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Posted by: disoriented
11-11-2014, 10:41 PM
Forum: General
- Replies (10)

I tend to crash or suffer miscellaneous mechanical mishaps only on days when I've brought lots of charged lipos to the field. That leaves me with a sackful of charged batteries, and nothing but the puny 20 watt discharging capacity of my iCharger 206B to bring them all back down to storage (3.85V/cell) level.

It takes around an hour to discharge a 3S 2200mAh pack in that manner. Last Saturday I had 17 such packs with me. I went through 6 before my Trex 450 developed a strange tail wobble, which put an end to heli fun for the day.

Now, squeezing 11 hours of discharging into 6 hours before bedtime poses some serious logistical difficulties. Even worse, the only way the charger can bleed off all that energy is to heat itself up, and let its 40mm fan whirr itself to oblivion. It's slightly abusive to the charger, and that has always made me uneasy.

(With the iCharger line it's possible to add an external power resistor, but there are drawbacks which are "beyond the scope of this article".)

Enter the 150W $20 discharger from RCX:

http://www.myrcmart.com/rcx-3in1-battery...-4767.html

It uses three 50W halogen globes to handle discharging duties, which means a full 3S2200 pack is back down to storage voltage in minutes - about as long as it takes to fly it.

Here is what it looks like in action:

   

Needless to say, I forgot to take a photo during the pretty stage when the lights were all aglow Smile

The unit came with a Deans plug. Being an XT60 aficionado, I decided to unsolder the Deans plug and replace it with an XT60 on a pigtail. This photo shows the location where the Deans plug was originally soldered:

   

Overall, I'm very pleased with this discharger, and I'd recommend it to anyone whose OCD makes it impossible to leave lipos charged overnight.

It's quite an accurate 2S-6S battery checker too. I verified its voltage readouts against a lab-grade instrument. It was always within 0.01V, which is very good.

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Posted by: Too Drunk to Fly
31-10-2014, 10:33 AM
Forum: General
- Replies (4)

Hi guys,
A few months ago I bought a micro Trojan from Kelletts.
It seemed like the battery that came with it was stuffed so I bought a few more from HK, but now I think there's something wrong with the charger. The red light never goes off when a battery is in.
All it has is a red light that comes on. It takes AA batteries but can also be plugged in to the wall.
I put one of the HK batteries in it and now it seems like it's dead.

I have no receipt but I don't mind buying a cheap charger from HK.

Do you guys reckon it's the charger?
Is there a better quality charger for 1cell batteries I could get?

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Posted by: Kedumba
24-10-2014, 08:38 AM
Forum: General
- Replies (12)

Hi Everyone.
I've noticed that some mythical Stuff called Foam-board in America seems to be getting more and more popular as a building material. The guys at Flite Test have a whole range of free plans and builds using the stuff, including a really cool idea of a Power Pod that allows you to plug and play a range of different model configurations.

From what I can gather it seems to be ridiculously cheap over there, only a dollar or 2 for a big sheet. I'm pretty sure it's just a sheet of foam sandwiched between to sheets of cardboard.

Does anyone know if this stuff is available locally? I'd love to be able to play with some of these designs but I need a source of foamboard.

Thanks in advance
Mick

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Posted by: Chris Mc
22-10-2014, 09:10 AM
Forum: General
- Replies (5)

Calling on the Members expertise.

I have a Dynam Waco that's ripped the undercarriage out on 3 occasions....yeah I know, learn how to land properly, blah blah.

I was wondering if there is a lightweight filler compound that can be used to strengthen the fuse and re-fix the mounting plate.

Being central to the plane hopefully will not upset COG but obviously the lighter the better.

Any thoughts?

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Posted by: smuzz
17-10-2014, 06:23 PM
Forum: For Sale
- No Replies

Just as with the other one, I've got one of these brand new in box and I'm never going to get to build it. RRP is $130+ but it's yours for $80 if you wish. It's expensive compared to a HK model, but I prefer knowing that it's a Hacker and all the engineering has been done properly!

If you haven't got a motor+ESC or servos for something like this, then let me know because we can work out a deal for including those too.

Let me know if you're interested in this, because I'm going to post it on RCTrader as well and I'll let it go to whomever gets in first.

More information available here ...
http://hacker-model.com.au/p/8018601/ult...--arf.html

   
Image "borrowed" from Hacker web-site (again).

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Posted by: smuzz
17-10-2014, 06:18 PM
Forum: For Sale
- Replies (2)

I've got one of these, brand new in box and I'm never going to get to build it. RRP is $130+ but it's yours for $80 if you wish. It's expensive compared to a HK model, but I prefer knowing that it's a Hacker and all the engineering has been done properly!

If you haven't got a motor+ESC or servos for something like this, then let me know because we can work out a deal for including those too.

Let me know if you're interested in this, because I'm going to post it on RCTrader as well and I'll let it go to whomever gets in first.


More details here ...
http://hacker-model.com.au/p/8018606/kat...0-arf.html


   
Image "borrowed" from Hacker website.

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Posted by: secant0give
16-10-2014, 03:18 PM
Forum: General
- Replies (3)

This is it the decider!! the last race day of the 2014 series

All that aside, Marulin is a seriously good weekend away!!

Grab a RareBear, an Invictus, or anything that's fast and bring it allong for a day of racing on Sunday. Bring all on your sports or FPV gear for fun flying on Friday & Satturday, Bring your indoor flying machines too, they usually get a good run under lights in the big shed when it's too dark to fly outside

November 21, 22 & 23 mark it your diary order a RareBear, beg borrow or rebuild one, then bring it allong and fly it like you stole it !!


Post up if you keen for some practice, It's daylight saving now so Wednesday afternoons at McCoy field are looking good!!

See you there !!

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Posted by: robair
14-10-2014, 12:52 PM
Forum: General
- Replies (4)

Gday All

This will be a bit "off topic" however seeing as we spend a heap of time looking up into the sky whilst RC flying I am wondering if we have any club members who look a bit further afar, a truckload further actually?

After a very long hiatus I rekindled my love of Astronomy and purchased an Orion Starblast 6 Dobsonian telescope. Not a bad piece of kit for not much $$.
Do we have any other club members who are either amateur astronomers or would like to experience observing the heavens above?

I'd love to respectively, learn more, or, share with members the quite wonderful feeling one gets when observing our solar system, star clusters etc etc.
I will never cease to feel humbled and in awe every time I peer through the eyepiece at the magnificent universe we are part of.

Cheers
Rob B

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Posted by: symowallo
07-10-2014, 10:49 AM
Forum: General
- Replies (7)

The missus is finally sick of our lounge room being a hangar, so I'm now about halfway through building my mancave/rc workshop/shed in the backyard due to a lack of space in the living room and I'm planning to have it wired up. So I was thinking about how to handle battery charging in there. The shed is a standard steel job, and the floor is a timber deck built by yours truly. The hard part with the project is putting the foil insulation on the shed walls, as the standard shed doesn't come with an allowance for sarking.

I was thinking of building something for charging the batteries out of bricks, as I have plenty of spares. Just a few bricks mortared together in a standard pattern with a brick base. Resembling something like a pillar, and the batteries go in the middle whilst charging. And a smoke alarm on the ceiling. Lid I'm not sure about - maybe a piece of sheet metal or flashing curled over the edges to contain things in case something bad happens.

What do you guys use in your workshops?

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Posted by: secant0give
02-10-2014, 03:38 PM
Forum: General
- Replies (4)

The not to be missed Marulan I is one race day is coming up weekend after next.
If you only went to one event you’d go to this one!!

Racing on the Sunday, Practice on the Saturday and Fun fly on Friday. What a Sensational weekend it's going to be!!

For those that haven’t been it's not that far, just on the Sydney side of Goulbourn. It's a fantastic place to fly there's a 300m long paved strip and it's on the top of a hill. There are no noise restrictions and there's accommodation on site.

New commers are allways welcome bring along anything and race it !!

See you there !!

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