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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Operating temp comparison / cooling statistics:
10-22-2009 04:23 PM  8 years agoPost 221
CNCjunkie

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Kauai (The Garden Isle), Hawaii - USA

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Am I missing something?
That sounds like over kill.
The HS-7940TG is over kill, but the DS8717 is not?

I'm confused by the statement.

Just another crappy day in Paradise....Aloha!

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10-22-2009 04:54 PM  8 years agoPost 222
CNCjunkie

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Kauai (The Garden Isle), Hawaii - USA

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Breaking in a new motor I ran it at 11,000 also for a whole flight and checked the temps, also running at 210F just like CNCJunkie, which confirmed my thought that his temps are low due to easy flying during breakin.
Isn't the ambient temp in your area 10 to 15 deg cooler than it is here this time of year? Are you still using the Bergen fan on your 1005?

True, I'm just lumbering around and putting small loads here and there, but I don't think the conditions make for a good comparison in this case.

Just another crappy day in Paradise....Aloha!

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10-22-2009 05:38 PM  8 years agoPost 223
AceBird

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Utica, NY USA

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Sounds like if the hitecs work out with the Spectra I should get those for the 1005 as well.
You Raja, going to Hitec! Never though I would see that day.

Ace
What could be more fun?

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10-22-2009 09:51 PM  8 years agoPost 224
carpman

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Spain

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Just to breeze back on topic for a second...

If I was to go by the graph, then this could explain why I see 260 degree temps when I take them with an IR gun. If I land I can spool down in 15 seconds and take a reading which I think is high at 260, but this could be the peak of the heat soak as it just decreases all the time?

Using the graph as a bible should I land run the motor for at least a further 15 seconds and then think about taking the temperature some time after that?

Do you see what I mean?

KEVIN
Trex 500ESP | Trex 600NSP | Trex 700 Gasser | MA Spectra G

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10-22-2009 10:33 PM  8 years agoPost 225
gramey

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United Kingdom

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Here are some photo's taken with the thermal camera immediately after landing

I'm not sure what any of it means, perhaps the more enlightened can tell me if any of these show a problem with my temps?

Dumb thumb specialist

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10-22-2009 10:51 PM  8 years agoPost 226
Dr. Fibinotchi

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Sioux Falls SD

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wow
This is very interesting to look at. The exhaust temps I would have thought the pipe going back in the second picture would have been hot as well, but they didnt light up?

The one with 330 on the first picture its kind of hard to see what exaclly this is going to. Is this the back above the sparkplug?

-Cody

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10-22-2009 11:26 PM  8 years agoPost 227
gramey

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United Kingdom

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The 330 temp is the exhaust coupling just creeping into the back of the picture, I'm assuming the temperatures are showing hot at the coupler due it being teflon?
Interestingly, or worryingly from my point of view, is that in picture two it shows a hot spot on the clutch where it must be dragging slightly when warm.

Dumb thumb specialist

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10-22-2009 11:30 PM  8 years agoPost 228
xcellgasman101

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WOODWARD, OKLA....

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Using the graph as a bible should I land run the motor for at least a further 15 seconds and then think about taking the temperature some time after that?
Kevin,,
but this could be the peak of the heat soak as it just decreases all the time?
This is correct,, that probley just what is happening,,

the only temps that everyone is wanting to get, is at flying temp,,as these are what ruin a engine, What you could do is like Raja did, take temp readings every few seconds, and this will give you a better understanding of what is going on,, Heck, I have just left my temp gun running for a couple of minutes, just to log the temps, and how fast it cools down, If you wait 15 seconds to get the temps, the temp is all ready well on it's way down,, Hope that makes sence,

gramey,,, AWESOME!!!! Thanks for posting,,

Cody,,
The one with 330 on the first picture its kind of hard to see what exaclly this is going to. Is this the back above the sparkplug?
This is correct, and for the temps being down, on the header, it's made of Stainless Steel, and very thin, it should cool down, the fastest??, if you ask me,, XGM/VGM

John Crotts
www.soonerhelicamproductions.com

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10-23-2009 12:15 AM  8 years agoPost 229
gramey

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United Kingdom

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When the opportunity arises again I'll get some in flight, well bringing it to a hover immediately after a flight, that's if I can sort the air leak that's reared it's ugly head again!
Can't take the credit for the photo's they were done by a friend who had access to the camera, cheers Steve

Dumb thumb specialist

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10-23-2009 01:58 AM  8 years agoPost 230
rbort

rrProfessor

Franklin, MA - USA

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CNCJunkie
Yes I'm running the Bergen fan in my 1005 but if I remember right you're running the wally fan in your Spectra so I thought that was a wash with the fans.

Temps yesterday were close to 70F here, today it felt a little warmer I thought I should wear shorts but decided against it.

I checked my engine again today in idle up 1 with a little more harder flying and it checked in at 227. I checked someone else's broken in Hanson 26 in a 1005 stock fan with normal hard 3D flying and he came in at 275. We did some full power climbouts and richened it from 1 1/2 to 1 3/4 turns as richening it made the engine bog less so it was probably lean to start.

The new motor now has 7 flights on it or about 1:45 run time and its smoothed out already. Power is exceptional I need to change the pivot mixers on the blade grips to get more pitch range. At the end of the day I finally loaded it up with some bursts of full power and it showed no stress.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3288 flts
Whiplash V1-2 Hanson 300, 1570 flts
Whiplash V2 Hanson 300, 402 flts

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10-23-2009 02:32 AM  8 years agoPost 231
CNCjunkie

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Kauai (The Garden Isle), Hawaii - USA

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You're probably right about the fans being a wash, but the outside temps are spread 15 degrees. Just an observation and I still have a ways to go until I can really load up for extended periods and see what the temps are.

70 would be nice though. Even at 85 here, in the direct sun it feels like 90+ and if I fail to put on the sun block, I fry to a crisp.

Just another crappy day in Paradise....Aloha!

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10-23-2009 03:01 AM  8 years agoPost 232
Justin Stuart (RIP)

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Plano, Texas

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Gramey, That is the coolest thing I have seen in a long time. If we could rate posts, I think yours would be my first pick.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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10-23-2009 05:36 AM  8 years agoPost 233
Excalibur

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Destination: Earth

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Gramey, That is the coolest thing I have seen in a long time. If we could rate posts, I think yours would be my first pick.
Gotta agree. . . those pics are awesome. I would really vote for in-flight thermal pictures if you can do it safely. That would certainly help dispell a few myths.

Xcal

Camper Fuel: It's Not Just for Breakfast Anymore

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10-23-2009 05:55 PM  8 years agoPost 234
AceBird

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Utica, NY USA

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The exhaust temps I would have thought the pipe going back in the second picture would have been hot as well, but they didnt light up?
I'm assuming the temperatures are showing hot at the coupler due it being teflon?
Interestingly, or worryingly from my point of view, is that in picture two it shows a hot spot on the clutch where it must be dragging slightly when warm.
You have to know how to read thermal imaging. The surface that is facing the lens will read the highest temperature even though a section close to this surface but at a different angle is at the same temperature or even higher. The clutch shows a hot spot but just in a line. On either side it shows stone cold. Now you know that isn’t the case. How can the muffler show a section of high heat and have another section close by be stone cold? Putting the most expensive tool in the hands of the inexperienced does not guarantee success. There is so much involved with thermal imaging you must take care in drawing your conclusions.

The most accurate data will be collected from a thermo couple that is properly mounted. Using both technologies together at the same time will allow you to extrapolate values between multiple thermocouple points. Knowledge of thermo dynamics is also helpful.

The pictures are fun to look at but be careful about drawing any conclusions from them.
That would certainly help dispell a few myths.
I think not. You will only get more arguments from people that don’t understand the technology. It will be entertaining though so let the games begin.

Ace
What could be more fun?

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10-23-2009 05:57 PM  8 years agoPost 235
steveru

rrNovice

Ipswich

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Hi Graham,

Thanks for the mention.

Weather permitting this weekend, I reckon we should be able to get some in flight thermovision photos to satisfy Excalibur's request.
The best way to achieve this I believe, would be for you to lie on your back with the camera and I'll hover a couple of feet above you!!! We could always thermovision your lower half to check for 'hot spots' afterwards!!

All joking apart, I sincerely hope that the thermovision photos and advice from these guys helps you to get the gasser flying properly. I know that when I flew it I could 'feel' real potential.

See you Sunday.

Steve

ps If it helps, I can remove the thermovision layer to reveal the 'true image' photo to allow anyone to see more detail.

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10-23-2009 06:53 PM  8 years agoPost 236
broggyr

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Naugy, CT

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The pictures are fun to look at but be careful about drawing any conclusions from them.
The images are mostly blue, so it must have been freezing!!

- Brian
irony [ay-ruh-nee', ay-er-nee'] adj.: Like goldy or bronzy, but made of iron

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10-24-2009 12:07 AM  8 years agoPost 237
gramey

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United Kingdom

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Steve personally I think we need some shots from above so if I hover it just below waist high and you could lean over the top and take some shots. You've seen how rock solid my hovering is so there shouldn't be any risk involved, well at least not to me!

Dumb thumb specialist

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10-24-2009 02:49 AM  8 years agoPost 238
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Yes, we need more pics.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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10-27-2009 01:37 PM  8 years agoPost 239
gramey

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United Kingdom

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Not too many images as I'm not the greatest flyer so Steve had his work cut out trying to stick with it!

I think I was running a bit hot so I backed the HSN out 1/8th of a turn and it was smoother. I'm not sure if I need to go another 1/8th, I'll try it hopefully on Thursday and see how it goes.
Once again my thanks must go to Steveru, slowly we're starting to get their with this heli. Camera by the way for those interested is a Fluke Ti 55 so quite a serious piece of kit!

Dumb thumb specialist

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10-27-2009 03:49 PM  8 years agoPost 240
rbort

rrProfessor

Franklin, MA - USA

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Graham, since you got that thermal image camera
Land that heli just after you took the 269 hot temp picture (by the way, that area is about where I find my hottest temp too when I measure) and let's see when you shut down the motor hot much the temp goes up and for how long before it starts going back down.

I've you're taking pictures and not live video, maybe you need to take one every 3 seconds for the first 30 seconds after you shut down the motor to see what happens.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3288 flts
Whiplash V1-2 Hanson 300, 1570 flts
Whiplash V2 Hanson 300, 402 flts

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