Today's Message Index:
----------------------
1. 05:35 AM - Re: Rotax 912-S Users, What RPM do you look for on takeoff ? (Thom Riddle)
2. 06:28 AM - Re: Rotax 912-S Users, What RPM do you look for on takeoff ? (John Hauck)
3. 08:54 AM - Re: Best Oil Filter for the 912 (Thom Riddle)
4. 09:03 AM - Re: Re: Rotax 912-S Users, What RPM do you look for on takeoff ? (Robert Laird)
5. 09:12 AM - Re: Rotax 912-S Users, What RPM do you look for on takeoff ? (Thom Riddle)
6. 01:28 PM - Re: Best Oil Filter for the 912 (JetPilot)
7. 05:14 PM - Prop Pitch... (David Lehman)
8. 05:21 PM - Re: Best Oil Filter for the 912 (Roger Lee)
9. 05:29 PM - Re: Prop Pitch... (HShack@aol.com)
10. 06:14 PM - Re: Prop Pitch... (Larry Cottrell)
11. 06:51 PM - Re: Prop Pitch... (Wayne T. McCullough)
12. 07:36 PM - Re: Prop Pitch... (David Lehman)
13. 07:38 PM - Re: Prop Pitch... (David Lehman)
14. 07:43 PM - Re: Prop Pitch... (Wayne T. McCullough)
15. 07:52 PM - Re: Full enclosure (planecrazzzy)
Message 1
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| Subject: | Re: Rotax 912-S Users, What RPM do you look for on takeoff |
?
Jet Pilot,
I have my 912UL prop pitched so that I get 5,500 RPM at full throttle
in straight and level cruise configuration. With this prop and engine
combination I get only about 4950 rpm static on the ground and about
4800-4850 at full throttle at Vy climb speed. This is the best pitch
setting for maximum cruise performance. If you want better climb,
decrease the pitch a bit (get higher rpm static and climb). This will
of course put your full throttle in straight and level rpm up higher. I
would never pitch it such that you get more than 5800 rpm in full
throttle straight and level flight, but you can if you want to.
As was stated in some recent posts, stresses on reciprocating engine
parts go up dramatically with increase in engine rpm, so life of an
engine at a constantly higher rpm will probably be affected.
Thom in Buffalo
do not archive
Message 2
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| Subject: | Re: Rotax 912-S Users, What RPM do you look for on takeoff |
?
Good Morning:
I don't think Thom is flying a MKIII, so his take off rpm is not going to be the
same as what I see.
I prop my MKIII same same Thom, 5500 rpm straight and level. Gives me best take
off, climb, and cruise.
Prop it 5400 static.
Will see 5200 to 5300 rpm on climb, depending on air temp.
A few feet after the MKIII begins its takeoff roll, like 10 to 20 feet, rpm will
be pulled from 5400 down to 5300.
Flying a 912ULS slowly will not increase service life. If anything, it will shorten
it. This engine is designed to cruise at 5500 rpm max continuous. The
manufacturer would not publish these numbers if they thought it would shorten
the 912ULS's life. I normally cruise 5000 to 5200 rpm. Many flights over the
Rockies have seen wide open throttle for several hours as we climb to 15,000
feet to get across the mountains.
If you fly with an inflight adjustable prop you can takeoff at 5800 rpm, climb
for 5 minutes at 5800 rpm, then pull it back to 5500 rpm for cruise. However,
it is noisier and the MKIII rougher riding at those speeds. 5000 is much quieter.
Take care,
jhauck
mkIII
PS: Another very important point is, the 912 series engines need at least 190F
oil temp to burn off moisture and contaminants in the oil. You will not see
this by flying less than 5,000 rpm. Also, slow flight will not keep the engine
clean. When I fly local area for a while, the engine is starting to get carboned
up and dirty. Usually, after the first day or two of a long cross country
flight I can tell she is getting cleaned up by the sound, feel, and performance
of the little 912ULS. I like to keep her happy.
--------
John Hauck
MKIII/912ULS
hauck's holler, alabama
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=84455#84455
Message 3
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| Subject: | Re: Best Oil Filter for the 912 |
Jet Pilot,
According to Purolator's website, Advance Auto Parts, Sears, PepBoys
among others carry Purolator Filters.
Thom in Buffalo
do not archive
Message 4
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| Subject: | Re: Rotax 912-S Users, What RPM do you look for on takeoff |
?
I'll second what John is saying -- no surprise there since he's my 912S
mentor!
On take off, I get to about 5350 rpm... with 1-up, I cruise between 4950 and
5200 rpm, all day long, depending on how fast I want to go.
-- Robert
MkIIIc w/912S
On 12/30/06, John Hauck <jhauck@elmore.rr.com> wrote:
>
>
> Good Morning:
>
> I don't think Thom is flying a MKIII, so his take off rpm is not going to
> be the same as what I see.
>
> I prop my MKIII same same Thom, 5500 rpm straight and level. Gives me
> best take off, climb, and cruise.
>
> Prop it 5400 static.
>
> Will see 5200 to 5300 rpm on climb, depending on air temp.
>
> A few feet after the MKIII begins its takeoff roll, like 10 to 20 feet,
> rpm will be pulled from 5400 down to 5300.
>
> Flying a 912ULS slowly will not increase service life. If anything, it
> will shorten it. This engine is designed to cruise at 5500 rpm max
> continuous. The manufacturer would not publish these numbers if they
> thought it would shorten the 912ULS's life. I normally cruise 5000 to 5200
> rpm. Many flights over the Rockies have seen wide open throttle for several
> hours as we climb to 15,000 feet to get across the mountains.
>
> If you fly with an inflight adjustable prop you can takeoff at 5800 rpm,
> climb for 5 minutes at 5800 rpm, then pull it back to 5500 rpm for
> cruise. However, it is noisier and the MKIII rougher riding at those
> speeds. 5000 is much quieter.
>
> Take care,
>
> jhauck
> mkIII
>
> PS: Another very important point is, the 912 series engines need at least
> 190F oil temp to burn off moisture and contaminants in the oil. You will
> not see this by flying less than 5,000 rpm. Also, slow flight will not keep
> the engine clean. When I fly local area for a while, the engine is starting
> to get carboned up and dirty. Usually, after the first day or two of a long
> cross country flight I can tell she is getting cleaned up by the sound,
> feel, and performance of the little 912ULS. I like to keep her happy.
>
> --------
> John Hauck
> MKIII/912ULS
> hauck's holler, alabama
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=84455#84455
>
>
Message 5
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| Subject: | Re: Rotax 912-S Users, What RPM do you look for on takeoff |
?
John Hauck,
You are correct that I'm not flying a MkIII. You are also correct in stating RPM
that results from a 5,500 rpm full throttle s&l cruise pitch will differ between
airplanes. It will aslo differ between the same airplane with different props.
The Warp Drive with tapered tips (as I think you have on yours) has a reportedly
higher static and climb (Vy) rpm than other props when pitched for 5,500
rpm full throttle S&L flight.
As you know it is a try and test and try again until you get what is right for
your particular airplane/engine/prop combination. I would guess that your starting
point rpm recommendation of 5400 static is probably much closer to what he
needs than what my airplane requires for the same max cruise rpm. My point was
that ultimately the 5,500 rpm full throttle in cruise is a good target rpm
(not the only one of course) that will most likely take a few tries before getting
it right.
do not archive
--------
Thom in Buffalo
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=84487#84487
Message 6
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| Subject: | Re: Best Oil Filter for the 912 |
Hi Roger
Talking about Fram filters, I always use them in my car as they sell some High
end filters also. Did you consider or get information on the Higher End fram
filters like the Extended Guard ?
Im wondering how the more expensive Fram Extended Guard with the metal mesh, etc.
etc. would compare against the Tough Gaurd and the Purolater ?
JettPilot
--------
"NO FEAR" - If you have no fear you did not go as fast as you could
have !!!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=84532#84532
Message 7
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I borrowed a 66" 3 blade Warp Drive prop to try on my 503 DCDI original
Firestar... I have to assemble it tonight... How many degrees of pitch
should I start with?...
Thanx...
DVD
do not archive
Message 8
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| Subject: | Re: Best Oil Filter for the 912 |
Hi Jetpilot,
Believe it or not the Fram Tough Guard was rated higher than the Extra Guard. If
I remember right the Extra Guard has TFE which was what people used to put in
stuff like Slick 50 (just teflon). Most people agree now that you should not
use that in your engines and no real evidence supports any benifits.
Some people will quote a filter as being able to filter, let's say 10 microns.
This does not really mean a whole lot unless you quantify it with an effiency
rating, i.e. 10 microns at 80%, then larger particles get through the other 20%.
Different filters have different effiency ratings. The Tough Guard has a metal
mesh screen filtration if the safety bypass were to open.
The Tough Guard and the others are good average filters, but the Pure One is better.
Better medium and effientcy rating.
Hope this helps.
--------
Roger Lee
Tucson, Az.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=84572#84572
Message 9
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| Subject: | Re: Prop Pitch... |
In a message dated 12/30/2006 8:14:52 PM Eastern Standard Time,
david@davidlehman.net writes:
I borrowed a 66" 3 blade Warp Drive prop to try on my 503 DCDI original
Firestar... I have to assemble it tonight... How many degrees of pitch should
I
start with?...
Man........I hope you have a "C" or "E" box.............
Howard Shackleford
FS II
SC
Message 10
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| Subject: | Re: Prop Pitch... |
I have a two blade and it is set for 9 degrees.
Larry, Oregon
----- Original Message -----
From: David Lehman
To: kolb-list@matronics.com
Sent: Saturday, December 30, 2006 6:13 PM
Subject: Kolb-List: Prop Pitch...
I borrowed a 66" 3 blade Warp Drive prop to try on my 503 DCDI
original Firestar... I have to assemble it tonight... How many degrees
of pitch should I start with?...
Thanx...
DVD
do not archive
Message 11
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| Subject: | Re: Prop Pitch... |
We have installed a 3 blade warp drive on a Rans S-14 clipped wing in
the last 2 weeks.....We started at 10 degrees.....66 inch prop on a C
box.......
Flew it today using Tiny Tach for reading of rpms......Climb out at 6150
rpms.....Chart shows do not exceed 6500 for a DCDI 503...
Have never had a Tiny Tach fail me for reading (most important for
setting pitch). Sweeping gauges do lie........went through 4 on my
T-bird last year....
You have to tweak each setup to get the rpms for climbout........Two
strokes must NOT get behind in the power band.....
Next, an Avid Flyer to troubleshoot.. (came in yesterday from Tyler,
Texas on a trailer)......Sometimes I hate being the president of the
club, but I cannot let my friends fly stupidly either......Now , back to
my Kolbra.....
WT in Springfield, GA
Message 12
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| Subject: | Re: Prop Pitch... |
Nope, it's a "B"... I've read the concerns about using a Warp Drive on a
"B" box, but it's quite common around here and no one reports any
problems...
It's a borrowed prop and I just want to see what kind of difference(s) I get
using it vs my Tennessee woody...
DVD
do not archive
On 12/30/06, HShack@aol.com <HShack@aol.com> wrote:
>
> In a message dated 12/30/2006 8:14:52 PM Eastern Standard Time,
> david@davidlehman.net writes:
>
> I borrowed a 66" 3 blade Warp Drive prop to try on my 503 DCDI original
> Firestar... I have to assemble it tonight... How many degrees of pitch
> should I start with?...
>
>
> Man........I hope you have a "C" or "E" box.............
>
> Howard Shackleford
> FS II
> SC
>
Message 13
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| Subject: | Re: Prop Pitch... |
Wayne and Larry, thanx for the replies...
I'm going to use a handheld tach checker at various RPMs to cross check my
tach...
DVD
do not archive
On 12/30/06, Wayne T. McCullough <blackbird754@alltel.net> wrote:
>
> We have installed a 3 blade warp drive on a Rans S-14 clipped wing in the
> last 2 weeks.....We started at 10 degrees.....66 inch prop on a C box.......
>
>
> Flew it today using Tiny Tach for reading of rpms......Climb out at 6150
> rpms.....Chart shows do not exceed 6500 for a DCDI 503...
> Have never had a Tiny Tach fail me for reading (most important for setting
> pitch). Sweeping gauges do lie........went through 4 on my T-bird last
> year....
>
>
> You have to tweak each setup to get the rpms for climbout........Two
> strokes must NOT get behind in the power band.....
>
> Next, an Avid Flyer to troubleshoot.. (came in yesterday from Tyler, Texas
> on a trailer)......Sometimes I hate being the president of the club, but I
> cannot let my friends fly stupidly either......Now , back to my Kolbra.....
>
>
> WT in Springfield, GA
>
>
Message 14
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| Subject: | Re: Prop Pitch... |
I stand corrected.....The Rans uses a "B" Box....................
Wayne
Message 15
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| Subject: | Re: Full enclosure |
Hey guys,
Got a new update on the progress...
http://wingsforum.com/viewtopic.php?p=4962#4962
Slow but sure....
Gotta Fly...
Mike in MN
--------
.
.
.
.
.
Do Not Archive
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