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HomeRC & PowerAircraftHelicopterRadio - Futaba FASST › Futaba 401 Gyro Poll Info request
10-16-2010 11:40 PM  8 years agoPost 1
MattJen

rrElite Veteran

UK

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Hi Guys,
I apprecite the 401 is old technology compared to the modern gyros on the market, but it is a tried and tested gyro with years of service in many different applications.
I am collating information on this gyro, and i would like to know if anyone has any info as to if any of these have failed?
If they have failed what were the symptoms, what has the gyro done at its moment of failing ? what happened if anything on helicopter.

If anyone can give a brief description of the symptoms, i would appreciate it.

Many Thanks

Matt

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10-17-2010 03:33 AM  8 years agoPost 2
kcordell

rrElite Veteran

O Fallon, MO

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Never had one fail. Works great, just that the Gy520 works better, and now the GY701 even better than that.

Team Synergy/Rail, Team Scorpion, YS Engines, VelTye

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10-19-2010 11:37 PM  8 years agoPost 3
MattJen

rrElite Veteran

UK

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thanks for your reply.. appreciate the info.

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10-19-2010 11:52 PM  8 years agoPost 4
Mark C

rrKey Veteran

Houston, TX - USA

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Many, many, moons ago there was a "hard-over" failure issue but I'm not certain if it was fiction or whatever it seemed to just go away.

I have 401 gyros that have outlasted 5 helicopters and a schmillion flights. I have managed to crash one to tiny bits but that's about it.

I have one on an old R5 airframe that has but a few fragments of ink/paint on the metal label all worn away by time, oil, fuel vapor etc. and it flies just fine.

I have always considered that a 401 was either NIB and deserved a new price or was used - and I don't care how much used. All used 401s fly like they were made yesterday and seem to have no lifespan.

EDIT: I always claim it is wise to keep an old 401 in your box and if you are having severe tail problems and have tried everything else then stick the 401 on and just go fly it.

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10-19-2010 11:55 PM  8 years agoPost 5
z11355

rrMaster

New England

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the only operational problem I've ever seen is that the case material is moderately brittle and can get damaged in a crash, esp. because it's so tall.

I wish all RC electronics were as problem-free as the 401 has been over it's lifespan

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10-20-2010 12:27 AM  8 years agoPost 6
Mark C

rrKey Veteran

Houston, TX - USA

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I wish all RC electronics were as problem-free as the 401 has been over it's lifespan
Could you imagine an ESC that was that dependable?

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10-20-2010 12:41 AM  8 years agoPost 7
MattJen

rrElite Veteran

UK

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Brilliant info guys

a couple of the guys i fly with use the 401 for the very reasons you mentioned..
I looked back through loads of threads on RR and although most could be put down to poor setup, ie tail blades on backwards,gyro not reversed, there wasn't many issues.

thanks again for replying to the thread..

Matt

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10-20-2010 07:59 PM  8 years agoPost 8
copterklutz

rrApprentice

Western Massachusetts

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I have two of them in use.....one is approaching five years of service without any problems.

I had one in a TREX 450 for four years that survived incredible crashes that never fazed it. I sold the helicopter with the gyro still functioning fine...

Was a great gyro back in 2005.....






" Well, Um.... it's fixable......"

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10-21-2010 12:36 AM  8 years agoPost 9
bxc53

rrApprentice

Directly over the center of the Earth ( 98223)

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Same here. I have 3 401's including one in a Raptor 30 with over 55 gallons through it. It takes a hammer ( or major dirt nap ) to kill one.

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10-23-2010 04:20 AM  8 years agoPost 10
Neon Juripuri

rrVeteran

Peculiar Mo USA

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Same here. I have 3. I built my T-rex 450 about 5 years ago with one. I think that gyro is the only thing that hasn't been replaced. It's been flown into the asphalt at full speed. It still works like new.
I keep reading they don't hold in backward flight, but I still can't fly good enough to prove it.
Fred

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10-24-2010 06:58 PM  8 years agoPost 11
Eury

rrProfessor

Dover NH

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I've had dozens of 401s, and never had an issue with any of them. I've had servos fail on them (The 9254 seems to fail on them more often than anything else), but never had an issue with the gyro itself, even after driving them into the ground at high speeds. It even holds well in backwards flight, the only real limit to them is the piro rate is pretty inconsistent. Great gyro.

Nick Crego

Citizen #0168

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10-26-2010 01:20 AM  8 years agoPost 12
Heliman4213

rrApprentice

Pittsford,N.Y. United States

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401 GYRO,in 14 helis
I have 14 of them in fourteen helis ranging from a small 450 to my large Vario Bell 430. I have almost a thousand flights on a Raptor 50 now the Titan with the same 401. In 3d mode it has crashed five times and twice inverted and the gyro still works as well as with all these flights. I cant believe it still works I dont know why. Futaba makes good stuff. I am buying soon the new 701 because it has a governer and I have never had one always set up with out it but it will be nice. The 601 was a great system also but the new 701 they say is great. The 401s have worked for me since they came out and I have never replaced one. Maybe im lucky I dont know but I dont think anyone can say the 401 is not a great gyro. It also depends what kind of flying you are doing. Mild 3d will not test the limits of the 401. I will never fly great to the point where I can tell the diffrence on lets say the 701. The 401 meets my needs and Im just starting to fly backwards fast and they say this is when you can tell a great holding gyro. Hope any of this helps,happy and safe flying to all.

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