One of the Europa builders near to me has an unused 912 which he would like
to part with. This particular engine has the slipper clutch too.
Not sure what he wants for it, but I think 5k plus; but don`t quote me.
Let me know if thats of interest and I`ll put you in touch.
Duncan McFadyean
-----Original Message-----
From: Jerry Davis <lts@avnet.co.uk>
<europa@avnet.co.uk>
Date: Monday, March 06, 2000 8:52 AM
Subject: Re: Prop Settings
A little while ago there were several 912 engines available at low hours
---From Europa owners upgrading to the 912S. I would be interested to hear from
anybody who does have a low hours 912 for sale in the UK. I have a customer
who wants to take the second hand 912 route if the price is right.
Jerry
lts@avnet.co.uk
http://www.avnet.co.uk/touchdown
----- Original Message -----
From: Alan D Stewart
Subject: Re: Prop Settings
I concur with Jerry's email on prop settings. I'm not confident about prop.
ground clearance with a larger dia. though.
BWFX delivers around 5500 rpm (Flydat reading), straight and level at full
throttle, and returns around 133 knots true.
(GPS). Climb rate is good in winter and when light, and poor in summer at
AUW.
I'd always felt that I'd erred on the 'course' side, but in the light of the
discussion, and my own observation regarding
the climb/cruise compromise, I'm not so sure now.
I've just fitted the plenum mod to my standard 912 'classic' monowheel.
Static and climb RPM are higher. Initial indication are of an increase of
around 70 RPM.
to around 5080 RPM static and 4870, steady climb.
I never really noticed the drop off in revs. on a warm summers day.
However, if I'm ever stuck in the take off line at a busy airfield and have
spend 15 minutes at idle revs, awaiting authority
to depart, I'll feel more confident that the carbs are breathing air at
ambient and not at high, under cowl temperatures.
The climb rate may have improved, it's difficult to tell at this stage. I'll
know more by July !!
alan
----- Original Message -----
From: Jerry Davis
Subject: Re: Prop Settings
Ben
You didn't state your propeller type but I suspect its the standard
Warpdrive probably on the 912. The standard propeller is in my opinion too
small a diameter to give the best take off and climb on a Europa. Like all
things in life its a compromise. I have several customers now who have
fitted 64" props to their classic Europas and they report improved climb
without any great loss in cruise performance. When assessing cruise
performance I would not recommend simply recording the rpm as this gives no
real guide on power usage. You would have to also know the manifold pressure
or fuel consumption. I reckon that top speed is a good measure of
performance. An aircraft with a max straight and level speed of 135 kts
probably cruises more efficiently at 120 kts than an aircraft with a top
speed of 130 kts.
|