First paragraph and some changes went unsent for some reason, probably beca
use I was late for supper and hit send instead of save. Extra info added b
elow.
Bud
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s 10
From: Bud Yerly<mailto:budyerly@msn.com>
Sent: Sunday, April 22, 2018 6:37 PM
Subject: RE: Europa-List: Europa Trigear with Rotax 914 running out of stea
m at FL200?
Roland,
12AY has a trigear speed kit, has a fairly smooth finish, a stock 914 early
version with the old TCU (at the time), no intercooler or modifications.
Equipped with OAT, Fuel Flow, Fuel pressure, MP, EGT and the standard press
ure and temp instruments, I am pretty sure of the instrumentation and I kno
w that my TCU was showing some Temp cutback due to the high OAT (it was 5C
at 18K). My TCU at the time was the early 4.3 and my Temp sensor in the Ai
rbox was the old style. Sea level max MP was 34. Prop pitch was set at fi
ne of 5650 at sea level. Course pitch was 30 degrees and one could dive at
Vne and the prop would hold 5000 or cruise at max speed limit. The normal
check on tests for me is a 1000 MSL check at 5500 RPM. My 914 with the wa
rp drive blades on my Airmaster would do 137 KIAS with the old TCU. Note,
I upgraded my TCU and put on two new carbs in 2016 and have been happy with
the balance, TCU ops and the fact it is easier to monitor the TCU and engi
ne performance with a laptop.
First on the prop:
Any club of a prop blade on a Europa with a 914 will go to 20,000 and hold
altitude at 5000 RPM. Even at very high OATs I tested at in Florida in Jul
y of 2015.
Back with my old TCU and carbs with some carb problems I did the following
with a 64 inch Warp Drive on an Airmaster:
At my 100% stop at 31 inches and 5500 RPM I indicated at 18K 118KIAS and ab
out 160 KTAS with a warp drive FF 6.7.
Pulled back to 5000 RPM and 28 inches I indicated 105 at 140KTAS FF in the
6.2 range.
Fuel flows you give are suspect. The fact you have no Fuel Pressure, OAT an
d MP reported, I believe you should make sure your engine is doing as adver
tised. If you have no speed kit, that may be a bit of a problems as the Eu
ropa trigear without a well done speed kit is a dog.
If I can maintain 100 KIAS up to 18K with 4800 and 28 inches, (I=92ve done
it a few times loafing around) I suspect your plane should also. The Whirl
wind and Sensenich blades are better than the Warp Drives but as I said abo
ve, any club of a prop can do 20,000 and stay above 100 KIAS even that high
... Eric Trombley has a 60 inch Warp Drive blade on his mono and can easil
y cruise that high.
Regards,
Bud Yerly
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From: owner-europa-list-server@matronics.com <owner-europa-list-server@matr
onics.com> on behalf of Roland <schmidtroland@web.de>
Sent: Thursday, April 19, 2018 8:44:09 AM
Subject: Europa-List: Europa Trigear with Rotax 914 running out of steam at
FL200?
Hi Europa Folks,
maybe some of you (especially in the US?) with a Rotax 914-powered Trigear
can help me evaluate the high altitude performance of my bird.
It is an XS TG 914 (no Intercooler) with Airmaster CS-prop. On two flights
yesterday (DA around 20.000 ft - ISA+10=C2=B0C) at a mass of around 560kg (
1235lbs) my Europa did 105KIAS at WOT and 5500RPM (I have no MP-gauge). Alt
hough still climbing with around 500FPM at 75KIAS I instantly loose altitud
e when transiting to Level flight and handling feels quite a bit "spongy".
Erich Trombley posted a picture of his EFIS schowing 126KIAS with his Mono
N28ET at a DA of 19500ft at 5310RPM.
The fuel consumption up there was only about 21 l/h (5,5 GPH), so that my a
ssumption is simply, that the 914 can't deliver the appropriate power for t
he heavier and more draggy Trigear for better performance.
At FL100 at MCP and a FF of 26 l/h (7 GPH) I see 130KIAS.
Any idea what to expect up there at FL200?
Regards
Roland
PH-ZTI
XS TG 914
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