RunRyder - Flybarless standard by 2009, solenoid swashplate next?

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Flybarless Rotor Head Systems > Flybarless standard by 2009, solenoid swashplate next?

wxyz
Senior Heliman
Location: calif*, U know where

After converting a Trex 450 SE V2 to flybarless & getting very stable results, was convinced that software flybars R simple enough to replace mechanical flybars completely in the next year.

The next horizon could be solenoid swashplates. That would involve replacing 3 servos & swashplate with a solenoid. The solenoid would hum in the period of a head revolution, achieving the same effect of a swashplate. This has already been done on Picco Z's.

02-19-2008 08:45 PM

darkfa8
Key Veteran
Location: Eatontown, NJ, USA

how did you convert your trex to flybarless?

what is all that gear underslung from your's?

- Dan G. -

02-21-2008 03:52 PM

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wxyz
Senior Heliman
Location: calif*, U know where

Everything is custom. 3 ADXRS150 gyro boards from Sparkfun & a hand soldered PIC18f do the rotor stabilization, tail stabilization, & CCPM. Extra components R for autopilot. Obviously if U have enough money U should buy a commercial product, but this configuration seems to defy all the horror stories about flybarless 450's. CF blades were rock solid too.

02-21-2008 11:23 PM

Eco8gator
Key Veteran
Location: Palm Beach Gardens, FL

What horror stories do you speak of?

02-25-2008 06:19 PM

wxyz
Senior Heliman
Location: calif*, U know where

OK, flybarless 450 roundup.

http://www.runryder.com/helicopter/t381878p1/

http://www.youtube.com/comment_serv...ature%3Drelated

http://www.rcgroups.com/forums/show...47&postcount=10

http://www.youtube.com/watch?v=X5kD_ziugMQ

Most people R having difficulty getting stability without special blades. The reason our software seems to work better than the others is probably the lowpass filtering. Most people use tail gyros on the cyclic but these have almost no lowpass filtering, so they reduce the gain by using shorter servo horns, less cyclic throw, & heavier blades.

In the first tests without lowpass filtering, found the cyclic axes to have much more noise than the yaw axis, so we implemented the filter & got away with very high gain.

02-25-2008 07:21 PM

Eco8gator
Key Veteran
Location: Palm Beach Gardens, FL

From my tests you can fly a 450 heli with std blades. Its a little wilder(with no stab) than I though but the simple fact is you lost a lot of mass in the disk...> 25% in the case of a 450 sized heli. In a larger 500-600 sized Logo, heli the disk mass loss is about 10%...quite a bit less.

A long story short you can fly a logo with no stabalization but it has some bad flight properties that the stab system fixes.

A 450 TREX is a huge chore to fly with no stab...its almost unflyable. With stab(well with the system I designed) I can get the heli to fly pretty well with non modified blades but to get the exact same feel and control you do with a flybared 450 sized machine Ive found that heavier blades help a lot...also makes autos super easy

To be more specific the stab system can only do so much there must be a solid mech setup behind it for the entire system to work well. With std blades you can get pretty crazy with the rex but try to do any technical timing manuvers and youll find that its harder to do than if it was flybared(not what people want IMHO)...I can only speak for what Ive designed.

Now a T500 barless does fly quite well with the stock blades so converting it was quite easy...just slap on some stab and it flys pretty nice

02-25-2008 08:01 PM

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Flybarless Rotor Head Systems > Flybarless standard by 2009, solenoid swashplate next?

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