Today's Message Index:
----------------------
1. 05:48 AM - IDLE RPM (Damien)
2. 11:35 AM - Re: IDLE RPM (Hugh McKay)
3. 11:47 AM - EIS 2000 582 to 912 ? (egp8111)
4. 11:50 AM - Re: IDLE RPM (Duncan & Ami McFadyean)
5. 12:21 PM - Re: IDLE RPM (rampil)
6. 12:34 PM - Re: IDLE RPM (Roger Lee)
7. 12:59 PM - Re: IDLE RPM (Damien)
8. 01:07 PM - Re: Re: IDLE RPM (Joel M.)
Message 1
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Hello. I need to set the idle speed on my Rotax 912 80HP. The
maintenence manual states
that the idle speed should be 1400 RPM. I have a mechanic friend who
feels that would be too low. He is
concerned about the gearbox. Any comments ?
Damien
Zodiac 601 HDS
Message 2
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Damien,
Some have stated that 1400 is OK, but I get way too much "chatter" in my
gear box at that rpm, and I know that is not good for the gears in the
gear box. I set my idle speed at 1800 because that is where my engine
idles best. Some set theirs at 1600. I would recommend an idle speed in
the range of 1700 to 1800 rpm.
Hugh McKay
Allegro 2000
Rotax 912 UL
380 hours
From: Damien
Sent: Sunday, July 25, 2010 8:48 AM
Subject: RotaxEngines-List: IDLE RPM
Hello. I need to set the idle speed on my Rotax 912 80HP. The
maintenence manual states
that the idle speed should be 1400 RPM. I have a mechanic friend who
feels that would be too low. He is
concerned about the gearbox. Any comments ?
Damien
Zodiac 601 HDS
Message 3
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| Subject: | EIS 2000 582 to 912 ? |
Does anyone know if an EIS 2000 set up for a Rotax 582 can be converted to use
on a 912 ?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=306233#306233
Message 4
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I find it useful to be able to pull back on the throttle to get the revs
to 1400, so that (in a slippery 'plane) a less flat approach angle can
be followed (in practice this does means 1400 rpm in the glide) there is
also less taxiing on the brakes, and to allow shut down with less
kickback. But agree that 1600rpm is a better normal idle speed.
Duncan McF
----- Original Message -----
From: Hugh McKay
To: rotaxengines-list@matronics.com
Sent: Sunday, July 25, 2010 7:25 PM
Subject: Re: RotaxEngines-List: IDLE RPM
Damien,
Some have stated that 1400 is OK, but I get way too much "chatter" in
my gear box at that rpm, and I know that is not good for the gears in
the gear box. I set my idle speed at 1800 because that is where my
engine idles best. Some set theirs at 1600. I would recommend an idle
speed in the range of 1700 to 1800 rpm.
Hugh McKay
Allegro 2000
Rotax 912 UL
380 hours
From: Damien
Sent: Sunday, July 25, 2010 8:48 AM
To: rotaxengines-list@matronics.com
Subject: RotaxEngines-List: IDLE RPM
Hello. I need to set the idle speed on my Rotax 912 80HP. The
maintenence manual states
that the idle speed should be 1400 RPM. I have a mechanic friend who
feels that would be too low. He is
concerned about the gearbox. Any comments ?
Damien
Zodiac 601 HDS
href="http://www.matronics.com/Navigator?RotaxEngines-List">http://www.
matronics.com/Navigator?RotaxEngines-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
Message 5
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Check a recent manual and or (preferably both) Rotax Bulletins.
Years ago idle was 1400 nominal. Field experience changed
recommended setting to1800-2200 or thereabouts
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=306242#306242
Message 6
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Hi Damien,
You can set the 80 hp rpm a little lower than the 100 hp Rotax because the compression
is lower on the 80 hp. If you set the rpm too low on the 100 hp you start
to bang away at your gearbox and it's the same for the 80 hp. Yes it will
fly, but you will be doing a gearbox rebuild later as you build some hours. The
80 hp is better off for the gearbox sake at 1700-1800 rpm at idle. With the
lower 80 hp compression you can get away with 1700 rpm for idle. 1400 rpm is just
too low. I have a very slippery Flight Design CT and I can set in down in
1000' at 2800 rpm. So if someone says you can't set down a high drag aircraft
at 1700-1800 rpm then I would have to say it's time for more training or more
precision flying. I know I can do mine at 2800 because the guys in the UK challenged
me. I typically leave some throttle in right to touchdown. makes landings
smooth all the time. They said they had to be at 1500 rpm to land. It's all
technique and not always what we want to blame it on.
So I agree with Hugh and your mechanic.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=306244#306244
Message 7
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Thanks for all the helpful responses.
Regards,
Damien
DO NOT ARCHIVE
----- Original Message -----
From: Damien
To: rotaxengines-list@matronics.com
Sent: Sunday, July 25, 2010 8:48 AM
Subject: RotaxEngines-List: IDLE RPM
Hello. I need to set the idle speed on my Rotax 912 80HP. The
maintenence manual states
that the idle speed should be 1400 RPM. I have a mechanic friend who
feels that would be too low. He is
concerned about the gearbox. Any comments ?
Damien
Zodiac 601 HDS
Message 8
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Brake pads are cheaper than gearboxes.
Joel
--- On Sun, 7/25/10, Roger Lee <ssadiver1@yahoo.com> wrote:
From: Roger Lee <ssadiver1@yahoo.com>
Subject: RotaxEngines-List: Re: IDLE RPM
Hi Damien,
You can set the 80 hp rpm a little lower than the 100 hp Rotax because the
compression is lower on the 80 hp. If you set the rpm too low on the 100 hp
you start to bang away at your gearbox and it's the same for the 80 hp. Ye
s it will fly, but you will be doing a gearbox rebuild later as you build s
ome hours. The 80 hp is better off for the gearbox sake at 1700-1800 rpm at
idle. With the lower 80 hp compression you can get away with 1700 rpm for
idle. 1400 rpm is just too low. I have a very slippery Flight Design CT and
I can set in down in 1000' at 2800 rpm. So if someone says you can't set d
own a high drag aircraft at 1700-1800 rpm then I would have to say it's tim
e for more training or more precision flying. I know I can do mine at 2800
because the guys in the UK challenged me. I typically leave some throttle i
n right to touchdown. makes landings smooth all the time. They said they ha
d to be at 1500 rpm to land. It's all technique and not always what
we want to blame it o!
n.
So I agree with Hugh and your mechanic.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=306244#306244
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