<DIV> Thanks Jim and by the way you were one hell of a great pattern flyer back in the 70's! Mike<BR><BR><B><I>JOddino <JOddino@socal.rr.com></I></B> wrote:
<BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">See my comments after each paragraph.<BR><BR>----- Original Message ----- <BR>From: "Adam Glatt" <ADAM.G@SASKTEL.NET><BR>To: <DISCUSSION@NSRCA.ORG><BR>Sent: Friday, November 21, 2003 4:25 PM<BR>Subject: Re: 2 cell Lithium polymers as your receiver pack?<BR><BR><BR>><BR>> If you run all or mostly digitals expect ~150mah per flight.<BR><BR>Find out what your plane draws. Don't take anything for granted.<BR>><BR>> Never heard of a regulator over heating. Due to bad combination of<BR>> hard-mounted pipe and DZ and weak fuselage I was drawing 225mah per<BR>> flight most of this year on a 7.4v ThunderPower 1950mah pack with a 4.8v<BR>> regulator (with a heatsink), never had any problems.<BR><BR>Regulators can overheat if they dissipate too much power. When they do they<BR>shut down. Understand your system requirements and add a heat sink if<BR>necessary.<BR>><BR>>
If you charge them at too high voltage (i.e. in nicd mode, or any<BR>> non-lithium charge mode) they will expand, and if they expand enough<BR>> they will vent and stink and be toxic and possibly cause a fire, as by<BR>> this point they are very hot.<BR><BR>Use a charger designed for your pack and you will have no problems.<BR>><BR>> Good: more capacity at lighter weight (though in the 1100mah range the<BR>> constant weight of the regulator overcomes the weight/mah of the lipoly<BR>> vs the nicd... so only existant at higher capacities). No self discharge.<BR>><BR>> Bad: dangerous and quick to be turn to garbage if mis-charged, more $$,<BR>> requires a more expensive charger.<BR><BR>Price will come down. Cells cost less than $3.00 in quantity. Chargers can<BR>be very inexpensive.<BR>><BR>> If anything, the Lipoly is good for more charges (atleast the Thunder<BR>> Power ones are).<BR><BR>In the end I believe we will change batteries based on
time, not number of<BR>cycles.<BR>><BR>> Lipolys only offer a clear advantage when they power the motor. In<BR>> everything else our batteries are already light, and you really have to<BR>> weigh the pros and cons. Though I should point out that in the ><BR>> ~1500mah range, the NiCds do become quite heavy and the lipolys offer a<BR>> real weight saving. If you want NiCds and lots (12 flights on a charge)<BR>> of flying you have to go with a smaller capacity and more than one pack.<BR>><BR>> BTW, Thunder Power is already producing batteries that make the one<BR>> Shulman used in Poland look like old news =><BR>><BR>> =====================================<BR>> # To be removed from this list, send a message to<BR>> # discussion-request@nsrca.org<BR>> # and put leave discussion on the first line of the body.<BR>> #<BR>><BR><BR>=====================================<BR># To be removed from this list, send a message to <BR>#
discussion-request@nsrca.org<BR># and put leave discussion on the first line of the body.<BR>#<BR></BLOCKQUOTE></DIV><p><hr SIZE=1>
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