gyro specifics, please.

trickybit · 12-04-2009, 01:45 AM

So, I'm flying in a nice open space setting, in a triangle between some trails. Very rarely a conflict with passersby or dogs off leash, but a lot of people come through the trail behind me and stop on my benches and watch me fly. I explain the hobby and the technology to them.

I typically point out that the gyro is the most amazing piece of technology. The batteries come out of the laptop/device market, the radio is wi-fi, etc etc but the gyros come out of guidance systems. I try to find words to explain how much work they do, and how incredibly accurate they are, but I don't know the specs.

I've read a good article on the MEMS theory in RC Heli and some stuff on Wikipedia. Somebody here once compared the components in a Sparton 760 and a GY520 (same gyro I think) by name.

I'd like to know more about the specifics, rather than the theory. Can anybody speak to these questions?

What is the component (company, model) used in some hot modern gyros?
What is the accuracy of these components, like minutes per minute or something?
What else are these components used in? I once read "Howitzers" but that leaves everybody asking whether you can steer a howitzer shell.
What's the component cost in 000s for a part like that?
I assume we get the commodity/citizen stuff, anybody know how accurate the good (military, aerospace) stuff is?
Somebody posted that the components can withstand hundreds of G's. Is there a datasheet on that?

Thanks.
Jim

Beachcomber · 12-04-2009, 08:46 AM

You are over my head, but will offer what little I think I know.

Sensors used in modern heli gyros fall into 2 groups, piezo and mims (might not spell correctly). The piezo sensors are less expensive and usually found in gyros costing less then $100 us, with mims sensors found in upper quality gyros, costing more.

Skiddz · 12-04-2009, 09:37 AM

http://www.helifreak.com/showthread.php?t=76808

trickybit · 12-04-2009, 09:57 AM

Quote:

Originally Posted by Skiddz

http://www.helifreak.com/showthread.php?t=76808

Yeah, that's a great posting. But on scanning it again I didn't see the specifics I was looking for among the great explanations of the theory.

I guess I'd like to see the data sheet for the component they use in a Spartan, for instance.

Jim

Tail boom · 12-04-2009, 10:40 AM

Quote:

Originally Posted by trickybit

Yeah, that's a great posting. But on scanning it again I didn't see the specifics I was looking for among the great explanations of the theory.

I guess I'd like to see the data sheet for the component they use in a Spartan, for instance.

Jim

Hi,

You might want to shoot a PM to HFG. He is quite knowledgeable about things like that.

Best,
Frank

laminarjack · 12-04-2009, 12:26 PM

The gyro technology referenced for howitzers is not for the ammo. It's for precision "gun laying," or aiming of the piece for each shot. As an artillery piece fires and recoils, the next shot can vary from the first due to small movement of the gun. If the exact horizontal line of the bore and elvation of the bore is known, it's just a matter of how much powder oor shot charge to hit a specific distance. Conversely, if a target at a certain range is to be hit, changing the elevation of the barrel up or down will allow that target to be hit precisely. A gyro on the horizontal and vertical axis would help with this.

trickybit · 12-04-2009, 05:51 PM

Ah, so. Good idea, and good info.
thx much

12-04-2009, 01:45 AM	#1
trickybit Registered Users My HF Map location Join Date: Sep 2007 Location: Palo Alto, CA	gyro specifics, please. So, I'm flying in a nice open space setting, in a triangle between some trails. Very rarely a conflict with passersby or dogs off leash, but a lot of people come through the trail behind me and stop on my benches and watch me fly. I explain the hobby and the technology to them. I typically point out that the gyro is the most amazing piece of technology. The batteries come out of the laptop/device market, the radio is wi-fi, etc etc but the gyros come out of guidance systems. I try to find words to explain how much work they do, and how incredibly accurate they are, but I don't know the specs. I've read a good article on the MEMS theory in RC Heli and some stuff on Wikipedia. Somebody here once compared the components in a Sparton 760 and a GY520 (same gyro I think) by name. I'd like to know more about the specifics, rather than the theory. Can anybody speak to these questions? What is the component (company, model) used in some hot modern gyros? What is the accuracy of these components, like minutes per minute or something? What else are these components used in? I once read "Howitzers" but that leaves everybody asking whether you can steer a howitzer shell. What's the component cost in 000s for a part like that? I assume we get the commodity/citizen stuff, anybody know how accurate the good (military, aerospace) stuff is? Somebody posted that the components can withstand hundreds of G's. Is there a datasheet on that? Thanks. Jim __________________ Logo 600: Jive, BLS, VBar "Hansen Built" T-Rex 550E: ICE, BLS 251, VBar Protos 500 (plastic): Jazz, Hyperion/Scorpion, VBar BLS 251 Tornado Coin-Op: Gray marble, XTremeSoft wraps

12-04-2009, 09:37 AM	#3
Skiddz HF Support My HF Map location Join Date: May 2006 Location: Carlsbad, CA (USA)	http://www.helifreak.com/showthread.php?t=76808 __________________ -Kevin No helicopters were harmed in the creation of this post. AMA CD # 7309, Turbine Waiver# RW 890 To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

12-04-2009, 05:51 PM	#7
trickybit Registered Users Thread Starter My HF Map location Join Date: Sep 2007 Location: Palo Alto, CA	Ah, so. Good idea, and good info. thx much __________________ Logo 600: Jive, BLS, VBar "Hansen Built" T-Rex 550E: ICE, BLS 251, VBar Protos 500 (plastic): Jazz, Hyperion/Scorpion, VBar BLS 251 Tornado Coin-Op: Gray marble, XTremeSoft wraps

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12-04-2009, 08:46 AM	#2
Beachcomber Registered Users Join Date: Jan 2009 Location: Savannah, Ga	You are over my head, but will offer what little I think I know. Sensors used in modern heli gyros fall into 2 groups, piezo and mims (might not spell correctly). The piezo sensors are less expensive and usually found in gyros costing less then $100 us, with mims sensors found in upper quality gyros, costing more.

12-04-2009, 12:26 PM	#6
laminarjack Registered Users Join Date: Jun 2009 Location: alexandria, la	The gyro technology referenced for howitzers is not for the ammo. It's for precision "gun laying," or aiming of the piece for each shot. As an artillery piece fires and recoils, the next shot can vary from the first due to small movement of the gun. If the exact horizontal line of the bore and elvation of the bore is known, it's just a matter of how much powder oor shot charge to hit a specific distance. Conversely, if a target at a certain range is to be hit, changing the elevation of the barrel up or down will allow that target to be hit precisely. A gyro on the horizontal and vertical axis would help with this.