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HelicopterMain Discussion › Pirouette Power
09-02-2009 06:54 PM  8 years agoPost 1
Darren Lee

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Woodstock, GA

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I have a problem with the tail on my Knight 3D. It is easy to bog the tail system by traveling at a moderate forward speed and piroing right, against torque. The tail gets 90 degrees and just stops. It seems as if it doesn't have the power to fight the relative wind.

My setup is Spartan DS760, Futaba 9256 with linkage 17mm from center, 95mm carbon tail blades. I've tried several different kinds of tail blades and also increased the gain until it was too high and backed off a few points. Should the linkage be closer to center so I get more torque from the servo? Any other ideas?

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09-02-2009 07:02 PM  8 years agoPost 2
Dood

rrProfessor

Wescanson

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the Knight 3D is capable of A LOT of tail pitch.

I forget exactly how much, but it looks to be like 60° or something crazy like that. (and thats just on one side!)

If you're running maximum tail pitch, then I think I may have identified your problem.

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09-02-2009 07:08 PM  8 years agoPost 3
Darren Lee

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Woodstock, GA

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Actually, I'm not running max available pitch. Are you implying that too much pitch would stall the blades and cause them to lose lift?

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09-02-2009 07:20 PM  8 years agoPost 4
Dood

rrProfessor

Wescanson

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How else would you bog the tail?

I used to have a Knight 3D. And I too would bog it down by using way too much rudder.
I reduced the tail throws, and the problem went away.

The tail never did have much authority.

I was using a GY611.

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09-02-2009 07:27 PM  8 years agoPost 5
flyboy907

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woodstock, ga

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this confuses me because I have personally seen this happen to Beeflyers bird on monday. If you don't jam rudder over and slowly start your piro and it reaches a point where it just stops and doesnt turn anymore I would say that it is not bogging down. I vote for using max pitch and let the gyro and tail have full available throw to achieve what input you are telling to do.

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09-02-2009 07:31 PM  8 years agoPost 6
Darren Lee

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Woodstock, GA

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Maybe "bog" is the wrong word to use. The headspeed doesn't slow down, the tail just won't turn past 90 degrees and I can hear it fighting the relative wind. It looks like the tail hits a wall.

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09-02-2009 07:34 PM  8 years agoPost 7
flyboy907

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woodstock, ga

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darren you are using 92s or 95's

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09-02-2009 07:37 PM  8 years agoPost 8
Darren Lee

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Woodstock, GA

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95mm carbon tail blades

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09-02-2009 07:41 PM  8 years agoPost 9
flyboy907

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woodstock, ga

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lol oh yeah, you know me .

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09-03-2009 04:05 PM  8 years agoPost 10
J2M

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UK

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I have a couple of K50 3Ds and my preferred piro direction for piro loops, chaos etc. is to the right. I have never encountered a situation on the K50 3D when the tail lacks authority or appears to stall. As Dood says, there is a lot of pitch available! My machines are setup to use the maximum available travel on the tail pitch slider and the only problem I have is that the tail can demand so much power (e.g during 200ft diameter sideways loops into wind) that the engine struggles to maintain RPM. I would say max out the tail travel, use 95mm tail blades, check you're in heading hold mode and have sufficient gain on the Spartan, tune your engine for good power and you should be fine. If not, check for sticking bearings in the tail blade grips, lack of tail belt tension or other mechanical reasons

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09-14-2009 01:42 PM  8 years agoPost 11
Darren Lee

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Woodstock, GA

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Increased my gyro limits to full available slider travel and the problem is now fixed.

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09-14-2009 02:15 PM  8 years agoPost 12
J2M

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UK

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Increased my gyro limits to full available slider travel and the problem is now fixed
Good to hear

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09-15-2009 01:27 AM  8 years agoPost 13
Yug

rrMaster

UK. Herts

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Yu know, if you really want good tail authority and maintain a constant high piro rate during fast manouvers, then you need to concentrate on tuning the tail grip "chinese weights". Without this, excessive demands are placed on the tail servo with the result that it simply can't deliver the performance as demanded.

Vegetable rights and Peace

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