Re: Odd crash, any ideas what happened?

There isn't enough left to justify any repairs. I'll just ditch the 27MHz and go to 72MHz - until I maybe some day can afford spread spectrum.

Jen

Helge Opgård wrote:
The good news then is that you can repair your RX, it is most likely the FET or a diode (or both) that are busted. Both can be bought for a couple of dollars each. Perhaps the school lab can do the soldering work for you?

If you skim through the thread I inserted in my previous post you should find info on the components.
You may also want to sign up on www.rcuniverse.com and send a message to the author of that thread, he may be able to help you out.

Helge

"Jennifer Smith" <jennifer@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:BK2dnb7bXf18uQDbnZ2dnUVZ_rK3nZ2d@xxxxxxxxxxxxxx
It appears that you're right. I took the RX to a local schools electronic lab and did some testing with it: The built-in ESC seems to be busted, it runs OK until it heats up, then it fires the motor to full throttle. At the same time, the servos flutter like crazy and effectively provide no control anymore whatsoever.

Oh well. Good thing I still have my other planes... I'm lusting after a DX6, but that'll be a few years before I can afford one.

Jen

Helge Opgård wrote:
Hi Jennifer,
I assume that you have the stock Parkzone Radio and RX that came with the Stryker B?
The RX module is known to break down at least with some of your sympthoms.
There is a component on the RX that is regulating the power to the motor (and perhaps to the servos) that tends to break down, this results in the motor running at full power no matter what you do with your TX, but usually there is still control over the servos.

If you are interested, you can read a lot about Parkzone electronics here:
http://www.rcuniverse.com/forum/m_4094683/anchors_4094683/mpage_1/key_/anchor/tm.htm#4094683

I have had two of those RX'es break down on my F27-B, but managed to keep flying until the battery was drained enough for the motor to stop. I have since switched to the DX6 and now to DX7, would never look back :-)

Helge


"Jennifer Smith" <jennifer@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:TfOdnSH69N5pLArbnZ2dnUVZ_gSdnZ2d@xxxxxxxxxxxxxx
This morning I stuffed my old F27B, and I don't know what happened:

Charged LiPo, topped off TX batteries. At the field, did the usual pre-flight: Servo check, engine check, plugs all checked, linkages checked, fuselage checked. It all checked out, nothing out of the ordinary whatsoever.

Launched, plane climbed to altitude. Brought it around for a big circle when I noticed the first oddity: The plane climbed rather steeply. I cut back power and adjusted the trims, regaining control and deciding to bring it down. Before I even got to lining up for approach the engine revved up, the nose dropped into a straight down dive, from about 50-75 feet up. I cut throttle, flipped from low rates to high rates and tried to pull up - but the engine was still screaming and the control input had no effect whatsoever. The plane went straight into the ground, with engine screaming all the way until impact.

The plane is pretty much a loss. I haven't looked at the mess yet but I'm stunned as to what would cause such behavior? It doesn't feel like radio interference, it just seems like an entirely odd loss of control.

Any ideas?


Jen

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