HXT900's for FBL

[youturnjason]

I recently converted my 450 pro clone to FBL, using the DFC head and tarot zyx gyro. But I'm having problems with shakes. On my 250 I had to lower the gains to about 25 to stop shakes which seemed about right for that size, but on my 450 I have to lower the gain to 15 before I can get a shake free lift off. The problem with this is that the heli is quite unstable with such low gains.

I'm wondering could it be the hxt900's aren't up to the task for FBL? Or do I more likely have a vibration/mechanical problem?

[Kozzy_98]

Gday mate!

HXT 900's are ANALOG servos. They work fine on a FlyBarred heli, but not with a FBL heli. They are just not quick and precise enough. You may have to use some align servos but if cost is a serious issue then I believe HK-922's will be enough, but I would do a tad more researching before you take the cheap road!

However my take on a FBL heli is that if you can afford a Good 3Axis Gyro, then good servos are a MUST otherwise you will have little niggles all the time. Do yourself a favour and get some align servos. ZeeJays hobbies are in Queensland and their postage is fast.

Cheers,

Pav

[youturnjason]

Yeh I wasn't sure how well they would work. I only used them as I had some lying around and my zyx was collecting dust so I decided to build a cheapy. I did notice that my feathering shaft is very slightly bent, spool up and flight were still smooth but I'll replace that and see if it lets me up my gains a bit. I'm also wondering would moving the balls in further on the servo arms help with accuracy. I'm currently at 12.5mm but I'm considering 10mm.


I'm planning on eventually getting a super combo I want to keep this heli as cheap as possible. My 250 is my baby this 450 was just cause I had spare electronics lying around and could grab a kit for $50 The new 415m servos have me interested though, cheaper than the 410s and faster.

[cmavr8]

Originally Posted by youturnjason

Yeh I wasn't sure how well they would work. I only used them as I had some lying around and my zyx was collecting dust so I decided to build a cheapy. I did notice that my feathering shaft is very slightly bent, spool up and flight were still smooth but I'll replace that and see if it lets me up my gains a bit. I'm also wondering would moving the balls in further on the servo arms help with accuracy. I'm currently at 12.5mm but I'm considering 10mm.


I'm planning on eventually getting a super combo I want to keep this heli as cheap as possible. My 250 is my baby this 450 was just cause I had spare electronics lying around and could grab a kit for $50 The new 415m servos have me interested though, cheaper than the 410s and faster.

Any luck with making the hxt900s work in an FBL setup?

[pani]

Mine work ok. Balls at 11mm and gains at 40.


[ame]http://www.youtube.com/watch?v=dA-BQkh18VU&list=UUQikodoC3ojsxq69ZmtT55g&index=2&fea ture=plcp[/ame]

[cmavr8]

3D με hxt900??? θεός!
Which one do you use for the tail?

Great, thanks!

[StevenC]

I'm using HXT900 with my SEV2 converted to flybarless stabilized by a ZYX-S. It was shaking initially when I was using the last hole on the servo arms. Changing the Pid gains didn't help. But then I decided to go along with the instructions and reduced the distance of the servo hole. It is now at about 12mm which is the second last hole on the arm.

[distractor]

They are gonna burn up quick smart. Anyone who says otherwise is a fool.
Grab some HS65's if you want a reliable hard working cyclic servo. Cost is not that much. Building a cheapie is fine but they don't end up cheap after a hardware failure causes an accident.

[cmavr8]

"The poor man pays twice", right?

Would love to hear opinions from people running/have run cheap servos + FBL for a long time... if any

Point taken, from both sides. It works, but it may fail quickly.

[pani]

Originally Posted by cmavr8

3D με hxt900??? θεός!
Which one do you use for the tail?

Great, thanks!

Gotek 9257 clone, Zyx-S Tarot FBL 3.5 firmware. Himodel Ice 45A ESC governed at 3200 rpm, Turnigy 2218 motor 15 tooth pinion, Tarot fbl head, Trex 450 SE airframe.

[pani]

Originally Posted by distractor

They are gonna burn up quick smart. Anyone who says otherwise is a fool.
Grab some HS65's if you want a reliable hard working cyclic servo. Cost is not that much. Building a cheapie is fine but they don't end up cheap after a hardware failure causes an accident.

54 flights as to now (i don't fly much). I had a small incident that resulted in landing on the head from an inverted auto that killed all three gears on them at flight 42. I changed the gears on all three of them and fly them still. The HS65 i was using on my beastx V2 450 were burning like crazy. Some say it was the firmware 2.0 using too much current on the servos. I don't care about cost. This is my beater heli, I usually fly my Turbulence D3. I will let you know when they burn up.

[cmavr8]

Originally Posted by pani

Gotek 9257 clone, Zyx-S Tarot FBL 3.5 firmware. Himodel Ice 45A ESC governed at 3200 rpm, Turnigy 2218 motor 15 tooth pinion, Tarot fbl head, Trex 450 SE airframe.

Thanks, nice!

Although my Goteck 9257 just died...

[distractor]

Originally Posted by pani

The HS65 i was using on my beastx V2 450 were burning like crazy. Some say it was the firmware 2.0 using too much current on the servos.

I ran HS65's on V2 firmware for months without any problems. The servo determines how much current to draw from the power source, not the FBL unit. If they were burning up, then the servo frequency was incorrect or there was alot of binding in the head somewhere.

The HXT900's may very well last you quite a while but the 10 bucks you spent on them won't do you any favors when they cause a 40 dollar or more crash.
Take no offense, just my opinion.