VStabi on Trex450

[fireup]

Just received my Vstabi. I planned on using it on the Trex500 when it comes out but since that's not here yet, I decided to install it on a 450 for the time being. Got only about three flights on it. Flies great but still need to learn how to tune it as it feels too squishy.

The head is off a Kakama mini titan. I had to open up the blade grip holder so it can fit Align blades. The swashplate driver is made from a JR servo arm.

http://www.helifreak.com/attachment.php?attachmentid=32023&d=1196583320

http://www.helifreak.com/attachment.php?attachmentid=32024&d=1196583320

http://www.helifreak.com/attachment.php?attachmentid=32025&d=1196583320

[EJS]

Nice setup. Great photos as well
Thanks

[Matt]

That must be the most expensive 450 in the world ?

[rcboosted]

Wow, very cool. Are you flying it this coming weekend? I'd love to check it out in person. How much does a vstabi system cost? Compared to the 2 gyro csm system you had?

[fireup]

This is the second generation VStabi system that does not have or need an airspeed sensor and will also work with nitro. It was $699. It has 3 gyro sensor, so would cost less than if you were going with 3 CSM gyro and a Cylock. I should be flying some more this weekend. I'm still trying to learn how to tune it so it's not so bouncy.

[brovic777]

Very nice Kevin. u da man with this kind of stuff!!!

[jyheli]

fireup,

Good Luck to your project, I hope you get it to work.
I tried the achived the same objective, but have since give up. I was using HS65 servos which is a problem. Ulrich the designer of VSTABI was helping me and here is his comment about the possible problem I faced.
Hopefully these information is useful to you. I will be checking in on progress of your effort.

Now I move to get one step up customising an Logo 500 to an Logo 400 spinning 430 size blade, and of course flybarless.


http://www.vstabi.de/forum1/read.php?9,3471

"Well, i understand that you gave up, but the reasons ar not the Blades IMHO, at least not directly. The Problem in most cases is a mechanical setup, which here is not what you need for a good working system.

You need (in the order of importance):
- good geometry for correct travels.
- minimum play
- digital servos
- fast servos
- precise servos

I dont know how prebar works, so i can only speak for VBar. And here we need light Blades! If you put on weight, everything gets worse. That is our experience.

Light Blades in such a setup react extremley fast on pitch changes, so that you need an fast control loop. Play is a no no for fast and precise reactions, same with flex in the chassis or the rods.

I think your installation shows, that the used Heli is not fitting a conversion very well, there will be needed mayor changes to make it better. "

[fireup]

Thanks jyheli for the info. What problems were you having with your 450 before you gave up on it?

I'm still getting a slow oscillation in the elevator on mine and still figuring what to change to get it snappier.

[th3tick]

Thanks jyheli for the info. What problems were you having with your 450 before you gave up on it?

I'm still getting a slow oscillation in the elevator on mine and still figuring what to change to get it snappier.

I don't suppose you have the, um, Anti-Oscillation Filter in use?

http://vstabi.de/wiki/index.php?title=AOF_Anti_Oszillation_Filter

It sounds just like what this is intended to fix.

John

[Hulley]

subscribing!!!!!! Way cool!!!

[jyheli]

Kevin,
I have to admit that your washout is done very well, mine is not that good and it must have contribute to the challenge that I faced. But in general I find that it is very twitchy and hovering around for 30sec is ok but once I start to ff or puch up it become very unstable.

Jonathan

[Caleb Phillips]

This is the second generation VStabi system that does not have or need an airspeed sensor and will also work with nitro. It was $699. It has 3 gyro sensor, so would cost less than if you were going with 3 CSM gyro and a Cylock. I should be flying some more this weekend. I'm still trying to learn how to tune it so it's not so bouncy.

Out of curiosity, do you have two tail gyros on the heli? I'm not familiar with the V-bar but I thought the tail gyro was encased in the main unit but it looks like you have a gyro mounted under the boom clamp...:confused:

Also, where about did you find the V-bar unit at this price? :YeaBaby:

[uragano47812]

The v-stabi has two unit. The one similar to a gyro is in reality a gyro with 3 axis so alieron elevator and tail. The other unit is the electronic control board where you connect rx and usb for pc software.

[Ticidytoc]

Also, where about did you find the V-bar unit at this price?

Try Esprit Model.

[LITHIUMSTATIC]

Very cool... :thumbup:

[Caleb Phillips]

Thanks guys. I was thinking about trying a v-bar setup on my Stratus but it's kind of a big jump in terms of $$$.

So, how about a video of this 450? ;)

[fireup]

Also, where about did you find the V-bar unit at this price? :YeaBaby:

Esprit Model didn't have in-stock so I got mine from rcflightstore.com in Canada.


So, how about a video of this 450? ;)

Since I just got my 500, I have move the system to that heli. I never got it working as good as I would like before I removed it. I fix the play in my swash and that seem to eliminate the slow oscillation I was getting. But because I'm using 65mg's and they are not digital so I don't think the servos are fast enough to keep up.

[LITHIUMSTATIC]

Has your flight time increased? How much?

[Deron Douglas]

Can you use the VStabi on a 4 blade head? Does it require separate gyros like the helitronics mixer?

[uragano47812]

But because I'm using 65mg's and they are not digital so I don't think the servos are fast enough to keep up.

For experience with Hitec HS-56 they aren't so much precise in centering. For example the DS285 are real good ones very precise and sppedy at 6V, but you will apreciate their precision.

I think for v-stabi the precision is very important too.

[fireup]

Has your flight time increased? How much?
I did not had a chance to test this, but I plan on doing a direct comparison on the 500.

Can you use the VStabi on a 4 blade head? Does it require separate gyros like the helitronics mixer?

The VStabi is an all-in-one system (2 unit). It has a CCPM mixer and 3 gyro sensors in a single unit (2 for cyclic and one for the tail). It can work with any multi-blade heli as you can change the phasing angle of the swash. I also have CSM flybarless system, and the VStabi is far more easier to tune. Also because there's only one Aux channel for flight mode setting, you can run it off a 6 ch. reciever, where the CSM requires 7 or 8 ch. Over all weight and wire clutter is also down.

http://www.helifreak.com/attachment.php?attachmentid=32026&d=1196583320

[LITHIUMSTATIC]

:drool::drool::drool::drool::drool::drool::drool:

[Ticidytoc]

:lolol

[THX1138]

Ok, so where is the video man?!

Lou

[matthew2456]

Hows this going?

Thinking about trying a sk360 with a kasama head!