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Home✈️Aircraft🚁HelicopterThunder TigerRAPTOR 50 › Venom Micro Temp Onboard Gauge Battery Life
03-28-2009 01:14 AM  10 years ago
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aadams1278

rrApprentice

Wilson, NC - USA

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Venom Micro Temp Onboard Gauge Battery Life
i've been using the Venom Micro Temp on my 50 titan to keep track of max inflight temp.

i just installed it brand new on march 9th. since then i've flown using it 9 flights and a total of 85 minutes. Then i noticed today that the battery is dead. i can BARELY see that the display is coming on, but it's totally unreadable. i checked the battery and it is only 0.847 volts.

i didn't think i had left it turned on, but there's the possibility that i accidentally did.

does anybody else that's using this temp gauge notice that the battery life is extremely short? or does it look like i left it turned on by accident?
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03-28-2009 02:13 AM  10 years ago
PutU2Sleep

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Ocala, Florida-USA

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yeah, that seems quite a bit short. I just changed mine out and its been going for a year at least. But my flight time as been extremely limited lately too.

Maybe just a bad battery??
"Propofol"...got milk?
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03-28-2009 02:19 AM  10 years ago
RappyTappy

rrProfessor

Encinitas, CA

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I never left mine on every single flight. Usually only used it to aid in tuning for max temp under full power climbs for like the first flight of the day if I haven't flown for a while or if the weather changed.
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03-28-2009 02:52 AM  10 years ago
aadams1278

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Wilson, NC - USA

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i'm still pretty new to helis and i want to be extra careful not to burn up my engine. so i'd rather run it every flight so i know if it got too hot. i've seen it be done before and it ain't pretty. i MUST have left it on accidentally, because it was working great and then only a few days later won't display hardly at all.

a friend recommended that i try to get a lithium battery instead of the alkaline that comes with it. that may help too.
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03-28-2009 04:24 AM  10 years ago
RappyTappy

rrProfessor

Encinitas, CA

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Usually if your engine gets soo hot as to damage it during a flight, you won't need a temp gauge to tell you cause your engine will either quit mid flight or run like absolute cr@p, lol.
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03-28-2009 06:25 AM  10 years ago
Tolla

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Cape Town, South Africa

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So what kind of maximum temperatures is the motor runing at? I've got my EagletreeV3 hooked up together with the temperature loop around the head. Curious to know what temperatures you all are getting.
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03-28-2009 02:37 PM  10 years ago
aadams1278

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Wilson, NC - USA

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of course each engine is different and based on set up you're gonna have to figure out what works for you.

but the best guidance i've been getting is you want to be around but not higher than 220F on the head if you measure after landing. that leaves a little bit of time for the motor to cool off after doing intense maneuvers, so the 230s are acceptable during flight. but i try to keep it in the low 230s.

this is an os 50 hyper btw. and i've got the temp probe between the 2nd and 3rd blue fins.
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03-29-2009 04:41 AM  10 years ago
Tolla

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Cape Town, South Africa

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My OS Hyper runns a lot hotter than that in flight.Actually, the temp changes during flight, I suppose as the load on the motor changes. With the Eagletree I get a graph of the whole flights temp and it averages 110-125*C ( I make that 230-250F)
Anybody got any actual readings?
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03-29-2009 05:22 AM  10 years ago
aadams1278

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Wilson, NC - USA

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Tolla,
what's your headspeed and do you use a governor/limiter?

my heli is still pretty new and i set the throttle curve when i was first breaking in the motor. since then i've leaned quite a bit and just recently checked the tach again and it was way higher, about 2000. so i lowered the throttle curve to try to get it back where it needed to be. today was the first time i flew aggressively since lowering the headspeed and it was bogging quite a bit during tumbles. my temps were in the 250s for the first time ever, topped out at 256. that worried me so i richened but it was running poorly, so i believe my mixture was right. i ended up putting the throttle curve back up a little to keep the head from bogging so much. i do know that putting the engine under a load makes the temp higher. starting with a higher rpm makes the engine be under less load during maneuvers i guess. maybe increasing the headspeed will lower the temps a little, it did with mine today after i increased it again.
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03-29-2009 07:42 AM  10 years ago
Tolla

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Cape Town, South Africa

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governed at 2100 with an ATG ver3 governor. Datalogging the RPM tells me that the governor is fluctuating between 1900 and 2100, depending on how I load the head. If I richen the motor more then power suffers.I don't think I'm too hot, just wondering what other OS Hypers are doing.

Recently I had a sudden loss of power in flight, so I landed. Turns out I had a leaking fuel pipe, causing my motor to run very lean. The baseplate was way too hot. Checking the datalogger later showed that the motor was pushing 140*C ( 285F)
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04-22-2009 02:34 AM  10 years ago
aadams1278

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Wilson, NC - USA

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tolla,

i had a flight the other day where my temp went as high as 270F. i was really worried about that, especially since you say 285 is "way too hot". it was the first day that i had flown the heli (ever) when the outside air temp was 80 degrees. the next day it was 70 degrees outside and my temps were more normal.

how much temp fluctuation do you guys see with changes in outside temp?

my second battery has died on the micro temp. it was the other one that was included in the original package. both the batteries lasted about 20 days. i've bought another battery from radioshack and we'll see how long this one lasts.
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04-22-2009 03:04 AM  10 years ago
concho

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montreal canada

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same problem my battery is death after a week (of position)
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04-22-2009 03:05 AM  10 years ago
GREYEAGLE

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Flat Land's

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I buy em at Wal MArt
Sounds a bit crazey but the watch dept at walmart keeps them under the counter in bulk blister packs. Cheap ! Just ask - Just picked up 3 for under $5.00. !!!!

I easiley see temps in the 300's although I don't like it. My theromcouple K wire is embedded touching the "actual cylinder wall" and enclosed with silicon at the first fin . I'm reading cylinder temps. Typical is around 240 to 280.

I can also shoot the motor with my inferometer and at the same time get 147 at the lower case and 187 at the case just under the cylinder.\\ This afternoon I was getting 130.

Many cases idle temp is under 100!!!

Buy the time the blades stop to where as I can get a reading the temps are really crashing. I prefer to read the cylinder temp and not the cold crank case since the fuel is chilling it.

greyeagle
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04-22-2009 07:39 PM  10 years ago
Tolla

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Cape Town, South Africa

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aadams1278
I think i may have been getting dodgy temperature readings since that motors piston and ring were on their way out. Also, my temperature sensor was looped arount the cylinder head. I have since replaced piston, ring and liner and moved my temp sensor to right at the glow plug for, more accurate head temp readings.
Now,(today) an actual cylinder head temp reading of around 150*C (say 332F) will give me a count of 5-7 on the backplate right after landing.
I think, however, that the motor is running too cool at 150*C as I have way too much bogging.
Also, I was trying different glow plugs today and the O.S.#8 gave me way cooler temperatues and a straighter graph than the 'hot' plug of british manufature i was trying also.With the hotter plug teh temperature flucuations were quite severe.
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04-22-2009 11:27 PM  10 years ago
aadams1278

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Wilson, NC - USA

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i keep hearing about this finger on the backplate method and i'm still yet to get the engine hot enough that i can't hold my finger there indefinitely. i did not try this the day it was 270 though, so it may have been that hot then. hopefully i'm still rich though

do you guys just use the temps as a extra piece of information, or do you try to stick strictly to a maximum temperature. i keep hearing that i'm worried too much about my temps.
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04-23-2009 12:50 AM  10 years ago
LonR

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Macomb,Mi

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I bought 4 venom batterys at my hobby shop,2 of them lasted 1 day and my 3rd one is going on its 11th day.I bought a good Energizer battery (Battery number is 389 <--- same as the stock venom battery) cause im finding out its a hit or miss with the replacement venon batterys.Get a good brand name battery and you wont have the problem anymore.

On the O.S hyper temp,ive been running mine at 180-190F with the probe wire between the 2nd and 3rd cooling fin.If im right I can run the temp around 220-230F right?The back plate stays cool all the time.
600LE,OS55,OS PowerBoost pipe,Align 610's,Spartan
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04-23-2009 04:08 AM  10 years ago
aadams1278

rrApprentice

Wilson, NC - USA

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yeah i wasn't too happy when i found out the 389 battery i got from radioshack was $5 when the energizer one at walgreens is $4. not a big difference, but for only 20 days it's kindof a lot for a battery, and energizer is a better brand imo. the good thing about radioshack though is they had the battery sizing tool so they could tell me which one i needed to get (i didn't know the stock one was 389)
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04-23-2009 05:39 AM  10 years ago
Tolla

rrApprentice

Cape Town, South Africa

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I recently ran a sensor on the head under the plug and one bewteen the fins on the head, but not right up against the combustion chamber. I wanted to see what the actual difference in temperatures is between the two locations at the same time. The difference is considerable, between 25-35*C.Se temp readings will vary, depeding on wher the sensor is fitted.
Next i'm going to fit a sensor on the backplate so that i can get an accurate reading which I can then compare to the 'touch the backplate' method.
Looking at my temp graph I notice that the temp will drop rapidly upon hovering and landing, so even if the backplate falls withing the 'touch' limits, the temperature of the head during flight may have been all the way up to 180*C at some time during flight.
It stands to reason that if you cannot touch the backplate after landing, that your ,motor would have been running hot.
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04-23-2009 06:15 AM  10 years ago
LonR

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Macomb,Mi

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So where should I put the temp probe,between the head and block or where I have it now,between the 2nd and 3rd cooling fin?What should be a good running temp with my venom onboard?I thought 200F was too hot ?600LE,OS55,OS PowerBoost pipe,Align 610's,Spartan
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04-23-2009 03:52 PM  10 years ago
AaronJohnson

rrElite Veteran

mason,MI

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You have it right man, dont change it! Between the 2nd and 3rd fin on the hyper. Look for no higher then 230 F. Your back plate should always be just right if you check it.

Remember what we found about this. There will be roughly a 30 degree difference from where you are measuring the temp and where we checked it with my Raytek gun. When we show 200 on the back of the engine your temp probe between the 2nd and 3rd fin should be about 230F. Mine runs at 110C which is 233F and it has plenty of power and is living a long easy life.
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Home✈️Aircraft🚁HelicopterThunder TigerRAPTOR 50 › Venom Micro Temp Onboard Gauge Battery Life
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