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HelicopterRadio - Servo - Gyro - Gov - Batt › Please help with gy502
10-08-2005 10:28 AM  12 years agoPost 1
sir777

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Moscow, Russia +​Lloret de Mar​(Girona), Spain

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Hi! I probably have a problem. I have a hirobo sceadu evo50 with agy502. I have read on http://www.jkheli.com/ that I should "Adjust your tail linkage so that your tail servo limit setting (last menu) is over 100% NOT under. Set the travel equally for both A & B at around 110% to 120%. Setting the limits under 100% can reduce the life of the servo." It is actually for gy601, but I think that ts is the same for the gy502. On my heli I have such a mechanical neutal point of tail linkage, that it it shifted to one side very much and I need to have about 50-55% limit to the left and all the 145% to the right (and I even don't reach full mechanical throw to the right). Will it be ok to leave it that way? I think that if the total servo travel will be around 200% (as I have, 145%+55%), it will be ok. Or am I wrong? Please help me, guys. It is also very strange why I have such a mechanical neutral point in the tail, because other guys don't have is so much shifted.

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10-08-2005 07:01 PM  12 years agoPost 2
Dr.Ben

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Richmond, VA, USA

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Am I reading you to mean that when you have the linkage set up to where the model would hover in rate with no trim, the limits have that much assymmetry?

Ben Minor

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10-08-2005 07:04 PM  12 years agoPost 3
sir777

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Moscow, Russia +​Lloret de Mar​(Girona), Spain

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That's right!

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10-08-2005 07:15 PM  12 years agoPost 4
Dr.Ben

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Tell you what I'd do..............

Go over to the Hirobo forum and ask someone who has an Evo to measure where their slider is the the t/r ouput shaft compared to yours at hover trim.

Also, how large is your servo wheel?

I knew that Hirobo had this issue on the 346 model, butI hadn't heard about it on the Evo. Normally, when there is a linkage asymmetry on a model, I suggest setting the throw for the short side of the travel and just matching the long side for the same value, but that assumes that you're in the ballpark of 100% on the short side. I would think you should be able to get that limit over 55% with a typical servo arm radius.

Stock t/r blades and so forth, right? Servo arm is square on the servo when everything is in neutral (check it ONLY in the LIMIT mode)?

Oh, BTW, gain parameters for the 601 do not apply as well to the 502. It'll take more for the tail to hold well.

Ben Minor

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10-08-2005 08:55 PM  12 years agoPost 5
sir777

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Moscow, Russia +​Lloret de Mar​(Girona), Spain

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Thank you for answer, Dr.Ben! I found in the Hirobo forum that distance, but it is completely different to what I have. I understand what you mean, I can get more than 100% on the short side by using, let's say, a 11-12 mm wheel, but that way I will have very little throw to other side , even using full 145% limit on it. I think that it will cause very bad piro speed and maybe some other issues with gyro not working correctly. My gain is ok. I have everything square in rate mode. And I have everything stock, except tail blades- I used longer (92mm, I think) blades from Freya, because guys told me that they will hold better. I had the same problem with the stock blades. It is very-very strange case, because everybody else doesn't encounter such problem on evo. Could it be something related to servo or gyro going?

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10-09-2005 05:06 AM  12 years agoPost 6
Dr.Ben

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Richmond, VA, USA

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If you can get in the neighborhood of 100% on the short side using a 12-13mm wheels, the gyro should work fine regardless of how much excess throw there appears to be on the long side. Match the long side to whatever the short side comes up to (hopefully 95% or greater), then go fly the thing. Tell me if you see a piro problem. I'll think about it some more if your see an issue in the air.

Ben Minor

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10-09-2005 02:10 PM  12 years agoPost 7
sir777

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Moscow, Russia +​Lloret de Mar​(Girona), Spain

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Actually, my gyro seems to work fine even with that setup, I am just aware that it will cause any problems with servo itself. Thank you for the tip, so I move the ball to about 12 mm and put the same limit to both sides? I will try that on the next week and tell you the results.

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10-09-2005 05:05 PM  12 years agoPost 8
Dr.Ben

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Richmond, VA, USA

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Try to get the radius to at least 12 mm and the short side limit to right at 100%. Match the long side to that value and have at it.

Ben Minor

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10-11-2005 09:21 PM  12 years agoPost 9
sir777

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Moscow, Russia +​Lloret de Mar​(Girona), Spain

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I am sorry, Dr. Ben, but could you tell me more clearly (acutally. it is not unclear,it is just my bad english ), that I should do the same limit to both sides with about 100%. I think, I will try it tommorow. I put the ball on the servo arm closer to the center and now I can reach full throw on the short side with about 105% limit. On other side it is not possible to get the full mechanical throw, even with 145% limit. Thank you.

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10-12-2005 12:32 AM  12 years agoPost 10
Dr.Ben

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Richmond, VA, USA

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Do NOT worry about the long side. If you achieved that maximum available throw in flight on the long side you would sling the whole ass end of the model off in flight with hard over pirouettes.

Again, set the long side limit to whatever you ended up with on the short side (yes, even though you didn't max out the mechanical travel on the long side) and fly the thing. It'll work fine.

Ben Minor

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11-04-2005 02:31 PM  12 years agoPost 11
sir777

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Moscow, Russia +​Lloret de Mar​(Girona), Spain

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Dr.Ben, thank you a lot!
I finally had the time to mess with my heli. I switched from cp15% to byron 15% and had a chance to setup my engine correctly. After that I started adjusting gyro and could put the tail slider almost in the medium of its travel and it holds great! I was even able to put a 17 mm arm back and I have now about 115% of travel to each side. The piro rate with maxed out EPA on rudder channel is amazing, I even had to slow it down a bit. Thank you very much for help!

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11-04-2005 05:48 PM  12 years agoPost 12
Dr.Ben

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Richmond, VA, USA

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Good deal

Ben Minor

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HelicopterRadio - Servo - Gyro - Gov - Batt › Please help with gy502
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