Tail steady in forward flight...but...

[MartinS819]

OK, I've got my Hurricane dialed in pretty good, she's a great flyer, but when I'm doing any kind of backwards flying the tail always kicks and does a 180.:arggg: I've followed Finless' vids, but whatever I do it's just not holding in backwards flight.

My setup is:
EP 550
Plastic frame
TREX 600 boom and tail system
GY401 gyro
DS821s on cyclic and rudder
RCP 1100kV brushless outrunner
GAUI 50A ESC
RCP 500mm main blades
3A voltage regulator
2 X 3S Lightning Power 2200mAh lipos
I'm running at 2000+ headspeed.

Do I need a better gyro or tail servo? BTW she stops on a dime when I'm doing piros, but just won't hold during backwards flight.

What do you guys think? Anyone else having this problem? Any ideas for a solution?

[worldofmaya]

How much head speed do you use?
-klaus

[vicrc]

The 401 Gyro is plenty good but I personally wouldn't use the 821 for tail, too slow.

Speed:.19 sec/60° @ 4.8v, .15 sec/60° @ 6v

[MartinS819]

Klaus-
I'm running around 2000 rpm maybe a bit higher(tached). It should be close to 2200 but I don't think the GAUI 50A ESC is able to handle the current draw needed for that HS.

VicRC-
Yeah I don't think the servo is fast enough, but it should hold though right? Maybe I need a higher torque servo? I'll see about getting another tail servo.

Thanks guys

[bugdozer]

Torque is not important, speed is. Your tail can bop back and forth faster than a slow servo correct for the movement. The faster the better.

[mjdee14]

Try moving the tail connection out further on the servo wheel...it will make it faster to react.

[MartinS819]

I did, it's out the furthest it can go on the arm. That improved it, but it's just not holding. I think I'll just get a new servo next month. Any suggestions for a high speed/torque servo? Preferably lower cost, say around the $70-$90 range. It should work good with a 401 and also a Spartan, which I plan to put in the Hurricane later on, so my Trex 450 can have it's gyro back, lol.

[Wazzer]

9254 is the best combo for the 401 and will work well with the Spartan as well

Just dont forget the voltage regulator

If the 9254 is a bit pricey there are some interesting Servos available from Hyperion Atlas series the spec suggests they will perform well but i have heard of no actual field reports as yet
If they work well then the prices are very good

Ben

[MartinS819]

Thanks for the info Ben! I'll look into the 9254 for my rudders.

[Wazzer]

Check out this page http://media.hyperion.hk/dn/at-ser/atservo.htm

and download the servo specs its the HP-DS20GMD that sounds most interesting and its about 1/3 the price of a 9254!! it runs of 6v so no need for regulator

specs are
Weight : 49g
Speed 4.8V/6.0V : 0.07 / 0.05 sec - 60 deg
Dynamic Torque 4.8V/6.0V : 1.6kg / 2.0kg
Holding Torque 4.8V/6.0V : 3.2kg / 4.0kg
Dimensions : 40.0 x 19.5 x 37.80mm
Gear Train Primary Material : METAL GEAR
Bearing : Double Ball
Recommended for high performance 30-90 sized helicopters and large aerobatic planes.

Looks pretty good to me i think i will get one to try it out as my tail servo is also Junk

Will probably pick one up from Singapore Skyhobbies in about a weeks time
http://www.skyhobbies.com.sg/servos.htm

I will let you know how it goes when i recieve it

Ben

[MartinS819]

Thanks Ben! I'll check it out!