What's the rational with the MSH BEC 5.6V?

[ayash]

Why is the MSH ESC BEC output is 5.6V? and not 6V?

It doesn't take full advantave of 6V cyclic servos, too high for 4.8V tail servos and with a stepdown (which is usually 0.9) it becomes 4.7V which is low.

So why did they go for 5.6V and not the standard 6V?

[Melly]

Four fully charged Nicd or Nimh cells have 1,35V to 1,40V per cell so with 1,40V x 4 cell= 5,60V.
So the 5,6V is the best way. No step down for tail and higher voltage than 5.0V for cyclic...

p.s. 4,8V is nominal voltage, every servo rated for 4,8V must work with fully charged 4 cells (5,6V), on the other hand every servo rated for 6.0V (5 cells) must work with 7.0V.

[helical]

Yep. I'm happy that it's 5.6 and not a full 6v.

[Atomsk]

Great explanation. 5.6 V makes a lot of sense it seems :Bang

[ayash]

Tail servos work with 5.6, many also work with 6V but there are reports is shortens their life as servos at this voltage.

[Melly]

"(which is usually 0.9) it becomes 4.7V which is low...."

Usually for a step down is used a silicon rectifier diode (1N4007 or similar rated for 1A, 3W)... you could use a schottkey diode wich have a lower drop...

http://en.wikipedia.org/wiki/Diode

I run my BLS251 without a step down, better to shorten the life of a servo, than to burn a diode in flight...

[vicrc]

Looks like I need to remove the step down.... :clappp