six axis gyro

[utrinque]

http://invensense.com/mems/gyro/mpu6000.html

This little guy is using six axis gyro: Walkera Genius CP

http://www.micro-helicopters.net/201...ro-helicopters

another mCP X competitor:
http://www.hobbyking.com/hobbyking/s...dProduct=19178

Any thoughts?

[petedee]

Personally my preference is for any that will BNF with my current radios, as far as I can see that means the Blade MCPX. They all look nice and have some good features but happy to pay more for the BNF and a good product.

Cheers.

Pete

[arabidkoala]

Do realise that it is not a 6 axis gyro (which doesn't make sense anyway...), but a 3-axis gyro plus a 3-axis accelerometer. From a practical standpoint, the addition of the accelerometer doesn't really do much to either stability or performance.

[65L88]

Originally Posted by arabidkoala

Do realise that it is not a 6 axis gyro (which doesn't make sense anyway...), but a 3-axis gyro plus a 3-axis accelerometer. From a practical standpoint, the addition of the accelerometer doesn't really do much to either stability or performance.

Not sure why you say this. In the proper application, accelerometers can have a considerable effect on both stability and performance. I have 2 helis with Skookum 720s, and believe me, the 3 axis accelerometer definitely has its benefits. I'm curious if you've had any firsthand experience with 6 axis??

[DudeInMyrtleBeach]

The mcpx has taken off like a rocket. There are readily available parts, a ton of aftermarket replacement parts, and a ton of tried and tested hop ups that make it a beast that outperforms anything in its class.

The Genius is nice, but it's late to market. Parts exist but are expensive and have limited availability.

The verdict on the Solo Pro 100 is still out. There are *some* parts advertised, but none available. Might not be a problem in the future, but it is for now.

Here in the states (don't know about Poland) the mcpx rtf (albeit with a shit transmitter) is $169 with free shipping. That's cheaper than the solo pro shipped from HK. You can make a mcpx brushless, and it will still be cheaper than a stock Genius.

That's my take.

[arabidkoala]

Originally Posted by 65L88

Not sure why you say this. In the proper application, accelerometers can have a considerable effect on both stability and performance. I have 2 helis with Skookum 720s, and believe me, the 3 axis accelerometer definitely has its benefits. I'm curious if you've had any firsthand experience with 6 axis??

Unless I am mistaken, with aircraft like this what you want to control is the angular velocity. It follows that to do this, you only need a rate-gyro. Heading/Attitude holding can be done with the integration of the rate-gyro.

Accelerometers give you an estimate of formal acceleration in the body frame (including g and all the fictitious forces). This doesnt help the angular actuation at all, which is what a adept pilot would be controlling. Accelerometers do, however, allow you to estimate the spatial velocity of the aircraft which can be used for "coaxial-like" flight, but this would only be advantageous to a beginner.

Looking at the skookum 720 fbl system, it looks like it uses some very high quality components. What you may be noticing is the high-quality gyro and control algorithms they employ within the device. It is likely, if you are doing stunt flying, that you have the features that the accelerometer provides turned off.

Yes, I have experience with IMU's, but more in the context of making and doing sensor fusion with them. They tend to have really good (ish) applications in aerial robotics

[65L88]

Originally Posted by arabidkoala

Unless I am mistaken, with aircraft like this what you want to control is the angular velocity. It follows that to do this, you only need a rate-gyro. Heading/Attitude holding can be done with the integration of the rate-gyro.

Accelerometers give you an estimate of formal acceleration in the body frame (including g and all the fictitious forces). This doesnt help the angular actuation at all, which is what a adept pilot would be controlling. Accelerometers do, however, allow you to estimate the spatial velocity of the aircraft which can be used for "coaxial-like" flight, but this would only be advantageous to a beginner.

Looking at the skookum 720 fbl system, it looks like it uses some very high quality components. What you may be noticing is the high-quality gyro and control algorithms they employ within the device. It is likely, if you are doing stunt flying, that you have the features that the accelerometer provides turned off.

Yes, I have experience with IMU's, but more in the context of making and doing sensor fusion with them. They tend to have really good (ish) applications in aerial robotics

I agree with you on all counts. However, no one ever accused me of being an adept pilot, so for the time being, the bailout feature of the SK720 is a great thing for me while I'm working on my ccpm skills and progressing into the rudiments of 3d flying.

[arabidkoala]

Originally Posted by 65L88

I agree with you on all counts. However, no one ever accused me of being an adept pilot, so for the time being, the bailout feature of the SK720 is a great thing for me while I'm working on my ccpm skills and progressing into the rudiments of 3d flying.

Oh well in that case, happy flying

[firedragon]

yes genius is late and brushed. i like [ame]http://www.youtube.com/watch?v=RpgT0u80TEY[/ame]

but i wait for users review of crashability of tail. if is good, will be a nice hely and i will buy my first walkera.

[DudeInMyrtleBeach]

Man, that is beautiful. Sometimes I wish I didn't have $1,000 in spektrum radios.

Originally Posted by firedragon

yes genius is late and brushed. i like http://www.youtube.com/watch?v=RpgT0u80TEY

but i wait for users review of crashability of tail. if is good, will be a nice hely and i will buy my first walkera.

[GB ian]

After two years of very expensive flying walkera helis similar to the one in the video I had spent easily $2000 in buying the helis and keeping them flying.

They never flew well and did not crash well at all. I could only barely hold an inverted hover after finding a large space to flip over in. The shaft driven tail is awful as is the tail servo.

I have several Trex 600 helis so I knew how to set things up right and i had wanted the small heli to practice with close to my house.

I bought an mcpx and have never looked back.

My own opinion is that Walkera should be avoided the quality is not there and the parts always need to be ordered online.

With the BL mod and a 120 tail motor the mcpx is ballistic and fully 3D capable.

This is just my opinion, but if you want to save a lot of $$ and actually spend your time flying and improving stay with the mcpx