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Boca Bearings . Modefo's RC Helicopters . XHELI.COM

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Align T-REX 600N 700N > Csm Carbsmart on my trex 600 N
 
 
Simmer
Key Veteran
Location: Massachusetts

With a nod to Tony, there is a reason to use the Artic Silver epoxy compound:


Quote 
CSM recommends the use of heat transfer epoxy or RTV so I started to look for an adequate epoxy to cope with the job. I was finally convinced by a fellow modeler to go with Artic Silver Alumina Thermal Adhesive which seemed to be the best at the time. This epoxy is extremely heat conductive as it is packed with aluminum particles yet it doesnt contuct electrical current making it the perfect choice for this application


http://www.trextuning.com/carbsmart.php

/
03-24-2008 07:43 PM
 
 
l337sar
Heliman
Location: San Diego, CA

I just installed my carb smart on my Trex running an OS 50 hyper, Align medal fan. Setup when fine per instructions. My engine was running very good at about 1.2 turns out so thats were my 90 degree servo setting is. At startup the servo drives the needle to the lean position I set and engine start is fine. After about a 2 min hover I am not seeing the servo move the needle at all from the lean position however engine is defiantly running too lean. Engine is too hot for me to put a finger on the backplate. My temp in the carb smart is set at 100C. I tried 90 C and still no servo movement. I have not taken it to forward flight to try any power demanding maneuvers yet as I am wondering if I have a bad sensor. Is there any specific indication of a bad sensor? I get all the normal lights thats expected of the carb smart per the manual and if I unplug the sensor while power is on it moves the servo to the fail safe position of center so I think the sensor is ok. Should I lean the needle a little more to see if I get the servo to react? Or could it be because I am only hovering? Been doing my testing in the driveway so forward flight will have to wait for the R/c field. Any help will be appreciated.

------------------
Raptor 90SE
Trex 600n
www.skycamsandiego.com
05-19-2008 03:06 AM
 
 
rcadd1ct
Elite Veteran
Location: Richardson, Texas

You might have the lean rich direction mis-programmed into the carbsmart.

I doubt it, but that would be the first thing I would check.

-RCA .......... Making Cuisinarts Fly!!!!!!!
05-19-2008 03:31 AM
 
 
Xircom
Veteran
Location: Kuala Lumpur - Malaysia

anyone running carbsmart in a evo50 ?

I used one of the spare servo slots with a full sized servo - not to dig any holes or attach something to the frame but I am wondering if there is other good ways to do it, positions for micro servos and better suited to turn the arm in the right angle.

Thank you,

*** fly more ***
05-19-2008 03:32 AM
 
 
abgraham
Heliman
Location: Deep South Texas

Xircom:

Here's a thread on mounting the carbsmart on the Evo:

http://runryder.com/helicopter/t430763p1/
05-19-2008 04:08 AM
 
 
l337sar
Heliman
Location: San Diego, CA

When I installed my temp sensor I was careful as I have read how delicate these things can be. I used the third fin on my hyper head as I read this is the best place for it and pushed the sensor all the way in until it stopped. Not all the shrink tube on the sensor went all the way in. Here is a shot of my sensor mounting. Does this look ok to you guys? I am just wondering if this could be the cause of why my servo is not moving from the lean posotion during hovering.




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Raptor 90SE
Trex 600n
www.skycamsandiego.com
05-19-2008 04:25 AM
 
 
majestic12
Senior Heliman
Location: truckee, ca

I just went through the same deal with my carbsmart and I finally got it working like a charm. I have it posted in detail over on that other forum we don't talk about in their 600n section.

FURY for sale
TREX 600N PRO OS 50 HYPER-Align pipe
TREX 700N PRO OS 91 MP5
HF:STMPNGRND
05-19-2008 06:25 AM
 
 
l337sar
Heliman
Location: San Diego, CA

under the same username?

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Raptor 90SE
Trex 600n
www.skycamsandiego.com
05-19-2008 07:17 AM
 
 
majestic12
Senior Heliman
Location: truckee, ca

I post as stmpngrnd over there

FURY for sale
TREX 600N PRO OS 50 HYPER-Align pipe
TREX 700N PRO OS 91 MP5
HF:STMPNGRND
05-19-2008 07:46 AM
 
 
baddraptor
Elite Veteran
Location: valencia, ca- usa

It wont move from the lean position until it gets up to temp. Hovering doesnt work the engine to hard so it probably isnt reaching your set temp. Fly it for a bit and see if it moves.

**Unattended children will be givin a shot of espresso and a puppy**
05-19-2008 01:09 PM
 
 
Dr_Crash
Veteran
Location: Keller, TX

I've had great luck with my carbsmart. It has solved all of my lean run problems with the OS 50 hyper. I have also noticed sustained increases in performance.

I am not sure if these are still hard to get, but you could send bjacks a PM. I know he has several on hand at a great price.

Chris

FlightPower
Bobby Jack's Hobbies
Align
05-20-2008 01:35 AM
HOMEPAGE  
 
 
wrobijns
Senior Heliman
Location: Swalmen, the Netherlands

Great thread, It took me a while to go through all of the pages.
I'll explain why I needed all the info.
I'm flying two Raptor90's with an OS91SZ non-pumped engine.
I can get more power out of it without then with the Carbsmart so far. The problem is that the Carbsmart seems to overcorrect the temp changes and make is slobbering rich after a full load.

When I start out the power is great, but in a hurricane I can hear it go too rich and loose power.
I was looking for answers to correct it.
My servo can correct the main needle for about 160 degrees from fully lean to the richest setting, wich is a lot when I see others can only achieve 90 degrees tops.

My plan after reading this post:
- Shorter servo arm to turn the max angle down to 110-120 degrees
(should be plenty). This way the CS should not drown the engine
- Reduce the gain to 45-50% to avoid overcompensating if the max angle option is still not satisfying.

Your thoughts?

Walter Robijns, 3D rules !!!
05-21-2008 10:10 AM
HOMEPAGE  
 
 
steveru
New Heliman
Location: Ipswich

I'm a little confused what to do now with my Carbsmart!!

After following all the advice contained in the forum (trimming the heat shrink and securing with thermal epoxy) I'm experiencing over temperature.

I've installed the sensor in between the third cooling fin on an Align 50 Hyper in a new 600NSP with stock plastic fan. During the installation I also fitted another sensor in between the forth cooling fin which is connected to a small onboard temperature device which displays current, minimum and maximum temperatures.

I set the mid point to 1 o'clock (1 turn = 11 o'clock), the full lean position is 3 o'clock and the full rich position is 11 o'clock. At first I set the desired temperature to 90 to test the new gadget. After performing several flips I could see the mixture screw richening. (TIP - Glue a brightly coloured indicator onto the mixture screw clamp).

As I saw fuel dripping from the exhaust I increased the temperature to 100 and eventually 110 as most postings state that this is the preferred setting. After several flips, rolls and (ugly) tic-tocs I experienced a lack of power and head speed. At this point I brought the heli into a hover where I noticed to my surprise that the temperature reading was 125 and the back plate was HOT yet the mixture screw wasn't at full rich!!

Should I increase / decrease the gain from 50%, move the mid - point to give more / less fuel or practice better collective management on my tic-tocs?

I've recalibrated the Carbsmart and confirmed that the sensor is working. I'm using Wildcat 15% Nitro which contains 18% Synthetic oil, the weather is a cool 17 deg and I'm flying just above sea level.

As I'm a NOOB please help me as I'm concerned about damaging my new (well run-in) engine as the mixture screw is heading towards less than 3/4!!

Steve
06-22-2008 01:00 PM
 
 
tchavei
rrProfessor
Location: Portugal

increase gain and open the needle so base mixture is a little richer.

Tony


--------------------
"Perfection and patience usually walk side by side..."
06-22-2008 01:08 PM
HOMEPAGE  
 
 
husafreak
Senior Heliman
Location: NorCal

Here is how I am using my Carbsmart, it seems to be working well. I installed it on my Trex 600n/YS50/Hatori setup using an HS-65 servo. First I bench checked that the sensor was working (with a heat gun) and then installed it with JB Weld. I already ran over a case of fuel thru my engine so I know the leanest setting I ever use which is 1 1/4 turns on my YS. At the field I set the servo travel limit so the leanest it can go is 1 1/4. But it can richen the mix. I first flew at 90 deg and the Carbsmart commanded full rich and it was too rich, I then tried 100 deg and the Carbsmart commanded a slightly richer setting than I like, so I tried 110 deg and the engine ran like I normally run it with the CS commanding full lean or 1 1/4 turns. So now, barring sensor failure, I can run the engine hard and expect the CS will richen the mix if it begins to overheat, for whatever reason, but it can never lean the engine to failure. Thanks to all of you on the thread for the pics, I copied someones setup! and to Ed at Grand R/C for the idea of using the Carbsmart as a protection feature which can richen the mix but not lean it past a safe setting.
07-13-2008 05:13 PM
 
 
rookie5
Veteran
Location: Harlow, Essex - United Kingdom

hey guys. i've also bought a carbsmart. is a futaba 3102 ok to run on the carbsmart ?

cheers !
07-17-2008 07:52 PM
 
 
husafreak
Senior Heliman
Location: NorCal

the servo should be fine, check it on the bench before you install if there is any question.
07-17-2008 08:59 PM
 
 
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Align T-REX 600N 700N > Csm Carbsmart on my trex 600 N
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