Today's Message Index:
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1. 01:03 AM - Re: Re: Cruise speed data for Monowheel with 912ULS (D McFadyean)
2. 03:04 AM - Re: Cruise speed data for Monowheel with 912ULS (JohnFrance)
3. 05:06 AM - Re: Re: Cruise speed data for Monowheel with 912ULS (D McFadyean)
4. 07:01 AM - Re: Re: Cruise speed data for Monowheel with 912ULS (Pete Jeffers)
5. 09:22 AM - Re: Cruise speed data for Monowheel with 912ULS (n7188u)
Message 1
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| Subject: | Re: Cruise speed data for Monowheel with 912ULS |
That would be a simple summary and allows access to a fuller potential of the engine.
But ignores the additional work that has been published recently; if you're
running 98 RON then you can do much what you like above 4000rpm. Possibly
until any further data is published, such as detail of any resonant bands. Roll-on
R3.
Duncan McF.
> On 25 April 2021 at 22:58 Griffo <scangriffin@bigpond.com.au> wrote:
>
>
>
> Soooo!
> After all that, the advice remains;
> For fixed pitch propellers (including ground adjust) - setting pitch to get
a minimum 5200 rpm Static - will give you 5200 rpm on initiating take off (WOT)
with the engine speed climbing as air speeds increases. Adjust climb angle
to keep engine rpm below red line.
> Cruise Climb & Cruise should be at a minimum of 5200 rpm.
> I a nut shell - Rotax 91 engines thrive on /love rpm - you are not doing them
any favours operating below the Rotax recommended engine speeds.
>
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> Read this topic online here:
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> http://forums.matronics.com/viewtopic.php?p=501517#501517
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| Subject: | Re: Cruise speed data for Monowheel with 912ULS |
Just out of interest, when I search for SL-912-016R1 I only find the 2016 version
even on the Rotax site. What am I missing?
Regarding propeller settings on my mono, WOT static is 5400 rpm, WOT at 3500 near
ISA conditions 5500 rpm, WOT climb @ 65 kts 5200. Cruise @28 MAP 135 kts and
5100 rpm using 20 ltr m/hr.
The consumption is higher than I would like so I am now throttling back to around
27,2 which is around 5000 rpm.
The propeller is a ground adjustable EProps V20 1,6m diameter.
I hope this is useful.
--------
Europa mono Nr 192
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=501520#501520
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| Subject: | Re: Cruise speed data for Monowheel with 912ULS |
https://www.flyrotax.com/services/technical-documentation.html
> On 26 April 2021 at 11:04 JohnFrance <77alembert@gmail.com> wrote:
>
>
>
> Just out of interest, when I search for SL-912-016R1 I only find the 2016 version
even on the Rotax site. What am I missing?
>
> Regarding propeller settings on my mono, WOT static is 5400 rpm, WOT at 3500
near ISA conditions 5500 rpm, WOT climb @ 65 kts 5200. Cruise @28 MAP 135 kts
and 5100 rpm using 20 ltr m/hr.
> The consumption is higher than I would like so I am now throttling back to around
27,2 which is around 5000 rpm.
> The propeller is a ground adjustable EProps V20 1,6m diameter.
>
> I hope this is useful.
>
> --------
> Europa mono Nr 192
>
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>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=501520#501520
>
>
>
>
>
>
>
>
>
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| Subject: | Re: Cruise speed data for Monowheel with 912ULS |
Hi Revision 1 of this service letter was published in 2016 and refers to amongst
others the 912 UL and 912 ULS. Revision 2 of the same SI was issued this year
and refers to amongst other Rotax engines to the 912ULS. Critically not to
the 912 US (80HP).
Perhaps this may help.
Pete
-----Original Message-----
From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-server@matronics.com] On Behalf Of JohnFrance
Sent: 26 April 2021 11:04
Subject: Europa-List: Re: Cruise speed data for Monowheel with 912ULS
Just out of interest, when I search for SL-912-016R1 I only find the 2016 version
even on the Rotax site. What am I missing?
Regarding propeller settings on my mono, WOT static is 5400 rpm, WOT at 3500 near
ISA conditions 5500 rpm, WOT climb @ 65 kts 5200. Cruise @28 MAP 135 kts and
5100 rpm using 20 ltr m/hr.
The consumption is higher than I would like so I am now throttling back to around
27,2 which is around 5000 rpm.
The propeller is a ground adjustable EProps V20 1,6m diameter.
I hope this is useful.
--------
Europa mono Nr 192
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=501520#501520
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Message 5
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| Subject: | Re: Cruise speed data for Monowheel with 912ULS |
I want to thank all of you that participated in this discussion. I personally have
to say I have learned a lot in the subject of operating a Europa with a GA
prop.
I think that of particular value has been all the data received regarding RPM/MAP
and speeds for the Europa monowheel.
The discovery of the latest Rotax SL-912-016 is of particular interest. I still
need to read this SL in detail but the chart presented is a total departure from
all the information presented in the past. If I interpret it correctly, with
RON 95, you have to be at 5500 RPM to be 100% sure you will not have a detonation
event at WOT. On the other hand, anything over 4000 RPM with RON 98 @ WOT
is safe.
In the usual Rotax way, it leaves you scratching your head but I welcome the change.
For now I decided to switch to premium 93 octane (US) straight E10 fuel.
I was using 50-50 ethanol free 90 and premium 93 but in light of this chart I
think the gain is safety, while I experiment with my prop, is huge if using the
higher grade gasoline.
But one set of data is of particular interest to me and would like to discuss further:
JohnFrance: Your claim of being able to cruise at 5100/28" at 135 kts (indicated?)
while still climb 5200/WOT at 65 kts is amazing and want to learn more. I
do have a DUC Swirl that makes similar claims and once I finish testing my Woodcomp
(which is not looking very impressive so far) I will try the DUC. But would
like to learn more about this EProps V20.
Great thread guys. this info is so important for those getting started with operating
a Europa. (my next topic will be fuels :) )
Best Regards,
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=501525#501525
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