Wiring info and setup for heli

[squibcakes]

Hi Freaks,

I need some help as I'm trying to understand the electronic setup (batteries, servos, regualtors etc) for a helicopter before I buy a kit parts etc.

My basic understanding is this:

All servos run off 4.8V (but can be run off 6V but will shorten the life).
Gyros can run between 4.0 - 6.0v so again could run off 4.8V.
Receivers can run off 3.5v - 9.6v, so again could run off 4.8v.

I could get a 4.8V battery to run everything off this having a 4.8V system however, I'm advised that under heavy loads, the battery volts wll drop and could cause the receiver to drop out. This being the case I should use a high voltage battery eg 7.8V battery (battery capacity not taken into account here).

Here's my problem, If I wanted to run the receiver directly off of the 7.8V battery (to ensure volts never drop too low) but wanted to run the servos/gyro at 4.8V via a regulator, where does the regulator go?

I know that the servos and gyro plug directly into the receiver, so would I need to get 4 regulators or 1?

Does anybody have some circuit diagrams of typical and complex wiring installations? Not the generic mud maps.

At this stage I'm interested in the 600Nitro kit with the DX7 radio and servos + GY401 S9254 to give you an idea of my hook up and I'm also confused about the 2 in1 regulator requirement??

Cheers
Squib

[TheBum]

I assume this is a nitro bird? You would have to run a Y connection off your battery, with one end going to the regulator and the other to the receiver. It would be something like this:

__________ REGULATOR +
+ __________/
\__________ RECEIVER +
PACK
__________ REGULATOR -
- __________/
\__________ RECEIVER -

[Pinecone]

You would have to put regualtors between the Rx and the servos, such as the Spektrum Voltage Regulator ( http://www.spektrumrc.com/Products/Default.aspx?ProdID=SPMVR5203 ). This setup would require at least 3 of these units.

The other way is to use a system like the giant scale guys do, which isolates the servo power source from the Rx and supplies them separately. You could do this by removing the center pin from every servo connector and conent these together with the output of the regualtor. You do also need to connect the regulator negative to the Rx negative so everything to work.

When people say that servo life is less on 6 volts, with most servos that means 5 years instead of 6 years. :) It is not something that people see in the short term.

Overall, easiest is to run everything at 6 volts regulated, with a simple step down for the gyro/tail servo.

[jgoodwin]

The voltage drop out you talk about is on Electric helis. As long as you fly with a good RX bat and make sure it is full before each flight you will be fine running a 7.4v bat and one BEC (or call it a 5amp+ linear voltage regulator). Get one that is switchable between 5, 5.5, and 6v and you are sorted. Unless you have another reason to run your RX at 7volts?

J