Hi Raimo
Perhaps my eyes are not as good as they were, [?] But i cannot see any
Silicone paste
residue on the threads of your spark plug, Rotax recommend it to reduce
Spark plug temps,
I have used Dow corning DC340 to good affect on my engine,
best wishes
Ivor
On 9 October 2011 20:55, Raimo Toivio <raimo.toivio@rwm.fi> wrote:
> All who like to know what was it
>
> ***
>
> One week ago on Sunday I looked, found and solved the source for vibratio
n
> as follows:
>
> First I checked the overall appearance of the plane ' good
> Then I took the prop for a closer check and drove the blades to their
> finest positions ' all very exactly 17 degrees (measured from the tip e
nd).
> Then I drove them to the coarsest position ' all were again same and 29
,5
> degrees,
> Opened the cowlings ' just normal inside.
> Took off all the sparking plugs ' one until another were just great '
> colour like mild milk coffee...
>
> - until I took of the last (!) one: that was #3 (stbd side, rearmost) and
> lower one: it was sky blue (a colour like RAL 5015 or Pantone 2925C).
>
> It /they have been on service 57 hrs only.
>
> Attached a pic of it (it was not so easy to photo it to get a correct
> colour!).
>
> I replaced all the plugs for new. That was it. As I wrote earlier ' My
> Europa was after service just great.
>
> ***
> My mistake: I did not try during the flight one week ago the magnetos A a
nd
> B alone. I could not imagine that would be a solution for a smoother ride
.
> You remember ' one power selection and one rpm-selection only together
was
> acceptable to continue the flight with a reasonable vibra only.
>
> ***
> How could loosing only one plug to make such a hard situation? My only
> guess is that it was detonation; below and over certain rpm=B4s and map
=B4s the
> engine was very unhappy. Why so ' I am sure someone of you can explain
it.
> Certainly the plug has been very hot.
>
> ***
> I consulted a Finnish Rotax agent: during a last decade he remembered onl
y
> another case loosing a spark plug from Rotax. That case the spark was onl
y
> dead and no noticeable problems during the flight. His ten years are equ
al
> of well over 200.000 hrs of Rotax flight time (200 planes x 100 hrs /year
x
> 10 year).
>
> ***
> Dear competitors: I got several answers. Some of them are a bit funny but
> all are valuable. Thanks for great inputs. All of you, also those privat
> answers.
>
> Only one of you guessed the right answer. That was Bob Yearly by writing
as
> follows, that was a great list for all of
> us, thank you.
>
>
> Many things to check.
> Carbs:
> Check for a vacuum leak or a carb intake or carb to manifold leak.
> Especially since it seems to have just started and abates at low power
> setting.
> Check carb balance.
> Engine Electrics:
> First check ignition A and B separate.
> *Second check plugs, check coil. (one bad coil really shakes also)*
> *Pull plugs and look for differences.*
> Fuel :
> Check carb float bowls for dirt.
> Check fuel pressure regulator for 914
> Finally your fuel pump delivery pressure.
> Exhaust:
> Check no exhaust failure. Look at the entire exhaust for soot, looseness
or
> failures.
> Regards,
> Bud
>
> ***
>
> Problems: The Rules: one single guess per person, please.
>
> So, Bud is not a winner but that is not a problem for him I am sure.
>
> What is the jury=B4s decision? All of you (who gave a guess or more) will
get
> a little surprising shipment from Finland: just let me know your exact
> address info details direct to
>
> info@rwm.fi
>
> Also the daughters.
>
> Thanks,
>
>
> Terveisin,
> [image: allekirjoitus raimo]
> Raimo Toivio
>
> RWM-SYSTEMS
> "=E4lyk=E4st=E4 informaatiotekniikkaa vuodesta 1980"****
>
> [image: aaa]
>
> 37500 Lemp=E4=E4l=E4
> FINLAND
>
> p. 03 - 3753 777
> f. 03 - 3753 100
>
> www.rwm.fi
> info@rwm.fi****
>
>
> *From:* Bud Yerly <budyerly@msn.com>
> *Sent:* Wednesday, October 05, 2011 9:15 PM
> *To:* europa-list@matronics.com
> *Subject:* Re: Europa-List: Heavy In-flight Vibration Riddle
>
> Many things to check.
> Carbs:
> Check for a vacuum leak or a carb intake or carb to manifold leak.
> Especially since it seems to have just started and abates at low power
> setting.
> Check carb balance.
>
> Engine Electrics:
> First check ignition A and B separate.
> Second check plugs, check coil. (one bad coil really shakes also)
> Pull plugs and look for differences.
>
> Fuel :
> Check carb float bowls for dirt.
> Check fuel pressure regulator for 914
> Finally your fuel pump delivery pressure.
>
> Exhaust:
> Check no exhaust failure. Look at the entire exhaust for soot, looseness
> or failures.
>
> Regards,
> Bud
>
>
> ----- Original Message -----
> *From:* Raimo Toivio <raimo.toivio@rwm.fi>
> *To:* europa-list@matronics.com
> *Sent:* Saturday, October 01, 2011 3:44 PM
> *Subject:* Europa-List: Heavy In-flight Vibration Riddle
>
> All
>
> I have hope-so a nice riddle for you.
>
> Maybe all the answers are useful ' let=B4s collect them all:
>
> ***
>
> Yesterday I took off from *a very* remote /small /windy (90 degrees 12
> knots and gusting MUCH) grass strip. Soon until well over the ground at
> altitude +500 feet with full power and 2nd fuel pump still on and gears u
p I
> felt suddenly let us say medium or more shake and vibration. My immediate
> reaction was to go around and land immediately but abandoned because wind
> was so furious and I felt I cannot do that (a succesful landing).
>
> I decided to try to fly to the next possible sensible airfield EFHV which
> was 10 minutes apart.
>
> Those minutes were long: I put my prob (Airmaster CS) to manual and drive
d
> it from fine to coarse, tried all the power settings and also a 2nd fuel
> filter. Finally I noticed that when prop was in a climb mode (in my case
> 5400 rpm /Rotax 912S) and MAP around 20 inches I got quite a comfortable
> flying mode and I headed straight home. My airspeed was w that selection
> about 110 knots but because of a strong headwind GS was only about 70 kno
ts
> (wanted to be clearly over the ground at 3000 ft because it was well over
> sunset and totally dark, yesterday we got sunset around 1600 Zulutime and
> time was well over 1630 when flying).
>
> So, I pushed home one looooong hour. All the aerodynamics were well. I wa
s
> a bit worried my engine will separate or so. When trying to push more pwr
it
> was more vibra and when trying to pull less pwr same. I Followed a main
> highway and decided to land there if feeling so. Cars there with lights a
re
> almost like a lighted runway...
>
> Finally landing to the EFTP flawlesly.
>
> ***
>
> Today we had a FHGP (Family Hangar Grill Party). I tried to check my plan
e
> as well as I can. I found something. Very small evidence but something
> anyway. I tried to fix it and had a test run. I elected to go to fly '
hey I
> am a test pilot who else ' and She was better than ever!
>
> I managed to do 2 touches and goes when C172 did one with same runway.
>
> 140 knots during downwind makes me always happy.
>
> ***
>
> So ' dear Ladies and Gentlemen ' what was wrong?
>
> It would be nice and very life-useful to hear your opinions or guesses wh
at
> was wrong.
>
> ***
>
> The Rules: one single guess per person, please.
>
> The Prize: The Best Guess will get a Very Special Xmas Present from
> Finland!
>
> ***
>
> I will let you know a solution after a week ' be patient.
>
> Have a nice weekend and
>
>
> Cheers, Raimo Toivio
>
> [image: Europa A2A-ala2OK]
>
> Europa XS Mono OH-XRT #417
>
> Updated flight hours /landings: 258,3
>
> 37500 Lempaala
> FINLAND
>
> p +358-3-3753 777
> f +358-3-3753 100
>
> toivio@fly.to
> www.rwm.fi****
>
>
|