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Re: Europa-List: Performance of 80HP compared to 100HP Rotax

Subject: Re: Europa-List: Performance of 80HP compared to 100HP Rotax
From: Pete Lawless <pete@lawless.info>
Date: Sun, 13 Jan 2019 15:32:05
Will

We have the LAA to consider!

Pete

On 13/01/2019 13:40, William Daniell wrote:
> Why not fit a manual turbo to your 80hp. Then youd have power when 
> you need it. Total cost about usd 5k.
> Will
>
> On Sun, Jan 13, 2019, 05:24 Pete Lawless <pete@lawless.info 
> <mailto:pete@lawless.info> wrote:
>
>     <mailto:pete@lawless.info>>
>
>     Graeme
>
>     I totally agree with Kingsley's appraisal. AC has the standard 912 UL
>     with a CAP 140 variable pitch prop. This allows me to get 5,600
>     rpm at
>     start of roll, so getting as much power as possible out of the
>     engine.
>     Acceleration and climb out are no problem. The only time I would like
>     more power is at max weight (1,300 lbs) on a hot, cross windy day, we
>     then get a closer look at the far hedge that I like. Initial
>     climb when
>     clean is around 800 to 1,000 fpm. Cruise is 120 kts at 14 to 15
>     litres
>     per hour, depending on weight. You can wind it up to 130 but the
>     fuel
>     consumption increases.
>
>     Just worth checking I seem to remember that when the weight
>     increase mod
>     to 1,370 lbs was introduced that the PFA would only approve it
>     with an
>     80 hp engine if using a variable pitch prop.
>
>     Pete
>     G-RMAC Classic mono #109
>
>
>     On 12/01/2019 23:49, Kingsley Hurst wrote:
>     > <kingsnjan@westnet.com.au <mailto:kingsnjan@westnet.com.au>>
>     >
>     > 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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