SpartanRC DS760 Gyro Review and Setup Vids

[Angelos]

As controversial as this may sound I think the S9254 will work as good as the S9256 since they have the same torque and speed spec. But maybe a little hotter due to the lack of metal case. The shorter pulse gimmick does not appear to yield any benefit as the savings are negligible compared to the delays caused from the inertia of the motor windings and the helicopter as a whole.

-Angelos

[mporlier]

As controversial as this may sound I think the S9254 will work as good as the S9256 since they have the same torque and speed spec. But maybe a little hotter due to the lack of metal case. The shorter pulse gimmick does not appear to yield any benefit as the savings are negligible compared to the delays caused from the inertia of the motor windings and the helicopter as a whole.

-Angelos

That is one honest answer

[Angelos]

That is one honest answer

No honesty is needed from my side. We provide the short pulse mode to make it possible for customers to use any servo they wish. All I am saying is that you don't need to buy the more expensive 760uSec servo if you can find a cheaper 1520uSec servo of the same or better speed and torque spec.

-Angelos

[Finless]

Hmmm Angelos.... You mean speed not torque no? Tail servos usualy do not need a bunch of torque but the faster the better no?
As for the pulse rate I wont argue that one.

Bob

[Angelos]

Bob, I did mean both. Of course the tail does not need as much torque as cyclic but still you will be surprised how much it needs. Also it is very common that one direction needs more force than the other due to drag imbalance in the tail system. Some people put longer bolts for the tail blades that stick out on one side to balance the drag thus ease the workload of the servo. Of course speed is very important and for hard 3D you will at least need to aim close to 0.07sec/60deg no load speed or better. However, if the servo is bogged down due to load its operational speed could also be improved with extra torque.

-Angelos

[chaz.marc]

how do I get the setup videos.. I have done the cookie thing ..still cant find them PLEASE HELP..Thanks

[ClayK]

how do I get the setup videos.. I have done the cookie thing ..still cant find them PLEASE HELP..Thanks
What do you mean you can't "find" them?

Vids are in progress and I plan to use this on my Trex600N and later on a Trex450.

So here we go!

Overview and whats in the box!
Video Link ->DS760 Gyro Overview (43 Megs) (http://video.helifreak.com/?subpath=finless/spartanrc&filename=ds760_overview.wmv)

Flashing New Firmware in the Gyro
Video Link ->DS760 Firmware Flashing Process (25 Megs) (http://video.helifreak.com/?subpath=finless/spartanrc&filename=ds760_flashing.wmv)

Gyro Setup using the Radio
Video Link ->DS760 Setup Process (65 Megs) (http://video.helifreak.com/?subpath=finless/spartanrc&filename=ds760_setup.wmv)

PC Configuration Software Overview
Video Link ->DS760 PC Configuration Software (15 Megs) (http://video.helifreak.com/?subpath=finless/spartanrc&filename=ds760_software.wmv)

In a few weeks the gyro PC software should be available and I will show how to use that. This weekend I should be able to shoot some flying and testing of the gyro.
In the mean time here is the Trex600 enigne break in and tuning video I shot last weekend. I am using the gyro in this video. There is a little flying at the end of this video:
http://video.helifreak.com/?subpath=...me=breakin.wmv (http://video.helifreak.com/?subpath=finless/trex600_nitro&filename=breakin.wmv)

[nono]

Bob, I did mean both. Of course the tail does not need as much torque as cyclic but still you will be surprised how much it needs. Also it is very common that one direction needs more force than the other due to drag imbalance in the tail system. Some people put longer bolts for the tail blades that stick out on one side to balance the drag thus ease the workload of the servo. Of course speed is very important and for hard 3D you will at least need to aim close to 0.07sec/60deg no load speed or better. However, if the servo is bogged down due to load its operational speed could also be improved with extra torque.

-Angelos

That's sound good, infact the speed of servo is better with less torque.
According to me the speed that we read in techincal information is a average between max speed ( torque=0 ) and min. speed ( torque max )


Bye

[Finless]

Angelos yes I do know how much force sometimes can be required to move the tail. Especially with metal tail grips. That force you are talking about is not drag it is called the "tennis racket effect" and the weight mod is called Chinese Weights. The weights balance out the grips and remove the tennis racket effect. I was pretty involved with this mod recently and it has become a big discussion topic.
Kevin (fireup) started it with this thread:
http://www.helifreak.com/showthread.php?t=41309&highlight=chinese

We have probably modded 1000 tails for people now :)

I check all my helis now for how strong this effect is. Each heli is different and usually plastic tail grips don't have near the force needed that metal tail grips do.

Anyway I understand this for sure and I wouldn't be surprised if we start seeing more heli manufacturers balancing their grips now :)

Bob

[nikpro]

Don't know if I have a problem with my Spartan Gyro; it has done this three times now-

I switch on the heli and let the gyro set but when I've started the engine (Nitro) and the governor starts to kick in the gyro moves all the way to the right causing the tail to spin out of control.

I am using a DX7 radio and have checked the set up but I know it's not this because 90% of the time it is fine.

I also notice when this happens if I apply full left rudder the servo moves the slider right accross but when I release the rudder stick the servo moves all the way to the right!

The Blue LED indicator is illuminated to show AVCS mode when this happens so I also know it is set right - any suggestions?

[OICU812]

Don't know if I have a problem with my Spartan Gyro; it has done this three times now-

I switch on the heli and let the gyro set but when I've started the engine (Nitro) and the governor starts to kick in the gyro moves all the way to the right causing the tail to spin out of control.

I am using a DX7 radio and have checked the set up but I know it's not this because 90% of the time it is fine.

I also notice when this happens if I apply full left rudder the servo moves the slider right accross but when I release the rudder stick the servo moves all the way to the right!

The Blue LED indicator is illuminated to show AVCS mode when this happens so I also know it is set right - any suggestions?

Did you bind with the rudder stick full left as mentioned?

[jurassic5]

Hi,

What is the reasonable gain to setup on my 760 for my TREX500 ? I have a JR like DX6/7 like radio. As an example I'm running 40% on a GY401 on my TREX450.

Where do I set the speed of the pyro as a reasonable value too for my 760 on the TREX 500 ? I mean yesterday on my 450 I went inverted, but as the gyro pyro is MAD fast, it's like a banana !!!! slippy!

Cédric

[highland flyer]

Hi Cedric. My settings in a Dx7 are as follows.

Gyro gain = 38%

Rudder ATV = 125% each way.

I have also moved both the Acc/Dec sliders to approx 1/3rd position. I have also reduced the Expo setting to -25% to suit my taste.

Servo is a 9257 9 mm servo arm

cheers Brian

[jurassic5]

Hi Cedric. My settings in a Dx7 are as follows.

Gyro gain = 38%

Rudder ATV = 125% each way.

I have also moved both the Acc/Dec sliders to approx 1/3rd position. I have also reduced the Expo setting to -25% to suit my taste.

Servo is a 9257 9 mm servo arm

cheers Brian

Hi Brian,

125% in rudder atv should mean more travel adjust ... I set up low/high margins with my 760 ... so I don't get why getting more ATV ..

Expo should be the key... what is the acc/dec sliders stuff you are talking about ?

Cédric

[highland flyer]

Hi Cedric.. The rudder ATV is what controls the piro speed..The higher this setting the faster the model is allowed to piro.

Note:- It does not increase/decrease the available travel on the pitch slider this was set during your initial setup which teaches the Gyro it's max available travel.

The Rudder ATV % tells the gyro the Maximium speed it is allowed to piro at...i.e. How many degrees a second rotation.

The Acc/Dec settings are in the Gyro software and can only be used via the USB dongle. Also the Expo I was refering to is also in the software and not the radio..

hope this helps Brian

[jurassic5]

Hi Cedric.. The rudder ATV is what controls the piro speed..The higher this setting the faster the model is allowed to piro.

Note:- It does not increase/decrease the available travel on the pitch slider this was set during your initial setup which teaches the Gyro it's max available travel.

The Rudder ATV % tells the gyro the Maximium speed it is allowed to piro at...i.e. How many degrees a second rotation.

The Acc/Dec settings are in the Gyro software and can only be used via the USB dongle. Also the Expo I was refering to is also in the software and not the radio..

hope this helps Brian

Hi Brian,

Sure it does help :D

So first i'm gonna put 80% ATV on my rudder. This should be enough ?

Cédric

[highland flyer]

Yes C`edric, It will be fairly slow at 80% but better that than to fast initially. Once you have flown it just increase/decrease the % to suit your flying style/ability..

Enjoy Brian

[flymustangs]

Angelos,

Are you shipping to dealers this week? I'm anxiously awaiting stock on these.

Thanks.
Ken

[Angelos]

Yes, lots went out today and more going out tomorrow. They should reach the shops in a few days.

-Angelos

[Sam2b]

Some have told me the Futaba GY611 simply does not stand up to the pirouetting consistency of the Spartan DS760. Can any of you confirm this after testing back-to-back, or after allot of GY611 use with pirouetting maneuvers in wind, etc.

I currently use a GY611 on my 600N, and the tail has never blown out, even with severe rotor head bogging. So I'm pleased so far. However I have not pounded heavy pirouetting 3D maneuvers with my 600N yet. My DS760 should arrive soon, and I will install it on my Trex450. But I think I will test drive it on the 600N too.

I'm sorry if I missed this topic while browsing this long thread. Thanks.

[Finless]

Ummmm..... I wish I was good enough to tell you that honeslty... But I am not.
In my opinion this gyro is one of the BEST out there like the 611... You can tell this by using it even without being a Szabo.... It just has that "feel" if you know what I mean?
Since you have one on order please share your experience when you get it!

Thanks,
Bob

[psindrup]

What gain settings are you guys using with the T-rex 500, DX7 and ds760 combo?

Peter

[Angelos]

Quote from the recently updated user guide >

The optimal gain value is a function of several parameters including rotor
speed, tail rotor diameter, tail blade efficiency, servo arm length, servo
make/model and mechanical design of the aircraft. As such, it is not
possible to make a general recommendation and the gain will need to be
adjusted experimentally. Starting with a gain of 30% should provide
enough stability to at least hover; however you should always proceed
with care. If insufficient stabilisation or tail wag is seen the gain should
be raised or lowered respectively. The optimal gain value is the highest
value you can reach that goes not cause tail wag at any time during flight.

-Angelos

[psindrup]

Thanks Angelos

Peter

[Finless]

Ha... in fact gain is not a "how can get higher gain" thing! In fact lower to some extent is better! I often wonder why some folks ask me "Bob why do I have to lower gain so much on this heli when my other heli is in the 40's"
Understand it's about how well you tail holds NOT about how much gain is needed! More does not mean better and in fact could mean a problem! However when I say this it is in reason. 5% gain aint going to work either if you get what I mean....

Bob