Griffo,
Now that I flown the airplane a little more I can provide additional info. The
RPM does stay somewhat constant at between 5200-5400 in my plane during initial
climb (around 60 kias). As I retract the flaps and increase speed to around
80 kias the RPM will go up I think around 200-300 rpm but at that point I am
throttling
back because the climb rate and deck angle are a little steep for my
taste at this point in flight testing.
Is the tach accurate? don't know. You got me curious so I will check. But the
blade
angle is set to what is recommended for this prop and the 912 ULS (17.5)
so it shouldn't be too far off. The SportCruiser LSA uses this prop with the 912
ULS and the manual calls for 5000100 RPM during static RPM test so I don't
think my tach is off.
Props are not all created the same. I remember reading some Europa docs that
said
the warp drive tended to have a lower RPM than static as the airplane starts
to move as the prop starts to "bite" better (I tried to find it to provide as
refence but couldn't find it). I think the DUC propellers claim a similar
effect.
In my LongEZ it is the "normal" way, I get around 2200 static and then 2500
as soon as I start the takeoff roll. It's a big change.
Take all I said with a grain of salt. It is based on my observations and what I
remember reading (if I find where I read the info from Europa about the Warp
drive props I'lll post it).
Best Regards,
Chris
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