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E-flite . Next D . Fast Lad Performance

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RJX Hobby Hurrican 50 - Xtreme 50 > Spartan DS760 - WOW
 
 
ez2bgman
Elite Veteran
Location: N'awlins, LA

I received my DS760 and USB cable this passed Thursday and immediately yanked the Logictech 6100 out. Installation was very easy and straight forward. Normally I do not use the factory mounting pads, but I decided to give it a try with the DS760. I also chose to keep the Logictech 6100G servo installed to use with the DS760.

Set up was very easy. Prior to pluggin in the 6100G servo, I set the DS760's frame rate for it. Once that was done, you pug the servo in and set the gyro direction and then the individual left/right endpoints. After the initial set up, I went ahead and plugged the DS760 into my laptop via the USB cable to check the settings. Everything was set correctly. I didn't make any changes to the advanced setting because I wanted to see how well it performed out of the box.

I proceeded to test the DS760 on Friday, the first day of our fun fly. At first the gyro was very quick doing right piro's and stops. But it was very slow doing left piro's and stops. To be safe I brought the X50 in. At the bench, we discovered that the 6100G servo had a deadspot while moving the stick left. It would go to full travel sometimes, and other times it would appear to get stuck. I yanked the 6100G out and reset the gyro to use a 9254. Once I went through the set up again, I plugged it into my laptop to verify everything was properly set.

Back on the flightline, I got her light on the skids to check everything. Then I brought her into a hover (still in normal flight mode) to check out the tail further. Once everything was working properly, I flipped the switch to Idle 2 (2150 rpm) and proceeded to do some fast left and right piros. With the Rudder ATV's set at 130% on my X9303, the piro rate was very fast (much faster than the Logictech 6100). The stops were very crisp with no bounce back at all.

Unlike the Logictech 6100, the DS760 is not hypersensitive around center stick. Because I sometimes bump the rudder during tic tocs and fast pitch pumps, I added 20% expo to the rudder. With 20% expo, I still had a very good feel around center but did not bump the rudder during pitch pumping maneuvers.

The DS760 holds the tail better than any other gyro I have flown (including the 401, 601, CSM 720, Logictech 6100...). Left and right piro's felt the same. And as I stated earlier, the stops are amazing. Tail slides are nothing for this gyro. Backwards hurricanes were also very easy. This was all accomplished with just the basic set up and a Futaba 9254 as the servo. I did not change any of the advanced parameters with the USB cable.

After the 4th flight, I noticed that the carbon tail rod was missing a chunk and had split. Upon further inspection, I noticed the tail rod guide had turned on the boom, allowing the carbon rod to rub on the bolt head of the horizontal fin mount (I installed the horizontal fin mount upside down for a cleaner look, since I don't use the horizontal fin). The piro rate and stops are so quick and crisp, that the force turned guide. This had never happended on my Xtreme 50 with the Logictech 6100. I was vrey fortunate that the carbon rod did not break completely on me.

Another great feature of this gyro is the ability to be upgraded. As new firmware is developed, you can easily update the DS760 with the USB cable. No other stand alone gyro has this feature, that I am aware of.

If anyone is looking for a new gyro, I would not hesitate to try to get a DS760. While quantities are limited right now, I would get on a waiting list. It is well worth the wait.

Gary
RJX of USA
Magnum Fuels
SwitchGlo
>Hot Girlz in da gallery<
03-31-2008 10:17 AM
HOMEPAGE  
 
 
Autoeject
Key Veteran
Location: Ashtabula, OH, USA

Glad you like, Gary,
As you note, you'll want to make sure your tail is up to the stops when you really crank up your piro rates. I too was amazed at the stops when I first installed one. Out of the box, they were crisp and dead on.
I tweaked my deadband just a bit to control my twitch around center. I thought it felt a little more natural than expo w/o changing the feel. Could be just me, though

Mark Webber
wai-rc.com
Spartan RC Distributor
Outrage Helicopters
03-31-2008 11:39 AM
 
 
Rockohaulic
Elite Veteran
Location: Valencia, CA, USA, 3rd Rock from the Sun

Quote 
I set the DS760's frame rate for it.

I take it you can do this without the need of the cable and computer?

Nice write-up! Can't wait to get mine!

Glad to see you not make any advanced settings and fly it straight out of the box. Gives you and us a good reference to start with.

Have you ever flown with a Solid-G gyro? How does your new Spartan compare?

I got a helicopter for my girlfriend,
It was a good trade!
03-31-2008 09:07 PM
 
 
Rockohaulic
Elite Veteran
Location: Valencia, CA, USA, 3rd Rock from the Sun

BTW - Are you going to try it with a narrow pulse width/high frame rate 9256 or BLS251???

I'd like to see how it compares with your 9254...

I got a helicopter for my girlfriend,
It was a good trade!
03-31-2008 09:08 PM
 
 
ez2bgman
Elite Veteran
Location: N'awlins, LA

Mark,

Thanks for the info. I will try to adjust the servo dead band and see how that feels. I may soften the stops just a tad (maybe 5-10%) to see how that feels as well.

Rock,

I may try an 8900 later. Angelos (the designer of the DS760) has already stated that you will hardly feel any difference between the 9254 and the 9256/9251/8900. I believe him because the tail was very locked in.

Gary
RJX of USA
Magnum Fuels
SwitchGlo
>Hot Girlz in da gallery<
03-31-2008 11:35 PM
HOMEPAGE  
 
 
Rockohaulic
Elite Veteran
Location: Valencia, CA, USA, 3rd Rock from the Sun

Quote 
Rock,
I may try an 8900 later. Angelos (the designer of the DS760) has already stated that you will hardly feel any difference between the 9254 and the 9256/9251/8900. I believe him because the tail was very locked in.

Wow - if that's the case, then the smart thing to do is buy the least expensive of the tried and true tail servos!

I got a helicopter for my girlfriend,
It was a good trade!
03-31-2008 11:40 PM
 
 
Jason Bell
Elite Veteran
Location: San Diego, Ca

Gary, very nice write up, IMO it should be put in the Electronics section of RR, and not hidden away in the RJX section. Its a great gyro, and finally people are realizing it, and buying them like mad! And finally the public can get some as well.

Just remember, dont be shocked by the low gain. I am at 29% (in travel adjust) on my aurora, and 29% as well on my trex 500. And I started at 60% on each heli!

Team Avant
Team ElyQ
Flight Power USA
Aerospire
Vblades
04-01-2008 12:14 AM
HOMEPAGE  
 
 
Rockohaulic
Elite Veteran
Location: Valencia, CA, USA, 3rd Rock from the Sun

torkboy

What did your heli do when the gain was initially set at 60??

I understand from the RC Heli magazine write-up that this gyro behaves differently at high gains than other gyros. I think it wasn't a wag issue as much as the piro rates were very wierd.

Did you experience that?

How did you arrive at the value of 29%??

I got a helicopter for my girlfriend,
It was a good trade!
04-01-2008 12:47 AM
 
 
Jason Bell
Elite Veteran
Location: San Diego, Ca

No, both of mine actually wagged.(A smidge not full blown wag like you expect)

When I got to what I thought was a good number(31%) I was experiencing tail wag in fast backward hurricanes, so I dropped the gain some more, and did them again, and the wag had stopped.

Team Avant
Team ElyQ
Flight Power USA
Aerospire
Vblades
04-01-2008 12:53 AM
HOMEPAGE  
 
 
Autoeject
Key Veteran
Location: Ashtabula, OH, USA

Mine's on a 9254 and doing well. I'm certainly not the pilot that Jason is so he'll likely work one of the better/faster servos than I. Even at 60%, mine didn't wag in hover. I didn't see any wag until backward flight. Just dropped it down until it went away.
I just switched to V's TST blades and now I need to back my stops down just a bit. Before, I didn't have any bounceback out of the box. The V's must be too slippery. Still, it's not much of a bounce at all.

Mark Webber
wai-rc.com
Spartan RC Distributor
Outrage Helicopters
04-01-2008 01:18 AM
 
 
Angelos
Key Veteran
Location: nr Oxford, OX11, UK

Quote 
I understand from the RC Heli magazine write-up that this gyro behaves differently at high gains than other gyros. I think it wasn't a wag issue as much as the piro rates were very wierd.

I think what the author of the article wanted to say is that with the gain set too high the gyro will not wag in hover but it may do as it yaws. However, since the heli is already rotating it will not show as wag (continuous rapid change of direction) but as a steppy response. Effectively it is the same thing. Just lower the gain until it goes away and you will be fine.

-Angelos

Spartan RC R&D - Visit us at our local club www.helicollective.org.uk
04-01-2008 01:21 AM
 
 
rsalazar
Key Veteran
Location: Florida, USA

Gary, where did you buy the gyro?
I am using the Solid G, because nobody had it in stock.

I guess, I will try it on the Xtreme 90
04-01-2008 03:13 AM
 
 
ez2bgman
Elite Veteran
Location: N'awlins, LA

I had my on back order through www.webberaerialimaging.com. I know they are expecting another shipment in very soon. Contact Mark (RR screen name Autoeject) to get on a list. Believe me, it is well worth the wait.

Gary
RJX of USA
Magnum Fuels
SwitchGlo
>Hot Girlz in da gallery<
04-01-2008 04:35 AM
HOMEPAGE  
 
 
ez2bgman
Elite Veteran
Location: N'awlins, LA

Quote 
No, both of mine actually wagged.(A smidge not full blown wag like you expect)

When I got to what I thought was a good number(31%) I was experiencing tail wag in fast backward hurricanes, so I dropped the gain some more, and did them again, and the wag had stopped

I started at 60% gain as well. I would notice a slight wag coming out of a high tail slide. I lowered the gain to 40% and haven't touched it since. It no longer wags at all.

Gary
RJX of USA
Magnum Fuels
SwitchGlo
>Hot Girlz in da gallery<
04-01-2008 11:12 AM
HOMEPAGE  
 
 
rsalazar
Key Veteran
Location: Florida, USA

Gary, Thanks very much for the info
04-01-2008 04:55 PM
 
 
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RJX Hobby Hurrican 50 - Xtreme 50 > Spartan DS760 - WOW
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