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HelicopterRadio - Servo - Gyro - Gov - Batt › Vision 2000 HH Gyro - help needed, please
10-21-2004 03:38 PM  13 years agoPost 1
T.W.

rrNovice

Northern UK

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I bought a used Vision 2000 HH gyro and just did a bench test on it. I didn't get any instructions so connected it in-between Rx channel 4 socket and a spare servo. There's an auxilary cable too, so assuming this is used to switch the HH function on and off, I connected it to Rx Channel 5

I did some fiddling (erm, I mean "testing") and I'm now a bit puzzled (not that this is anything new mind you ). The first thing I notice is that the gyro takes what seems like a long time to initialise. I checked it and the time varies from 15 to 22 seconds. Is this right?

The gyro seems to work ok in normal mode, but I'm wondering if there's something wrong with the HH function as, when I leave the rudder stick in the centre and switch to HH mode, the servo moves, very slowly, until it reaches full deflection. I found that I can fix this if I adjust the trim just a couple of clicks, but another click sees the servo move very slowly to full deflection in the other direction. Is this "normal?"

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10-21-2004 05:04 PM  13 years agoPost 2
blockatvalpo

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Reston, VA

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Not sure if it is like the 401, but you should set it up in non-hh and then switch over to hh. Eyeball the tail blades to make sure they are straight. You won't know till you fly it. Start it up in hh and then switch over to non-hh. You can't go non-hh to hh. With the 401 if you touch the trim you will make it go to the extreme. You can't use trim with a hh gyro. Hope that helps you out.

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10-21-2004 06:22 PM  13 years agoPost 3
fritzthecat

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Virginia Beach, VA

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Actually the basic HH gyros need trim to find the center/no movement position. The 401/502/601 do this automatically.
Instead of using the trim button to stop the servo from moving in HH mode, go to the subtrim menu and adjust the trim there for no servo creep. If you have a radio with digital trims, you can also set the trim step to one for a finer resolution of the trim button.
Once you have it trimmed for no movement in HH, fly in Norm mode and adjust the taillinkage for no yaw.
Check the HH mode before each flight to see if temperature differences made the HH mode go out of trim. Adjust as required each time with trim/subtrim.

Fritz


'Send Money, Women and Guns!'

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10-21-2004 06:36 PM  13 years agoPost 4
nivlek

rrProfessor

Norfolk England

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The RC Vision gyro does take around twenty seconds to initialise.If you set it up the same as the CSM ICG360 gyro it will work fine.You should be able to find the ICG360 instructions to download.Personally
I just set the gain to 60% in both normal and HH.Trim the heli out in HH mode on the tx, then adjust the length of the tail rotor control rod to stop any rotation in normal mode. Then adjust the travel on the rudder channel on the tx to get the desired rate of rotation, finaly adjust the gain of the gyro if required.

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10-21-2004 11:04 PM  13 years agoPost 5
T.W.

rrNovice

Northern UK

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Thanks for this guys, you've been a great help. I actually thought I'd bought a broken gyro, but reading what you said it looks as though it's going to be ok

I'm using a Furaba FF8 Tx so will be able to do as you suggest. I'll give it a go tomorrow and report back with my results then

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10-22-2004 12:10 AM  13 years agoPost 6
T.W.

rrNovice

Northern UK

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Even though it's past midnight here, I "just couldn't wait" to try what you advised, so . . . . I reset the trim increment down to "1" - but I can't see a way to set "no servo creep" on my FF8. Guess this is something I'll have to pass on.

Setting the "center/no movement position" in HH model is really critical as one click in either direction gets the servo moving again. Is this "right?"

I didn't know this: "You can't use trim with a hh gyro;" or that I had to do this: "adjust the tail linkage for no yaw." So I really have to remember not to use the rudder trim if the heli needs a yaw correction - wow, glad you told me this! I'm learning all the time tonight!

Thanks again guys. Can't wait to get the gyro installed in my heli now

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10-22-2004 01:28 AM  13 years agoPost 7
fritzthecat

rrKey Veteran

Virginia Beach, VA

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Actually with the old HH gyros (like your 2000) you CAN use trim while flying.

Here is my old webpage about setting up a CSM:
http://fritzthecat.250free.com/csmsetup.html

Sometimes the temp change/vibrations when hovering make the HH center move a little.
Don't do this with the new generation 401/502/601 gyros. They work differently.

Fritz


'Send Money, Women and Guns!'

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10-22-2004 01:57 AM  13 years agoPost 8
baby_zyklon

rrElite Veteran

Singapore

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I have a vision2000, you have to use trim to make it work in heading hold mode, but after you give it some trim you have to switch it off and on again for the trim to take effect in flight. Juz fly in hh mode all the time. Ignore the manual about using trim till the servo doesn't move in hh on the ground, it will change almost every other flight, so no point in fighting it...if you are intending to fly in normal mode also, then use revo, so that you don't affect the trim in hh. You CAN use revo for this gyro in normal mode.

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10-22-2004 09:33 AM  13 years agoPost 9
T.W.

rrNovice

Northern UK

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Thanks again guys, you've been a great help. I'm busy right now but I'll do as you say just as soon as I get the time

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10-22-2004 01:33 PM  13 years agoPost 10
T.W.

rrNovice

Northern UK

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Just in case anyone else needs the set-up instruction for this gyro I just found them here: http://data.robbe-online.net/robbe_pdf/P1122_1-8065.pdf

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10-25-2004 06:31 PM  13 years agoPost 11
T.W.

rrNovice

Northern UK

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Feedback: Thanks to your kind help I had a successful hovering session this afternoon. I had to reverse the gyro, but after doing that it worked great in normal and HH mode without having to do any trimming at all. I'm delighted with my "cheapo gyro." Thanks again guys

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HelicopterRadio - Servo - Gyro - Gov - Batt › Vision 2000 HH Gyro - help needed, please
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