Today's Message Index:
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0. 12:18 AM - Please Make a Contribution to Support Your Lists... (Matt Dralle)
1. 12:43 AM - 912uls and MAP (icrashrc)
2. 01:17 AM - Re: setting prop pitch (R Holder)
3. 02:35 AM - Re: 912uls and MAP (Graham Singleton)
4. 04:57 AM - Re: gear box insp. (Thom Riddle)
5. 06:17 AM - Re: gear box insp. (Roger Lee)
6. 06:30 AM - Re: gear box insp. (Thom Riddle)
7. 02:29 PM - Re: 912uls and MAP (rampil)
8. 02:41 PM - Re: gear box insp. (rampil)
9. 02:52 PM - FW: Re: Setting Prop pitch (gmail account)
10. 09:06 PM - Re: setting prop pitch (Roger Lee)
11. 09:13 PM - Re: gear box insp. (Roger Lee)
12. 11:12 PM - Re: setting prop pitch (Gtblu)
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| Subject: | Please Make a Contribution to Support Your Lists... |
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Message 1
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I've seen a few references to MAP while discussing a 912uls. How can a normally
aspirated engine have intake manifold pressure? Or are the references to MAP
something else? Thanks,
--------
Scott
www.ill-EagleAviation.com
do not archive
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=211997#211997
Message 2
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| Subject: | Re: setting prop pitch |
Roger Lee wrote:
> See the torque chart attached. (Top One) Max torque is
> 5000 rpm after that torque goes down and HP climbs.
> There is no magic here just the best compromise. Set
> your prop to get 5500 engine rpm at WOT in the air flat
> and level. At this setting you will have the best
> setting for you average pilot and plane. Most of us do
> not need special prop settings like maybe a float
> plane. This is not hard, don't make it hard. I have a
> Dynon system and have all the info.
Gawd. I have a Constant Speed prop. There is no "setting
the blade angle on the ground" !
Everything is different ! I don't
want to run at 80, 90 or 100% power, I want to run at 115
knots at the most efficient (least fuel) combination of
rpm and MAP.
115 knots is about 55 or 60% power. I cannot get that with
the throttle wide open, as the prop won't go that coarse.
I take your point that the more rpm the more friction in
the engine. Also the smaller the opening of the throttle
butterflies the more "throttling" of the air supply there is.
The test question was posed to get ACTUAL test results for
the different combination of rpm and MAP which each give
the same speed. If I had a fuel flow guage i would have
done it long ago.
This will give real figures; I am unsure about your "most
efficient at max torque" statement. And from your .doc
attachment max torque seems to be at 5100 !
Richard
Message 3
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| Subject: | Re: 912uls and MAP |
icrashrc wrote:
>
> I've seen a few references to MAP while discussing a 912uls. How can a normally
aspirated engine have intake manifold pressure? Or are the references to MAP
something else? Thanks,
>
> --------
> Scott
Scott
there is always pressure in the manifold but its usually less then
ambient atmospheric. No such thing as negative pressure btw, pressure is
either zero (vacuum) or positive.
Graham
Message 4
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| Subject: | Re: gear box insp. |
Bob,
I do periodic gearbox inspections. Just did one a couple weeks ago and it needed
new springs, otherwise it was in great shape. If you ship me the gearbox and
pay for return shipping I will do your inspection for $100 plus parts. If it
needs springs they are about $20 each. The gearbox with clutch uses three and
the one without uses two. If the springs are within new specs, you don't need
to change them, which is probably the case if you've been running mostly mogas.
If you want to fly your airplane here, we can turn it around in 1/2 day if no parts
are needed but we charge for gearbox removal and installastion too. Since
I am a certified power plant mechanic I can do the work on an SLSA.
Or you can send it to Lockwood. They will change the springs whether needed or
not.
http://riddletr.googlepages.com/a%26pmechanix
--------
Thom Riddle
CFI-SP
Power Plant Mechanic
N1208P RANS S6S, Tailwheel, 912UL
N197BG FS1/447
--------------------
Scratch any cynic, he said, and youll find a disappointed idealist.
George Carlin
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=212016#212016
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| Subject: | Re: gear box insp. |
Hi Thom,
Do you guys do overload clutch test/inspection?
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=212042#212042
Message 6
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| Subject: | Re: gear box insp. |
Roger,
We've not done one yet but I understand the process and am confident that we can
set up an engine brace/support jig for doing so. I spent most of my engineering
career doing machine design so this should be pretty straight forward. Since
each airplane type is a little different, it will require a slightly different
setup for each airplane type.
--------
Thom Riddle
CFI-SP
Power Plant Mechanic
N1208P RANS S6S, Tailwheel, 912UL
N197BG FS1/447
--------------------
Scratch any cynic, he said, and youll find a disappointed idealist.
George Carlin
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=212046#212046
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| Subject: | Re: 912uls and MAP |
When you drive a variable pitch prop, the MAP is the correlate of
engine power you you to control the throttle.
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=212151#212151
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| Subject: | Re: gear box insp. |
Re Gearbox inspection:
Hi Roger,
I dunno, but when I took Dean's Maintenance course at SnF 2006,
we took a gearbox apart with a bench press and couple of doodads
which I am too far away to look up at the moment. We inspected the
dogs, gears and seals. I don't remember a slipper in the box we
cracked open, but then my engine doesn't have one anyway ;)
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=212153#212153
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| Subject: | Re: FW: Re: Setting Prop pitch |
Hi Roger et al
Great thread!
Ive just put on a new Bolly Prop 3 blade to a STOL a/c T/O about 38kts and
max cruise about 75kts, and am currently straight and level WOT at desired
altitude with revs 5600. Because I want the STOL performance rather than
speed, does this sound ideal? Im wondering how much Ill lose of that
initial acceleration on take-off if I increase the pitch another degree.
I have had a borrowed wooden prop 2 blade for a while, and Im astounded how
much softer it is to fly. It seems to absorb the vibrations compared to the
compound props. Mind you even the wooden prop resonated at 4000 revs,
whereas the new Bolly doesnt.
Its a compromise.
Regards
Geoff Bell
Message 10
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| Subject: | Re: setting prop pitch |
Hi Geoff,
Balancing your flight characteristic needs.
You get a little better climb with 5600 and if you fly high (above 8K-11K) you
will have a little better performance. Other than that you might not notice a
big difference between 5600 and 5500 WOT prop adjustment. Just a little. You loose
a tiny bit of your top end too at 5600, but again only a small amount. You
are not supposed to run over 5500 for more that 5 min. To drop 100 rpm you might
only want to add back in about
.5-.75 degree. If you had two of your plane's and your plane was set to get 5600
and the other guy was set for 5500 you would most likely have to run a little
more rpm to keep up with him at a given flat and level cruise. You could out
climb the other guy and at 10K you would probably have a higher top end speed
at WOT.
If you are happy where your performance is right now then leave it alone. Each
setting in a props workable pitch range has its pros and cons. It is just a matter
of which flight characteristics you want. 5500 rpm just is a good all around
number for the best all around performance and keeps you in the Rotax specs
without ever giving it another thought.
It's all about balancing out you flight needs.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=212204#212204
Message 11
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| Subject: | Re: gear box insp. |
Hi Rampil,
We may be talking two different inspections. One is the overload clutch in the
engine and the other is the gear box. Two different critters. The gear box one
is easy. The overload clutch test can bend and tweak engine frames. Your talking
about the gear box and the other one mentioned above is the overload clutch
at 600 hours. The gear box is 800 hours with 100LL.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=212205#212205
Message 12
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| Subject: | Re: setting prop pitch |
Hi Roger,
Thanks for the info. My curiosity will get the better of me, so I will try a .5
addition, just to see.
Cheers
Geoff Bell
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=212208#212208
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