technique above. This is without the links attached to the servo arms, I'm not sure if the dampening actually would lower or increase the amp draw. One can debate the real world applicability of the test, but I will pick up a separate high current BEC before I maiden my Warp...
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12-13-2012, 02:49 AM | #2 (permalink) |
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Thanks for the info! Bummer...have a Koby 55 sitting ready to go but now I'm afraid to use it. This BEC thing is pretty ridiculous. Ordinarily, some of the BECs that have been shown to be unreliable with the MKS servos would be used on a MUCH larger helicopter without problems.
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12-13-2012, 03:14 AM | #3 (permalink) |
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Join Date: Sep 2010
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I was running the Koby 55A without any problems for 10 flights (with Futaba). Unfortunately I put my Warp in the ground, dumbthumb, it came down inverted head first....
Bend the boom, broke the canopy standoffs, blades broken but worst of all, damaged an Elco of the Koby I already have her ready for another go but this time with a YGE 40A. Hope that BEC will not fail.
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12-13-2012, 03:21 AM | #4 (permalink) |
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Join Date: Apr 2004
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I am still surprised considering the Koby BEC is rated at 10 amps peak, if I remember right.
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12-13-2012, 04:43 AM | #5 (permalink) |
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Join Date: Dec 2010
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Have the same servo combo and decided to go with YEP 45A plus a 250mah buffer pack for cheap insurance.
Glad you found it on the bench.
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12-13-2012, 05:18 AM | #6 (permalink) |
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I'm using the Koby 55 for DS95(i)+Mini VStabi, too. No problems so far, although I'm wondering now whether I should install some green caps to buffer the BEC...
@kalleh: at what voltage setting of the Koby's BEC did you perform your bench testing? According to Kontronik, 5,6V is the "safest" setting, although in theory, at an higher voltage the servos should need a lower current to do the same work. BTW, I did all flights of the Warp at 6,0V so far. |
12-13-2012, 09:51 AM | #7 (permalink) | ||
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Quote:
Quote:
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12-13-2012, 10:24 AM | #8 (permalink) |
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Join Date: Jan 2008
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Well this is not good news...Why are we spending crazy money on Kontronik ESC's if they are not up to task? I have the Koby 55 and it was very very pricey at $189-$179 (don't recall the exact amount).
I am running one Satt VS two wonder if that's an issue? I have the 92A+'s and the 95i on the tail with a mini V-bar and one satt so far so good but I have not pushed it yet. I will try it on the bench today and see what I get. I had high hopes for the Koby 55...
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Angelo |
12-13-2012, 10:41 AM | #9 (permalink) |
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Location: Midland, Michigan
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Please, no offense, but I am not yet convinced this is a representative test for actual flight loads. It is not realistic to let tx sticks snap from the corners in flying the model.
On the other counterpoint...several have been flying the Warp with 40 and 55 Kobys without any such problems.
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12-13-2012, 10:43 AM | #10 (permalink) |
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Join Date: Aug 2010
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The Ice Lite 50 is rated for 5A with peaks of 10A and it was triggering my low voltage / brown out alarms on my Skookum SK-720 on just connecting the battery and testing the swash directions in pre-flight checks. The Castle logging was showing current spikes in excess of 10A in slow circuits.
Koby 40 and 55 are only rated at 3A (the entire Koby series is rated the same). Seriously guys, get a BEC and be safe ... yeah, it's going to cost you some extra deniros, but better that than repair costs from a crash, or worse yet, wiping out your electronics in process. |
12-13-2012, 10:50 AM | #11 (permalink) |
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Yep, I agree. You did leave out an important thing, Jeff: The Koby is rated at 3A continuous with 10A peaks.
Scott
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12-13-2012, 11:10 AM | #13 (permalink) | |
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Quote:
This BEC looks like it would work: http://helidirect.com/western-roboti...age-p-4667.hdx
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12-13-2012, 11:33 AM | #14 (permalink) |
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Join Date: Aug 2008
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All the people with brownout reports seem to be using the ds92A+ servos. Anyone using a Koby with ds95s and are also having brownouts? I have a feeling that the ds92A+s may be major power hogs. Eric B beat my Warp pretty good on the Koby BEC with ds95s on cyclic and 95i on the tail and all was fine.
Jason
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12-13-2012, 11:42 AM | #15 (permalink) | |
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Quote:
I'm stocking and using this one as it's rated for 10A (20A peak): http://www.western-robotics.com/herc...r-mini_hp.html That's possible ... but ... very similar power train, so .... ?? I'll ask Thomas after the holidays. They're shut down as of today until after Christmas. |
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12-13-2012, 11:53 AM | #16 (permalink) |
Join Date: Mar 2011
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One thing to consider is on my other 450's that use the mks92a/95 I use the 12mm hole which takes alot more torque then when set at 15 mm hole and if your swash/ball links are tight it will max out amps!
Steve |
12-13-2012, 12:06 PM | #17 (permalink) |
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I have 2 identical Warps, except one has a Koby 40 and the other a 55, only because 40s were out of stock.
I have almost 80 flights on one and 10 on the other. There are no issues with the internal BECs on either of them.
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12-13-2012, 12:09 PM | #18 (permalink) |
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LESS is probably what you mean. That's is a very good point but one needs to consider the total system in order to make comparisons. Yes, you're using a longer servo arm but the swash OD is larger also. Is the total pitch at the blade grips (cyclic and collective) significantly more than other similarly sized helicopters?
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12-13-2012, 12:10 PM | #19 (permalink) | |
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Quote:
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