=?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
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