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Century Radikal E640 - Swift 16 NX
› Birdseed modification
04-27-2004 12:18 AM  13 years agoPost 1
r1gga

rrApprentice

Palo Alto, CA

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I am having trouble finding an appropriate place to mount my birdseed on my g10 frame. An obvious solution would be to use different batteries, but ignoring this I think I could better place the birdseed if it were a different shape. I am a relative noob so am sceptical of dismantling the birdseed. Has this been done successfully / should this pose any problems? My aim is to fit the majority of the battery inside the front cage.

I also wonder if it is possible to wire my two packs together maintaining the same current and voltage, however effectively doubling the capacity and thus flight time.

Please dont hesitate to tell me that both of these ideas are stupid.

Thanks in advance,
r1gga

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04-27-2004 12:24 AM  13 years agoPost 2
pbmax

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Olympia, WA - USA

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As long as you're careful and smart about it, you should be able to disassemble the birdseed pack w/o too much trouble. Re-assembling it in a useable and elegant fashion is a bit more difficult. Might be a good time to learn how to solder batteries But if you do, remember, safety glasses are your friends. And if the batteries get really hot, disconnect them!! You probably shorted something.

I don't think the hummingbird would get off the ground with 2 birdseed packs underneath; they're awfully heavy!

Beyond that I don't think nimh packs behave well when wired in parallel, at least not for long periods of time. So if you just connect them for the duration of the flight, you should be okay.

But no, you won't get double the flight time because you're vastly increasing the weight the poor heli has to carry. If you're into doubling up battery packs, try going with lithium polymer (e-tec 1200s are a good place to start).

pbmax

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04-27-2004 12:34 AM  13 years agoPost 3
r1gga

rrApprentice

Palo Alto, CA

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Thanks for the speedy reply. I may have a go at rejigging one of my packs tomorrow! Ill let you know hows it goes or goes wrong! Out of interest does anyone use the birdseed and the g10 together (Other than me)? If so I'd be interested to know how you balance it.

Here are my current thought to a rejigging, having the 7 AAA cells next to each other lying as shown.

comments?

Thanks again

r1gga

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04-27-2004 08:41 AM  13 years agoPost 4
r1gga

rrApprentice

Palo Alto, CA

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How do I break CA bond?

Trying to pry the cells apart, but they appear to be glued together, any ideas?

r1gga

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04-27-2004 01:55 PM  13 years agoPost 5
pbmax

rrKey Veteran

Olympia, WA - USA

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You might try some CA debonder, should be available at your LHS.

pbmax

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04-27-2004 02:03 PM  13 years agoPost 6
DOKEY

rrProfessor

Northamptonshire UK

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Most common one I have found in the UK is 'Z-7 DEBONDER' by PACER

Ryan.

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04-27-2004 08:19 PM  13 years agoPost 7
Bluesilver30

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USAF Academy, CO - USA

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just get a lipo. save time, get a kick ass battery while ur at it.

i use 3c etech 1200's. with the g10 frame you cant really use 2c well, voltage is too low.

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04-27-2004 08:19 PM  13 years agoPost 8
r1gga

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Palo Alto, CA

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Success!

Ok, this is my solution:
The 7 cell birdseed was split into 2 cell and 5 cell components, linked with wire. All were nicely soldered (although soldering the battery contacts is close to impossible) with my new soldering iron! To finish I wrapped the parts in electrical tape:

If anyone attempts to repeat what I have done please note that I did not break the CA (well I did to my first birdseed, which almost stuffed it up!), instead I simply cut the green shells off the 2 cells that were removed. This has the added advantage of keeping the two cells bonded together.

Mounted in my G10 it looks like this:

This balances the bird perfectly and with some trim adjustment on my transmitter I can achieve a hover by simply increasing throttle and leaning right a tiny bit. The combination of G10 and battery placement allows me do do a no handed hover for maybe 5 seconds!

Youll see in the above pic that the antenna is mounted to the carbon frame so I get some jitters, I am trying to rectify this by moving it to the plastic legs.

r1gga

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04-27-2004 08:27 PM  13 years agoPost 9
r1gga

rrApprentice

Palo Alto, CA

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I am happy with this solution and with a fast charger and two seeds I have about 30 seconds on the ground at any one time (running to the car to switch batteries!). Flight time of about 7 minutes per seed. I am deterred from LiPos by the long charge time and anal retentativeness required for usage.

r1gga

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04-27-2004 08:52 PM  13 years agoPost 10
pbmax

rrKey Veteran

Olympia, WA - USA

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Yeah, but once you go li-poly, you never go back

Speaking of which, anyone want a lightly used birdseed?

pbmax

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04-27-2004 09:16 PM  13 years agoPost 11
r1gga

rrApprentice

Palo Alto, CA

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Apart from increased flight time all I can conclude is that getting lipos and a charger will be expensive. With my mostly stock setup what benfits would I get?

r1gga

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04-27-2004 09:58 PM  13 years agoPost 12
pbmax

rrKey Veteran

Olympia, WA - USA

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Better performance from lower weight, more overall power (3s poly packs). Otherwise, if you're happy with 7 minute flights, stay with the birdseeds.

pbmax

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Century Radikal E640 - Swift 16 NX
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