RunRyder RC
WATCH
 1 page 807 views POST REPLY
HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Radikal Engine temp?
01-12-2010 10:07 PM  8 years agoPost 1
Sean Bosse

rrApprentice

Germantown, MD.

My Posts: All  Forum  Topic

Hey guys,

I'm running a venom temp meter and the probe is mounted in between the first and second fins closest to the engine block. My question is does anyone know what temps I should see there? I was hovering around today and the my temps were about 275 degrees F. I freaked when I saw this and richened it up an 1/8 of a turn and then tried to fly again but couldn't even get the rpm's high enough to get off the ground. I leaned it out back to where it was before, and the rpm's came up again. Judging from this I assume that it is rich enough but the temps are a lot higher than what people are saying it should be. Is this because of where the sensor is mounted, and if so, is this normal?

Sorry for the long post.

BTW the motor only has 6 tanks through it so it is still breaking in.

Ohh yeah, even like this, this thing is a BEAST with 11degrees pitch!!!
Thank you,
Sean

PM  EMAIL  GALLERY  Attn:RR  Quote
01-12-2010 10:46 PM  8 years agoPost 2
Billme

rrElite Veteran

MS

My Posts: All  Forum  Topic

Sean, these things read way high has been my experience with them.. Unless you have a eagletree , or a laser temp gun, you get much better reading..

Based on 190 degs with a laser, the in flight temp is around 215 to 220 checked with a Oracle (just like a eagletree) in flight data logger..

PM  EMAIL  GALLERY  Attn:RR  Quote
01-13-2010 01:15 AM  8 years agoPost 3
darksidedave

rrVeteran

niles,MI

My Posts: All  Forum  Topic

Where is the best place to mount a Eagletree sensor and what method to attach it?
Thanks,
Dave

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
01-13-2010 04:38 AM  8 years agoPost 4
James Kovach

rrKey Veteran

canton, oh - US

My Posts: All  Forum  Topic

As Bill said, those Venom Temp sensors seem to be a little off sometimes. What I did when I used them is also used a Temp gun to see how much difference there was. I did this with my Oracle as well, but the two were really close.

I mounted my sensor for the Oracle between the second and third fin from the top of the head. It on the side of the engine opposite the Fan/Hub so it is not in the air flow coming from the cooling fan.

To mount it, well, mine was a pretty tight fit. I actually had to squeeze the metal housing down a bit to get it to fit in the fin and had to push it in pretty hard to get it in there. So mine was just "pressure" fit on the engine. I did not bolt it or glue it in. In the past I have pushed the sensor down into the fin and then use some red RTV to hold it in there.

Also, as Bill stated, the temps you get after landing and the in flight temps are going to be quite a bit different. Figure 20-30F higher for in flight. You can see what I mean by looking at this graph. Notice how fast and how much the temp drops after landing, when the RPM drops off.

Hope this helps.

*disclaimer: These are my opinions. Agree or disagree, Your Call :)
Let'r Rip Tator Chip

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
01-13-2010 05:17 AM  8 years agoPost 5
Sean Bosse

rrApprentice

Germantown, MD.

My Posts: All  Forum  Topic

Thank you guys for the input!

Where is the correct spot to read engine temp. with a laser temp gun?

Thanks again,
Sean

PM  EMAIL  GALLERY  Attn:RR  Quote
01-13-2010 05:21 AM  8 years agoPost 6
James Kovach

rrKey Veteran

canton, oh - US

My Posts: All  Forum  Topic

What I do is run the temp gun up and down the head and use the highest temp

*disclaimer: These are my opinions. Agree or disagree, Your Call :)
Let'r Rip Tator Chip

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
01-13-2010 05:40 AM  8 years agoPost 7
MAXHSHV

rrKey Veteran

,mn usa

My Posts: All  Forum  Topic

i use the laser temp gun and see 180 to 220 and as bill and james said it cools when landing so take that into acount.It is also very cold here right now between 0 and 30 f

Century heli rep. To much power is never enough.

PM  EMAIL  GALLERY  Attn:RR  Quote
01-13-2010 05:42 AM  8 years agoPost 8
Sean Bosse

rrApprentice

Germantown, MD.

My Posts: All  Forum  Topic

Hey sparx,

In reading the highest, is typically closer to the top of the head or near the block? Also, are you getting temps around 200 too?

Thanks,
Sean

PM  EMAIL  GALLERY  Attn:RR  Quote
01-13-2010 05:50 AM  8 years agoPost 9
James Kovach

rrKey Veteran

canton, oh - US

My Posts: All  Forum  Topic

The highest temps should be around the 2nd fin on the head. The thing is you need to get the temp on the head not the fin. That is why I say to just keep passing the temp gun up and down the head slowly and use the highest temp. It is almost impossible to pin point a spot to take a temp.

I am seeing temps of 180-200 when I use my temp gun. It depends on how hard I was just flying it and how quickly I get to the heli when I land. As Max said, keep in mind that it is pretty cold here. I have yet to fly on a day that was over 35F out. In the spring I am expecting temps to be 200-220 and in the summer 220-240.

*disclaimer: These are my opinions. Agree or disagree, Your Call :)
Let'r Rip Tator Chip

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
01-13-2010 05:54 AM  8 years agoPost 10
James Kovach

rrKey Veteran

canton, oh - US

My Posts: All  Forum  Topic

Also, after you learn the personality of this engine, you will not need to temp tune. I really do not think tuning solely on temps is the way to go. It is a good indicator, but will not give you the best tune. You really need to learn to tune by the sound of the engine and how it reacts when you hit it with a load.

To be honest, I do not even check with my temp gun anymore. I can now tune the engine by doing full collective climbs to get it in the ball park and then tweaking it after doing some "aggressive" flying. How the engine responds to load changes and how it is sounding is IMO the best indicator of how well you are tuned. Using a temp gun is a good guide, but you are getting a temp "after the fact". Meaning, you are not getting the temp in flight. As you can see from the graph, the cooling on the Radikal is quite impressive, KUDOS to Bill on that. You can see that by how fast the temp will drop after you drop the throttle down to idle.

*disclaimer: These are my opinions. Agree or disagree, Your Call :)
Let'r Rip Tator Chip

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
01-13-2010 06:00 AM  8 years agoPost 11
Sean Bosse

rrApprentice

Germantown, MD.

My Posts: All  Forum  Topic

Great, thank you for your time and insight sparx!

Sean

PM  EMAIL  GALLERY  Attn:RR  Quote
01-13-2010 06:04 AM  8 years agoPost 12
James Kovach

rrKey Veteran

canton, oh - US

My Posts: All  Forum  Topic

No problem. I am going to be putting up a review of the Radikal in the next few days. I go pretty in depth into how I go about tuning this particular engine. Hopefully it will be helpful to someone .

*disclaimer: These are my opinions. Agree or disagree, Your Call :)
Let'r Rip Tator Chip

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
01-13-2010 06:05 AM  8 years agoPost 13
Sean Bosse

rrApprentice

Germantown, MD.

My Posts: All  Forum  Topic

Cool, I'll be on the lookout for it.

Sean

PM  EMAIL  GALLERY  Attn:RR  Quote
01-13-2010 06:29 AM  8 years agoPost 14
nowinkk

rrNovice

LandBelowTheWings

My Posts: All  Forum  Topic

I flew my Radikal at the ambient temperature of about 32 degrees Celcius, and my infrared temperature gun read 139 degrees Celcius at the block near the exhaust. Is this temperature reading too high, in the tropical climate like mine?

PM  EMAIL  GALLERY  Attn:RR  Quote
01-13-2010 07:13 AM  8 years agoPost 15
Billme

rrElite Veteran

MS

My Posts: All  Forum  Topic

That seems kinda high but so long as you have good temp in the combustion zone..I check with a laser 2 fins down in the combustion zone on the carb side...about two fins in, and on the head, not the fin..180 to 200.. try to keep somewhere in between..

I'm reworking a cross over cooling system I've done, and will soon share it so air can move over the botton fins that will help with higher temp areas on the bottom..

Remember to run rich, and add throttle for power is the objective..

In most situation, there is no need to go below 11/4 on the low, and 11/2 on the high...

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 807 views POST REPLY
HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Radikal Engine temp?
 Print TOPIC  Make Suggestion 

 5  Topic Subscribe

Sunday, November 18 - 6:33 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

The RC discussion world needs to consolidate. RR is now one choice for that. Its software is cutting edge. It hosts on-topic advertising. Help RR increase traffic buy making suggestions, posting in RR's new areas (sites) and by spreading the word.

The RunRyder Difference

• Category system to allow Rep/Vendor postings.
• Classifieds with sold (hidden) category.
• Classifieds with separate view new.
• Answer PMs offsite via email reply.
• Member gallery photos with advanced scripting.
• Gallery photo viewer integrated into postings.
• Highly refined search with advanced back end.
• Hosts its own high end fast response servers.
• Hosts thousands of HD event coverage videos.
• Rewrote entire code base with latest technology.
• No off-topic (annoying) click bait advertising.
Login Here
 New Subscriptions 
 Buddies Online