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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Some GY401 and Sceadu50 questions
07-17-2002 03:41 PM  16 years agoPost 1
ncarbon

rrApprentice

Kalispell Montana

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On the 9253 servo, to get the servo armat 90 degrees I had to adjust the trim in my 10SXII. So the arm is at 90 and I go into 'trim offset, code 82' and 'set' rudder so the trim lever can be centered and the servo arm stays at 90 degrees. I watch the servo and have equal throw and adjust the GY401 servo limit pot until I am close on both directions.
I then have the tail pitch arm set at a 90 degrees also. With the stock Sceadu50 blades I would have to trim over to the right quite a bit, so I would have only alittle throw to the right (pitch slider moving out towards tail bldes) and tons of available left(pitch slider towards tail
boom) so when in normal mode the hover is centered. I didn't like this
so I put the Freya tail blades on and the pitch slider was closer to mechanical centered......what am I doing wrong or any suggestions.


TIA Ned

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07-17-2002 04:49 PM  16 years agoPost 2
vetrider

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Daleville, AL (Ft.Rucker)

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cnsheets has the right idea but instead of doing the wheel and rods adjusting thing just get the arm centered and slide the servo mount on the tail boom to get the heli hovering good in non-HH (Normal) mode with trims neutral. But,....then again why have trims and Sub-trims adjustment anyway if ya not going to use them?


Also...The 401 can be made to memorize the trim setting from the Normal mode to the HH mode by getting the heli hover trimed in Normal mode, landing and then flipping your transmitters HH selection SW on your radio 3 times within one second stopping in HH mode. The Gyro will then know this as default trim setting.

Nolan

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07-17-2002 05:07 PM  16 years agoPost 3
jeffscholl

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Whitefish, MT

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hi ned...another beautiful day in paradise....

vetrider and cnsheets,

Are you using stock Sceadu tail blades?
If so, do you feel they have adequate thrust for aggressive backwards flight? (headspeed ~1800)

Cheers.....

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07-17-2002 05:39 PM  16 years agoPost 4
ncarbon

rrApprentice

Kalispell Montana

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Appreciate all input
Hey Jeff, another great day of 'Customer' relations going on here!!!!
I wish I could skip and just fly today. In backwards flight is when the break out was happening. My thought was now I am mechanically centered, 90 degrees with servo arm(using offset) and 90 degrees at the tail pitch slider......I would flight trim in Normal using subtrim in my radio, them memorize the 'centering' in the 401......I am willing to try
different tail blades, but not sure what you heavy 3Der's are using that works well. Right now I have Jeff's old Freya blades on my Sceadu50!!


Ned

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07-17-2002 05:43 PM  16 years agoPost 5
JSaleska

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Navarre FL

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In my opinion the stock Sceadu Tail blades weren't designed for the 50. There just isn't enough surface area to keep the tail solid in fast backwards flight. The blades do and will stall if you get the heli even a little out of alignment. When they stall you will get the "Tail Blowout" and the heli will just flip around to forward flight. I've been using the stock Freya tail blades and they work great. I've also switched the tail grips to the Freya 3 ball bearing ones to remove some of the slop when she's on the ground. I really don't think the last mod did much, but now I have parts compatability between the sceadu and freya on certain things. hehe AT least that was my justification.

Jon Sends
Team Mastercard
RC Helis Are 35% MX, 50% BS, & 15% FLY

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07-17-2002 10:17 PM  16 years agoPost 6
vetrider

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Daleville, AL (Ft.Rucker)

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Nope .....No Stock skiddy blades on mine. I use the stock Freya plastic blades.
They work great and Kam Wyatt gave it a ringing out in backward flight last weekend. No blow outs!

Nolan

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07-18-2002 03:32 PM  16 years agoPost 7
Maxx

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Shreveport Louisana

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Concept50vr, I don't ever worry about having equal T/R slider throw on any helicopter! If you set the T/R blades to a rough hover position ( say 5-7 degrees) and set the servo wheel/arm to the 90 degree position at center stich position. Then set the pot on top to limit the throw so the servo won't bind in either direction. Trim the heli with the ball links in the non-HH mode and input this as your center position in the 401 with the 3 switch thing. Set the gain ATV just short of a tail wag and use the T/R (rudder) travel atv to get the piro rate you want...on all three Scoobies I have set up (w/stock T/R blades!) you can get both a left or right piro that is a blur!!! If you think about it, bench setting the pushrod 90 to the servo with the T/R blades flat does nothing...when you hover the first time you crank in sub trim to put hover pitch into the radio you've now got the correct T/R blade angle but your servo is offset (to right T/R ) and you have subtrim in the radio. The way the 401/502/601 series works seems to be like this: Set you throw to max allowable on the pitch slider to the shortest side and use the Rudder ATV to increase "Stick Priority" of the gyro to give a faster piro rate without actually increasing the T/R throw! Just my $.02 (Confederate Money)

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07-18-2002 03:41 PM  16 years agoPost 8
ncarbon

rrApprentice

Kalispell Montana

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Alittle experimenting.....
I will try a few different methods to see which feels the best to me. Right now the centered method required subtrim of 35 in my 10SXII. Seams to fly OK.........my gain is at 80 in HH. When I am flying fast backwards the tail yaws just slightly but holds...I have the Freya blades on right now.

Ned

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07-18-2002 09:51 PM  16 years agoPost 9
MRC-Hirobo

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Edison, NJ

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401 OR 601
hey dudes,

Early on with the 401, Hirobo suggested using the 601 for harder aerobatics as I too had problems with the 401 not holding in ripping backwards flight. I tried their suggestion and it worked for the time. Then we went to the Freya tail pinion gear and that worked well too. Some guys are also using the Freya tail blades as some have mentioned in this post.

When I was using the 401, Steve Helms told me to go to the 16mm setting to make it work and that improved it as well. At the Jamboree i had some blowing out, but later found that the bell had rubbed into gyro cord. Once that was fixed, the problem went away.

I have started up another 50 with a 401 and will go it step by step like I did a year ago. But for right now the two fixes that are holding are to use the Freya tail rotor blades and/or use the 18T 0414119 tail drive pulley.

What I am missing is that the problems seems to happen with the 401 and not the 601 or not as readily. Maybe the tail is ineffcient and too much so for the 401 but the 601 is that much better to catch it. I can feel a difference between the two but that is what you are paying for.

I think the answer is there, and it is not an expensive or long term fix.

Jeff G

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