butters149

I need a better gyro I think because everytime i would climb the tail would swing right, i have a e-flite g90, i was wondering if this combo is good? im only a begginer right now.

http://www.helidirect.com/product_in...oducts_id=4545

would it work with my spektrum dx7?

VinceHerman

While I do personally prefer the Futaba GY401, I have heard good things about the Logictech 2100t gyro.

However, I suspect that your problem is not a poorly behaving gyro. In a large collective maneuver like a hard climbout, you are creating large amounts of torque, and potentially bogging down the motor. With the sudden increase in torque demanding huge tail thrust, and the possible reduction in head speed lowering the tail's ability to create thrust, the tail is simply over tasked. It cannot create enough thrust, even at full deflection, to counter the torque created by the main rotor.
The best gyro in the world will not help this situation.
The common fix (barring any mechanical problems in the tail belt or linkage) is to change your throttle and pitch curves. Raise your throttle curve some, and lower your pitch curve some. That way you will hovering at a higher head speed with less pitch. Less pitch means that there is less torque for the tail to overcome. More head speed means that the tail has more RPM available to generate thrust.

butters149

i BARLY had the LHS get this thing together, brand new 1 day use. he says the gyro isnt really holding, i think the pitch is -1 to +11 last time i checked, i have no idea what the optimal setup is.

maxxteezyyy

get the 2100, got it on my trex and I can hover both hands off the sticks

butters149

doh! i just bought a used 401 with the 9650 servo for $150 shipped, i also got 3 JR DS285 for $50 shipped. is that a good deal? Also how do i increase my head speed? i see it is at 100 percent on the THR curve.

rstroup

+11 pitch is aggressive. If you are new to flying to can reduce this to +8 or +9, no problem.

VinceHerman

The GY401 is a wonderful gyro. The digital 9650 provides very fast response. That is pretty much the perfect tail control setup.
I still think that you need to drop the pitch curve a little bit. You can try that out before the new gyro shows up. That way you are working with fewer variables at a time, and will know which change it was that corrected the behavior.

MiniCwik

I have the logitech 2100t, with a 9650 on the tail and love it!

Fortunately I do not get any wag when bumping up the throttle, and agree that your throttle and pitch curves may need to be adjusted/better matched.

For example, my curves are;

low middle high
Th 0 --- 45 --- 65 --- 85 --- 100
Pi 45 --- 58 --- 70 --- 85 --- 95

I have -4 pitch at low stick, 2 at mid-stick, and 10 at high stick. As you can see I have a 5 point curve in my Futaba 6exh, not sure which transmitter you have and if you have not already check out Finless' videos over on Helifreak.com (great educational resource to learn all about helis and setting them up). You could go into your radio settings for normal Throttle and see what your settings are and bump them upward to get more headspeed. Go into the normal Pitch menu and see what your settings are at, lowering the last point will reduce pitch.

Let us know.

butters149

ok ill post up my settigns when i get back from school today, i have a spektrum dx7 with ar6200. i kinda want more headspeed just for the stability, how do i increase it? Do i change the pinion gear to 13T? change the esc to high timing? i dont even knwo what that does and governer.

MiniCwik

You can increase the headspeed by increasing your throttle curve points, below is a 5 point throttle curve;

Point 1 should be 0 - that is low stick
Point 2 should be around 40-60 (half-way between bottom stick and mid-stick (1/4 stick), your preference)
Point 3 should be around 65-75 (mid stick, your preference)
Point 4 should be around 80-90 (half-way between mid-stick and full-stick (3/4 stick), your preference)
Point 5 should be around 95-100 (full-stick)

Here is a visual from Notepad (attached below) (can you visualize the curve now?)

You can reduce or increase any of these points in your curve to your liking, increasing them increases motor speed which increases head speed.

If you have a 3 point curve, something like this;

Point 1 = 0
Point 2 = 70'ish
Point 3 = 95'ish

butters149

ok ill have to check all thsoe out and the setup videos on helifreak too. another question, how do i tell if my motor is bogging? any videos?

rstroup

You can here the revolution drop. The power and lift will be less.

butters149

Ok here is my setup, the LHS did it for me when we assembled the heli.

Normal Throttle Curve
0-43-80.5-94.5-100

Normal Pitch Curve
2-INH-27.5-INH-67

Swash Mix
75% all

Pitch
-3 to +12 or 13

butters149

oh yea this is with the throttle hold button active on the dx7, i dont know if that will change the pitch or not.

butters149

almost forgot but im using the 12T and carbon fiber blades that came with it.

MiniCwik

butters, I would say you have enough headspeed and it appears that your pitch is not bad either.

The throttle hold would not affect your pitch, it simply keeps the motor from engaging if setup to do that (kind of a safety switch) or in gas heli's it is used to maintain a certain motor amount to run the heli out of fuel.

tippy

Actually, throttle hold should have it's own pitch curve and if it's pitch curve is different than the one you are switching from (ex: switching form Normal to throttle hold) ... then it WILL affect your pitch from one flight mode to the next.

condair

I am building the 450 and picked up a 401 yesterday. I asked about mounting it and i was told NOT to put it on the bottom shelf becuase the motor would cause interference. he suggested i put it behind the motor on the rear of the heli. this isnt that much further from the motor. the problem is the assembly manual says the front is fine.

I really only want to mount it once so please chime in with advice.

thanks all

BryFlyGuy67

If you have the 450 V2, then yes, definitely mount it to the bottom! If you have another kit, please tell us which. It is always preferrable to put an expensive gyro out of the way of moving rotor blades!

BryFlyGuy67

BTW, your post itle says "LogicTech" but the "401" that you mention in your POST is made by Futaba. Which one do you have?

butters149

i have the 401 now becasue i got a good deal on it, also have the 9650 and the JR ds 285s

BryFlyGuy67

What type of Heli?

butters149

trex 450s cf

condair

Sorry folks. I guess i sort of hijacked the thread. Sorry thread starter.

I have the 450 sa ARF kit. i just moved to it from the Blade 400. here is my list

JR 285 servos
Futaba 95?? rudder servo. I forget the number right now but its the right one
GY401 gyro
spektrun 6100 RX DSM2
Spektrum DX6i from the blade.

Thanks all