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12-11-2004 03:41 PM  13 years agoPost 1
MAX NITRO

rrApprentice

Armadale Western Australia

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Hi Guy's,
Just wondering how to set limits equally on 'A' and 'B' over 100% on my Rappy without having the centre point offset the tail blades?
I was reading somewhere that said I should be able to acheve over 100% limits on both sides at an equal percentage without binding on a rappy 50. Is this achievable?

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12-11-2004 06:22 PM  13 years agoPost 2
rcnuts

rrVeteran

Millersville, Penna

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Yes, and not too hard, if Im understanding you correctly. You will have to move the ball on the servo IN a hole, then you will be able to increase the atv's (on the gyro, as the transmitter should be at 100) to over 100. On every heli Ive built with a 601, I had to go in on the servo horn further than what the manufacturer recommended.
Harris,

Hooligan, at large

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12-12-2004 12:10 AM  13 years agoPost 3
MAX NITRO

rrApprentice

Armadale Western Australia

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once you adjust the neutral point by adjusting the push rod lenght wont the limit A and B have to be changed from your initial set value.

If you have set it for 110% for both A & B before your first flight and then have to adjust the pushrod to get the tail to stay straight in normal mode you will then have to readjust the limits before going to AVCS mode.

Is this correct

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12-12-2004 02:53 AM  13 years agoPost 4
Rodney

rrVeteran

St.Cloud,Florida

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How I was taught
I was told and it works for me. Do not set it up in normal as you will never fly in normal, that was the reason in spending so much for this gyro. Just set it up in heading hold so you can set limits at 120 or more on both sides with no binding. Dont worry about where it is in center as gyro will put it where it needs to be when you are hovering. I use end points at 135.

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12-12-2004 09:42 AM  13 years agoPost 5
MAX NITRO

rrApprentice

Armadale Western Australia

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Im not running the 601 in normal mode, im using normal mode to set limits and centre point so there is no drift, when you put it in avcs mode for the rest of its life the fundamentals are set.

If you set the gyro with equal limits on the bench the tail will drift as there is no pitch on the blades so the tail push rod needs to be adjusted until it stops drifting. Once you do this the limits that you have initially set on the bench are now incorrect.

Is it ok to have the limits for A & B to be different values within 20%?

Cheers

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12-12-2004 06:52 PM  13 years agoPost 6
Drunk Monk

rrProfessor

Preston, UK

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If you set the gyro with equal limits on the bench the tail will drift as there is no pitch on the blades
It will drift if you fly like that in normal mode. As soon as switch to HH hold, the gyro will sense drift and realise there isn't any rudder input and stop the drift. I don't know anybody who flies a 601 in normal mode, no point.

If you set the gyro up the way you are talking about then it is easily possible to get the limits set to 120% as on JK's site, just move the ball in and recheck the limits. Then you can fly in normal mode, adjust the rod length, recheck the limits and your set up. The problem here is that you won't be using all the travel on the rudder, like jerry says, so depending on your level of flying this may or may not be an issue. If your into fast backwards or backwards inverted flight then you will need every degree of pitch you can get on the rudder.

Mine is set the same as jerry's, 120% both ways and all the travel I can get and it works very well


Stephen

I only open my mouth to change feet.....

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12-13-2004 07:20 AM  13 years agoPost 7
gnichola

rrApprentice

Santa Rosa, CA. USA

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Dont worry about where it is in center as gyro will put it where it needs to be when you are hovering
I have to take exception to this. In my experience, if you don't set normal to hover properly with a good mechanical mix the gryo just doesn't perform well.

I am a software engineer by trade and it is my belief that the algorithm the gryo uses is not simply a, "move the servo farther if I am still not where I am supposed to be" kindof algorithm. I am pretty sure it much more complicated than that, and probably includes information like, "how far from neutral am I".

In actual experience I have re-mounted the tail after a crash and just blew off the mechanical adjustment (other than checking endpoints), and when I went to fly it just wasn't right. I brought it down, put it into normal and adjusted my linkage until it hovered straight, and when I took her back up and put her through her paces again, it flew much better.

My .02 as to a procedure is:
1. Hover in normal, at your normal head speed and mechanically adjust for a straight hover.
2. Adjust your endpoints so that you max the throw without binding, in both directions, forget whether one is higher than the other.

Regards, Guy

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12-20-2004 02:03 AM  13 years agoPost 8
AndyH

rrKey Veteran

Rockledge, FL

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Sorry gnichola,

But, centered with zero pitch holds just fine!

Backwards, tail slides, you name it I've never had a problem. The gyro will put the required input necessary to keep the tail put. Also, like others said, when are you ever going to fly out of HH - and if you want to for some weird reason than yes you have to set it up with some offsett.

601's rock!

This hobby is like Kryptonite to chicks!

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12-20-2004 09:20 AM  13 years agoPost 9
davehour

rrElite Veteran

Guayama, Puerto Rico 00785

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Hi:

What I do to be able to use the full mechanical travel of the tail rotor mechanism and still be able to have the tail trimmed in normal mode is, I use the maximum rod mechanical adjustment possible to trim the tail in hover (i.e., to add pitch to the tail blades) that still me use the full mechanical travel on both sides. Then, I use sub-trim until the tail is trimmed in normal mode. Reset the gyro, and then you'll have both modes under control, full mechanical travel use. Please, note the gyro end points won't be equal. Besides, the servo horn won't be at 90 degrees neither in normal mode. Mines are 145-138. The heli is an Evo 50.

Thank you very much.

David

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12-20-2004 07:55 PM  13 years agoPost 10
gnichola

rrApprentice

Santa Rosa, CA. USA

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Sorry gnichola,

But, centered with zero pitch holds just fine!
This has definitely not been my finding, but to each his own.

Regards, Guy

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