How hard can u push a GY401

[shikari_chaos]

Ok guys so I have a Raptor 50 with a GY401 on it and a T-Rex 500 with the align GP780. I've started doing a lot more inverted, backwards flight, tic tocs and piro flips recently with the 500 but wanted to know whether the GY401 will cope with this type of flying? ( I know it doesn't have a consistant piro rate )

Many thanks for any info

[sacko]

You will know when it cant take anymore as it blows out. Just keep going until you neeed a new one

[shikari_chaos]

lol that was what i was afraid someone would say! I don't fancy that idea :s

[sacko]

Get a proper gyro then like a Quark

[Dave Rand]

Re: How hard can u push a GY401

The 401 on my beam is to be honest very good, did have a few issues with it blowing out coming out of a piro stall turn backwards turned out to be the gyro wires were touching the case, I moved the wires put a sparten gyro pad on it and it's been super :-)
Yes the quark on my velocity is wicked but run the 401 till it can't keep up with your flying then get a quark.


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[trillian]

On a related note, is anyone still using some of the older CSM gyros like the 560 or 420? How do they compare to the GY401?

I know the 720 was being highly praised not long ago but I happen to have a few of the older ones and have not used them yet.

[shikari_chaos]

The 401 on my beam is to be honest very good, did have a few issues with it blowing out coming out of a piro stall turn backwards turned out to be the gyro wires were touching the case, I moved the wires put a sparten gyro pad on it and it's been super :-)
Yes the quark on my velocity is wicked but run the 401 till it can't keep up with your flying then get a quark.


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Yeah this is the problem... I don't really want to risk it blowing out at a bad moment hence why I haven't pushed the raptor... and since the quarks on sale..... lol

[Supercaptaincrash]

Hi sheryl! i have a 560 micro on my raptor 50 and to be honest never had a problem with it aprt from the csm supplied foam was never any good so used a futaba one! been flying it for about 1 1/2 years and never had a problem!quite a nice size for the smaller helis as well!

[trillian]

Hi sheryl! i have a 560 micro on my raptor 50 and to be honest never had a problem with it aprt from the csm supplied foam was never any good so used a futaba one! been flying it for about 1 1/2 years and never had a problem!quite a nice size for the smaller helis as well!

That's good to know. I have the 560 micro as yet un-used but will be looking to put it on something eventually or replace one of the 401s.

I have a Robbe Futura that came with a CSM 420 on it and so far I have just hovered it in the garden to get the basic setup working but it seems to hold really solid (obviously that's not much of a test but it feels really locked in).

When I first flew with an instructor around March or April of 2008 the Raptors I flew out at Paul Heckles place had CSM gyros but I don't know what model number, I just remember they were the big grey case units, and they seemed to do the job very well.

[lex7919]

The 420 is a pretty decent gyro it will surprise you for the amount it costs!

On the 401 i wouldnt even bother just swap it out ASAP.

[moyesboy]

The 401 is a very capable gyro.
If you are looking to test the blow out, then take the heli high and let it fall either blackwards or sideways vertically down, if it blows out it will turn so its going forwards.
I found the way to get my 401 to let go on my 450 was to do a long backwards dive and then pull up into a backewards loop - it would let go at about 10 o clock just before the top of the loop - quite high and usually enough tome to figure it out and gain control!

To get maximum hold before letting go ignor the setting up of the linkage to stop it piroing in rate mode - just set it up to use the maximum throw of the servo both ways without binding, and fly only in HH. Adjust the length of the seervo arm so you can get the limit pot as close to 100% as you can.

The CSM560, big old grey thing, is the same gyro as the big grey CSM420 I think, just the 420 doesn't have the PC interface so is a 560 on default settings.
My 560 worked great on my raptor - you have to be very carefull not to move the heli as it initialises or you end up with drift. It does suffer from a tiny bit of drift sometimes.
Also compared to the 720 the tail is not quite so precise, tending to wander an inch or so from side to side constantly. I thoink this is becuase of its inferior sensor. I expect the same thing from the new smaller 560 which still uses the same sensor.
The sensor in the 720 is more expensive and more precise - and I strongly suspect its the same chip at the heart of all the modern gyros.

Becuase of the big grey 560 case it tends to wobble a bit when you do sudden things, and that of course makes the rudder servo move. My solution (suggested by Edders actually) was to strap it down with a velcro tie, compressing the CSM foams a little. Experimentation with that found the sweet spot.
I flew my raptor 50 with a 401 and the old 560 and there was little to choose between them in terms of letting go, but the pro consistency was much better on the CSM, the 401 whipping into wind. The 401 wouldn't piro as fast as the 560 though - even with the rudder ch end points set high.


Incidentally I never got the 401 to let go on the raptor .50 - only on the 450 where the tail isn't as powerful.

The 401 also flew very nicely on my trex500 - but the 720 is better and with CSM just up the road in "Royston Vasey" its the obvious choice round here.

[moyesboy]

Fly CSM, you local gyro, you'll never leave!
(the fictional town of Royston Vasey is filmed within a mile or two of CSM's office.)

[Delta7]

Can the CSM's be used with the S9254 or do they have their own matching servo's?

[moyesboy]

CSM will work with most tail servos.

To use the peculiar Futaba 9256/bls251 with the 720 you need the CSM PC lead to change the servo settings from the std ones.

I have a 720s working with 9650, DS520, 9254 and BLS251
My old 560 was driving the 9254

[Kwickkwack]

Good point regarding the 401 Gordon, it was only a few years ago that it was the gyro of choice, it is still the same gyro today, yes others have moved on but that does not make it a bad gyro.