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Home✈️Aircraft🚁HelicopterTandem Rotor Craft Chinook - Osprey › Hirobo Chinook TR-SVMIX crash trap.......!
09-04-2006 06:52 PM  14 years ago
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Camel Jokey

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Dubai, United Arab Emirates.

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Hirobo Chinook TR-SVMIX crash trap.......!
***IMPORTANT-IMPORTANT***

I just discovered that if you overdrive the servos with a TRSV-MIX displayed out-put value of more than plus or minus 180 the effected servo will loose the signal & will have no power, thus causing a crash and and/or personal injury.

More of an explanation.
I have a Chinook fitted with 6 Futaba 9252 servos, whilst performing a pre-flight I noticed "RP" servo appeared to be dead, ie you could move it by hand but only when you cornered the stick full up collective & full left aileron, with TX ATV value's of 150% l&R rudder, 150% U&D elevator & 150% U&D collective, this should not happen.

I checked the servo input voltage & it is present in this condition, I changed the cell pack, I changed the servos, still the same.

Has anybody else experienced any issues with the mixer unit, it is like the trsv-mixer gets to a certain output value & is unable to provide the servo with a signal therefore the servo stays still,if you bring the stick back so that the ouput value drops below 180 (as displayed on the screen)the servo comes back to life & appears to function normally.

Not good, your input is required, please check your HIROBO tandem Helicopters TRSV-MIX output values & let me know.

Thanks Derek.
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09-25-2006 09:45 PM  14 years ago
melsman

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Atascadero, CA

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Hi Camel Jokey,

I also found that maxed out transmitter end points (ATV 150%) have a strange affect on the TRSV. At least from a JR transmitter. Jeff Green flies with maxed endpoints on his rudder and has not had any problems. But he flys Futaba. I reset my TX end points back to 100% and have left them there.

Ashley
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09-25-2006 10:28 PM  14 years ago
MRC-Hirobo

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Edison, NJ

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I did set my rudder channel to 140 but have since gone back and made the adjustment for throws at the servo output screens, front swash mixing and rear swash mixing. The only channels I felt needed adjustment were the front and rear rudders. The cyclics felt fine.

What are you needing to overdrive?

To get more output on a channel you may need to adjust each servo's output in the box accordingly like i did with the rudder feeling.

Please, more info to help more.

jeff
MRC Host
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09-26-2006 09:41 AM  14 years ago
Camel Jokey

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Dubai, United Arab Emirates.

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Thanks for the reply.

I have since checked the output values using a servo pulse meter, it appears that at the normal travel limits the servos are capable of recieving a signal that is beyond their capable range, ie: - above 219ms pulse width & below 80ms, this is the TRSV-MIXer signal amplifier.

To overcome this problem you need to set the travel limits on the mixer accordingly, this was not made clear enough in the manual, normally the servos cannot recieve a signal greater than 200ms or less than 100ms, but with the mixer they can & my point is that this is VERY dangerous.

The servo looses power & effectivly dies untill the pulse with comes back within the tolerance window.

I found that I needed to increase the values more than normal to give the machine more rudder authority & more elevator travel.

It flies OK now with the settings applied & this has also removed the issue with the servos overtraveling.

Let me know if you need any more info.
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10-15-2006 07:25 AM  14 years ago
Camel Jokey

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Dubai, United Arab Emirates.

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Can anybody tell me if P/N 0402-591 SE main gear 77T ($50)& P/N 0403-219 main gear 77T ($6) are interchangable?

Its for a CH-47 Hirobo Chinook, manual P/N is the 0402-591.
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