X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from nm29.bullet.mail.ac4.yahoo.com ([98.139.52.226] verified) by logan.com (CommuniGate Pro SMTP 5.4.5) with SMTP id 5560842 for flyrotary@lancaironline.net; Fri, 25 May 2012 20:46:16 -0400 Received-SPF: none receiver=logan.com; client-ip=98.139.52.226; envelope-from=ceengland@bellsouth.net Received: from [98.139.52.189] by nm29.bullet.mail.ac4.yahoo.com with NNFMP; 26 May 2012 00:45:42 -0000 Received: from [68.142.200.224] by tm2.bullet.mail.ac4.yahoo.com with NNFMP; 26 May 2012 00:45:42 -0000 Received: from [66.94.237.111] by t5.bullet.mud.yahoo.com with NNFMP; 26 May 2012 00:45:42 -0000 Received: from [127.0.0.1] by omp1016.access.mail.mud.yahoo.com with NNFMP; 26 May 2012 00:45:41 -0000 X-Yahoo-Newman-Id: 992318.84135.bm@omp1016.access.mail.mud.yahoo.com Received: (qmail 45773 invoked from network); 26 May 2012 00:45:41 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bellsouth.net; s=s1024; t=1337993141; bh=9aAiLZvrctZwk5OXO4+EDSatZMIOtQpk10Ew9XwtuCg=; h=X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:Received:Message-ID:Date:From:User-Agent:MIME-Version:To:Subject:References:In-Reply-To:Content-Type; b=d74c03jRuYu/iv8pq2du6VKP+r7iOPsOeUtKIlm2MUS00Y9t3aKXfiCRkU7YKiFvfCmzhqNtIM24q33OsaQKCbSXh20iP+AFEf73ZaHZPsv9ap36tof0llnESKrXdWojiDZY7V4uWQYUCorP4d4my3WWHMDazr/1Vo0dA8q0dZQ= X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: l.V_N.gVM1kka1Nf25l4g6T2YH4YZy0bEH7y21Fz973XsVC 9Ss.G_OSaQ98128sibrSBhloDdeRLSdJDnPU0d4H3laRPawz52xM_ZsdhEy8 V2GowmlRcHOegvbZ8CPpzMVV287YKx1L1K8q8kl1k2sEaYRHPac9rBIajGop qDgpK48x64KCsFiEwZBMfa7mcIXNvlmZC6YvC.M_qM62oWX291sGkmi0FxyR gVZKDz2dplZhXZH.q0WbmOIMSgL6baBLr7l4kYZwnWbyjY3Y9cwLADTGth7Z yY7ItRyMWH.jnUR8hNnkAGxnNBHvvJtHlNU6xNbqsoM4_7A.OBh.5XN.ATqE feFuqEEDz52pXfYvfGVuLaSzkKhHK4j2zVtfVQNqwSNMAwmGG9wVWIdIU9x7 PxPpcUwI2ORsLf0jaPBfh73iM4vDFynSwOVxX9HEWyWpsMk4AHlBvQeE1yz2 LXK7dCeTvkbbJhW9rFCnzPSoEl6Womd3bjLSW0yBAw00L82tMCZyIXxwbYqh Z0_F8ye1Jh48ljVjKL2O6C9o6bGgSb.nEUiCXCwNeI4g7DzHSTxsofYzSevT 7S1c- X-Yahoo-SMTP: uXJ_6LOswBCr8InijhYErvjWlJuRkoKPGNeiuu7PA.5wcGoy Received: from [192.168.10.30] (ceengland@74.240.17.192 with plain) by smtp105.sbc.mail.ne1.yahoo.com with SMTP; 26 May 2012 00:45:41 +0000 UTC Message-ID: <4FC027B3.6050009@bellsouth.net> Date: Fri, 25 May 2012 19:45:39 -0500 From: Charlie England User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20110929 Thunderbird/7.0.1 MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Fwd: Batteries References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------020409090003090302010401" This is a multi-part message in MIME format. --------------020409090003090302010401 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit On 05/25/2012 07:13 PM, bktrub@aol.com wrote: > > > > -----Original Message----- > From: Brian Trubee > To: bktrub > Sent: Fri, May 25, 2012 5:11 pm > Subject: Fw: Batteries > > > > ----- Forwarded Message ----- > *From:* Brian Trubee > > *To:* Rotary engine > > *Sent:* Friday, May 25, 2012 5:11 PM > *Subject:* Batteries > > I'm nearing the finish of my phase 1 testing, and am now looking for > replacement batteries. right now, I am using two of these: > http://www.power-sonic.com/images/powersonic/sla_batteries/ps_psg_series/12volt/PS-12180_11_Feb_21.pdf > ;. > They are on separate contactors, so I can use either or both when > flying. I use both when starting. They are two years old, and today > when I went flying I noticed that the voltage was getting down to 11.6 > volts. after landing, the voltage was up around 12.3 volts. Usually I > show around 13~13.6 volts when running. I always use a float charger > specifically designed for these batteries when the plane is put away. > Usually the float charger shows a slow charge, but when I cam back > from flying today the charger was showing a fast charge, meaning that > the batteries were discharged a fair amount. Any comments on the > suitablitiy of these batteries and suggestions on how to test them out > for holding a charge or otherwise deterining their suitablity or not > for my plane. I have a 40 amp Nippondenso alternator, and run an Xcom > radio, a terra transponder, Dynon D10, Tracys EM2 and EC2, and one > fuel pump(at a time unless landing or taking off) that draws around 4 > and no more than 6 amps. > Thanks, > Brian Trubee > > Hi Brian, I've run a Powersonic 18 AH battery in an Lyc powered RV-4, & it was 'adequate', but could have been better. They sell a 20 AH starting battery that is much better for flying (the 18 AH models are really intended for UPS, rather than starting). You won't need to parallel 2 of the 20 AH units for starting. The 20 AH unit is the same length, but slightly wider than the 18AH units, and almost identical to the Odyssey PC680's (that are twice as expensive) that a lot of RV guys use. The Odyssey is kinda the gold standard for experimental a/c starting batteries. Having said that, if you are seeing less than 13.5V in flight it sounds like you have a charging problem, rather than a battery problem. If you've been flying at less than that, the batteries have never been fully charged by the alternator (it takes close to 14 V to charge a 12 V lead-acid battery, both the old flooded cell and AGM types). It sounds like your alternator or regulator is slowly dying. The batteries may or may not be OK after fully recharging them. Charlie --------------020409090003090302010401 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit On 05/25/2012 07:13 PM, bktrub@aol.com wrote:



-----Original Message-----
From: Brian Trubee <bktrub@yahoo.com>
To: bktrub <bktrub@aol.com>
Sent: Fri, May 25, 2012 5:11 pm
Subject: Fw: Batteries



----- Forwarded Message -----
From: Brian Trubee <bktrub@yahoo.com>
To: Rotary engine <rotaryeng@earthlink.net>
Sent: Friday, May 25, 2012 5:11 PM
Subject: Batteries

I'm nearing the finish of my phase 1 testing, and am now looking for replacement batteries. right now, I am using two of these: http://www.power-sonic.com/images/powersonic/sla_batteries/ps_psg_series/12volt/PS-12180_11_Feb_21.pdf ;. They are on separate contactors, so I can use either or both when flying. I use both when starting. They are two years old, and today when I went flying I noticed that the voltage was getting down to 11.6 volts. after landing, the voltage was up around 12.3 volts. Usually I show around 13~13.6 volts when running. I always use a float charger specifically designed for these batteries when the plane is put away. Usually the float charger shows a slow charge, but when I cam back from flying today the charger was showing a fast charge, meaning that the batteries were discharged a fair amount. Any comments on the suitablitiy of these batteries and suggestions on how to test them out for holding a charge or otherwise deterining their suitablity or not for my plane. I have a 40 amp Nippondenso alternator, and run an Xcom radio, a terra transponder, Dynon D10, Tracys EM2 and EC2, and one fuel pump(at a time unless landing or taking off) that draws around 4 and no more than 6 amps.
 
Thanks,
Brian Trubee
Hi Brian,

I've run a Powersonic 18 AH battery in an Lyc powered  RV-4, & it was 'adequate', but could have been better. They sell a 20 AH starting battery that is much better for flying (the 18 AH models are really intended for UPS, rather than starting). You won't need to parallel 2 of the 20 AH units for starting. The 20 AH unit is the same length, but slightly wider than the 18AH units, and almost identical to the Odyssey PC680's (that are twice as expensive) that a lot of RV guys use. The Odyssey is kinda the gold standard for experimental a/c starting batteries.

Having said that, if you are seeing less than 13.5V in flight it sounds like you have a charging problem, rather than a battery problem. If you've been flying at less than that, the batteries have never been fully charged by the alternator (it takes close to 14 V to charge a 12 V lead-acid battery, both the old flooded cell and AGM types).

It sounds like your alternator or regulator is slowly dying. The batteries may or may not be OK after fully recharging them.

Charlie
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