Hello Graeme,
I have a Mono Classic with the 912 80HP engine with 3 tapered Warp Drive
blades and an Airmaster CS hub.
Whilst I cannot directly compare the 80 HP 912 to the 100HP 912S, I can
say that I (along with others) am amazed how well it performs. The only
thing that would make me consider replacing it with the 100HP engine is
that part of flight between lift off and 90 kts. I am perfectly happy
with the ground run but after lift off in the high drag configuration
(flaps and gear down), 60 kts is about all I can get. I therefore
progressively start raising the gear/flaps very soon after lift off and
put them fully away at 60 kts. Climb rate at this time is minimal as it
fairly slowly accelerates. At 80 kts it starts to climb quite nicely
but by then I am well past the end of our 700m strip. (Exacerbating
this situation is the fact that we almost always have a cross wind) I
like to climb at 90 kts IAS and at AUW of 621 kg, I am astounded how
well it climbs to altitude averaging around 500 fpm and sometimes more
to 8,000 ft etc.
A mate of mine had a tri gear with the 80 HP engine and a fixed pitch
wooden propeller. It couldn't look at mine performance wise. I'm
therefore of the opinion a CS prop is a necessity with the 80 HP
especially in the hot conditions we have to endure over here.
I suppose this has told you very little Graeme but I wouldn't go to the
expense of purchasing a 912S without first trying the 912 you were
supplied. If need be, swapping them over is a very simple exercise once
you have forked out the $$$!!
Best regards
Kingsley in Oz
On 12.01.19 8:57 pm, graeme bird wrote:-
> I received an unused 80HP 912 with my recent part built kit with a thin three
blade warp drive; my own Europa is a 100HP 912ULS, can anyone comment on what
difference in performance I might expect. I recall on my previous plane, a C42,
the 80HP was less violent and more economical with marginal difference in
performance
but that might have been because it was cloth and draggy.
>
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