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General Discussion / Re: Winter storage- lipos
« Last post by cpaine on Yesterday at 11:55:51 am »
neat little tip i learned from some ef1 guys at the Nats, once discharged to storage voltage of 3.7v (25-30%?) is to store them in the fridge. im no electrical expert, but the theory is, the cold temps slow down the electrons in the packs... like hibernation so to speak, therefor extending life of the pack....
problem is, they take away room for my beer in my beer fridge!!! ;)
General Discussion / Re: Winter storage- lipos
« Last post by sihinch on October 16, 2018, 06:26:08 pm »
Bruce - not until Thursday!!!
General Discussion / Re: Winter storage- lipos
« Last post by bweaver on October 16, 2018, 12:08:09 pm »
General Discussion / Re: Winter storage- lipos
« Last post by mawz on October 16, 2018, 11:46:56 am »

Probably the best source is the following paper.


That clearly demonstrates the issues with storage at overly high voltages. Lower voltages really don't increase the risk in terms of damage to the battery itself from storage voltage

The real issue with storing at 25% or lower is the risk of a cell failing from self-discharge to overly low levels. The closer you get to cascading cell failure voltage as a starting point, the higher the risk of losing a cell. That's largely why manufacturers ship at 50% charge, it gives the maximum shelf life for the cells without risking damage from storing with overly high charge.

Realistically, for short-term storage (3-6 months maximum), 25% is just fine. 50% simply gives you the headroom to know the battery can be stored long-term without worries, while being a low enough voltage to not run into the well-documented issues with storing fully charged batteries.

I do store my batteries discharged during the flying season (storing between 20 and 50% charge).

Just to be clear, when I say 'storing fully discharged batteries', I'm talking 5% or less of nominal capacity. At that level you are risking damage from the low state of charge even before storing.
General Discussion / Re: Two AVROs...
« Last post by RogMason on October 16, 2018, 11:14:51 am »
That is what aviation buffs will always wonder Vic - 'What if..?'

It is such a shame, it was such a beautiful and promising aircraft.  HUGE too!!  Look at the one man Arrow compared to the 6 man Lancaster (comparison photo attached - and the Arrow is in the background!) 
General Discussion / Re: Two AVROs...
« Last post by vicwhit on October 16, 2018, 10:36:56 am »
I loved that place. The Toronto Triumph Club would often have their meetings there so we got to enjoy seeing things get done.

The Arrow was especially interesting. Boo Diefenbaker. Where would aviation in Canada be today if it had carried on? What impact would the Arrow have made? It could have surpassed anything in production at the time.

So many of those talented people went on to develop space technology and landing men on the moon.
General Discussion / Re: Winter storage- lipos
« Last post by MarcV on October 16, 2018, 01:29:41 am »
Adam, do you have the source of information for the 50% storage value?

I got my information from Sony's Lithium Ion Rechargeable Batteries Technical Handbook.  I enclose the relevant section that shows that storing a battery at "0% (3.3V)" is slightly superior then at "50% (3.8V)".

This is also backed up by personal correspondence with Walter Van Schalkwijk Ph.D. (who's written a few books on lithium ion batteries) and is a user of my battery analyzers.

General Discussion / Re: The Great Photo Thread
« Last post by Wingnutz on October 16, 2018, 12:41:31 am »
This was taken back in 2013 at a Scugog Float Flyers session. I can't find the original digital image so this is a photo of a print, but I thought the photo still merited inclusion in the thread. It's an Electrifly Seawind EP about to touch down. Water this calm would be a nightmare for a full size but for the RC pilot, it's great stuff! I'm never quite sure if it's right side up or not!
Other Events / Re: London Swap Meet
« Last post by mawz on October 15, 2018, 09:20:39 pm »

You definitely should have been there, as there was a Blaster 3 available at a good price. One of the SOGGI guys grabbed it.

But if you're looking for a DLG, I'd reach out to Doug Pike, Pat Mackenzie or Ivan Mackenzie over at COGG, they're the core of the local DLG community.
General Discussion / RC Cars for Crappers' Corner Speedway
« Last post by vicwhit on October 15, 2018, 04:23:40 pm »
A few cross-compatible RCers have asked about cars for Crappers' Corner Speedway.

In a few words...1/10 scale brushless LiPo buggies. Looking at local hobby stores and the net, you will find a wide range of prices that will get you kids junk to pro level. I am mister-in-between and my restricted retirement lifestyle will only allow something affordable, But hey, let's not sacrifice too much.
I found a local supplier that imports and sells car made in China. I could not even find a better price direct from Chinese sources. RC Hobbies Outlet offers lots of version of cars  in different sizes and styles.

My selected car is the XSTR Pro made by HSP. It comes in 11 different flavours that seem differ only by colour. The package comes complete with radio and battery. It is a great starter package as the car as several upgraded features included. I suggest buying an extra, larger capacity battery to get even more time on the track. Spare parts are available from RC Hobbies Outlet or from many Internet suppliers. You might want a few of the suspension part spares and screws/bolts. Make sure you have blue thread look and treat every bolt and nut that you want to stay on the car.


RC Hobbies Outlet https://www.rchobbiesoutlet.com/1-10-scale-electric-rc-buggy/

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