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HelicopterGasser Model RC HelicoptersOther › Gasser Throttle Linkage Setup
03-16-2009 05:57 PM  8 years agoPost 141
AceBird

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Utica, NY USA

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If I'm not mistaken Carey is sponsored by Futaba
Chris, what does that mean exactly? Is that like you being sponsored by Bergen, so no matter what you say it must be true? Any engineer worth his salt would not be run off by anyone on this forum. More than likely they would be censored by their own sales force. I never met an an engineer that would be afraid to discuss how something works (assuming they are not also a salesman).

Ace
What could be more fun?

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03-16-2009 08:51 PM  8 years agoPost 142
Chris Bergen

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cassopolis, MI USA

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Uhh, That means that Carey Shurely is a Futaba Sponsored Pilot, maybe only a rep, but Im pretty sure I've seen him wear an Orange Shirt!!

Just replying to the question...
Wouldn't it be cool if the manufacturers reps that actually know how these really work told us how they work instead of us wondering?
Is that like you being sponsored by Bergen, so no matter what you say it must be true?
As it pertains to Bergen Products? YES!! Or maybe you suspect I'm lying on how to set up or maintain or use my helicopters....??

Chris D. Bergen

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03-16-2009 10:09 PM  8 years agoPost 143
Doug Darby

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Dallas, Texas

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What I find interesting is that there are several individuals on this thread (like me) that have come into the gasser world recently knowning very little (nothing in my case) about gassers, let alone mechanical expo on Throttle linkage and the nuances of how it is handled by the GV-1. But we have set our machines up as recommended by some of these knowledgable people and they perform just great. In our cases "we didn't know what we didn't know" but have ended up with great performance. I think Chris's comment that "there's a tip in there somewhere..." is very appropriate..

doug

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07-06-2009 01:17 AM  8 years agoPost 144
BeltFedBrowning

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Kansas City

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With all the gasser popularity this thread deserves a bump. Lots of good info here.

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07-06-2009 10:04 AM  8 years agoPost 145
Paul-PJH

rrApprentice

The Netherlands

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Hi,

I tested my Spectra-G yesterday with the mechanical expo settings. The behaviour in spooling up was much smoother now so I am very pleased. The gas-curve is much more like a nitro now.

Grtz,

Paul

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08-13-2010 07:14 AM  7 years agoPost 146
Malc1

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EVESHAM,UK

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Sorry to re start an old thread but I have trying to set this up on my Spectra G and am having a problem with it

I have posted also in a thread of my own but not with so much detail

I have decided to try this method to reduce overspeeding of the head when the rotor disc is unloaded.

Linkage has been changed to give the slower movement near to closed throttle and the ATVs are pretty even to each other,adjusted to give throttle shut down and full opening of the valve.

As recommended I reset my throttle curve to a linear 0,25,50,75,100 expecting this to just work.

In the back garden I managed to adjust the throttle trim to about 36 clicks to get the engine to idle OK.

The mixture settings were not touched.

So far so good, so off I went down to the field.

I spooled the heli up and within a short time realised that the head speed was far too high so I then started to play with the throttle curve.

After several hoving attempts at different throttle curve settings it started to appear to me that the curve was getting to look a bit like the old one.
You know starting at 0 and having a a more or less straight quite low down line (0,12,20,21.5,21.5,22.5,100) - this worked

After various attempts to hover the heli with the engine sounding and feeling some where near I starting to have running problems.

Had these before and had a vision of the issues I had some time back when I first set the gasser up.

Anyway ended up with the engine running unevenly in the hover and when the heli was put down being unable to shut the throttle down even with the trim.

The same symptoms as an air leak in the system I had the heli sat on the ground with the engine running on and quite high revs with out being able to shut it down.

In the end it would start to slow down and then you would have the surging/pulsing effect,then after a few seconds with the trim down the engine would then cut out.

The engine felt hot.

I attempted to restart the engine and slighty richened the low needle

It started,just about ended up running, but just sat there pulsing and surging for probably 30 seconds then it would cut out.

At this I decided to call it a day and come home.

What I have done since getting home is pull the carb off and retighten the usual fixing screws - just in case air is getting in there.

Any one point me in the right direction again?

I need,I think information on how the throttle curve needs to be to get this to work.
Just hoping that I haven`t knackered the engine while initially hovering with this new linkage setup.

Just wondering whether or not to just put it back as it was and put up with the over speeding.

Minicopter Diabolo - Kosmik200,Pyro750-56
SpectraG + G26 3D Max

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08-13-2010 09:59 AM  7 years agoPost 147
shawmcky

rrElite Veteran

Isle of Wight,United​Kingdom

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I would put the curve and linkage back to​your previous setting

Sounds like you were close before Malc.Overrevving your motor wont do it any good,if your senses tell you it is wrong dont ignore them.Remember every time you alter the throttle curve you must reset the points in your GV1 also.

Team- unbiased opinion.K.I.S.S principle upheld here

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08-13-2010 11:16 AM  7 years agoPost 148
Malc1

rrKey Veteran

EVESHAM,UK

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Yeah thats what a little voice in the back off my head is telling me to do

Also though the thought of sorting out the overspeeding and the odd hiccup is making just sit with it and not just rush out and change it all back.

You are right about the motor though - what I don`t want to do is trash it especially when it has been running so well.

Hope its alright when I come to see if it runs ok later on today.

Thinking about it, yesterday maybe I oversped the engine a couple of times while initially hovering,heated the engine up a bit too much and for some reason started having a problem with air getting back into the system via the gaskets on the isolator block.

I have retightened both sets of bolts at the carb.

If the engine runs later one more try maybe before I put it all back to how it was.

Regarding the different linkage arrangement any idea approximately what the throttle curve should look like?

Are we trying to still achieve a gradual slope of a curve or more of a flat line like the standard set up?

Can the 100% throttle point be reduced if required?

Just looking for some more info.

Minicopter Diabolo - Kosmik200,Pyro750-56
SpectraG + G26 3D Max

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08-13-2010 12:38 PM  7 years agoPost 149
shawmcky

rrElite Veteran

Isle of Wight,United​Kingdom

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Over time Malc

you will learn to rely less on what the numbers say on the curve,these are only a guide and not set in stone.If you learn to listen to the motor and get a nice transition of pitch and power by making adjustments till it sounds smooth without bogging this is the aim,the numbers in the transmitter are not so important as long as you achieve this.What is good on one helicopter set up will not always be the same on the other.Your first and original set up must have been very close with your linkage set as before.

Team- unbiased opinion.K.I.S.S principle upheld here

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08-13-2010 12:46 PM  7 years agoPost 150
AceBird

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Utica, NY USA

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Pulsation has nothing to do with a curve. If it was set right to begin with it will always be right. You are describing an air leak condition or a leaning condition. If this was a result that occurred without touching the needles than it is either a fuel starvation issue or an air leak.

Ace
What could be more fun?

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08-13-2010 01:00 PM  7 years agoPost 151
Malc1

rrKey Veteran

EVESHAM,UK

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Yeah I think that the rough running and airleak symptons has nothing to do with setting this up.

Its just that I have all of a sudden got an engine problem while trying to change things.

Obviously I have done something wrong here which I suspect now may be too high a throttle curve at the start yesterday leading to overspeeding of the engine - and getting it hot.

I am going to stay with it for one more try and am going to reduce it down to see what happens - as long as I can start the engine when I get back in later.

Just got to work out a starting point.

Minicopter Diabolo - Kosmik200,Pyro750-56
SpectraG + G26 3D Max

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08-13-2010 02:24 PM  7 years agoPost 152
pgkevet

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Wales

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Regarding the different linkage arrangement any idea approximately what the throttle curve should look like?
I found that a malorie linkage setup didn't give me anything like the suggested straight curve either. Mine is currently 'an almost malorie linkage that i compromised by a spline or two on the servo horn'.. and runs on very low numbers.
idle down 0, 6, 8, 11.5, 16, 20, 23.5, 33, 100
idle 1 100, 37, 30, 24, 18.5, 24, 30, 37, 100

That's with 110:111 endpoints and idle trim halfway on the trim control on my FG12. on the servo output monitor +130 is the least throttle and idle trim makes that +111. Midstick makes it +75 in idle down and +69 in idle up.

Curves and numbers actually being given out by the tx aren't always the same.. pots wear and internal maths may be slightly different too. Output range here is +130 to -110

If I move the servo horn one spline (and redo link length etc) those numbers change by a lot

pgk

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08-13-2010 05:53 PM  7 years agoPost 153
AceBird

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Utica, NY USA

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Obviously I have done something wrong here which I suspect now may be too high a throttle curve at the start yesterday leading to overspeeding of the engine - and getting it hot.
Getting it hot could mean that you won't get it back were it was. It may be a dumb question but if it was running so good why did you mess with it?

Ace
What could be more fun?

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08-13-2010 06:00 PM  7 years agoPost 154
Malc1

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EVESHAM,UK

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I`m begining to regret touching it
Thought that I could get it better with regard to the over speeding that I have had since it was set up.
Was hoping to cure the hicupping as well.

Minicopter Diabolo - Kosmik200,Pyro750-56
SpectraG + G26 3D Max

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08-13-2010 06:40 PM  7 years agoPost 155
AceBird

rrElite Veteran

Utica, NY USA

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This is a SWAG (silly wild arse guess).

You were on the ragged edge of lean and though it was running fine. A curve or linkage adjustment put it over the edge and got it hot. Once that happens it could have scored the piston gummed up the ring or warped something causeing an air leak.

The rule of thumb that I live by is:
If you make an adjustment and it doesn't improve than put it back where it was BEFORE you adjust something else.
Hicups are not usually caused by curve adjustments they are usually solved by mixture adjustments.

It may be too late but I would try to get everything back to where it was. When you mess around with programming always copy to another model and mess with that so you can always go back to the original.

I hope you can get it sorted.

Ace
What could be more fun?

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08-13-2010 07:13 PM  7 years agoPost 156
Malc1

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EVESHAM,UK

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Good news is at stock mixture settings 1 1/4 low and 1 1/2 high (which is somewhere near to what it was anyway)it runs OK.

Started 1st pull as well.

Good news for now but I have ended up stripping the grub screw out of the carb throttle arm.

Grounded from any more tests for now.

Minicopter Diabolo - Kosmik200,Pyro750-56
SpectraG + G26 3D Max

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08-14-2010 01:16 PM  7 years agoPost 157
AceBird

rrElite Veteran

Utica, NY USA

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These settings would normally be on the rich side for a broken in engine. I have to go back to what I said before. Somehow it got a fuel starvation or an air leak condition to create the pulsations that you have now.

Also note that a rich running motor that overheats can gum up the works. Maybe a bearing seal got compromised (still guessing).

Ace
What could be more fun?

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08-14-2010 02:56 PM  7 years agoPost 158
Malc1

rrKey Veteran

EVESHAM,UK

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Yeah I agree with the air leak conditions - possibly due to overheating the motor a bit.

Looking at the plug the engine has been running a little bit rich.I`ll lean it a little bit.
I`ve had the carb off and one of the isolator gaskets looked a bit wet so I`ve retightened the bolts.

I`ve left the linkage for now to give it another go.
Managed to re-tap a bigger thread in that throttle arm as well.

Minicopter Diabolo - Kosmik200,Pyro750-56
SpectraG + G26 3D Max

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10-18-2011 01:58 AM  6 years agoPost 159
OuttaControl

rrVeteran

Springfield,​Missouri -United​states

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curves

hmmm

Mine fall down, went BOOM!!

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02-12-2015 12:56 PM  33 months agoPost 160
OuttaControl

rrVeteran

Springfield,​Missouri -United​states

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linkage

Subscribed

Mine fall down, went BOOM!!

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HelicopterGasser Model RC HelicoptersOther › Gasser Throttle Linkage Setup
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