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HelicopterEngines Plugs Mufflers Fuel › OS 50/R50 throttle ATV's
03-14-2003 03:03 AM  14 years agoPost 1
robb

rrApprentice

Vienna, MO

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Hi! I just installed a new OS50 in my R50 heli, which took place of my TT50. I just got done reading Ray's manual that says throttle ATV's should be between 50 and 70%...is this correct? I thought we try to get as close as 100% as can be.

Any insight on this? At 50% throttle, both servo arm and throttle arm are at 90 degrees, but had to reduce my ATV's from 92% to 69%. This doesnt sound right. Any ideas or comments?

Thanks,
Rob

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03-14-2003 04:38 AM  14 years agoPost 2
Gearhead

rrMaster

Vt

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on my 8103 I had my throttle and pitch set around the low 80s, and my 2 curves were set at 100% full stick and 0% at low stick, but my book that came with my Tx reads that the ATV are set at 100% at the factory, so I raised them to 100% and reset my throttle and pitch curves and my climed-out increase quit noticeably !!


Jim

Jim
Buzz Buzz Buzz

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03-14-2003 05:14 AM  14 years agoPost 3
vitek

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Corvallis, OR

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The ATV should have no effect on the throttle and servo arms at 50% throttle. ATV only effects the servo end points.

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03-14-2003 05:30 AM  14 years agoPost 4
vitek

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Corvallis, OR

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Lowering the ATV on the throttle decreases the angle that the servo arm rotates. This, when combined with a longer servo arm, effectively increases the speed and decreases the precision of the throttle servo.

Some people believe that you will get better performance if the throttle reaches a given point before the collective. This is what you get when you lower the ATV and put on a longer servo arm.

I can post or e-mail a procedure for setting up the throttle linkage if you'd like.

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03-14-2003 01:12 PM  14 years agoPost 5
robb

rrApprentice

Vienna, MO

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Well, at hover, I have both arms pointed straight down and at 90 degrees, but I can't bump up my ATV's as that throws off my linkage size, which will then mess up my 90 degree hover point. Something isn't right...I just can't pinpoint it.

Thanks,
Rob

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03-14-2003 04:13 PM  14 years agoPost 6
vitek

rrKey Veteran

Corvallis, OR

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Straight down at 90°?

When we say 90°, are talking about the angle between the pushrod and servo arm as well as between the pushrod and throttle arm on the carb.

The only way that you can have 90° when both arms are pointed straight down is if the servo and the carb are at the same height.

I don't have a raptor anymore, but here is a pic of the throttle linkage on my fury at 50% throttle.

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03-14-2003 04:29 PM  14 years agoPost 7
MJA

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UK

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Rob,
At the OS50 carb use the hole on the plastic arm
furthest out,with Futaba gear (tx/rx/servo)
that normally gives an ATV of about 90% with a servo arm length of about 12-14mm.There isn't too much benefit from trying to achieve
a mechanical linkage setup to give 50-60% ATV unless there is already a big speed difference in the collective and throttle servo's.
IMO i believe it's better to put a faster servo on the throttle to match the collective.
.
Using low ATV and long arm setup,the servo will gain some speed,also some torque(which isn't needed for the throttle ),lose precision.The downsides are it will make the hovering throttle control on the tx and also the throttle pitch curve points very coarse.
There is no textbook ideal ATV for the throttle as the throw range and arm lengths on various carburettors varies from make to make.

Making equal adjustments to both throttle throw ATV's shouldn't throw out the mid range setting as long as you re-adjust the link length & move the ball in or out on the arms.What will throw it out is if your radio has the throttle trim set for the whole range instead of from half stick down only.On lower end Futaba computer sets it's usually an option called ATL (auto trim limiter) and on the 9Z (ATL-S or C) and not NOR -S or C.


Martin

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