Today's Message Index:
----------------------
1. 06:29 AM - Re: Hi and ADSB-Out in my Europa (Area-51)
2. 11:44 AM - Re: Hi and ADSB-Out in my Europa (n7188u)
3. 03:13 PM - Re: Re: Hi and ADSB-Out in my Europa (Peter Z)
Message 1
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| Subject: | Re: Hi and ADSB-Out in my Europa |
FWIW 181's 80hp touches 120kt IAS at 5200rpm WOT on a 3 blade Bolly set to 19deg
blade angle. I'd be happy with 135kt cruise on 24 MAP
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513580#513580
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| Subject: | Re: Hi and ADSB-Out in my Europa |
OK, so in the interest of accurateness, I went up this morning when it was relatively
calm and did 3 and 4 leg runs and used the very handy National Test Pilot
School (NTPS) GPS Pitot-Static-Error spreadsheet to calculate Vtrue and the
results are not quite as optimistic as my previous quick estimate but not too
bad anyway. I include the output from the spreadsheet so you can look at it there.
As a summary, I normally plan for 130 knots true at 5100 RPM at 4500-5500 feet
as I mentioned. The check this morning shows that at 5100 I get 127 knots at 3000'
and 128 knots at 4500' (MP 23.5 and 22.5 respectively). At 5200 RPM the speeds
do go up to 129 knots at 3000' and 130 knots at 4500' (MP 24 and 23 respectively).
I looked at measurements I took in 2021 with the same prop with a little more pitch
and the speed kit (which I still have to paint and re-install) and I was
getting 135 knots true at 4200' and 5100-5200 rpm. I reduced the pitch slightly
which did make me loose some of this speed, but I like the takeoff performance
better now, although it wasn't that bad before. I could get about the same
climb with both finer and coarser pitch but the transition from 60 knots to 110
knots used to be a little sluggish and the RPM would drop to max torque at 4900
RPM. Now it stays at 5100+ RPM, the ground run is much shorter and no longer
do I experience sluggishness when I retract the flaps and accelerate to cruise
climb speed. It just feels better.
Overall, I am very pleased with this engine/prop combination and the current setup.
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=513581#513581
Attachments:
http://forums.matronics.com//files/240512_n11eu_true_airspeed_505.png
Message 3
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| Subject: | Re: Hi and ADSB-Out in my Europa |
Thx for that Chris!
When I have time I will attempt the same to compare with my eprop.
Cheers!
Pete
> On May 12, 2024, at 2:52PM, n7188u <chmgarb@gmail.com> wrote:
>
>
> OK, so in the interest of accurateness, I went up this morning when it was relatively
calm and did 3 and 4 leg runs and used the very handy National Test Pilot
School (NTPS) GPS Pitot-Static-Error spreadsheet to calculate Vtrue and the
results are not quite as optimistic as my previous quick estimate but not too
bad anyway. I include the output from the spreadsheet so you can look at it
there.
>
> As a summary, I normally plan for 130 knots true at 5100 RPM at 4500-5500 feet
as I mentioned. The check this morning shows that at 5100 I get 127 knots at
3000' and 128 knots at 4500' (MP 23.5 and 22.5 respectively). At 5200 RPM the
speeds do go up to 129 knots at 3000' and 130 knots at 4500' (MP 24 and 23 respectively).
>
> I looked at measurements I took in 2021 with the same prop with a little more
pitch and the speed kit (which I still have to paint and re-install) and I was
getting 135 knots true at 4200' and 5100-5200 rpm. I reduced the pitch slightly
which did make me loose some of this speed, but I like the takeoff performance
better now, although it wasn't that bad before. I could get about the same
climb with both finer and coarser pitch but the transition from 60 knots to
110 knots used to be a little sluggish and the RPM would drop to max torque at
4900 RPM. Now it stays at 5100+ RPM, the ground run is much shorter and no longer
do I experience sluggishness when I retract the flaps and accelerate to cruise
climb speed. It just feels better.
>
> Overall, I am very pleased with this engine/prop combination and the current
setup.
>
> Chris
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=513581#513581
>
>
>
>
> Attachments:
>
> http://forums.matronics.com//files/240512_n11eu_true_airspeed_505.png
>
>
>
>
>
>
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