Discussion List (Batteries)

[Bill Glaze]

Jerry:
Anything yet about the nose ring for the engine mount; anxiously 
awaiting!<G>  Bill Glaze
----- Original Message ----- 
From: "Jerry Budd" <jerry at buddengineering.com>
To: <discussion at nsrca.org>
Sent: Monday, November 21, 2005 4:25 AM
Subject: Re: Discussion List (Batteries)


> >OK, how's this:  I got seriously involved in electric power until my 
> >three
>>sets of batteries shot craps after about 25 cycles each, was going to go
>>back to IC for a while until it looked liked the batteries were going to
>>hold up better, but my source for the interim airplane and power unit got
>>later and later so I was effectively out of the loop for the season.  I've
>>kept myself busy with other stuff(good and bad)--and don't know what the
>>latest skinny is on batteries.  Anyone?
>
> OK, I'll bite.
>
> Currently, I have 84 flights on my Abbra (1st flight was July 4th), all on 
> three sets of battery packs (TP5300's), with the fllowing cycles:
>
> Battery Pack #1 - 36 flights
> Battery Pack #2 - 29 flights
> Battery Pack #3 - 19 flights
>
> On a typical Masters flight I use between 3200 and 3800 mAh depending on 
> the wind, how large/small of maneuvers I did, and how fast I flew. My 
> practice flights normally consist of flying the sequence, then two or 
> three additional maneuvers, and landing.  Every once in a while I'll use 
> around 4000-4200 mAh, but that's not the norm, usually I restarted the 
> sequence or repeated a particular maneuver a couple of extra times.  All 
> of these flights lasted < 10 minutes (my timer is set to 8 minutes).  I've 
> had no issues with the batteries, in fact each set of the batteries charge 
> up to very close to the same amount of mAh replaced after a flight 
> (comparing left vs right).  When I plug in the TP 5 cell balancer after a 
> recharge session, it barely does anything at all, just flickers for a 
> couple of seconds and then goes out.  My conclusion is that these 
> batteries are very closely matched wrt impedance (which is what I'd 
> expect/hope for).
>
> My peak current on the ground is ~70 amps and my batteries come out of the 
> airplane after a flight at less than 110 deg F.  Motor temps range from 
> 130 deg on a 70 deg day to the 150's on a 100+ deg day (I'm thinking I 
> need to do a bit more work on the baffling around the motor).  The speed 
> controller operates at ambient temps.  Here's the equipment breakout:
>
> Motor: Hacker C50-14XL
> ESC: Hacker Master 90-0-ACRO
> Batteries: Thunder Power 10s4p 5300mAh
> Prop: APC - 22x12e
> Motor Mount: Budd Engineering
>
> Thx, Jerry
> -- 
> ___________
> Jerry Budd
> Budd Engineering
> (661) 722-5669 Voice/Fax
> (661) 435-0358 Cell Phone
> mailto:jerry at buddengineering.com
> http://www.buddengineering.com
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