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Eagle Tree Guardian - 8/30/2012 10:12 AM   
Ripon


 

Posts: 27
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Joined: 5/30/2005
Last Login: 5/19/2013
From: Littlehampton, UNITED KINGDOM
Status: offline 		Does anybody have experience of using this in a twin to help with the dreaded one engine out situation?
Thanks, John

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RE: Eagle Tree Guardian - 9/3/2012 1:08 PM   
Gtarling


 

Posts: 195
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Joined: 11/16/2003
Last Login: 5/13/2013
From: Uxbridge, UNITED KINGDOM
Status: offline 		John - I've just received a Guardian unit, but haven't yet had a chance to try it. so can't help much with a usage report. It's not going in a twin, but an aerobatic model, where I'm hoping it will come to my rescue if needed. I don't think you actually NEED a Guardian for a twin though, I've found previous threads where people have just used a helicopter tail gyro to sense the yaw and give the correct rudder input, though I'm sure some stabilisation in roll would help, too. Frankly, there's really only one way to find out for sure - try one and see! Be sure to report back and let us know, won't you?

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RE: Eagle Tree Guardian - 9/4/2012 2:51 PM   
Ripon


 

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Joined: 5/30/2005
Last Login: 5/19/2013
From: Littlehampton, UNITED KINGDOM
Status: offline 		Thanks for the response (Gordon I think?). I'll try the heli gyro first once I've dug it out of the wreck but will be very interestd to hear how you get on with the Guardian.
John

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RE: Eagle Tree Guardian - 9/9/2012 6:47 PM   
otrcman


 

Posts: 482
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Joined: 10/11/2004
Last Login: 5/19/2013
From: Arroyo Grande, CA, USA
Status: offline 		I'm not sure the Guardian is a perfect answer, but it has possibilities. The question is, do you expect it to keep you out of trouble for a few brief seconds while you get the other engine throttled back, or are you expecting it to provide enough control to permit continued flight on one dead engine ?

In simple rate damping mode (what they call 3D), but with heading lock disabled, the Guardian should buy you some time by slowing down the initial response to power loss. But if you have heading lock enabled in 3D mode, then the Guardian may or may not be your friend. Depending on the aerodynamics of your particular airplane and how you have your Guardian response set up, yaw toward the dead engine could be exaggerated due to adverse yaw from aileron input.

In 3D mode, my understanding of the Guardian is that it will try to keep pitch, roll and yaw attitudes level unless you make a control input. If the airplane begins to yaw and roll into the dead engine and you have no stick input, the system will try to keep you straight and level. But does it use aileron or rudder (or both) to keep your wings level and on the original heading ? And how would your airplane respond to an aileron correction in the presence of a strong yawing tendency ? I think a lot would depend on the particular aerodynamics of your airplane and also on the way the Guardian's many features are set up.

Bottom line is that the Guardian may be a great help, but will require some special testing and adjustments to tune it to your airplane. Unfortunately, the testing could cost you a few airplanes in the process.

Dick



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RE: Eagle Tree Guardian - 9/10/2012 2:40 AM   
Aero65



Posts: 881
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From: Honolulu, HI, USA
Status: offline 		Hello

Im not usally in this area but saw the Eagle Tree thread so here go's
I was one of the Lucky Beta testers and it's a great unit.

I have tested it in 2D = wing leveling mode in take off, flying, recovery, and landing.

I have tested it in 3D = stabilzaton just keep the plane from getting bounced around too much / being unstable.
3D = Direct rate, like a 3 axis gyro that turns off when you move the sticks for better response
3D = Heading hold, w/direct rate a 3 axid gyro that flys like an arrow as long as your plane can hold that line.
For example if you roll right into knife edge it will attempt to hold it to the limits of the servos, setup, and plane. (You can turn auto coordination on and off too)

For twins I want to test engine out, but do not have a plane that I can do it with at this time. I did not see anyone else in the beta that tried that sorry.
2D uses bank angle for heading control, if you turn off turn coordination I belieive the Rudder works as a Yaw damper. Then that might work.... test it on something cheap : )

http://www.youtube.com/user/aero1965?feature=results_main

Here is my YouTube Channel with some of the test flights with my turbine MB339 and F4D skyray.

< Message edited by Aero65 -- 9/10/2012 3:09 AM >

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Aloha, Duke Chung
Hawaii Jets

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