I have another question. Forgive me for being such a pest.
If (mAh / C) x 60 = Time in minutes. You are simple divideing the stated capacity of the batt(mah) by amp to leave the time. So it seems to me that based on how many amps you draw decides how long the pack will have output. The formula you gave is a linear function so it would seem to me that i should be able to incorporated into the watt formula. V*A=W. I dont exactly understand why I'm wrong on this.
In your previous post you gave an example of 220w for required power @ hover. If the gearing is adjusted to keep the headspeed the same & the heli requires 220w @ given headspeed. Then couldnt you say:
220w=11.1v*C ; c=19.8amps & 220w=14.8*C ; c=14.9
(2.2ah / 19.8a) * 60 = 6.7min & (2.2ah / 14.9)*60 = 8.9mins 8.9-6.7=2.2 2.2/6.7=.33
It seems that this shows the same 33% gain in power. Whether you gear for more flight power or longer flight time.
Another way I look at it is each cell stores X amount of energy. A 3s pack has 3*Xenergy & a 4s has 4*Xenergy. Should be a 33% gain in stored power(or watts).
Yet with the TP packs I checked out the heli only gains 5-6% weight.
The reason most people don't go to 4S is because of expense. Batteries are more expensive, the controllers are more expensive, and you need a motor that won't cook on the extra voltage as well, and these motors are typically pretty pricey.
Shouldnt a controller rated for 16v (align35g) handle the 4s fine? It would be running less amps through it @ a higher voltage. & if headspeed it geared to be the same from 3s to 4s, shouldnt the wattage be the same?
I am starting to guess that it must be that most motors are the problem. Would they just spin too fast for their design? What motors are people getting to run well @ 14.8v? I have searched around and found little specs on motors(as far as voltage ratings). Also the only stuff I find online about people running 4s setups is folks running CRAZY headspeeds.
I am looking for normal headspeeds & longer flight times.
Anyways what do you think? Also I really appriciate you guys being so helpful. Everyones input means alot to me. Thanks, Noah
