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HelicopterMain Discussion › Throttle servo setup... uggg!
06-08-2012 02:49 AM  5 years agoPost 21
marc8090

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Long Island, N.Y.

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My linkage is EXACTLY the right length and my servo arm and carb arm are EXACTLY 90 degrees to the linkage with the barrel at the half way tick mark. I can guarantee that starting with this my endpoints will NOT be the same top and bottom to get full open and full closed. I've been doing it this way for many years with no issues.

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06-08-2012 02:52 AM  5 years agoPost 22
McKrackin

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Lucasville,Ohio

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Do you raise the trim when you set the high end point?
Guessing no...Most don't.

From center...you have -100% travel and -50% trim to fully closed.

Now when you go from center to fully open,you need +100% travel and +50% trim.

When it's shut off,it has -50% trim.
When it's flying,it has +50% trim so set it up with the +50% trim.

I literally never use the word literally right.

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06-08-2012 06:29 AM  5 years agoPost 23
GetToDaChopper

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Las Vegas , NV

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what's a throttle ? is it the thing with the three large wires coming out of it that go to the motor ?

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06-08-2012 07:22 AM  5 years agoPost 24
YSRRider

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usa

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Here's a hint: Set up your throttle linkage with the carb arm screw LOOSE. With the throttle stick fully raised, manually open the carb to the most open position, and tighten down the screw. Simple!!
This is the most intelligent hint I have read on here since I stopped posting back in 2006!

Thank Dood!

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06-08-2012 12:25 PM  5 years agoPost 25
marc8090

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Long Island, N.Y.

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If you're using a Futaba radio with digital trims then the trim has no effect on full stick. It only works at lower stick positions.

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06-08-2012 03:06 PM  5 years agoPost 26
McKrackin

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Lucasville,Ohio

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If you're using a Futaba radio with digital trims then the trim has no effect on full stick. It only works at lower stick positions.
Seems unlikely.

If you push the stick to the full throw limit and hold it while applying trim...the servo doesn't move?

I'd like to see a video of that.

Adding trim with the stick anywhere adjusts the servo.

Try it...Stop your stick just short of wide open with 0 trim...Now move the trim to 50%...the servo will advance.

Adjust low end point with 0 trim.
Adjust high end point with 50% trim.

It's the way it's done.
You want the trim to be where it's going to be while running when you set high end points.

I literally never use the word literally right.

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06-08-2012 03:11 PM  5 years agoPost 27
GetToDaChopper

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Las Vegas , NV

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that sounds right to me.....

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06-09-2012 12:54 AM  5 years agoPost 28
marc8090

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Long Island, N.Y.

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What sounds right? Futaba radios have what is called ATL. On the older radios you had to activate it. On newer radios with digital trims it's always on (unless you inhibit it). What it does is inhibit the trim above a centain stick position so that adjusting your trim for idle speed does not affect full throttle. If you've never used a Futaba radio then I could see where you would doubt this, but that's the way it is. I'm not going to make a video to prove it. Do you really think Futaba would be stupid enough to let trim affect full throttle? So if you happened to raise your trim a few clicks now you'd be flying around binding every time you went full throttle? I don't think so.

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06-09-2012 01:56 AM  5 years agoPost 29
heli-cuzz

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Pittston, Pa. USA

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What sounds right? Futaba radios have what is called ATL. On the older radios you had to activate it. On newer radios with digital trims it's always on (unless you inhibit it). What it does is inhibit the trim above a centain stick position so that adjusting your trim for idle speed does not affect full throttle. If you've never used a Futaba radio then I could see where you would doubt this, but that's the way it is. I'm not going to make a video to prove it. Do you really think Futaba would be stupid enough to let trim affect full throttle? So if you happened to raise your trim a few clicks now you'd be flying around binding every time you went full throttle? I don't think so.
+1

I was gonna chime in on the Futaba trim.
I believe my 8fg trim is deactivated after 25% throttle when the governor is activated at 25% throttle.
.

Fury 55 NIB Furion6 CGY750 fbl helicopter-Frenzy CGY750 fbl nitro-Frenzy fbl NOBAR90

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06-11-2012 12:10 AM  5 years agoPost 30
McKrackin

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Lucasville,Ohio

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Do you really think Futaba would be stupid enough to let trim affect full throttle? So if you happened to raise your trim a few clicks now you'd be flying around binding every time you went full throttle? I don't think so.
I see what you guys are saying now but still...how would that make Futaba stupid?

If trim works at full throttle,you'd have to be smart enough to set up a radio right.
Futaba just dumbed the process down a little.

Pretty cool but un-needed.

I literally never use the word literally right.

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06-11-2012 01:03 AM  5 years agoPost 31
McKrackin

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Lucasville,Ohio

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It also might explain how JR has equal end points and Futaba doesn't.

How about other Futaba guys? You can't get equal end points on your throttle?

I literally never use the word literally right.

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06-11-2012 01:51 AM  5 years agoPost 32
rexxigpilot

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Florida

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All mine are alomst exactly even endpoints using Futaba (within 2%). Dood already did a great job of explaining how to setup the throttle. You start your throttle linakge setup with the trim all the way down on a Futaba radio. Set the link lengths to be exactly the distance between the screws on the throttle arm and servo wheel. I even screw down the link between these points to make sure it is the correct length whether using PP or single link. The next step is too choose the correct holes for the link balls to get the needed minium and maximum throw (with throttle trim all the way down) so that the carb barrel opens and closes fully. I typically have the balls on both set to the same distance out from the center.

You don't need exactly ±100 Endpoints/ATVs. If you have say -90 and +90 it will be OK (anything less should be adjusted IMO). You will lose a bit of throttle resolution if not at 100, but you won't notice and I doubt your governor will either.

After the throttle link is set to even enpoints, raising the throttle trim to 0 usually gets you very close to perfect low throttle position.

McKrackin had a good tip on the adding the Enpoints/AVTs and dividing by two to know where the average of the two will be for full throw. If you are not close to 100 average you need to adjust the ball positions.

One other thing about digital trims. Many newer TXs have the ability to have the throttle (and other) trims affect the entire range or just the low stick.

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06-11-2012 02:01 AM  5 years agoPost 33
unclejane

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santa fe, NM, USA

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Yeah Futaba has had the ATV (Adjustable Travel Volume or Limit) basically forever, ever since they started making computer radios. Basically the throttle trim stops having any effect around 25% throttle or thereabouts.

It's just a different way of doing things, I believe JR's throttle trim works in the normal way with full effects at all parts of the range.

My endpoints are unequal on my 700N and I think it's a combination of I didn't set it up completely right and because of the ATV. I 90'ed everything at half stick, went to full and adjusted the endpoints till it quit binding. Tightened the nut on the throttel barrel and then repeated at the bottom end. I fudged it with the trim and then left it alone because it worked and I was tired lol.

But I think the ATV generally leads to different endpoints, depending on where your preferred idle is on the trim. Some guys try to get idle right at 0, but I'm not that anal. My 700N idles at something like -40 on the throttle trim. My reasoning is, or at least my excuse is, , I can't accidentally trim the throttle so high to engage the clutch and possibly create a situation.

So again I messed something up during setup but it works fine and I've just left it alone ever since. But the ATV does give you non-equal ranges from full to low stick on the throttle on the Futaba....

LS

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06-11-2012 02:04 PM  5 years agoPost 34
rballz

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Springfield, MO - USA

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This thread has good timing, I'm going through my first nitro heli setup on a Synergy N5C.

I set everything 90, half stick ends up on the middle of the 3 mid marks (YS 56), high is at the high mark, and low is a few mm off the low/closed mark.

I did all this on a 8FG with trim at 0 I wonder if I should re-do it or just ride it out and have a high idle trim.

Thoughts?

Synergy N5c | MA Furion 6 | MSH Protos

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06-11-2012 07:44 PM  5 years agoPost 35
rexxigpilot

rrProfessor

Florida

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I'm thinking you will be OK as it is provided you get sufficient adjustability onm the idle. If you set the trim all the way down, does it bind? Move the Endpoint until it bionds with full trim than back off a point or two. What are your Endpoint values under this condition?

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06-12-2012 06:19 PM  5 years agoPost 36
rballz

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Springfield, MO - USA

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Sorry to hijack your thread punkin, good info here.

Re-did mine, first off this is a YS-56. Do I set half stick at the 40% mark (no 50) or just get full range 0-100? That's what I have now and half stick is a bit ahead of the 40% marks.

With trims all the way down I get a little binding low.

I want to maiden today and could post 0-50-100 pics?

Synergy N5c | MA Furion 6 | MSH Protos

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06-12-2012 06:41 PM  5 years agoPost 37
jschenck

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La Vista, NE.

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06-12-2012 07:33 PM  5 years agoPost 38
Big Edge

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Oldsmar, FL USA

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On Futaba I never setup throttle with trim all the way down.. this creates differential throws. (Trim centered)
I use trim to control idle speed and setup "throttle cut" to kill the engine. Use just enough Cut to kill engine and not bind the servo.

Makes setup easier for ME.

YMMV.

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Don't taze me bro...

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06-12-2012 07:36 PM  5 years agoPost 39
rballz

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Springfield, MO - USA

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I'll try trim centered as well. I'm on a 8FG and cut with SH (momentary switch).

Synergy N5c | MA Furion 6 | MSH Protos

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06-12-2012 09:38 PM  5 years agoPost 40
mike4406

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tampa fl

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I also disable the throttle trim for IDLE 1 and 2 to ensure I never bind the throttle servo accidently. The instructions for doing this are on page 61 in the 8FG manual. You need to have the "X" displayed in the function menu to ensure your throttle trim is disabled in IDLE 1 and 2.

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HelicopterMain Discussion › Throttle servo setup... uggg!
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