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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Spektrum DSM › DX8 temp sensor
12-20-2010 10:13 PM  9 years ago
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Phoenix_8

rrApprentice

USA

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DX8 temp sensor
Can anyone post a picture of how and where they mounted their temp. sensor on their motor? The manual's picture is too small.

I'm using OS 91 HZ-Rs and a YS91 SR motor. What temps should I be looking for?

The motors were tuned pretty darn well during the warmer months. However, with winter now here, I'm leaning the needles in but I don't want to over do it. (EDIT: need to richen for cold weather)

I know to look for smoke and listen to the motor, but if my radio can add another safety net from running too lean, I'd like to use the tech.

Thanks in advance.
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12-20-2010 10:36 PM  9 years ago
Gehrbox

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Charleston,SC

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The motors were tuned pretty darn well during the warmer months. However, with winter now here, I'm leaning the needles in but I don't want to over do it.
Don't you mean richen the needles? Cooler air is more dense and to retain the same ratio as warm weather settings needs more fuel.

http://www.rc-model-airplanes.com/a...w-engine-tuning
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12-20-2010 10:52 PM  9 years ago
Phoenix_8

rrApprentice

USA

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tuning
Gehrbox,

You are absolutely right, thanks. My mistake. Second law of thermodynamics? Thanks for the reference.

Still need pics though.
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12-20-2010 11:06 PM  9 years ago
jschenck

rrProfessor

La Vista, NE.

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I'll take a pix when I get home but basically lasso the engine at the highest fin right below the head. Try to get the thick part of the temp sensor pushed into the fins a bit, centred in the front of the engine cylinder. I was able to do this on my last heli without dropping the engine by working the wire/sensor around the head through the shroud.
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12-20-2010 11:48 PM  9 years ago
Gehrbox

rrApprentice

Charleston,SC

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Still need pics though.
The tm1000 manual has a picture of the lasso method mentioned above.

http://www.spektrumrc.com/ProdInfo/...9548-Manual.pdf
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12-21-2010 04:03 AM  9 years ago
jschenck

rrProfessor

La Vista, NE.

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My 50

and my 90
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12-21-2010 03:39 PM  9 years ago
Phoenix_8

rrApprentice

USA

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Thanks for the picture, John. Did you have to use some sort of adhesive to prevent the wire from coming out?
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12-21-2010 03:58 PM  9 years ago
jschenck

rrProfessor

La Vista, NE.

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I didn't - What I did to is try to press the wire into the fins as best I could then use the silicone tubing sections to pull the noose as tight as I can get it. I also tied the wires down to the frame and wrapped them with spiral wrap along with other wires to help support them and protect them from being cut against the frame.

What we found very interesting is how much the temp of the engine fluctuates in a flight. Someone else was watching as I was flying around. It'll pop up 30F within a few seconds after hitting throttle hold for an auto. Could also immediately see the difference in a couple of clicks on the needles.

EDIT: For flying around temps I was seeing about 190-200 for good power. Any higher temps and I was a bit lean. If my temps get above 235F in an auto then I'm richening the needles. YMMV

I don't have a lot of time/experience with temps yet so still in the knee of the learning curve. Tough for me to tune an engine especially when it's cold outside and it's a 3 needle engine.
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12-21-2010 11:49 PM  9 years ago
Phoenix_8

rrApprentice

USA

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Thanks for all the info. Any explanations as to why the temp spike after throttle hold, less fan speed perhaps?
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