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George Miller needs some help


Old 09-27-2018, 12:25 PM
George Miller
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Default George Miller needs some help

Hello fellow modelers.

I have a real problem I can't figure out and I am hoping some of you out there can give me some help and advise.

I was flying one of my favorite sport aircraft the other day. It is called "Tirawa" and it is designed by me and also scratch built.

Now this is one hell of a sport plane. I have been doing this RC stuff for so long I just can't get interested anymore with the run of the mill models that one usually flies.

As you can see by the pictures, it is pretty exotic. The fuselage is fiberglass off a plug I built. The wings are built up out of balsa and ply.

I uses a "Rimfire 32", "Castle" 90 amp ESC, "Castle" BEC, 6000mah 4 cell, "Spring Air" retracts, "Hitec" servos and a Spektrum DX8 radio.

All control surfaces are totally sealed to the flying surfaces with no gap between them by custom hinging. All gear doors function and seal up the landing gear holes.

Flight surfaces are sheeted, glassed and the aircraft is painted with "PPG" automotive paint.

Now this aircraft is over TEN years old. I would guess I have somewhere in the neighborhood of 50 flights on it.

And this is one hell of a flying aircraft. Capable of doing any maneuver you want to do with it. Due to it's design and how sleek it is, it is not effected by wind much. The take offs and landings are a thing to see. Amazing and smooth.

OK here is the rub and what I am totally at a loss to figure out:

I am at the flying field a couple weeks ago. I install a new "HRB", 6000mah, 4 cell battery in the aircraft and make a flight. The flight is just like all the others have been. Beautiful !!

About twenty minutes later I am going to make another flight and install another new battery. Check all control movements and even cycle the retracts.

It taxi's fine and runs down the runway and rotates.

From there it goes crazy. It is all over the sky. It is responding to input but not correctly. It is so bad that before I know it, it is in the ground and it is not pretty.

What in the hell went wrong? Why did it do this? Nothing has changed from the first flight which was so nice.

I was unable to retrieve the Lipo from the crash site. Looked all over but never found it in this thick soy been field. The receiver and radio is still functioning.

So here I am trying to figure out what happened. I never had any control over it .

I am thinking radio problems. I am thinking transmitter failure.

I call Spektrum, then do a repair request form and send the transmitter and receiver to them.

They find nothing wrong with the radio gear.

That is really disappointing to me. I can't find any thing to blame this crazy flight on. I have no clue what happened. I can't even blame it on pilot error.

Any advise or suggestions from you modelers would be greatly appreciated. Have any of you ever experienced anything like this?

BTW: Nice thing about making your fuselage out of fiberglass. I have the plug laying around the shop and both wings and the tail section survived the crash. So I am building another.

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Old 10-10-2018, 08:42 PM
Cessna dude
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Nice bird! Im a newbie, I have a buddy warn me about spectrum radios, he said he had an issue with his and it tore up a good bird also? Since he said that the bird im building may not get a spectrum install but perhaps another brand. I cant take chances with inferior products, this hobby like others is expensive, and im trying to stretch a dollar....
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