Today's Message Index:
----------------------
1. 03:03 AM - Re: Rotax 912S mixture vs mag drop (jonathanmilbank)
2. 05:47 AM - Re: Rotax 912S mixture vs mag drop (rampil)
3. 10:54 AM - Tri Gear Main Wheels (Kelvin Weston)
4. 11:15 AM - Re: Tri Gear Main Wheels (Richard Wheelwright)
5. 12:07 PM - Re: Tri Gear Main Wheels (Steve Hagar)
6. 01:34 PM - Re: Tri Gear Main Wheels (Robert Borger)
7. 01:54 PM - Re: Tri Gear Main Wheels (Kelvin Weston)
8. 02:43 PM - Europa XS Simulation for Android. (Steve)
9. 05:32 PM - Re: Europa XS Simulation for Android. (rampil)
10. 06:07 PM - BRS (Wladimir Kummer)
11. 08:26 PM - Re: BRS (Fred Klein)
Message 1
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Subject: | Re: Rotax 912S mixture vs mag drop |
From:
"Erich Trombley"
Feb 27, 2009
Subject:
large mag drop on both mags, 912uls
While I can't speak to the 912ULS (I have a 914), I can share this story with you.
I too had mag excessive drop (600 + rpm) but only on one mag. I tried everything
I could think of including new spark plugs, plug wires, swapping coils,
purchasing a new coil, and overall conducting a very methodical diagnostic
test program. All to no avail. I could not figure out what was going on with
the engine. To make matters worse the problem seemed to have resolved itself
without me changing anything. I was pulling my hair out. As silly as this
is going to sound, it turned out to be mixture. Yes, mixture.
Interesting it was a function of ambient temperature. All of my testing was conducted
on the trailer in an unheated garage with the garage door wide open and
it was cold. It was only after the ambient temps increased that the problem
seemed to have gone away, however, I hadn't made that connection yet. Not realizing
what was going on and with the problem having seemed to have fixed itself
I made arrangements with a flight instructor to conduct a flight with me
the following morning. Well, as you can probably see where this is going, we
got to the airport in the morning and put the plane together. I started up the
plane and conducted a mag check. The problem was back, yet I hadnt changed
a thing. Also, I might add that even with the excessive mag drop the engine ran
very smooth. As such, the instructor suggested we take it up and see how it
performed in the pattern. There were no issues on the take-off roll and we
continued with the flight. After one circuit in the pattern, I performed a mag
drop on downwind... perfect not even 100 rpm drop. The engine was running
perfectly, although I did not know why.
It was during the Rotax class I learned why. The instructor asked if anyone had
experienced significant mag drop. I raised my hand, Yes, yes, I have, I proclaimed.
The instructor proceeded to walk me down a path asking other questions
such as, was the first time I noted the problem in the winter season or was
it year round, winter, I replied. I also noted that the drop was much worse
on one mag. He then asked if it was a 914, "yes" I stated. The problem surfaced
on the first flight of the winter season. In the four years prior to this
incident the problem never surfaced. However, the summer preceding this winter
flight I installed an inter-cooler. As ambient temps drop the air becomes
denser, and with this density change the engine gets leaner. It is the lean condition
that causes the excess mag drop. The inter-cooler only served to exacerbate
the situation, further cooling the inlet air.
The 914 differs from the 912 on the arrangement of the mags. On the 914 the top
plugs of all cylinders are connected one mag and the bottom plugs to the other
mag. On the 912 it is my understanding that one mag is connected to two top
plugs and two bottom plugs (opposing cylinders) with the other mag controlling
the other two top and bottom plugs. The cylinder heads of both the 912 and
914 are such that only one of the two plugs per cylinder is optimized for ideal
flame propagation/combustion (top I believe). Hence with the 914 when you
isolate the top plugs via a mag drop you will note a greater mag drop than with
the bottom circuit offline. With the 912 would see equal mag drops since two
top plugs and two bottom plugs are taken offline with each mag, thus cancelling
out the differences in the head design. With a lean mixture the drop is
more pronounced. The fix, change the needle valve setting to enrich the mixture.
Problem solved. Good luck with diagnosing the problem.
Please keep us posted on your progress.
Erich Trombley N28ET Classic Mono 914
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=448373#448373
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Subject: | Re: Rotax 912S mixture vs mag drop |
Yes, and you might see the increased air density effect at Furnace Creek
(L06) as well with a airfield altitude of -220 feet. (But probably not in
summer, I've seen OATs in excess of 120F there).
Keeping with the western paradigm, please allow me to share an aphorism taught
in medical schools: "When you are in cabin without windows on the high plains
of Colorado and you hear the massed hoof beats of a herd
outside, your first thought should not be of Zebras!"
Altered air mass and cylinder charge effects occur but I thought it relevant
to point out that they are rarely the life safety issue of a faulty ignition
system. Remember another great aphorism in the immortal (but
probably apocryphal) words of Willy Sutton (1901-1980): That's where
the money is!"
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=448375#448375
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Subject: | Tri Gear Main Wheels |
Hi All
Just fitted the Tri Gear main wheels to the main gear legs for the first time.
However, the slotted main axle nut spins on so far that it is completely clear
of the pre-drilled split pin hole. Picture attached.
Anyone else have this problem?
I assume the answer is to drill a new hole for the split pin but how easy will
that be in the hardened steel axle.
I have a pillar drill and some cobalt drills but have experienced problems with
hardened steel before.
Any advice on a solution?
--------
Regards
Kelv Weston
Kit 497
kelv@kdweston.biz
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=448386#448386
Attachments:
http://forums.matronics.com//files/axle_117.jpg
Message 4
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Subject: | Re: Tri Gear Main Wheels |
How about just adding another washer behind the nut
Sent from my iPhone
> On 30 Oct 2015, at 17:53, Kelvin Weston <kelv@kdweston.biz> wrote:
>
>
> Hi All
>
> Just fitted the Tri Gear main wheels to the main gear legs for the first time.
> However, the slotted main axle nut spins on so far that it is completely clear
of the pre-drilled split pin hole. Picture attached.
>
> Anyone else have this problem?
>
> I assume the answer is to drill a new hole for the split pin but how easy will
that be in the hardened steel axle.
> I have a pillar drill and some cobalt drills but have experienced problems with
hardened steel before.
>
> Any advice on a solution?
>
> --------
> Regards
>
> Kelv Weston
> Kit 497
> kelv@kdweston.biz
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=448386#448386
>
>
>
>
> Attachments:
>
> http://forums.matronics.com//files/axle_117.jpg
>
>
>
>
>
>
>
Message 5
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Subject: | Re: Tri Gear Main Wheels |
Make a spacer dude!
-----Original Message-----
>From: Kelvin Weston <kelv@kdweston.biz>
>Sent: Oct 30, 2015 10:53 AM
>To: europa-list@matronics.com
>Subject: Europa-List: Tri Gear Main Wheels
>
>
>Hi All
>
>Just fitted the Tri Gear main wheels to the main gear legs for the first time.
>However, the slotted main axle nut spins on so far that it is completely clear
of the pre-drilled split pin hole. Picture attached.
>
>Anyone else have this problem?
>
>I assume the answer is to drill a new hole for the split pin but how easy will
that be in the hardened steel axle.
>I have a pillar drill and some cobalt drills but have experienced problems with
hardened steel before.
>
>Any advice on a solution?
>
>--------
>Regards
>
>Kelv Weston
>Kit 497
>kelv@kdweston.biz
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=448386#448386
>
>
>Attachments:
>
>http://forums.matronics.com//files/axle_117.jpg
>
>
Message 6
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Subject: | Re: Tri Gear Main Wheels |
Keiv,
Go to ACS or one of the wheel/brake manufacturers (MATCO, etc.) and
obtain suitable spacers.
Blue skies & tailwinds,
Bob Borger
Europa XS Tri, Rotax 914, Airmaster C/S Prop (75 hrs).
Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP
3705 Lynchburg Dr.
Corinth, TX 76208-5331
Cel: 817-992-1117
rlborger@mac.com <mailto:rlborger@mac.com>
> On Oct 30, 2015, at 6:53 PM, Kelvin Weston <kelv@kdweston.biz> wrote:
>
>
> Hi All
>
> Just fitted the Tri Gear main wheels to the main gear legs for the
first time.
> However, the slotted main axle nut spins on so far that it is
completely clear of the pre-drilled split pin hole. Picture attached.
>
> Anyone else have this problem?
>
> I assume the answer is to drill a new hole for the split pin but how
easy will that be in the hardened steel axle.
> I have a pillar drill and some cobalt drills but have experienced
problems with hardened steel before.
>
> Any advice on a solution?
>
> --------
> Regards
>
> Kelv Weston
> Kit 497
> kelv@kdweston.biz
Message 7
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Subject: | Re: Tri Gear Main Wheels |
Hi Richard
I did consider packing it out with washers but the newer nut design, with the integral
flange, does not specify the use of any washers.
I believe the integral flange of the nut is being used to stop the bearing grease
seal rotating and I was a little concerned that this might not be achieved
with a stack of washers.
The MATCO procedure is to tighten the axle nut until the grease seal does not rotate,
although Europa specify a torque value of 150 in lbs for the nut in the
build manual.
I will try a stack of washers or a spacer and see what happens.
If I can achieve the stationary grease seal then it is certainly easier than drilling
the axle.
Thanks for the reply.
--------
Regards
Kelv Weston
Kit 497
kelv@kdweston.biz
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=448392#448392
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Subject: | Europa XS Simulation for Android. |
Fly N914XS before? Now you can again as I've written the attached free
simulator for it.
https://play.google.com/store/apps/details?id=com.stevokeano.angrycanyon
Using an NACA23012 airfoil with symmetrical stabs (Is the NACA23012 close
to our wing?). No flaps yet... It's perhaps a little over powered, but
fly's great once you get used to the mode 2 RC joysticks. Sorry, I cannot
afford apple developer Kit at the moment so its only available FREE on
Android.
Please note NO permissions are needed on your Android device just hours of
your time flying the plane!
Tata,
Steve Kean
PPSEL03
N914XS
https://play.google.com/store/apps/details?id=com.stevokeano.angrycanyon
Message 9
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Subject: | Re: Europa XS Simulation for Android. |
Hi Steve!
The Apple development system is FREE. Xcode is a free download and is the
IDE for iOS and OSX. What costs money is the ability to distribute your
product via the App Store. Have fun!
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=448398#448398
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Hello,
Do you know of any Europa with a BRS? Im considering installing one in my MotorGlider.
Still have the fuse top not bonded so I figure would be a not so difficult
mod.
Any ideas?
Best
Wladimir
Kit no. A193, XS Motorglider
Joinville - SC - Brazil
Message 11
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> On Oct 30, 2015, at 6:06 PM, Wladimir Kummer
<wladimirkummer@gmail.com> wrote:
>
> Do you know of any Europa with a BRS? I=99m considering
installing one in my MotorGlider. Still have the fuse top not bonded so
I figure would be a not so difficult mod.
>
> Any ideas?
I suggest a first step would be to contact Boris at BRS and spell out
your desires.
You may be familiar with the methods used to embed the harness in linear
recesses and cover them w/ break-away FG surface skins in the Cirrus. I
suspect those would be challenging to retrofit into the Europa
pre-moulded fuselage; however, the extent to which that is necessary
would depend upon C of G considerations. As an alternative, potentially,
a hard point of sufficient strength could be established between the two
doors which would minimize the necessary harness, but such calculations
are way above my pay grade.
Though I can only speculate, my hunch is that the weight of the
installation would suck up all of your baggage allowance and a good
portion of weight allocated for fuel.
Consider also the fact that the BRS system is intended to save lives,
not airframes, and few if any of the Cirrus aircraft which have
descended beneath a chute ever fly again.
Finally, consider the extent of the testing necessary for such a system
to be deamed to be effective and reliableare you really
prepared to go there?
F.
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