RunRyder RC
WATCH
 1 page 1539 views POST REPLY
HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › OS 91 HZ stalled in flight
04-27-2010 04:55 AM  8 years agoPost 1
Bouchah

rrKey Veteran

Willow Spring, N. Carolina USA

My Posts: All  Forum  Topic

I was flying my Freya over the weekend, 2nd flight of the day / season for that matter. Prior to the first flight the motor was difficult to get started but I did get it. It started fairly easy for the second flight. Just doing some easy circuits and stall turns when I was doing a fly-by about 20' up right in front of me the engine cut out. Forced auto, I thought I had it but my blades were apparently too loose so one of them wacked the boom.

What I dont understand is why the engine cut out. It is a Non pumped OS 91 HZ, I was running 15% CoolPower. I removed the glow plug, OS #8, hooked it to my glow igniter, It glows good. I removed the pipe, (Outrage Pipe) I was praying the motor was not cooked. Once I unbolted the pipe it seemed like oil was dripping out of the pipe and the exhaust port on the engine. Oil from the fuel I would imagine. Looking in the exhaust port the engine looks like new still. Also looked very wet, oil or fuel, It is wet.

When I was flying, It was at a fun-fly, there were several other helis flying that day. One thing I noticed was the exhaust coming from my pipe was not as heavy as many of the other birds flying, could that be due to different fuel brands or nitro %? Could running an engine too rich cause it to stall out as well as to not have a heavy exhaust smoke cloud? The day of the FF it was about 50 degrees out, Im guessing. When I tuned the engine initially last summer it was probably 80 deg out.

PM  EMAIL  GALLERY  Attn:RR  Quote
04-27-2010 05:53 AM  8 years agoPost 2
outhouse

rrVeteran

auburn ca

My Posts: All  Forum  Topic

rich motors smoke more and run cooler.

i would check all my fuel tubing and piston/ring condition for starters

PM  EMAIL  Attn:RR  Quote
04-27-2010 01:51 PM  8 years agoPost 3
ttrip06

rrApprentice

Central Pa

My Posts: All  Forum  Topic

15% Cool Power does not produce any where the amount of smoke that 30% does. Was the engine hot when you checked? Have you verified your fuel filter is clean? How full was the tank? When was the last time you changed the plumbing?

Just some additional things to check

Tim Tripoli

Team Futaba, Rail Blades
Team Crash
ProggressiveRC

PM  EMAIL  GALLERY  Attn:RR  Quote
04-27-2010 02:31 PM  8 years agoPost 4
crflyer

rrApprentice

Maine

My Posts: All  Forum  Topic

I would replace the fuel lines in the tank,and make sure the carb is clean.
Replace the glow plug,even though it glows it still can be bad.
If the coating on the plug coil is worn off it will not work right.
CR

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
04-27-2010 02:41 PM  8 years agoPost 5
pkfrizzlefry

rrApprentice

Newington, CT (Central Connecticut)

My Posts: All  Forum  Topic

In my experience...
It is not that common for an engine to just DIE like what you described...but in reality it DOES happen, rarley but does...Sometimes its due to what the ppl above said so check all that...i had smaller engine that when i was just starting out it would just DIE for no apparent reason and make me crash...Then it ran fine for the next 40Tanks....

I would however make sure your fuel pickup is long enough to pickup fuel at all heli orientations as well as run a header tank if your not yet running one...

For me a header tank resolved 90% of my stall issues in the past so i will never fly without one, but i had many engine issues that drove me crazy... Though i did fine the larger engines to be more reliable..

Good Luck

Fly, Fly then Fly some more!!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
04-27-2010 03:38 PM  8 years agoPost 6
Bouchah

rrKey Veteran

Willow Spring, N. Carolina USA

My Posts: All  Forum  Topic

The heli was a new build last season, the fuel tubing was brand new as well. Ive only put maybe 6 flights on it. Is it normal to have alot of oil in the exhaust pipe when removing it from the engine?

I didnt check the temp of the motor when it crashed, I was not thinking too clear at the time.

The fuel tank was 3/4 full if not more, I do run a header tank.

The piston ring looks fine, checking through the exhaust port.

How do you clean the carb?

I have a new plug I am going to install. I am also going to install a new filter cartrige in the Align filter. The filter was also new with the build.

PM  EMAIL  GALLERY  Attn:RR  Quote
04-27-2010 03:39 PM  8 years agoPost 7
bbaxter

rrApprentice

Central Illinois

My Posts: All  Forum  Topic

If you tuned the engine in 80-degree weather and never changed the needle valve, then the engine would be too lean in 50-degree weather. When the air is cooler, it is more dense, so you need more fuel to keep the same mixture. A glow engine needs to be adjusted every time you go out to fly to suit conditions...at least you need to check the mixture to make sure it's correct. The engines are not "set and forget". That will cause engines to become ruined!

PM  EMAIL  Attn:RR  Quote
04-27-2010 03:54 PM  8 years agoPost 8
cbflys

rrVeteran

Nesconset, NY - USA

My Posts: All  Forum  Topic

^
|

What he said

PM  EMAIL  GALLERY  Attn:RR  Quote
04-27-2010 04:08 PM  8 years agoPost 9
red_z06

rrProfessor

Dumont, NJ

My Posts: All  Forum  Topic

If it was tuned just right at 80, it would cause a leaner run at 2-3 clicks toward lean. But, if it was tuned lean at 80, that may be enough to seize if it is worked hard at 50.

Lean run that elevates the engine to run hot will not settle down to idle quickly when you hit T-H. Instead of coming down to idle, it will come down gradually taking 1-2 sec before settling down. This is an indicator to back off on the needle.

If you are lucky, it will start normally at the same idle setting. However, if there is a liner damage, you will have trouble starting it at idle. If so, you will have to inspect the ring, piston, and the liner for damage.

www.JustinJee.com

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
04-27-2010 04:50 PM  8 years agoPost 10
Bouchah

rrKey Veteran

Willow Spring, N. Carolina USA

My Posts: All  Forum  Topic

You think it could have been running lean with all the oil that came out of the pipe when I removed it?

When we set the needle to break in the engine it was very rich to start then we backed it off a bit but I dont think it was dialed in all the way. I think it was still a little rich.

PM  EMAIL  GALLERY  Attn:RR  Quote
04-27-2010 05:11 PM  8 years agoPost 11
marc8090

rrElite Veteran

Long Island, N.Y.

My Posts: All  Forum  Topic

Sounds like a simple lean run and overheat to me.

PM  EMAIL  Attn:RR  Quote
04-28-2010 01:19 AM  8 years agoPost 12
Yug

rrMaster

UK. Herts

My Posts: All  Forum  Topic

What was your head temp or backplate temp ? Lots of smoke is a good thing.

Vegetable rights and Peace

PM  EMAIL  GALLERY  Attn:RR  Quote
04-28-2010 01:52 AM  8 years agoPost 13
Bouchah

rrKey Veteran

Willow Spring, N. Carolina USA

My Posts: All  Forum  Topic

Like I said earlier, after the crash I didnt think to check anything. Im not sure what the temp of the engine or backplate was.

PM  EMAIL  GALLERY  Attn:RR  Quote
04-28-2010 03:06 AM  8 years agoPost 14
Chris.C

rrVeteran

Hong Kong

My Posts: All  Forum  Topic

After you checked everything and sure it should be ok, put a header tank.

I had this before in a Freya with SZ. Occasionally it die after come out a vertical stall turn. I tested it many times with preparation of autorotation, of course. It happens mostly after or finishing a vertical stall turn.

After I put the header tank, it never happened again.

PM  EMAIL  GALLERY  Attn:RR  Quote
04-28-2010 03:35 AM  8 years agoPost 15
rumbleweed

rrNovice

Maryland=USA

My Posts: All  Forum  Topic

Also check your clunk lines, Since you are using exhaust pressure fuel delivery, the gases pumped into the fuel tank damage the klunk lines. These will eventually fall apart and cause your engine to run lean either by sucking in air or by clogging the fuel system. Clunk lines should be replaced at least one a season.

PM  EMAIL  Attn:RR  Quote
04-28-2010 03:08 PM  8 years agoPost 16
pkfrizzlefry

rrApprentice

Newington, CT (Central Connecticut)

My Posts: All  Forum  Topic

Keep in mind...
After each run, and especially a flameout...

Get into the practice of touching the backplate... Its quick to do but the information you get is priceless...They tell me that if you cannot hold your finger there for 5 sec, its too hot!

Always a good idea to check, no matter what!

Fly, Fly then Fly some more!!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
04-28-2010 09:21 PM  8 years agoPost 17
Bouchah

rrKey Veteran

Willow Spring, N. Carolina USA

My Posts: All  Forum  Topic

Keep in mind...

After each run, and especially a flameout...

Get into the practice of touching the backplate... Its quick to do but the information you get is priceless...They tell me that if you cannot hold your finger there for 5 sec, its too hot!

Always a good idea to check, no matter what!
Thanks for the tip, I will try to keep that in mind.

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 1539 views POST REPLY
HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › OS 91 HZ stalled in flight
 Print TOPIC  Make Suggestion 

 6  Topic Subscribe

Friday, December 14 - 5:22 pm - 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