Today's Message Index:
----------------------
1. 12:19 AM - 2010 List of Contributors (Matt Dralle)
2. 02:40 AM - Re: Losing rpm on takeoff (Dave G)
3. 06:14 AM - Re: Losing rpm on takeoff (Roger Lee)
4. 06:49 AM - Re: Re: Rotax E-Learning video on detonation and pre-ignition (Noel Loveys)
5. 06:55 AM - Re: Losing rpm on takeoff (lucien)
6. 09:53 AM - Re: Rough Running 912 (moosepileit)
7. 10:29 AM - Re: Rough Running 912 (Roger Lee)
8. 03:54 PM - Re: Re: Rough Running 912 (Ken Ryan)
9. 04:14 PM - Re: Rough Running 912 (lucien)
10. 06:30 PM - Re: Rough Running 912 (Roger Lee)
Message 1
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| Subject: | 2010 List of Contributors |
Dear Listers,
The 2010 Matronics Email List and Forum Fund Raiser officially ended a couple of
weeks ago and its time that I publish this year's List of Contributors. Its
the people on this list that directly make the Email Lists and Forums possible.
Their generous contributions keep the servers and Internet connection up and
running.
You can still show your support this year and pick up a great gift at the same
time. The Contribution Web Site is fast, easy, and secure:
http://www.matronics.com/contribution
Or, by dropping a personal check in the mail to:
Matt Dralle / Matronics
581 Jeannie Way
Livermore CA 94550
I also want to thank Bob, Jon, and Andy for their generous support through the
supply of great gifts this year!! These guys have some great products and I encourage
you to visit their respective web sites:
Bob Nucklolls - AeroElectric - www.aeroelectric.com
Jon Croke - HomebuiltHELP - www.homebuilthelp.com
Andy Gold - The Builder's Bookstore - www.buildersbooks.com
And finally, I'm proud to present The 2010 Fund Raiser List of Contributors:
http://www.matronics.com/loc/2010.html
Thanks again to everyone that made a Contribution this year!!
Matt Dralle
Matronics Email List and Forum Administrator
Message 2
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| Subject: | Re: Losing rpm on takeoff |
Problem solved, although what is actually happening is a subject of some
debate.
Those who operate the Warp drive taper tip props or have experience with
them were exactly right and ignoring static RPM was clearly the way to
go. I ended up with a very nice smoooth prop after reducing pitch
significantly.
It is now pitched to allow 6200 rpm in full throttle climb at 0 deg
temp. I expect we will have to revisit this when it warms up. The engine
will overspeed quite easily on the ground until speed builds. I have
spoken to a
few others with the same type of prop and their expereince is similar.
Thanks to those who offered asistance, it would have taken somewhat
longer to get it right without it.
Message 3
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| Subject: | Re: Losing rpm on takeoff |
Hi Occom,
I have lots of people ask me what static rpm to set. My standard answer is; the
static is only a place to start when putting on a new prop and you have no real
idea of an exact pitch and final rpm. I always tell them set a general static
rpm and go fly. Flying is the only way to be exact and sure of the final results.
This is the only way to dial in a prop/engine rpm to match your plane and
local flying conditions.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=323340#323340
Message 4
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| Subject: | Re: Rotax E-Learning video on detonation and pre-ignition |
Any Ideas about the neighbourhood of the AOA for that?
Noel
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Dave
Austin
Sent: December 12, 2010 11:52 AM
Subject: Re: RotaxEngines-List: Re: Rotax E-Learning video on detonation and
pre-ignition
<daveaustin2@primus.ca>
I'd be a bit concerned that with prop set to 5300 static that it could
easily over-rev on climbout.
I use 5000 static.
Dave
Message 5
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| Subject: | Re: Losing rpm on takeoff |
[quote="occom"]Problem solved, although what is actually happening is a subject
of some debate.
Those who operate the Warp drive taper tip props or have experience with them
were exactly right and ignoring static RPM was clearly the way to go. I ended
up with a very nice smoooth prop after reducing pitch significantly.
It is now pitched to allow 6200 rpm in full throttle climb at 0 deg temp. I expect
we will have to revisit this when it warms up. The engine will overspeed
quite easily on the ground until speed builds. I have spoken to a
few others with the same type of prop and their expereince is similar.
Thanks to those who offered asistance, it would have taken somewhat longer to
get it right without it.
> [b]
That sounds pretty close to me. On my Kolb/503, I got about 6300 on a normal climbout
(tho I don't actually remember that speed offhand), tho that was slightly
underpropped for WOT at straight and level IIRC.
But like I said, tho I love my powerfin, I wish I could make my 68" taper tip work
on my tornado. Once I had the pitch dialed in I was able to do 100mph indicated
(about 110mph true) at only half throttle at 10,000' MSL. Plus, I could
get a virtually constant 5400rpm on climbout even varying between 65 and 80mph
indicated.
The static rpm always seemed to settle at about 5200 rpm no matter what the pitch
was set at (I went from 13.5 to about 15 degs in the course of the dialing
in and the static was always the same).....
LS
--------
LS
Titan II SS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=323342#323342
Message 6
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| Subject: | Re: Rough Running 912 |
My Kitfox w/ 912 UL 80 hp came from a 5000' MSL field and is now hangared at sea
level. It was rough from around 4000 to 3700 rpm on a digital tach. and has
2 egts running @ 1400 degrees.
Carb needles were up at position 2. Makes sense for where the plane used to live.
Dropped the clip to normal positions 3, raising the needle and the egts are
the same, but now smooth running all rpms. (Thanks, Roger!)
I thought it might take dropping to clip position 4 to fully raise the needle or
a change of needle and jet from standard as it's now mid 30's when I fly, but
the position 3 did it for me.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=323361#323361
Message 7
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| Subject: | Re: Rough Running 912 |
Position 3 on the carb needle is normal and a good place to be for the majority
of us. If you live and fly from high elevations then maybe #2, but be ware if
you come down to visit us low landers.
#3 is good for most during summer and winter. The more you tinker against what
Rotax advises the more chance of making a costly error or a poor running engine.
You need to be able to fully understand the Rotax engine and how to accurately
interpret engine information on the gauges or test equipment. If you don't
then leave it as the factory set it up and you will fly to your TBO without any
issues.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=323365#323365
Message 8
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| Subject: | Re: Rough Running 912 |
So all of this talk of changing needle positions based on altitude has me
wondering. What if you want to fly from sea-level to high altitude? What
then???
Ken Ryan
Anchorage, Alaska
On Tue, Dec 14, 2010 at 12:26 PM, Roger Lee <ssadiver1@yahoo.com> wrote:
>
> Position 3 on the carb needle is normal and a good place to be for the
> majority of us. If you live and fly from high elevations then maybe #2, but
> be ware if you come down to visit us low landers.
> #3 is good for most during summer and winter. The more you tinker against
> what Rotax advises the more chance of making a costly error or a poor
> running engine. You need to be able to fully understand the Rotax engine and
> how to accurately interpret engine information on the gauges or test
> equipment. If you don't then leave it as the factory set it up and you will
> fly to your TBO without any issues.
>
> --------
> Roger Lee
> Tucson, Az.
> Light Sport Repairman - Maintenance Rated
> Rotax Repair Center
> Home 520-574-1080 TRY HOME FIRST
> Cell 520-349-7056
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=323365#323365
>
>
Message 9
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| Subject: | Re: Rough Running 912 |
kenryan wrote:
> So all of this talk of changing needle positions based on altitude has me wondering.
What if you want to fly from sea-level to high altitude? What then???
>
> Ken Ryan
> Anchorage, Alaska
>
You shouldn't have to change anything. I live at 7000' MSL (northern NM) and fly
usually up to 9999' MSL, even on local messing-around flights. My carbs still
have the factory jetting and they compensate fairly well. Mine run a bit rich
at low power settings (i.e. between 2000 and 3000 or so on the ground or during
approaches) and it's going to idle rich also (if you use the factory 1.5 turns
on the idle needle). But at full power it still leans out fairly well, giving
EGT's in the 1250 to 1350F range.
So shouldn't be a problem...
LS
--------
LS
Titan II SS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=323383#323383
Message 10
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| Subject: | Re: Rough Running 912 |
I'm with Lucien. leave it alone. You will be a little rich for that flight, but
so what it will fly just fine. Making a permanent needle adjustment should mean
you are more or less permanently at altitude.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=323400#323400
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