Multirotor, multicopter and quadcopter discussion - The Drone thread

d_brennen said:
Nice one Genoma. What sort of thrust are you getting out of the 1804s + 5030 2 blades? Does it feel a little sluggish? Haven't had a spare moment until today and it's been bloomin raining all day
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Hard to say if it feels sluggish as I'm a newbie, for me it seems super quick, full throttle and it rockets into the sky. I can't say I've noticed much difference from the three blade config. I will at some point try some 5040s just to compare.

FYI I wouldn't hang hopes on SimonK delivering stability going down. Mine wobbles descending in a straight line with RCX ESCs which claim to be running SimonK.

Maybe these smaller quads can't hack it after all there is inherently little thrust being applied when it's coming down so the FC doesn't really have much to use to stabilise against... My crappy theory anyhow.

I do want to loose some weight though as with the 1500s I'm edging towards 500g. I think a complete rebuild with solder rather than plugs is my next rebuild. I also want to add some standard LEDs for orientation but haven't found a circuit/resistor config to hang off LEDs off the Lipo, seems like a lot of current to hold back off the poor LED. Wonder if I can power it from the ESCs BEC output. Also those LED strips sound like they would work.
 
Genoma said:
FYI I wouldn't hang hopes on SimonK delivering stability going down. Mine wobbles descending in a straight line with RCX ESCs which claim to be running SimonK.
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It has a lot to do with prop wash. You can reduce wobble by descending while moving in any direction so the leading props are getting "clean" air. Faster ESCs should handle it a bit better... But probably not enough in this size craft :(
 
Russinating said:
Also do you know how to power the Immersion RC? It's got a red 2-pin plug that I've not seen before.
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You'll need to wire in a 12V UBEC to power it (steps down the 22.2V main battery). Don't try and power it directly from the 6S main battery or you'll burn it out. The connector is a JXT plug by the way.
This is one of the reasons I went for the DJI AVL58 instead. It plugs straight in to the iOSD Mk2 with no messing about.
 
I think all the latest ImmersionRC TXs can be powered from 6-25V. The older ones 16V. I would guess they have own built in voltage regulation as they output 5V for cameras etc.

In theory it would be ok :) (25.2 off load from 6 cell ?)
 
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Thanks Rilot. We haven't actually received the iOSD yet either. And yep, JXT is the one.

Shame it can't be powered up by the A2 with a standard 3-pin like the Immersion can be.

So if I was to get this - http://www.hobbyking.com/hobbyking/...n_1_Heli_5A_UBEC_Low_Voltage_Alarm_3_6S_.html - then how would the 6S plug into that? And would I then need a male JXT cable to solder onto the other end?

Alternatively would it be possible to just power up the Immersion straight from the A2 with a JXT -> 3-pin cable/converter?
 
The A2 PMU (contains a BEC to power flight controller and radio RX) supply's only 5V, not enough for your video transmitter.
 
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The S1000 has a bunch of XT60 connectors for things like retracts yes? If so, just solder up a cable with XT60s on the ends to take a jump from the main power. That's what I did with my UBEC.

By the way, as you're using Futaba I'd seriously consider using an external receiver rather than the A2's built in one. Then you can use an eFuel-Gauge so you will know exactly how many mAh you have used. I have a similar item on my S800 (FrSky FAS-100) and it takes all of the guess work out of voltages and flight times. I don't know why on earth DJI thought that a built in receiver that doesn't support any kind of telemetry was a good idea. Telemetry is utterly vital when you've got £5k in the air.
 
Flukester said:
The A2 PMU (contains a BEC to power flight controller and radio RX) supply's only 5V, not enough for your video transmitter.
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Thanks.

Rilot said:
The S1000 has a bunch of XT60 connectors for things like retracts yes? If so, just solder up a cable with XT60s on the ends to take a jump from the main power. That's what I did with my UBEC.

By the way, as you're using Futaba I'd seriously consider using an external receiver rather than the A2's built in one. Then you can use an eFuel-Gauge so you will know exactly how many mAh you have used. I have a similar item on my S800 (FrSky FAS-100) and it takes all of the guess work out of voltages and flight times. I don't know why on earth DJI thought that a built in receiver that doesn't support any kind of telemetry was a good idea. Telemetry is utterly vital when you've got £5k in the air.
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Yes it does, however we're yet to receive the DJI iOSD MKII which should, based on its spec, deliver voltage as well as all the usual telemetry data to the observer/camera op's monitor. Or is that not right?

Also just checking that I've just read that the iOSD "also has a built-in BEC module that supports 3s-6s LiPo batteries". So could I power the ImmersionRC from this?

Sorry for all the questions, it's a shame the manufacturers don't supply hardly any information (like finding out the Immersions plug is called a JTX would have been nigh on impossible without personal knowledge).
 
Good thinking the iOSD outputs 11.2V @ 1A max :) (when using a 4 to 6 cell batt)

The 600mw ImmersionRC for example consumes 3W of power, so 3/11.2 = 0.267mA (0.267A) ....well within spec.


The iOSD mini (and iOSD v2) shows real time voltage and you can gauge when to land from that, I turned off Naza voltage limits so I can decide when to come down, not the software. that eFuel Gauge sounds a very good idea though... actually knowing how much is left in a pack rather than guessing from voltage drop.


edit: I feel your pain, half of my F550 build time was spent on google :)
 
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d_brennen said:
Nah, this one: https://sites.google.com/site/miniquaduk/home/shop
It should also appear on HK for $16.99 at some point too.
As for battery life, on 1300mah 3S 45c batteries I fly up to 5 minutes when fully laden with FPV gear. I read of some going a bit longer, up to 7 minutes with 6" 2 blade props, but I am not sure how accurate that is. The Mobius, vTX and power regulator probably amount to 100g or so, which accounts for roughly a 25% increase in bare take off weight. I'd rather a 30 second battery swap than ragging my batteries tbh.
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Thanks :)
How do you know it will appear on HK? It's no doubt enevitable but for that price? That's nearly 50% of what MiniQuadUK charge.

I'll spec up a build tonight and post it up to see if it can be (on doubtedly) improved.

d_brennen said:
this is the one I was referring to
http://www.myrcmart.com/product_info.php?cPath=249_247&products_id=6194
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Thanks. Think I'm gonna go for that MiniQuadUK one when it's pay day.
 
I've been in contact with Danny and Sue from Diatone
the wholesale price for the FPV250 frame is $3.73 without the cage and $7.26 with :D The RRPs are $9.99 and $16.99
and was considering becoming a stockist. For the likely minimal return and huge effort, tax implications and general headache of dealing with Joe Bloggs, I decided I prefer flying them than flogging them :)
 
100 pieces minimum order. Still not huge money, I just haven't the time. I did set up a wordpress website for it though, but then did half a dozen others :p
 
What Flukester says is spot on about voltages. Because different batteries have different internal resistances there's a lot of trial and error when trying to work out how much juice you have left from the voltage of the pack. Only a current meter can tell you this.

With regards to the iOSD voltage output, yeah, didn't think of that. But seriously, consider ditching the Immersion and get an AVL58. It's so simple to set up and gives you the ability to switch channels while the bird is in the air if you get interferance.

eFuel Gauge and turn off the A2's voltage warning is the way forwards.
 
Tell me about it Rilot... flying at beach I took a pack a little too far forgetting time taken to get back to shore. Voltage was dropping so fast it was crazy, went all the way to 9.9V ouch.

Strobon LEDs fitted, man do these kick out some power :-)

 
Rilot said:
What Flukester says is spot on about voltages. Because different batteries have different internal resistances there's a lot of trial and error when trying to work out how much juice you have left from the voltage of the pack. Only a current meter can tell you this.

With regards to the iOSD voltage output, yeah, didn't think of that. But seriously, consider ditching the Immersion and get an AVL58. It's so simple to set up and gives you the ability to switch channels while the bird is in the air if you get interferance.

eFuel Gauge and turn off the A2's voltage warning is the way forwards.
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I'm generally fairly cautious with my packs, I've ruined a couple being too cavalier with voltages and learned the hard way (damaging packs and one small fire). I've seen a couple of mAh meters about but they are generally upwards of 50g and an awkward size/shape, which is fine for larger quad/tricopters but my interests lie in the micro FPV end of the spectrum. Do you know of any micro variants Rilot?
 
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