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» Battery left at field.
Fri Aug 11, 2017 12:56 pm by Andyedmead

Battery left at field.

Thu Aug 10, 2017 9:59 pm by Andyedmead

Not sure but think I may have left a battery on the box by the strip tonight after rushing off to recover plane from field?



Note to self "don't stall a Radjet".

Andy




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Has anyone tried these?

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Has anyone tried these?

Post by Mr Moff on Wed Nov 03, 2010 11:47 am

It's nearly time to start the 700 build but I can't decide which servos to use.
I was thinking either,
JR8917HV 8 volt servo's,
Futaba brushless 451's which I have on another model,which work flawlessly.
Now I'd like 8 volt servos for the clean look without a regulator.
Now I've been looking at these,
http://www.fast-lad.co.uk/store/outrage_torq_9080_high_voltage_brushless_digital_cyclic_servo-p-9488.html
They haven't been out long so there's not much feedback available yet.
Has anyone tried these Outrage servos or do you know of anyone using them?
They also do a tail servo with a speed of 0.03 @ 8V,holy shmokes!

Cheers.
Danny.
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Re: Has anyone tried these?

Post by Andy Sayle on Wed Nov 03, 2010 1:19 pm

I've not tried them, but the specs look really impressive! It's about time the shift over to servos that are safe for use on 2s lipo voltages started gaining momentum...

As for the clean, regulator less look, have you thought of trying A123 cells? I'm going to be using a 2s 2300mAh pack on my 700, unregulated (well, apart from to the gyro/tail servo, but that will go through one of the 7100r receivers with it's internal reg....)

Andy


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Re: Has anyone tried these?

Post by Mr Moff on Wed Nov 03, 2010 1:31 pm

Hmmm I didn't think about A123's.
What's the biggest mah pack you can get for A123's?

Danny.
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Re: Has anyone tried these?

Post by Andy Sayle on Wed Nov 03, 2010 2:04 pm

There are two different cell capacities, 1100mAh, and 2300mAh. The cell voltage is 3.3v under a slight load (1 or 2C), dropping down to approx 3.0v under a heavy load (15C or so). Of the charger they are typically around 3.7v or so. Basically any servo that works okay on an un-regulated 5 cell Nimh pack, will work great on a 2s A123 pack....

They can be parallelled up to increase the capacity though. I have used them in all my jets, and a single 2s 2300mAh pack is quite capable of driving 6 high power digital servos, and a couple of lower power servos on a fairly quick moving jet. I used to have three flights before recharging, and even then I rarely put back more than about 1000mA into the pack. I suspect they might take a bit more of a battering in a big chopper, but I'm quite confident they will hold up nicely.

Electricwingman in Chester are a good source of packs/cells...

Andy


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Re: Has anyone tried these?

Post by Mr Moff on Wed Nov 03, 2010 3:32 pm

Cool I'll check em out.
They sound perfect for the bls451's.Hmm,I've just spotted the JR 8717HV full metal jackets and they also look nice,even more expensive though. Shocked
Oh Andy I forgot to tell you,chicks dig well prepared carbon fibre edges now,slop free linkages was last year. Very Happy

Danny.
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Re: Has anyone tried these?

Post by Andy Sayle on Wed Nov 03, 2010 4:24 pm

I was under the impression that chicks were going to dig big flaps in 2011.....

Andy

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Re: Has anyone tried these?

Post by Mr Moff on Wed Nov 03, 2010 4:36 pm

Ahh well,I can't comment on that as I've not got any flaps. Embarassed
I've been rummaging around and I've found this rx pack at the bottom of this page,
http://www.readyheli.com/RXTX-Packs_c_4554.html
It's a 3600 pack,although out of stock at the moment,is this also an A123 pack?

Danny.
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Re: Has anyone tried these?

Post by Andy Sayle on Wed Nov 03, 2010 5:00 pm

No, although the chemistry is broadly similar to that used in the A123 packs. Where they differ is in the A123's better handling of large current draws. Basically, the A123 cells are the next generation of Lifepo cells, due to the construction techniques within the cell itself (IIRC, A123 systems call it nano phosphates or something like that).

That said, those packs do seem to be rated high enough for use as an RX pack. They seem quite expensive though. A decent 2s 2300mAh pack should set you back about £25 or so...

Here:

http://www.electricwingman.com/2s-a123-battery-packs.aspx

Andy

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Re: Has anyone tried these?

Post by Andy Sayle on Wed Nov 03, 2010 5:01 pm

Oh, and the A123 packs take a 5C charge without breaking sweat, so if your charger can chuck out 10 Amps, you can be fully charged from flat in about 12 minutes.....

Andy

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Re: Has anyone tried these?

Post by Mr Moff on Wed Nov 03, 2010 5:14 pm

Cheers for that link mate,I think I'm gonna try the 4600 pack on my 600 then get another for the 700.
Can't wait to start the build now.Gotta scratch that itch. bounce

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Re: Has anyone tried these?

Post by Andy Sayle on Wed Nov 03, 2010 5:23 pm

4600mAh, you animal!

Andy

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Re: Has anyone tried these?

Post by Roy on Wed Nov 03, 2010 5:30 pm

Make sure that your charger can charge these cells as not all can

Roy.
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Re: Has anyone tried these?

Post by Mr Moff on Wed Nov 03, 2010 5:32 pm

Oh yes,it's gonna be a heavy little fella anyway with the prehistoric flybar so a few extra pounds shouldn't be too harsh. Cool

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Re: Has anyone tried these?

Post by Mr Moff on Wed Nov 03, 2010 5:34 pm

ROYB wrote:Make sure that your charger can charge these cells as not all can

Roy.
Cheers Roy I just double checked and it's a go go!

Danny.
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Re: Has anyone tried these?

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