help needed first nitro heli

[invertsick]

Hi guyz,

Finally I finished building my 600N, As I mentioned this is my first nitro bird, So I have couple of things need to make clear.

I am using a OS 50 hyper as most of ppl r doin :)
How do I need to make the running in for this engine?
What is the maximum temp to reach during run in and later during normal flyin and hard 3D.
I am using the following setup and dont know how to make the connections for the voltage distribution.

On the cyclic 8717's on 8V
On the tail JR7703D with 8900 servo
throthle servo KO PROPO 2363 0.08 SPEED. ( I HAVE IT SO DONT WANT TO BUY A NEW SERVO)
And i have the spectrum dual regulator.

I think the regulator drops the voltage from the 2cell lipo to 5.5 V so I will connect one of the regultor outputs to the gyro I guess and the other to the throthl servo.

But the servo I will use on the carb operates on 6V.

How I will work this out?
I need a step up from regulator to throthle servo ? :YeaBaby:

Thank you

Serge

[chosen69]

Hi Serge,
your voltage regulator (if it is the VR5203 Dual Output Regulator) actually regulates the voltage down to 5.2V. While the align stepdown actually regulates down to 5.1V I think your JR 8900 will be able to handle 5.2V. The JR 8900 however CANNOT handle your 8V volt setup neither can the JR770 (up to 6V) so you want to put the regulator between the receiver and the gyro . The throttle servo that you are using probably CANNOT handle 8V as well so use the second slot for that one.

Jimmy

[invertsick]

Hi Serge,
your voltage regulator (if it is the VR5203 Dual Output Regulator) actually regulates the voltage down to 5.2V. While the align stepdown actually regulates down to 5.1V I think your JR 8900 will be able to handle 5.2V. The JR 8900 however CANNOT handle your 8V volt setup neither can the JR770 (up to 6V) so you want to put the regulator between the receiver and the gyro and use the second slot between the reciever and the rudder servo. The throttle servo that you are using probably CANNOT handle 8V as well so I guess you will have to get another stepdown like this:

http://www.readyheli.com/K10381A_5_1V_Two_way_Step_down_Voltage_Regulator_p/k10381a.htm

Jimmy

thanks jimmy for quick help. yes my regulator is the VR5203.
what do you mean when u say one slot to the gyro and the other to the tail servo???

How I will coonect the tail servo to the gyro in this case?

serge

[Street Flyer]

Your throttle servo probably can't handle 8V, and the align stepdown only drops the voltage 0.7Volts. So you are going to have to figure out a way to hook up the throttle servo into ur spektrum regular or buy another 8717.

[invertsick]

But are you sure guyz I will need the 2 slots of the spectrum regulator for the gyro and tail servo???

how I will connect the tail servo to the gyro???

I was thinkin that when the gyro works on 5.2 volt...
the tail servo will automaticly work on 5.2 as well as it gets current from the gyro.
Am I wrong??

[invertmast]

here's what ya do:

Rx rudder port connected to slot 1 (in) on regulator . slot 1 (out) on regulator connected to the gyro. align stepdown (probly not needed, but is good insurance) between gyro and Tail rotor servo.

Rx. Throttle port connected to slot 2 (in) on regulator. slot 2 (out) on regulator connected to throttle servo.

you wont have a problem running the 6v servo on 5.x volts

[chosen69]

here's what ya do:

Rx rudder port connected to slot 1 (in) on regulator . slot 1 (out) on regulator connected to the gyro. align stepdown (probly not needed, but is good insurance) between gyro and Tail rotor servo.

Rx. Throttle port connected to slot 2 (in) on regulator. slot 2 (out) on regulator connected to throttle servo.

you wont have a probly running the 6v servo on 5.x volts

Just like he says...

[Street Flyer]

What about the gyro gain channel?

[invertmast]

What about the gyro gain channel?

shouldn't be an issue as it only uses the signal wire and doesn't provide the gyro brains electrical power.

[Street Flyer]

Does the gain wire on the 611 provide power to the gyro?

[invertmast]

Does the gain wire on the 611 provide power to the gyro?

nope

[baddraptor]

YES, the gain wire on the 611 DOES supply power. It is a 3 wire, the red and black do supply power. You can however remove the power wire from the gain as it is not needed.

[invertmast]

YES, the gain wire on the 611 DOES supply power. It is a 3 wire, the red and black do supply power. You can however remove the power wire from the gain as it is not needed.


i stand corrected.. i just did a lil experiment by disconnecting the gyro from the rudder channel and it stays on.

but i still dont think you need the regulator hooked to both sides of the gyro.

[baddraptor]

You do need both wires from the gyro to go to the reg or the gyro will still feed high voltage to the servo.

BTW, the 611 is good for up to 6v. It is only the tail servo that is not. If you are going to run 6v regultated you only need to put a step down between the gyro and servo. If you are running more voltage than 6v put both wires from the 611 into reg and plug servo into the gyro.

You can always just run an additional step down between gov and servo if you need to step the throttle down.


PS, I wish the new spektrum mini reg was setup for 3 output instead of only 2..

[invertmast]

You do need both wires from the gyro to go to the reg or the gyro will still feed high voltage to the servo.

BTW, the 611 is good for up to 6v. It is only the tail servo that is not. If you are going to run 6v regultated you only need to put a step down between the gyro and servo. If you are running more voltage than 6v put both wires from the 611 into reg and plug servo into the gyro.

You can always just run an additional step down between gov and servo if you need to step the throttle down.


PS, I wish the new spektrum mini reg was setup for 3 output instead of only 2..


you and me both...

[Pinecone]

And don't put an Align stepdown between the Gyro and the Tail Servo when using the Spektrum regulator.

That REGULATES the voltage to 5.2 volts. The Align is not a regulator, but it is a diode that drops the voltage about 0.7 volts. Using both will put your tail servo at about 4.5 volts.

[invertsick]

Guyz,

thank for all your help.

But everyone just gave me ideas about the voltage distribution.

What about the hyper temp during the run in and later on normal flyin and hard 3d.

serge

[baddraptor]

Run it at 2 turns from closed for the first flight, it will be rich. After that start leaning 2 clicks a flight. You ultimatley want to be looking for temps of 195 to 200F on the cylinder at the base of the head and 110-115f on the backplate.

[army6192plt]

what do you mean when you say backplate?

[TheBum]

what do you mean when you say backplate?

It's the side of the engine that faces directly downward, inline with the crankshaft. The backplate is usually secured on the engine via four screws.