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Home✈️Aircraft🚁HelicopterGasser Model RC HelicoptersOther › Which gyro the 401 or the 611 for a gasser?
04-03-2010 06:24 PM  10 years ago
oldfart

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Vancouver, Canada

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The biggest reason for tail issues on gasser (and a lot of nitros also) is in how the gyro is attached to the heli.

I have found the 401/9254, does a relatively great job, if it is attached according to the instructions using the supplied Futaba double sided tape, (as do all other Futaba gyros) specially if one layer attached to the gyro, which in turn is stuck to an isolating solid plate, then another layer of the Futaba tape attached to the bottom of the gyro.

PS. I have successfully flown a fair bit of 3D with a gasser, using the GY401/9253 and 9254 servos. SO I am not at all shy of using it on any of my gassers.
Phil
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04-03-2010 11:43 PM  10 years ago
smallplanes

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Thats olddude i think the 401 is what it will use i can't out fly the 401 i was just wondering about the extra vibration of the gas. Thanks for your help you have been good to me old dude.

Thanks
Ivan

Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br
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04-04-2010 01:02 AM  10 years ago
oldfart

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Vancouver, Canada

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You are welcome Ivan

Of note, is that there is different vibration modes in ALL helicopters. They are of lower frequency in gassers, but much greater in amplitude. So the way the gyro is attached to the frame is a bit more critical in gassers then in nitros, which again is more critical then in the smoother running electrics.

But, any decent gyro (and that includes all from Futaba, including their inexpensive GY240) can be properly mounted and set-up for good performance in all three.

To prove my point a few years ago, I even mounted an inexpensve yaw rate pizo gyro that Century used to sell for their small Hummingbird electric helis, into my Predator GS and proceeded to do the 2004 FAI/F3C maneuvers with it. I subsequently flew it a whole summer in my 50 sized Bell 47 GIII scale nitro heli.

In gassers, the different frame designs and the different materials they are made from, greatly influence these vibration modes, and how they are transfered through the frames. Over the years I have found these two criteria (frame designs and materials used) to be relatively critical in causing some gyros to be a bit more difficult to get right in one type, then in another.

This, I have found, is also why some designs seem to be more prone to cracking muffler headers, or shaking mufflers loose etc. then are others.
Phil
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04-04-2010 04:20 AM  10 years ago
jschenck

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La Vista, NE.

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I have Zeal under the sensor for my 601 on my Predator. This combo works really well. That tail hold very tight - tail slides, fast backward flying ect. I really think the Zeal is a good match with my Predator and 601. I don't think Zeal is right for my Nitro's but sticking with it here.
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04-04-2010 02:27 PM  10 years ago
smallplanes

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Thanks olddude, I have one more question i have wondered about for years ,i know the gyro has to be perpendicular to the main shaft but does it matter if it square to the mainshaft? What i mean is can it be turned in any angle 360 degs to the main shaft as long as its still perpendicular to the main shaft? I always made sure mine was square to the main shaft. What do you think?

Thanks for all the info
Ivan

Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br
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04-04-2010 05:39 PM  10 years ago
oldfart

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Vancouver, Canada

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As long as it is perpendicular to the manshaft it does not matter if its rotated so that its' side, front or back is facing the mainshaft, it will still always detect the same angular velocity and interpret the corrections needed in the same way.Phil
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04-04-2010 08:55 PM  10 years ago
smallplanes

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Thanks olddude you saved the day again,i have always sqed my gyro to the main shaft just to be safe. You say you have it on a spectra which way should the the direction be on the 401 i get this this wrong every time?

Thanks oldtimer you know you ****
Ivan

Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br
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04-04-2010 09:17 PM  10 years ago
oldfart

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Vancouver, Canada

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Sorry Ivan, I do not have a Spectra, so cannot tell you where to put the gyro.

I have a Predator GS now for many years and it has become one of my favorite helis of all time. (Looking forward to spending some time with the Radikal this flying season).

Before that I had (and still have) a TSK Mystar GS (needs some minor repair), a JR and an X-Cell (long since sold).
Phil
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04-04-2010 09:29 PM  10 years ago
smallplanes

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As soon as my money gets right i'm going to buy a Preditor. I think the Radikal is still a toys r us heli i will buy the big dog.

Thanks for your help
Ivan

Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br
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Home✈️Aircraft🚁HelicopterGasser Model RC HelicoptersOther › Which gyro the 401 or the 611 for a gasser?
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