EXI 450/BLUE RAY 450 DEDICATED THREAD

[Dave]

This thread is dedicated to the EXI 450/Blue Ray 450.
Please stay on topic when in this thread.


Dave

[Dave]

Well I guess somebody has to be first so here we go.
As you all know I just got the BR last week and as of today have not been able to get her in the air due to a couple of things, one being time and the other a bad spinning tail. Yes you heard me right the tail has the blessed spinning crud but I will get this figured out as time allows.

My question here is on the gyro. I believe the V2 model has even a newer model on it now. It is the 62P12 aka 18H-EE0083. Does anyone else have it and if so can you tell me if it needs to be initialized in the rate or hh mode.


Dave

[Vigilnte]

I have mine set up in HH mode. I've heard many opinions on having it set up in rate mode vs' HH.

About your spinning, my Blueray out of the box spun. This ended up being the servo sliding down on the tail boom.
I've since switch to a EXI boom which is slightly thicker diameter and the tail server mounts hold better. I use plastic mounts. I hear the metal mounts hold better.

Thanks
Q

[jdino2]

Dave;

I won't be much help here much since my BR came with the older Exceed 6P12....only one trim screw...........

I can say like Vigilnte.....there are a ton of opions on this......dditch is probrably the most knowledgable...........

Like Vig....any problem I had with the older version was taken care of by manual adjustments made to servos, linkages, tail gear assembly and linkage bar straps......I have yet needed to electronicaly re-bind or PC tune the TX to get the gyro to function properly...maybe I'm one of the lucky ones...........

Thanks for the dedicated site.......this will save time!

Jdino2

[alemao]

Dave, mine was the same as yours I think, The light does not change color and has two trim screws, one is Gain and the other is for Reversing the gyro instead of flipping it. as far as i know, it must be initialized in HH mode.

I had to make adjustments in the tail servo position in rate mode until I got the tail stopped, then I went into HH and used the gain knob at 10 - 11 o'clock position. the tail never stood still, it would drift a little bit differently every time it flew.

I changed the servo for a s9257 and got 100% better. Then I put a ds760 gyro and I got to know what rock solid means.

[flyinghigh]

Dave, I think you will find this helpful, used it to help set up my stock BR gyro (before I changed to the HS5000)

www.mycoolheli.com/files/MKS292ManualRewritten.pdf

you must initialize in HH, red light on in HH, no light in Rate, since you use the TX to adjust gain, the gain on the gyro is used to set your servo limits, the other to reverse the gyro -

I moved mine here, I did not like it dangling from the tail boom on its side -



when I moved it from there, I had to reverse the gyro, since from factory is mounted upside down -

[Gabe]

Gyro's should always be in line with the boom. Preferably right on top or right underneath. Something to do with the gyroscopic procession. It works the best there. Otherwise you may experience unwanted wag and tail wandering.

[Dave]

flyinghigh you may be the hero on this one.
To reverse it is this done on the gyro with the unmarked screw, the other one is marked "Gain" or is it done through the tx.

Dave

[flyinghigh]

Dave - yes, adjust gain from TX, use gain on gyro to set servo limits -

Gabe, you are probably right, but I was not real thrilled with the stock gyro (its ok) and it has to be mounted on its side, and the only way to do that on the boom is the bottom of the boom block, no place on top of it, unless you make a 'platform' for it to sit on. It literarily just dangled from the bottom of the boom block, it could 'wiggle' all over the place, which is why I guess they now have velcro around it.

When I moved mine, I had a much more solid tail, of course, that could be because I set it up 'better' the second time (ie positioning servo on the boom etc)

Long story short, worked fine for me, and I got the idea from the instruction manual for the gyro.

that said, I now have the HiTec HS 5000 mounted on top of the boom block

[dditch66]

Yup, that's the MKS292 alright.
Follow that manual I rewrote.
I have it in my Scale Blueray that has a Heliartist Fuse in it.

I mounted mine on the side so I could see the light through the window.
Gabe, "gyroscopic precession" is more of an active force reation and not having to do with the RC heli gyro. GP has to do with how the blades are 90 degrees out of phase with the cyclic swash. Anyway. You don't have to have it inline with the boom for it to sense rotation. It's actually sensing rotation by the way through differential movement of 2 piezo chrystals. It does not have to be at the center of rotation either since no matter where you put it, if you rotate the heli 90 degrees, the gyro has moved 90 degrees. Just make sure you properly foam isolate it.

If the gyro is reverse setting is incorrect, it will spin violently one way, then you move the stick the other way and it will spin violently the other way.
Dave, will it hover in HH mode at all?
Try the pinch test first.
www.mycoolheli.com/gyrobenchtest.html
There are other things you can do to the servo to make it work better but lets start with getting it to even hover.

[Dave]

Well last night I took everyones advise.....pinch test, reversed gyro, adjust servo position and waited for this morning to come to work with heli in tow.

Yea haw ;D ;D ::)the heli can hover. Guys you are my heros. Went through a complete battery before 7:15 am inside the warehouse. One thing I did discover.....this gyro sucks as far as holding a heading. I guess Santa knows what to put under the tree for me now ;D

Dave
(Next) ;D

[flyinghigh]

Goos stuff Dave I agree about the gyro, that and the tail servo is all Ive replaced tho, rest is stock -

[Gabe]

Ah, I learned something new today

[dditch66]

Dave,
Did you slowly turn up the gyro gain (in heading hold) until it started to wag, then turn it back down some?

There are definitly better and more forgiving gyros out there but I still have an MKS292 in my scale heli and it holds reasonably well.

[Dave]

Dec 7, 2009 12:24:46 GMT -6 dditch66 said:

Dave,
Did you slowly turn up the gyro gain (in heading hold) until it started to wag, then turn it back down some?

There are definitly better and more forgiving gyros out there but I still have an MKS292 in my scale heli and it holds reasonably well.

Yep sure did dditich66, until about the ten o'clock position and then started to turn back down just a tad. One thing I have noticed and have not figured out yet is that about every ten seconds or so the tail gives a little twitch, stops and then ten seconds or so does it again. Even with the tuning the tail still wants to drift off center. Gives the left thumb a good working while hovering...lol. Got to work on the servo setting next and see if this will make any difference.

Dave