Industrial Turbine

[HFG]

Is that tie wrap the only thing holding the tank on ?? :)

[cbergen]

Temporarily.....:)

[eric_b]

Lookin good, Chris! Bergen birds are smooth flying machines, and capable. Mine has no problem at a gross weight of 36#, at 10,000' density altitude. I'm sure the new owners will be proud!

[cbergen]

OK, quick update.

We have been working incessantly on this thing as the customer is coming to get it on Sunday. I have pics, will post them later, BUT,

We just completed the first time trial.

Full of fuel, the heli weighs in at 23Lbs. The camera mount all by itself weighs 12.5 Lbs.

At 22 minutes, the fuel tanks went dry.

[uh1b1]

heres some pics

[rkeith2]

Look at that bad boy!!!

[LITHIUMSTATIC]

:drool::drool::drool:

[HFG]

Damn thats HUGE ! Iam guessing thats just a test camera.

[cbergen]

Yes it is!! The RED camera that goes with this bird isn't here yet......

:):)

[RMcCord]

Awsome Chris
Can't wait to see mine

[HFG]

How about some vid of that beast flying around !

[cbergen]

I'm troubleshooting an issue with both Turbines, the Industrial and Robert's.

Here's the problem, In HH mode the tail is wagging rythmically. In normal mode it's perfect.

Both heli's have Gy 611 gyros w/9256 servo. Initial gain set up was at 35%, all manner of gain has been tried, higher and lower. A longer servo arm was tried with accompanying travel limits adjustments. No effect. The Gy 611 was forward mounted as seen in the build photos on Zeal Tape.

A Spartan DS760 gyro was installed, using the same servo, 9256, after setting the proper servo signal. NO difference. A JR 8900 servo was installed, and again adjusting the signal for that servo. No difference. The Spartan gyro was mounted on the tail boom, with Zeal Tape.

The transmitter on the Industrial is a Futaba 12FG, I have a 2 position switch (F) set to turn HH on and off, NOT using the Gyro sense page, instead just adjusting the Travel values to affect gain changes. Either way the screen on the 611 states the current Gain setting.

On Robert's, the radio is a 9303 2.4, again with the gyro on the gear channel, showing 35% on the 611 amp.

Mechanically, I've changed the complete tail unit, gearbox, slider, hub, blade grips, blades. Assy was checked and all is as it should be as far as thrust bearings, spacers, etc.

A new main gear, autohub, and mainshaft were installed, meshes were checked, All with no difference in the tail wag in HH mode.

Both Heli's are tremendously smooth, no high freq's, no low freq's. Today was fairly calm as far as winds, the past few days have been very windy, no difference either way...

It does better at higher headspeeds(1450-1500), but is still present. Tail blades are 130mm long.

In the morning I'll be changing the Turbine Gearbox, if for some reason, it's surging or pulsing. The Turbine itself sounds consistant in RPM, no surging that can be heard, and certainly not in the same frequency as the tail wag. And still, it doesn't do it in normal or rate mode.

I'm stumped on this one......

[lperagallo]

Looks good:thumbup:

[rkeith2]

Chris,

That is indeed a stumper as you have already done all and more than I would have to isolate the problem. It does not sound like its "hunting" as you explained it as rythmically moving back and forth.

I had my turbine doing this - more like hunting - and found a more tight than desired control pitch links in the tail blade holders.

Once I got the tail where it was easy to move either blade by hand; as easy as the movement by manually turning the servo horn the problem disappeared.

I am now running 611 / 9256 @ 32%

Ron

[HFG]

Have you used zeal tape in the past ?

[cbergen]

Always...:)

[rkeith2]

I think that I am as anxious as you to hear what the final fix is.

[cbergen]

First video is posted,

http://bergenrc.com/uploads/Arnaud%20Ind%20Tur%20Test%20flights.wmv

[cbergen]

2nd video up, WITH RED Camera!!

http://bergenrc.com/uploads/Industrial%20Turbine%20with%20RED%20Camera.wmv

[ErichF]

Lookin good Chris...

What is making the tail kick on the spool up? I thought that only happened on gassers?

That's a helluva coning angle you got going there :)

Oh. and nice landing :thumbup:

[cbergen]

Unsure at this point. We are continuing testing with another heli displaying the same problem. Both are 611's with 9256 servos.

The coning angle isn't really that bad, the headpseed is appx 1400 with MAH 850 Blades.

It was windy (gusting) all damn week while the customer was here, making smooth flying difficult at best. With all that weight, the machine is very stable, but wanted to balloon somewhat with the gusts....One of them caught me on landing..:(

[ErichF]

Unsure at this point. We are continuing testing with another heli displaying the same problem. Both are 611's with 9256 servos.

Maybe ditch the 9256 and get a BLS251. It's gotten rid of the kicks on some guys' FAI birds when at high gains settings.

[phoneman]

That's pretty sweet but I like that that statement better-- " If this goes south "--I could have used that earlier today.

[cbergen]

I was hoping you couldn't hear that....:)

That actually was the first time the heli flew with the mount attached, sometimes you never really know how it's going to work. I always leave myself an out, a direction that I will attempt to go in the event of a problem. And of course keep everyone around you informed of that.

I'm going to try a known good 401 w/9254 just to verify that it isn't something in the heli, although I have already changed everything possible.....

[phoneman]

I understand the feeling completely--the combination of a large heli ( an expensive turbine one at that ) and a rather tall and narrow camera mount looks like it would bring on the pucker factor--especially on landing. It seems like it might want to tip over being so narrow on the bottom.