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Revolution Models . CarbonXtreme . Midland Helicopters

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Radio - Servo - Gyro - Gov - Batt > 770-3D Question
 
 
helinut4ever
Senior Heliman
Location: Knoxville, Tennessee-Knox

My Posts This: Topic  Forum		Can someone tell me how to adjust this gyro to where the tail won't bounce when you stop it hard? On a Futaba 401 you use the Delay control, what do you use on this gyro?
11-07-2009 02:13 AM
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george0079
Elite Veteran
Location: Tired of the politics

My Posts This: Topic  Forum
Quote 
what do you use on this gyro?

About 70% expo....

I can please 1 person a day.
It's NOT your day.
Tomorrow's not lookin good, either
11-07-2009 02:22 AM
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helinut4ever
Senior Heliman
Location: Knoxville, Tennessee-Knox

My Posts This: Topic  Forum		Ok, you mean the expo function on the rudder correct? That also controls the piro rate of the heli, so at 70% expo you still have a good piro rate? I'm at 55% now so I guess I'll crank it up some more and see how it feels!
11-07-2009 02:53 AM
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george0079
Elite Veteran
Location: Tired of the politics

My Posts This: Topic  Forum		Expo does NOT control the piro rate. Rudder ATVs, or end points, control the piro speeds.

Expo controls the sensitivity of the stick, around center.

I can please 1 person a day.
It's NOT your day.
Tomorrow's not lookin good, either
11-07-2009 02:56 AM
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helinut4ever
Senior Heliman
Location: Knoxville, Tennessee-Knox

My Posts This: Topic  Forum		OK, I'm sorry. I meant the D/R function controls the overall piro rate of the heli, and the ATV's are used to make the piro rate in each direction the same. So the Expo function would not interfere with the Dual Rate function, cool!
11-07-2009 03:12 AM
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helinut4ever
Senior Heliman
Location: Knoxville, Tennessee-Knox

My Posts This: Topic  Forum		I tried cranking the Expo up on the rudder channel but that didn't solve the problem, still when there's a sudden stop of my tail it wants to keep bouncing! Sometimes to the point to where I have to set the heli on the ground to get it to quit! I had the expo as high 85% and that didn't work, is something that I'm missing?
11-08-2009 02:34 PM
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fast400
Senior Heliman
Location: shelby twp. michigan

My Posts This: Topic  Forum		expo does nothing but deaden the center most point`s of the stick.
D/R will slow down the servo
endponit/atv`s will also limit the servo`s speed and direction`s.
sound`s to me you have the gain to high.

crash`s come easy patience`s doesnt
11-08-2009 02:46 PM
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helinut4ever
Senior Heliman
Location: Knoxville, Tennessee-Knox

My Posts This: Topic  Forum		You know, I thought about that and now that someone else has the same thoughts that's the next thing I'll try. My tail was wagging and I dropped the gain enough to stop that so I thought that's where my gain should be, maybe it's still too high and causing the servo to bounce and go into a wag until I set it down. I'll try turning down the gain some more and let you know if that solves the problem, thanks!
11-08-2009 03:03 PM
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helinut4ever
Senior Heliman
Location: Knoxville, Tennessee-Knox

My Posts This: Topic  Forum		fast400,
You were absolutely right, I still had to much gain in this 770-3D gyro. I had it set on 67 in the gyro menu on my DX-7 so I backed it down to 60 and that stopped the bounce/wag when the tail stopped suddenly!! That problem is solved but I still have one more that I need some help with. This problem acts the same but it's with the opposite stick, my elevator/aileron controls. When I move the stick either to the left or the right and let go of it ofcourse it springs back to center, but when it hits center the servo acts like it's quivering for a few seconds almost like the tail was doing. It causes the heli to wobble for a few seconds but then it quits! Any ideas on this?
11-08-2009 11:14 PM
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fast400
Senior Heliman
Location: shelby twp. michigan

My Posts This: Topic  Forum		what servo`s are you useing?
try adding some expo to the stick, deaden the center most point of the stick and see what that does for you first.
if the radio`s stick isnt bounceing when the servo`s are, i would say the servo`s are weak on the troque side of thing`s.
or you have one going bad causeing the other`s to react to the dieing one`s amp draw.

crash`s come easy patience`s doesnt
11-08-2009 11:30 PM
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helinut4ever
Senior Heliman
Location: Knoxville, Tennessee-Knox

My Posts This: Topic  Forum		I'm using the 8717's on 6v and they only had about 12 flights on them when I got the heli. I added about 40% expo and that seemed to soften it up a bit. Should I try adding more? Do you think that a flimsy flybar could cause this?
11-08-2009 11:42 PM
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fast400
Senior Heliman
Location: shelby twp. michigan

My Posts This: Topic  Forum		not sure, i never had a flimbsy flybar.
not sure the flybar would make the servo`s quiver.

crash`s come easy patience`s doesnt
11-08-2009 11:56 PM
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helinut4ever
Senior Heliman
Location: Knoxville, Tennessee-Knox

My Posts This: Topic  Forum		I changed the paddles on this 600E and they stick out further on the flybar, seems to make the flybar really flimsy. Just tapping it with your finger will cause a springy like reaction. And I'm not really saying the servos are quivering but thats what the heli acts like is causing it to wobble for a couple of seconds. Thinking maybe that spingy action in that flybar could cause the wobble?
11-09-2009 12:06 AM
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Band1086
Senior Heliman
Location: Kennewick, Wa. USA

My Posts This: Topic  Forum		I don't think it's the flybar. I have long paddles on my 600E also,
and they have that same springy feel to them when you tap them, but that heli is as solid as a rock. How's the head dampening on yours?
I put special 3D dampeners in mine, but I'm running 2350 HS with 12S.
11-09-2009 04:53 PM
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helinut4ever
Senior Heliman
Location: Knoxville, Tennessee-Knox

My Posts This: Topic  Forum		I would assume that it has stock dampers although the heli it's self was set up for 3D. It has the 8717's on cyclic, 8900 on tail, with a Neu motor that really makes the CY stick bangers talk. I don't know the head speed but this thing is humming!! How could I tell if it's the stick bouncing when I let go and it centers it's self? I guess it very well could be the stock dampers given the head speed this thing has, how can I calculate it?
11-09-2009 05:31 PM
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BarracudaHockey
rrMaster
Location: Orange Park FL

My Posts This: Topic  Forum		The 770 should start at 50 percent expo.


AMA 77227
http://www.jaxrc.com
11-09-2009 06:14 PM
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Band1086
Senior Heliman
Location: Kennewick, Wa. USA

My Posts This: Topic  Forum		What batts are you running (brand, cell count, and mah rating?
What's the KV of your motor?
# teeth on pinion?
What ESC?

By the way Model Avionics makes a "Sky Tach" which is very cool and a very useful tool when setting up gov's on N's and ESC's and gear ratio's on E's. But we can calculate it.
11-09-2009 06:33 PM
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helinut4ever
Senior Heliman
Location: Knoxville, Tennessee-Knox

My Posts This: Topic  Forum		Battery--ThunderPower 6S 25C 5000Mah
ESC--CC85
Motor--Neu 1515/2.5D/F
pinion--10 Tooth

I don't know the KV rating on the motor, does anyone?
11-09-2009 09:27 PM
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Band1086
Senior Heliman
Location: Kennewick, Wa. USA

My Posts This: Topic  Forum		That motor, if it is a "D" is 1650KV rated, which is way too high for that application.

22.2*1650=36630/10(gear ratio)= 3663 HS

Now, I don't for a minute think your turning that fast but it's not a good combination never the less.
11-09-2009 09:44 PM
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helinut4ever
Senior Heliman
Location: Knoxville, Tennessee-Knox

My Posts This: Topic  Forum		It doesn't say "D", just "F". I haven't had the long, only a couple of weeks. I really haven't even finished setting up my TX yet with the heli. I've just been trying to get the bugs out it so I can do some forwaed flight with it. I've just been moving it around in the back yard at about 15 to 20 ft in the air doing slow figure 8's and I'm flying for 6.5 mins (not even in idle up but with 100% at 1/4 stick) and I'm putting back about 2400Mah's into the battery!
11-09-2009 10:13 PM
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Radio - Servo - Gyro - Gov - Batt > 770-3D Question
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