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 Aerobatic FAI F3C F3N Contest>Clarification about 3 axis gyro's used for rudder in F3C contests |
| Bugcatcher Senior Heliman | Hi all,Just a quick question.For contest flying must a gyro only be a tail gyro or can a 3 axis gyro (such as CGY750/Vbar) be installed with the tail function only used in a flybarred heli?Further to that, if for example, a CGY750 were installed. Would the CCPM mixing have to be used with the transmitter, and servo's connected to the receiver,or could the internal CCPM mixer of the CGY750 be used as well with all gains set to zero and servo's connected to the CGY750?How does this work in offical events and how is it monitored and checked during, for example, the World's? In the offical document, it mentions the use of a 3 axis sensor is not to be used. Should that be taken as a 3 axis gyro should not be installed even though the functionality is not activated or used.Thanks.Andy. | ||
| 06-12-2012 Over year old. |
| Bugcatcher Senior Heliman | No one have any thoughts about actual contest requirements regarding this? Find that hard to believe. | ||
| 06-14-2012 Over year old. |
| mpafonseca Heliman | I believe that this is not allowed. I remember reading a post or something else from Curtis when he released the Total-G FAI version. He stated that he had to remove the pitch and roll sensors from the unit to be able to compete. I believe it would be hard to guarantee that you are not using any feedback if you have the servos hooked up. Anyway I believe that this restriction will be removed sooner than we expect. I'm just guessing by the way,Why would you do that? Do you really believe that the giro on the FBL units is better that the tail only?Cheers,Marco | ||
| 06-14-2012 Over year old. |
| Dwight Senior Heliman | Currently in the US we are allowing the system to be used in local events. It is known that there are advantages and disadvantages for the system in FAI so whether you would actually score better remains to be seen. Last year we also allowed it at local events and the flybarless systems did not win any events. It certainly is a superior system in aerobatics but that is assuming you put the sticks in the right places.Dwight | ||
| 06-15-2012 Over year old. |
| Bugcatcher Senior Heliman | I myself wouldn't deliberately run a 3 axis gyro. I use the GY701 on mine. I am not asking whether FBL are allowed, they are not. I am asking if a FBL unit could be used with ONLY the tail axis gyro of the unit be active and the cyclic axis disabled or not used if you wished to utilise equipment you already had.For someone who would normally have a FBL head on there heli, they could simply swap heads and put a FB head on, keep the mixing in the CGY750 or vbar and reduce gains to zero. Less wiring changes but I don't think it conforms to the rules outlined by FAI. You cannot use a 3 axis sensor at all even if you used it as a tail gyro if I read it right.I guess my train of thought is if someone needed to buy a new gyro, they could buy the CGY750 and just use it as a tail gyro only, then they already have FBL unit for the future. Or maybe they have a spare one and could use it instead of spending more money. | ||
| 06-15-2012 Over year old. |
| Four Stroker Elite Veteran | Have you tried the flybar head with the flybarless gyros ? The FBL unit does not know you have a FB although the control loops might be completely wrong. Might work with some adjustment and low gain. | ||
| 06-15-2012 Over year old. |
| Bugcatcher Senior Heliman | Please re-read what I posted. Although in saying that, I do know for fact. Someone I know has used, with success, a CGY750 with the mixing, subtrim and swash settings set, along with zero gain to disable the FBL control loops on their FB head and it flew very well.What I was asking was whether a 3axis gyro/sensor was allowed to be installed, under current FAI requirements, IF only the TAIL axis/gyro was used on the unit. NO cyclic on the CGY750 would be used. | ||
| 06-15-2012 Over year old. |
| Four Stroker Elite Veteran | I understood your question. Mine was an additional question. | ||
| 06-15-2012 Over year old. |
| Bugcatcher Senior Heliman | Personally I have not used a FBL unit to control a FB swash with gains active. I have tried to fly a FBL heli with the FBL disabled and that although flyable, was not alot of fun.A couple of us did consider the thought of experimenting by installing a CGY750 on a FB heli and settings gains low and see how the heli would react. Would the flybar and CGY750 work together or work against each other i'm not sure. | ||
| 06-16-2012 Over year old. |
| Four Stroker Elite Veteran | Well I don't see any problem with the concept of using heading hold on a FB heli in Ail and Elev. at some gain level. The control loop parameters are not directly available to the user and shouldn't be since you would have no idea what to do with them. The parameters that are and the range of adjustment may not make this feasible. But it would be an interesting experiment. Will there come a day when FBL F3C is legal but not FB with a 3-axis gyro ? | ||
| 06-16-2012 Over year old. |
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Aerobatic FAI F3C F3N Contest>Clarification about 3 axis gyro's used for rudder in F3C contests |
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