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Did a stall, and engine almost quit.

 
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motoadve



Joined: 23 Apr 2009
Posts: 74
Location: Seattle

PostPosted: Mon May 13, 2019 4:05 pm    Post subject: Did a stall, and engine almost quit. Reply with quote

This stall was no different than all the ones I have practiced before, clean power off, at recovery when I added power (very smoothly as I always do) engine sputtered and stumbled, then continued fine.

During descend to pattern when I reduced power, engine was running a bit rougher than usual , not terrible but I noticed it, 5 MP and 2000 RPMs.
Added some power at pattern and it smoothed out also at low power settings for the landing was smooth.

Any theories?


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Harv



Joined: 01 Jul 2010
Posts: 132

PostPosted: Tue May 14, 2019 7:11 am    Post subject: Re: Did a stall, and engine almost quit. Reply with quote

I had similar issues with my CJ, happened after about 30mins flight time and adding power smoothed it out. Problem became worse during subsequent flights and it turned out to be failing mag coils. I couldn’t repeat the issue on the ground even after prolonged warmup and ground running.

How long into your flight before this occurred?
I removed the old mag coils, had them both rewound and it now runs stronger than ever.

Just my thoughts.

Maybe do a few more over airfield flights for plus 30 mins and see if it happens again.


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richard.goode(at)russiana
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PostPosted: Tue May 14, 2019 7:30 am    Post subject: Did a stall, and engine almost quit. Reply with quote

That is a classic coil problem which will only manifest itself when the engine is hot and the heat has totally penetrated the magneto and, more specifically the coil. It is very difficult to get the magneto sufficiently hot to have this partial failure on the ground. And the only solution is to change the coil!
RICHARD GOODE AEROBATICS
Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK
Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
e-mail: richard.goode(at)russianaeros.com
www.russianaeros.com
WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES
In partnership with Aerometal Kft, Hungary.

--


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dsavarese0812(at)bellsout
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PostPosted: Tue May 14, 2019 10:09 am    Post subject: Did a stall, and engine almost quit. Reply with quote

If I may ask, who rewound the coils?
Thx
Dennis

Sent from my iPhone

Quote:
On May 14, 2019, at 11:11 AM, Harv <martin.harvey(at)kbr.com> wrote:



I had similar issues with my CJ, happened after about 30mins flight time and adding power smoothed it out. Problem became worse during subsequent flights and it turned out to be failing mag coils. I couldn’t repeat the issue on the ground even after prolonged warmup and ground running.

How long into your flight before this occurred?


I removed the old mag coils, had them both rewound and it now runs stronger than ever.

Just my thoughts.

Maybe do a few more over airfield flights for plus 30 mins and see if it happens again.




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=489220#489220











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Harv



Joined: 01 Jul 2010
Posts: 132

PostPosted: Tue May 14, 2019 11:13 pm    Post subject: Re: Did a stall, and engine almost quit. Reply with quote

In the UK we have some specialist firms who have been rewinding coils for something like 75years (family run business) and they handled it.

Contact me off list if you need any more details.


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richard.goode(at)russiana
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PostPosted: Wed May 15, 2019 12:22 am    Post subject: Did a stall, and engine almost quit. Reply with quote

Yes, after over 30 years' experience with these engines, and particularly
the magnetos/coils, we investigated all the significant UK companies engaged
in magneto overhauls, and chose the one we felt was the best. They designed
a new coil for us three years ago, and importantly with an external
capacitor/condenser. The reason for this is that the primary cause of
failure is the capacitor overheating and degenerating with age, and of
course this is made worse since it is normally sitting inside a coil of hot
wire!

So we now make new coils with a high-technology Panasonic capacitor bonded
to the outside of the coil so it remains cooler, but still fits comfortably
inside the magneto. We have sold many to customers all over the world with
100% satisfaction!

Richard
RICHARD GOODE AEROBATICS
Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK
Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
e-mail: richard.goode(at)russianaeros.com
www.russianaeros.com
WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES
In partnership with Aerometal Kft, Hungary.

--


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dsavarese0812(at)bellsout
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PostPosted: Wed May 15, 2019 3:21 am    Post subject: Did a stall, and engine almost quit. Reply with quote

Thanks Richard. Now that I know where to go, you can be sure when folks ask me, I'll be sending them your way.
Dennis


On Wednesday, May 15, 2019, 4:25:30 AM EDT, Richard Goode <richard.goode(at)russianaeros.com> wrote:




--> Yak-List message posted by: "Richard Goode" <richard.goode(at)russianaeros.com (richard.goode(at)russianaeros.com)>

Yes, after over 30 years' experience with these engines, and particularly

the magnetos/coils, we investigated all the significant UK companies engaged

in magneto overhauls, and chose the one we felt was the best. They designed

a new coil for us three years ago, and importantly with an external

capacitor/condenser. The reason for this is that the primary cause of

failure is the capacitor overheating and degenerating with age, and of

course this is made worse since it is normally sitting inside a coil of hot

wire!

So we now make new coils with a high-technology Panasonic capacitor bonded

to the outside of the coil so it remains cooler, but still fits comfortably

inside the magneto. We have sold many to customers all over the world with

100% satisfaction!

Richard

RICHARD GOODE AEROBATICS

Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK

Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129

e-mail: richard.goode(at)russianaeros.com (richard.goode(at)russianaeros.com)

www.russianaeros.com

WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES

In partnership with Aerometal Kft, Hungary.

--


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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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