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HelicopterAlignOther › Csm Carbsmart on my trex 600 N
11-27-2007 08:39 PM  10 years agoPost 101
Scrub

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Antioch, CA

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11-27-2007 09:00 PM  10 years agoPost 102
Jonty

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Wellywood

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How do you set the direction of the servo if you are using a Y connector for power?
I have not set up mine yet, but I understand that the servo does not require its own channel. All it is using the RX for is power so reversing is not an issue. Someone will jump in if I am wrong.

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11-27-2007 09:04 PM  10 years agoPost 103
ESWLFSE

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Liberty Hill, TX

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You set the low and high ends of servo travel with the pot and they can be at either end of the servo travel so reversing is a non-issue.

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11-27-2007 10:22 PM  10 years agoPost 104
Ghostrider

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San Diego, CA

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Thank you!

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12-02-2007 12:40 AM  10 years agoPost 105
GMPheli

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W. Bridgewater, MA USA

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Does anyone know if carbsmart can be used with an active mix carb? I could set the lean point so that it would be at the proper setting for it to idle. But would that be too lean for normal operation? I downloaded the manual, and it tells you how to set the maximum lean and rich points, but it does not give any direction as how to optimize them.

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12-02-2007 12:46 AM  10 years agoPost 106
mont_blanc

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UK

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optimise? Is that what the Carbsmart does using temperature?

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12-02-2007 12:48 AM  10 years agoPost 107
tchavei

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Portugal

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You optimize them by finding the sweet spot before setting up the carbsmart. That sweet spot should be center when the smartcarb servo is centered.

Tony


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"Perfection and patience usually walk side by side..."

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12-02-2007 12:53 AM  10 years agoPost 108
GMPheli

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W. Bridgewater, MA USA

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But you set the max lean and max rich settings with the pot. How do you know what to set them too?

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12-02-2007 12:57 AM  10 years agoPost 109
tchavei

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Portugal

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no no

You set max possible throw of the servo with the pot so that the carbsmart knows as far as it can go with the servo. The more travel the servo can do, the easier the job for the carbsmart to keep the temperature. As long as center is good for the engine, you won't burn it just because the unit closed the needle a quarter turn... if it starts to get hot, the carbsmart will open the needle remember?

Tony


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"Perfection and patience usually walk side by side..."

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12-02-2007 01:05 AM  10 years agoPost 110
GMPheli

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W. Bridgewater, MA USA

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Ah, thank you now I understand. So this means an active mix carb would work. It would have a great range. I was looking at a pic of the sensor online. It appears to be wrapped in heat shrink tubing? Would this not insulate the sensor? Or is it thermal heat shrink (if such stuff even exists)?

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12-02-2007 01:25 AM  10 years agoPost 111
FenderBean

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Clarksville, TN

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so do u set what temp u want or does the carbsmart know what temp is too lean?

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12-02-2007 01:32 AM  10 years agoPost 112
Jay1

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Colorado Springs

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What temp are you guys setting for the max and min temps for the OS 50?

Jay
Sooner or later, Gravity will win!

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12-02-2007 01:36 AM  10 years agoPost 113
GMPheli

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W. Bridgewater, MA USA

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You set the temp to 90, 100, 110, 120, 0r 130 degrees C. Jay you don't set a max and min, you just set a temp. From what I have read most people with the hyper are setting 100 0r 110

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12-02-2007 02:18 AM  10 years agoPost 114
tchavei

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Portugal

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110 on my YS

If you have a high output fan maybe 100 would be better as you will notice power decrease at 110C because the fan cools the engine way too much. I need to pitch pump the bird to get the temperature higher and the needle richer so it won't starve in whatever maneuver I want to do next. For example, if you start tic tocs right away from a hover, the first 3 are going to have less power because thats the time the carbsmart will need to open the needle as the engine gets hotter.

In this particular case, putting the needle at center setting a little richet and turning the carbsmarts gain a little lower helps

Tony


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"Perfection and patience usually walk side by side..."

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12-02-2007 03:47 AM  10 years agoPost 115
Jay1

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Colorado Springs

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I have an align metal fan. Not sure how efficient that one is. I may take your advice and set it at 110C.

Now I currently have it set where the engine runs pretty good at 1 turn out on Low and 1.5 turn on the high side. I am running a 60K carb. I will be doing the same thing on both needles where it will be set up with the 3:1 ratio.

Am I on the right track?

Jay
Sooner or later, Gravity will win!

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12-02-2007 04:27 AM  10 years agoPost 116
Jafa

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Sydney, Australia

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On a evo 50 the setting can be pushed up to 120C without worries as the fan doesn't cool that much. On a 600N I have to keep it around 110C since the fan cools the engine too much
Tony - is this correct or is there a typo?

You can the Evo at 120 cos the fan is poor
yet you have to run at 110 in the 600 cos the fan is strong?

That sounds back to front to me?

I always felt that the Sceadu Evo fan was pretty good - better than the Raptor 50 anyway


Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX

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12-02-2007 11:11 AM  10 years agoPost 117
tchavei

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Portugal

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Not a typo

We have two factors that will make an engine not run well.

a) overheating issues
b) fuel starvation

Until a few months ago, you usually would have both at a time on a normal machine. I.e if the engine was run lean, it would overheat and bog. With my evos, this would happen at around 130C. I've blown an engine at 194C and yet it was performing reasonably well till it siezed. Heat is what kills the engine.

Now with the appearance of high output fans and the more efficient cooling system of the 600N, suddently you can have one problem without the other. I.e. you can starve your engine to death (bogging) in the simplest maneuver but the engine will still be cool. I was able to lean out my Hyper so much that I wasn't able to do a loop without starting to count the blades and still the engine never got over 120C.

With a carbsmart it gets worse. If you set it to say 120C on a 600N with an high output fan what will happen? The engine is going to bog and loose power in most manuevers but despite this, it won't sieze because its not hot enough for that to happen. On a evo, since temperature is directly related to fuel mixture you can still (and will) have great performance at 120C because the engine naturally runs hotter even with richer settings because of the less eficient fan.

I used to run my hypers in my evos at 125C and all did at least 350 flights without the need for rear bearings or other parts. here is a pic of my Hyper with 287 flights on it: http://www.skynetlabs.org/fotos/eng2.jpg

Bottom line... cool is not always the best. The engine needs to have its internals at a minimum temperature and minimum fuel flow to work well.

Tony


--------------------
"Perfection and patience usually walk side by side..."

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12-02-2007 07:40 PM  10 years agoPost 118
mont_blanc

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UK

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after being so careful mounting my sensor on the head my engine burnt through the wires - annoying. But more worrying was the fact the sensor light stayed on until I unplugged the burnt cable. Longer heat shrink next time I think.

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12-03-2007 01:26 AM  10 years agoPost 119
Jafa

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Sydney, Australia

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Interesting Tony - can see where you are coming from

I have the GForce low output fan on my TRex600N and am not having problem getting heat into the engine in flight

I was becoming worried with the CarbSmart because the engine comes home much hotter than normal - without the Carb Smart the idle cools it off really quickly - with the Carb Smart it leans the engine to try and maintain the temperature, I'm not used to the high temperatures at the end of the flight and was wondering if this is a problem

But then I remembered that my fuel blender told me engines don't like sudden changes in temperatures - so a slow cool down may be ok


Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX

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12-03-2007 03:34 AM  10 years agoPost 120
tchavei

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Portugal

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Well it would be nice if you had an onboard logger to see if the carbsmart is indeed working properly. If your needle setting is too lean, the carbsmart can only open like a quarter turn and if thats not enough, the engine will be hot.

I'm using a quickUK fan right now which has been working fine but now temps have dropped even further so I might put in my HeV2 fan to keep the engine up to temp.

Btw today I was checking my flight temps and with the carbsmart set at 100C my max temp during flight was 106C. With the unit at 110C, my max temp during flight was 116C I did however notice on the charts that during hovering and mild flight, the engine was rather around 90C as it wouldn't heat up even on the carbsmart's leanest setting... time for a fan change I guess

Tony


--------------------
"Perfection and patience usually walk side by side..."

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HelicopterAlignOther › Csm Carbsmart on my trex 600 N
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