Wag + Vbar

[jbaum81]

Hey guys, just got a 300x in a trade, but I didn't get the beastx, so I'm just running a spare vbar i have. The cyclic is great the vibes are low but the tail will wag wag wag.

There is a little tiny bit of slop in the tail, and the vbar is setup right. I got an Align 425 servo today and it's no better than the stock servo. I'm thinking just buy the lynx tail, but not sure how precision that thing is and if it's worth the $90.

Any thoughts on the vbar + 300x combo? or the lynx tail??

[Dustin Mustangs]

The lynx tail system is really nice but you shouldn't need it to get rid of a wag, even with all the slop in the stock parts. Given your vbar is properly adjusted, I would suspect either a tail servo on the way out (do not replace with a stock one), mechanical binding in the tail linkage, or your mechanical gain is out of whack.

Good luck and welcome to the club.

[eltreato]

I have a vbar on my 300x and I love it. Instead of the bank settings I had to choose the one that allowed it to use the gain settings on my dx6i. Bonce I did that my wag went away.

[Nelsonisms]

I have a buddy that put one (mini vbar) on a stock 450X and couldn't get the wag dialed out either. He tried a couple different tail servos without much change. We never really got to the bottom of it since he's a new dad and so it's had to take a back seat for now. But one thing I do recall is that he never upgraded it to the pro firmware. In the express version you don't get a whole lot of tuning options for the tail, so I always wondered if it could be made better with the pro firmware. Either that or if any difference would be made using a high speed 760μs tail servo like the DS95i. Anyways, food for thought. I wish I had the magic formula. I love my Mini VBar on my X5 but I've never tried it on a small heli. I am interested in finding the root cause since I would like to replace the BeastX on my 300X eventually.

[jbaum81]

Originally Posted by eltreato

I have a vbar on my 300x and I love it. Instead of the bank settings I had to choose the one that allowed it to use the gain settings on my dx6i. Bonce I did that my wag went away.

I did that already, even used a trim button on my dx9 to fine tune it but no luck. I have to get it super squishy for the wag to 1/2 way go away.

Originally Posted by Nelsonisms

I have a buddy that put one (mini vbar) on a stock 450X and couldn't get the wag dialed out either. He tried a couple different tail servos without much change. We never really got to the bottom of it since he's a new dad and so it's had to take a back seat for now. But one thing I do recall is that he never upgraded it to the pro firmware. In the express version you don't get a whole lot of tuning options for the tail, so I always wondered if it could be made better with the pro firmware. Either that or if any difference would be made using a high speed 760μs tail servo like the DS95i. Anyways, food for thought. I wish I had the magic formula. I love my Mini VBar on my X5 but I've never tried it on a small heli. I am interested in finding the root cause since I would like to replace the BeastX on my 300X eventually.

This one is pro, but I'm not hahaha.



The thing is wag has always been easy for me, just a good servo and make sure mechanics are good are your golden. This one is not so easy the tail isn't terrible, I've had far worse fly far better... Not necessarily this small though..

[para5063]

Which hole on the servo arm are you using?

[Nelsonisms]

Originally Posted by para5063

Which hole on the servo arm are you using?

That's an excellent point, you should definitely experiment with moving the ball around on the tail servo horn. It's really the only variable left.

[jbaum81]

I've tried with different lenghts one at about 74/74 and 110/110 with vbar. both within the good range of the control loop.

I have a feeling I'm just going to have to try out the lynx tail. I hope it's actually quality and precision machined not just some blingtastic "upgrade". I hate to spend $100 on an upgrade on a heli barely worth that in the first place. This little thing is fun though, just annoying tail.

[Dustin Mustangs]

It is only $70, and yes it is really nicely made.

http://www.amain.com/Lynx-Heli-Blade...Silver/p295738

[ahahn]

Since the stock tail setup and stock servo (76T) with the AR7200BX works great--no wag, I can't see any reason to buy a $70 aftermarket tail.

[Nelsonisms]

There are also two positions for the ball on the tail pitch lever itself. That might be worth some experimentation as well.

I have the Lynx tail system on my 450X and a few pieces of it on my 300X and think they're really nice, but I'd be pretty surprised if that fixed the problem in this case.

[jbaum81]

It's absolutely not the servo horns I've got that dialed in perfect. It's either the vbar or the tail. I've seen heard of others running the vbar on these.

[vtown nick]

I see it is in fact running pro on your vbar? If so run the tail optimizer and it should cure it. The tail servo hole needs to be really close to the center of the horn. I don't know the exact measurements just that it is very close or it will wag like crazy and force you to run low gain with vbar.

I setup and cfx with vbar and that optimizer is magic when it comes to tuning! But my lynx build with kst servos and ikon with little tuning has a better tail than the cfx which now also has kst servos.

Quite possible the tighter tolerances in the lynx parts make that much of a difference. Hard to say with it being two different gyros tho for my case.

[jbaum81]

Originally Posted by vtown nick

I see it is in fact running pro on your vbar? If so run the tail optimizer and it should cure it. The tail servo hole needs to be really close to the center of the horn. I don't know the exact measurements just that it is very close or it will wag like crazy and force you to run low gain with vbar.

I setup and cfx with vbar and that optimizer is magic when it comes to tuning! But my lynx build with kst servos and ikon with little tuning has a better tail than the cfx which now also has kst servos.

Quite possible the tighter tolerances in the lynx parts make that much of a difference. Hard to say with it being two different gyros tho for my case.

What are your limits on your tail in your vbar settings? I've gone as low at 74, and high as 110 playing with the length on the horns. I don't know if I'd want to go shorter than 110 as that's already pretty high as it is.

[vtown nick]

Originally Posted by jbaum81

What are your limits on your tail in your vbar settings? I've gone as low at 74, and high as 110 playing with the length on the horns. I don't know if I'd want to go shorter than 110 as that's already pretty high as it is.

I don't remember the exact numbers but it was real close to above or below 100 but not by much