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Old 09-29-2013, 10:28 AM   #1 (permalink)
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Default Building mCPX BL night blades

I bit the bullet today, just ordered £61 of bits and pieces from eBay to get these built. This is going to be a fiddly project, hope it works lol.

All being well I've got enough pieces to make 5 pairs of blades, even for me that should be enough to last all winter :-)
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Old 09-29-2013, 11:19 AM   #2 (permalink)
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Never thought of a night mcpx setup that's a great idea
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Old 09-29-2013, 01:04 PM   #3 (permalink)
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Default Building mCPX BL night blades

I'll post it up as a "how to" if the build goes well.

... and if it doesn't I'll post a "how not to" :-D
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Old 10-04-2013, 03:55 PM   #4 (permalink)
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D'oh, all the pieces had arrived, the wife's working late so I've got the house to myself, and I figured this would be the perfect night to get started on this.

... I've been sent 47k Ohm resistors instead of 47 Ohm, and two sets of male plugs instead of a male and a female.

Managed a quick sanity check though, 100 Ohm resistors work fine for the red LEDs with the battery I have, but OH MY GOD, 0805 components are tiny, and a nightmare to solder. Very glad I didn't go for the smaller sizes!!!

I've got a 0.5mm tip arriving for the soldering iron next week and I think I'm going to need it.
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Old 10-05-2013, 09:37 AM   #5 (permalink)
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Default Building mCPX BL night blades

Well I've done as much as I can I think. Tail LEDs are on, and the red blade is complete. Can't do the rest without the proper resistor and sockets :-(

Amazed at how easily it's going together actually, no problems at all so far, it's all just dropping into place.

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Old 10-06-2013, 02:58 AM   #6 (permalink)
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Default Building mCPX BL night blades

First blade totally complete. Need my resistors for the green blade and the sockets for the battery now.
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Old 10-06-2013, 11:31 AM   #7 (permalink)
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Nice job looks good. I heard with the copper tape if you crash it peels off tho that's why some use the small wires.Maybe a coating of clear packing tape if that happens?

Keep us posted
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Old 10-06-2013, 12:45 PM   #8 (permalink)
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Default Building mCPX BL night blades

Thanks for the heads up, I'll let you know how they do.

I'm not too worried about crashing though, I don't particularly expect the electronics to survive crashes and I'll be making 2 full sets of blades. If everything works well I'll probably also make 2 heads with battery sockets.

And I've got tons of spares now. I've used one 10cm strip of copper tape and have about 3m left, and I've got mounds of wire, resistors and LEDs too :-)
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Old 10-08-2013, 01:06 PM   #9 (permalink)
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What are you using for the battery power on such a small blade?
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Old 10-08-2013, 03:01 PM   #10 (permalink)
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Default Building mCPX BL night blades

Aaah, that's my secret weapon. I wanted to keep as much weight as possible off the blades, and after a bit of hunting around found a 3.7V 40mAh button cell LiPo that I'm going to mount in a socket on the head. I bought 3 of them for £5 and I think each will do a full hours flying with the two LEDs I have now, so I've got capacity to spare if I want to add more LEDs :-)

Right now the blades are complete and I'm waiting for my last delivery so I can assemble the new head. This waiting is driving me crazy, I want to fly!!

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Old 10-10-2013, 09:39 PM   #11 (permalink)
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It wouod be cool to incorporate the helimax ssl head for the night blades. It uses small connectors like that and a rotating contact.
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Old 10-12-2013, 02:39 AM   #12 (permalink)
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Default Building mCPX BL night blades

It's coming along nicely, just need to get the last bits glued together and then wait 24hrs for it to cure.

Wiring all done on the battery holder:
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The completed holder, ready to glue to the head:
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Testing my wiring :-)
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High tech mounting... No, my bad, I'm just gluing it to a spare nut:
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Old 10-12-2013, 07:08 AM   #13 (permalink)
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Default Building mCPX BL night blades

Battery powered head complete, just got to see how good my balancing is and whether this adds any vibrations.

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Waiting 24hrs to test this is going to drive me nuts!!
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Old 10-12-2013, 10:49 AM   #14 (permalink)
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Default Building mCPX BL night blades

Well as I figured I couldn't resist. Mounted everything on the heli and just had to spin it up at a low RPM to see how it looked. Was great, but the tail pushed the BL sideways into my case and I didn't have enough power to actually control it or fly away, leading to a nasty blade scraping crash on my case...

... On the plus side, the battery socket flew off the head leaving the heli unscathed, and both blade cables disconnected cleanly. The LED on one blade disappeared but only took 5 mins to solder a new one on.

After the repairs I spun it up a little more carefully to get some pictures and check the runtime. It looks like I can get 30 mins per button cell LiPo :-)

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Old 10-12-2013, 10:09 PM   #15 (permalink)
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Default Re: Building mCPX BL night blades

Looks great!!

George
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Old 10-13-2013, 02:01 AM   #16 (permalink)
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Quote:
Originally Posted by gstoneberg View Post
Looks great!!

George
+1 to that,

Side note, where did the red led go in the spinup? Haha

Decide to use two greens instead? Also, do u have a link to the batts you used by chance?

Thx
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Old 10-13-2013, 03:25 AM   #17 (permalink)
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Default Building mCPX BL night blades

The red LED is on the bottom, so I can tell which way up it is :-) If you look closely at the first picture you'll see I have red wiring to one blade, and green to the other.

The two colours should also help with side on orientation, no more confusion over which way the disc is pointing.

For the batteries just search for LiR2032 on eBay, but here are the ones I used:
http://m.ebay.co.uk/itm/321072376920
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Old 10-14-2013, 02:45 AM   #18 (permalink)
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They're working well, but you can feel the extra weight on the helicopter. It's still more than capable of 3D flight at 80% throttle but it's tamed the collective response noticeably.

They're also more robust than I expected, I lost orientation in the workshop today and ended up crashing inverted onto concrete. Apart from bending one of the connections to the battery there was no damage and everything survived in full working order.

With the basic concept proven I've got some thin CA glue on order to wick under the LEDs and joints to secure things properly. After that it's time to get this properly balanced as it's vibrating a lot now (most likely because of my impatience mounting the head battery).
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Old 10-14-2013, 09:49 AM   #19 (permalink)
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Yesterday, I decided to check around town to see if I could find that battery or similar locally. I had 0 luck but found a large amount of 3v batts, got a pack of three that was sorta high(12.99), but they a far smaller in size! I'm trying to setup a 130x night blades with them.

The batts I found are CR1616, about the same diameter as a dime, maybe a half a mm thick! But, they are only 3v. Everything seemed to be, so, what type of button battery is it that has a 3.6 voltage? I like those, just found none locally! Lol

Thx,
Seth
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Old 10-14-2013, 11:05 AM   #20 (permalink)
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Default Building mCPX BL night blades

The CR batteries are standard non-rechargeable 3V lithium batteries. The numbers gives you the size and thickness: CR<diam><height>.

Ive seen plenty of folks attach the small 3V ones like you have on the blades, but they tend to use two batteries. I wanted a rechargeable solution, with higher voltage so I just needed one cell, and with the weight off the blades.
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