Question about electronics for Raptor 90.

[Dave]

I just upgraded my R90. I am running a Futba 9351 servo for collective and two 9451 for cyclic. I also upgraded to the Duralite system with 6v regulator with fail safe HD Futaba switch. I am using a 5.3V step down for the tail servo. Gyro is a Futaba GY401 with 9254 rear mount tail servo. I have also added the elevator push/pull option (PV0463) and the collective servo brace (PV0337).

My questions are as follows:

1) Where do I put the voltage step down. Between the receiver and the Gyro or between the Gyro and the tail servo? The 401 Gyro will run on 5.3V or 6V but which one is best?

2) What Futaba servo is recommended for the throtle?

3) Is push/pull recommended for throtle servo? The Manual for my OS 91 SX-Cspec PS shows a push/pull setup but using this would require that I remove part of one of the plastic fins on the fan casing.

[frankg11]

quick answers, but I suspect others will chime in.

1. Stepdown between the gyro and tail servo. Servo needs lower voltage not the control box.

2. anything with a .20 or faster transit time if you are using a GV1

3. No need for push/pull, never ran one. There is no load on the throttle servo to worry about.

Good Luck.

[flyinfool]

1) Electrically it does not matter which side of the gyro you put the tail step down, as long it is there. Put it where it is convenient.

2) I like to have a throttle servo at least as fast as the collective. Throttle servo speed is a whole big debate on its own.

3) I use a push/pull on my throttle links ever since I had one pop off in a crash and really wished there was another one there. I have since crashed and had one of the two pop off. As long as one stays on you can still kill the engine.

[Dave]

My collective servo is 0.13sec at 6v. I was thinking of using a 3151 but it is only 0.17sec at 6v. Most of the faster servos seem to be either high torque or rudder servos which are not recommended for 6v. Futaba also makes a 3155 which is 0.13sec at 6v but it is a "slim". Does a slim servo fit in the R90?

Sounds like the push pull may be a good idea after all. I guess the fin has got to go! Too bad TT does not allow for this.

I would also like to replace the servo horns with metal. Any recommendations?

[flyinfool]

I usually use the same servo for both collective and throttle.
Not sure if the "slim" will fit, never tried it.

Can you just space the throttle arm out farther?

I use all plastic servo arms, cant help there.

[Mike C]

I'm still learning to move my stick At .17 :lol:

[Dave]

I decided on a 3151 for the throttle and have gone to the push pull as well.

I did not see a way to space the throttle arm out further so I did remove most of the bottom fin on the fan shrowd.

I had also converted my elevator to push/pull as well. What a surprize when I went to fly it! My elevator was now reversed! I did touch my tail blades to the grass when I tried to take off and broke the tail gears for the third time!

[flyinfool]

:arggg: :arggg: :arggg: :arggg: