R/C Tech Forums - View Single Post - SMC 4000/25C/3.7V single cell Hardcase pack.
Old 03-15-2009, 10:20 AM
  #834  
Tekin Prez
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I have some comments on this setup as the speedo manufacturer…

First we really do not like getting 8.4V from the receiver. It appears to work so far, but it is on the edge for us to deal with. We like 5V to 6V and we can deal with7V, but a full lipo supplying over 8V is a concern. A lot of people are using a 2s lipo for a receiver pack and it seems to be working, but it is not something we are in favor of.

Here is another solution that is easy, safe and works pretty good with the spec motors.

Just put a servo plug from the speedo battery post or the 1S lipo to the receiver. This gives the receiver the full voltage of the single cell lipo and adds a few tenths of voltage from a normal config. The BEC output in a normal setup is typically .3 to .5V less than the battery.

This setup does need our new 1S software ( not released yet) to ensure you have full throttle for the entire run. It works pretty good with the current software, except 189, with the slower motors. The harder you pull on the battery the sooner the throttle reductions kick in late in the run.

With the new software you be able to to leave the red wire in the receiver plug and turn the speedo switch on. The VC will work correctly and can be set for 3V in the hotwire. If you are willing to have 4v or less for the servo this may be the best setup overall in the end. Our favorite is still a booster that supplies 5V or 6V to the receiver.

Tekin Prez

Last edited by Tekin Prez; 03-17-2009 at 03:09 PM.
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