Today's Message Index:
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1. 05:44 AM - Europa Trigear with Rotax 914 running out of steam at FL200? (Roland)
2. 06:16 AM - Re: Europa Trigear with Rotax 914 running out of steam at =?UTF-8?Q?FL=32=30=30=3F? (davidjoyce@doctors.org.uk)
3. 07:02 AM - Re: Europa Trigear with Rotax 914 running out of steam at FL200 (Roland)
4. 08:43 AM - Re: Europa Trigear with Rotax 914 running out of steam at FL200 (rampil)
5. 01:33 PM - Re: Europa Trigear with Rotax 914 running out of steam at FL200 (Roland)
Message 1
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| Subject: | 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+10C) at a mass of around 560kg (1235lbs) my Europa
did 105KIAS at WOT and 5500RPM (I have no MP-gauge). Although still climbing
with around 500FPM at 75KIAS I instantly loose altitude 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 assumption
is simply, that the 914 can't deliver the appropriate power for the 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
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479436#479436
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| Subject: | Re: Europa Trigear with Rotax 914 running out of steam at |
=?UTF-8?Q?FL=32=30=30=3F?
Roland, If you had 5500 rpm at just over 20 litres per hour you were
clearly not usung full power which from memory consumes something fairly
close to 40 litres/ hr. That all suggests that your propeller is not
'man enough' for the thin air at 20,000 ft. That comes as no surprise to
me as my previous Woodcomp SR3000W prop set to achieve 5650rpm max
static at ground level, and a respectable climb rate if stuck in max
course pitch (also at low altitude) would overspeed at 10,000ft if I
applied 100% power, and also incidentally exceed Vne TAS. There are two
questions that spring to mind: Why would you want to be up at 20,000 ft?
And why not have a manifold pressure gauge, which the LAA among others
consider an important aid to 914 engine management?
Regards, David Joyce, GXSDJ
On 2018-04-19 13:44, Roland wrote:
>
> 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+10C) at a mass of around 560kg (1235lbs) my
Europa did 105KIAS at WOT and 5500RPM (I have no MP-gauge). Although still climbing
with around 500FPM at 75KIAS I instantly loose altitude 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 assumption
is simply, that the 914 can't deliver the appropriate power for the 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
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=479436#479436 [1]
>
Links:
------
[1] http://forums.matronics.com/viewtopic.php?p=479436#479436
[2] http://www.matronics.com/Navigator?Europa-List
[3] http://forums.matronics.com
[4] http://wiki.matronics.com
[5] http://www.matronics.com/contribution
Message 3
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| Subject: | Re: Europa Trigear with Rotax 914 running out of steam at |
FL200
Hi David,
I think the prop (broad blades)is quite okay for the job as it's easy capable of
holding 5500RPM at full throttle.
The 914 delivers 100HP (MCP) up to 16000ft. Why fly up there? Well, it's more economical
with the Turbo and sometimes you can make use of favourable tailwinds.
Of course you are correct in suggesting a MP-gauge - I'm thinking of replacing
the VDO boost pressure gauge for it.
Thanks and regards
Roland
PH-ZTI
XS TG 914
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479438#479438
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| Subject: | Re: Europa Trigear with Rotax 914 running out of steam at |
FL200
Is there a reason you are reporting Kias?
TAS is a more rational measurement for
those altitudes for performance and comparison.
Remember KIAS falls with altitude and TAS increases
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479439#479439
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| Subject: | Re: Europa Trigear with Rotax 914 running out of steam at |
FL200
Hello Ira,
my setup is still lacking an OAT-gauge, thus no TAS-indication on the EFIS. KIAS
is just what I read on the ASI. 105 KIAS result in about 148 KTAS at 20500 ft
DA.
A fuelburn of 5,5 GPH pretty much match with 75% power of the 914. That's about
what is left at that altitude. Plenty for the sleek Mono, but just about enough
for the heavier and draggy Trigear.
Regards
Roland
PH-ZTI
XS TG 914
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479449#479449
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