🚀 go-pugleaf

In article <C04rCB.2K2@csn.org>, eeak@teal.csn.org (Ed Krejcik) wrote:
> Happy New Year!
> 
> First let me say thanks to everyone in this newsgroup. I have always
> received quality answers to my questions. So, here are a couple more
> questions:
> 
> 1) I need a second battery pack for my Airtronics receiver. I was thinking
>    I could save a few bucks by buying a battery pack and connector and
>    making one. The question is, the Airtronics Rx battery pack is 500 mAh
>    and the Tower packs are 600 mAh. Is this difference harmful?
> 
 I'll take a stab at explaining this one:

  First, the mAh ratting of a battery is basically the amount of current the
battery can supply for one hour.  So a 500 mAh battery can supply 500 mA for
one hour (or 0.5 amps for one hour.  One milli-Ampere is 0.001 Ampere).  A
600 mAh battery should be able to supply 600 mA for one hour.  This is an
increase in capacity of about 20 percent.
  Assume that you can get about ten 15 minute flights from your current 500 mAh
battery.  This would indicate that your flight pack (receiver plus servo's)
draws about 50 mA.  500 / 10 = 50.

  So, a 600 mAh pack should provide:

        600 / 50 = 12

 about 12 flights.

  So, the 600 mAh pack has the capacity to provide more power, or the same
power over a longer period of time.

  I hope this helps (and that I didn't make any mathmatical errors)!


> 2) I have an old K&B 40 Torpedo. It runs great and is in great shape. I want
>    to put it on my CGM Eagle II. Unfortunately, the Torpedo is from the days
>    before mufflers. Can anyone recommend a good aftermarket muffler? 
>    Hopefully one that will extend outside the engine compartment?
> 

  Sorry, I can't help with this one!


 Rich
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