EXI 450 V2

[nunyabizniss34]

And again...pretty basic for now, I am gonna paint the canopy to say "SEXI B!TCH" (get it? S-EXI???) ;D

Colin

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[BTCat]

Sept 2, 2009 16:57:17 GMT -6 nunyabizniss34 said:

And again...pretty basic for now, I am gonna paint the canopy to say "SEXI B!TCH" (get it? S-EXI???) ;D

Colin

Good idea. Never thought about that. I had almost as much fun painting and decaling my canopies as I did with the build.

BTW, are you using heading hold on the gyro? That will make all the difference in the world. I think I had my original gyro set at about 12 to 18 % gain in HH. Not sure what it would be with yours. Another thing I found out on my original was that I had to power up the heli in HH or it didn't seem to work properly. Pesky to figure out all the quirks, but all kinds of fun to fly.

I noticed the sticker is still on the motor. Peel a little off and spin it up. I dare you ;D ;D

[nunyabizniss34]

Sh!t, I forgot about the sticker Oh well, it'll be fun when it scares the crap outta me ;D I don't think the gyro is in HH because the gain on my tx makes no difference no matter where I set it. I think there is a setting in the setup software that I need to adjust but haven't quite had the time this evening to do it. Like I said earlier it's the same tx as the Exceed 2.4ghz so you can assign the dials to pitch or nothing. Now that I think about it, I didn't see a setting for the gyro gain assignment in the software....hmmmm. Maybe that's my problem. Another problem I am having is with the software...every time I connect my tx to my laptop, it boots me off the internet and I have to re-install the driver for the software every time I use it

Colin

[Solitaire]

You can tell if it's in rate or HH mode by giving it full left or right rudder and watching what the servo does when you center the stick. In rate mode the servo will recenter, in HH mode the servo will tend to stay in whichever direction you pushed the stick.

I know squat about TowerPro servos, but if the SG90 is an analog servo the Telebee switch has to be on "std".

[nunyabizniss34]

That tail just wants to keep spinning, I can't hold it straight no matter what I do. When holding left or right rudder and then centering the stick again, the tail servo returns to center regardless of the gain position on the TX. Ran through 4 batteries making adjustments! I am convinced there is something wrong with my tx, the gyro gain is doing SQUAT. I really need to get the Spektrum but don't have the funds for it right now. Testing will resume tomorrow.......

Colin

[Solitaire]

Try removing the single connector on ch5 on the Rx. Then try setting the gain on the Telebee. See if that steadies up the tail at all.

[19000rpm]

Sounds like you just transferred the problems from the BH over to the EXI. You might be right about it being the Tx because if it's working right the left dial, B, has a huge effect on gyro gain on the telebee.

I have noticed it is sensitive to boom position of the servo and Tx trim. Also as previously mentioned the gyro needs to be on analog.

Mine has a miniscule twitch in dual rate and no matter how finely I tune it, it needs to be adjusted on every flight to get it solid. This I think is not a Tx issue, but a gyro issue.

If you're going to spend for a DX6i let me know I have a line on a used one if it hasn't sold yet.

You may as well upgrade the gyro too to an Align or like type.

Happy landings

[Tony]

Hello Colin,

It sounds like you are having the same problem that I had on the first CP heli that I built/setup. Next time you spin up the heli pay close attention to the tail slider. If it is sliding all the way over against the boom then the gyro is doing all it can do. I went round and round with this problem and nearly pulled all my hair out. I fiddled with the gyro and tail servo for days until I finally took the gyro completely out of the loop and plugged the servo directly into the Rx. I still had the same problem. The heli would start to spin up and just about the point of lift of it would start a counterclockwise spin and nothing I did would stop it. At this point I knew the problem could not be the gyro settings. What I finally found to fix the problem was to bump up the throttle curve to get the head speed up before the point of lift off. If your head speed is too low then the tail rotor doesn't have enough thrust to counter act the torque of the main rotor.

I have never used or even seen the tx that you have so I can't tell you how to change the throttle curve but I am sure there is a way.

Just a suggestion,

Tony

[19000rpm]

Dave had a similar issue and we thought maybe the throttle/pitch curve was too high as Tony pointed out. Haven't heard whether Dave figured it out yet. One thing for sure; too much main blade torque from too high initial pitch will overcome the tail regardless of where the slider is.

The throttle pitch should be the dial on the right. Try dialing it left a bit.

Happy landings

[nunyabizniss34]

I have the throttle pitch dialed in at around the 10 o'clock position right now, she lifts off at just under half stick. I can hold her in the air but it's just like the gyro is having no effect at all, the tail is all over the place. I have a 6 channel Esky tx/rx (same one from the Belt CP V2) that I am going to put on the EXI this weekend just to see if the tx I am currently using is indeed the problem. I suspect that it is. But it could very well be something else. I am also having problems with the programming software for the tx that I am currently using as previously mentioned, which also is not helping me at all. I am not sure if it's a headspeed issue, seems to have way more than my Blackhawk ever did! I will check the throttle curve settings on the tx this weekend also and let you know what the settings are. I was going to ask what you recommend what the curve should be. This is all part of the learning curve, thanks for all your advice guys

Colin

[Tony]

If you are lifting off at less than half throttle then you probably do have too much collective pitch at that low of a throttle position. At mid stick you should, at the most, be light on the skids. I would try lowering the pitch curve or raising the throttle curve.

A good starting point for your pitch curve for normal mode is:

Stick position_____Low________Mid_________High
Pitch angle _______-1___-.5____0 _____5 ____10

[nunyabizniss34]

Thanks Tony, as soon as I can get the software working I will check and make the necessary adjustment. I think the DX6i is on the horizon...I hate fighting with computer software!

Colin

[akent]

What Tony said!

As Tony said, in a different way, if your headspeed (rotor rpm) is really low, then the tail is not spinning fast enough to be consistent and authoritative.

Also, you might be having some trouble if you are running a Towerpro SG90 servo on the tail. Those are generally considered way too slow to control the tail. I really don't know how tails react with a slow tail servo, though.

Dx6i = good!

Best,
Kent

[nunyabizniss34]

Success!!!! It WAS the TX!!! I knew it! I took the rx off my HBK3 and switched it with the one I was using. This thing flies AWESOME now, and the nose is held dead straight with the Telebee. The tail servo now twitches when I move the tail by hand, and that is what I was looking for. I am in love with this bird ;D Now I know what you all were talking about, smoother than silk! Video should be uploaded later, I am off to get some decals for the canopy now. Can you tell how thrilled I am?? My first build was a success, even though using the Esky tx/rx is a little tricky to set up properly because the tx is not programmable but it's as close to spot on as I can get it, minimal trim required. I do have a DX6i on the way though Thanks to everyone for the advice and encouragement! You all rock! ;D

Colin

[nunyabizniss34]

Here is the (finished?) product, not sure if I like the way I painted the canopy but time will tell. ;D