| Good morning! Couldn’t sleep so doing some work in bed (laptops - a brilliant curse). I get the restriction, and wondered about the pressure on the fan at cruise speeds when rpm tries to imitate a turbo!
Steve
Yep, what are doing out of bed??? Also to add, if the fan is
not going it will cause restriction to the incoming air and work
against the cooling set up. Fans are very complicated. Neil.
On 11/16/2016 8:53 AM, Stephen Izett
wrote:
Is that you, Mr Unger?
Steve
Steve, forget the fan idea. It sounds
simple but to be effective it has to move enough air
to duplicate you almost flying. Would guess 3 hp min.
not enough space and too complicated. The another
thing to go wrong. Get the ducting right will be
much simpler. Neil.
On 11/16/2016 8:23 AM,
Stephen Izett wrote:
Hi Bill
At this point there are no cowl flaps. I
tried to create some space for them should we need
to increase exit volume.
I think I'd be really happy with those
temps.
The cowl exits are ramps. When the front
gear is down there is significantly more exit area.
There is about 36in2 of exit area (Gear
door closed).
Inlet area is currently 17in2 (right
cheek) feeding water exchanger and 7in2 (lower round
intake) feeding oil cooler. 7in2 of Left cheek feeds
air into the filter / throttle body, leaving about
10in2 of the left cheek blanked off at present.
The Prop is a second hand electric
adjustable from New Zealand. They are no longer
available. Its performance is unknown at this stage.
The design was taken over by Phil at www.sprintaero.com .
Have you heard of anyone using electric
fans for on the ground running?
Cheers
Steve Izett
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Steve,
You
could try using SCAT ducting
to route any unused inlets
over to the water to improve
the volume of air. What do
your cowl exits look like?
In
order to really know how
everything is working you are
going to have to fly. It will
be difficult to do a full
power takeoff and then go into
high speed cruise and have the
cooling work perfectly for
both conditions unless you
have cowl flaps or some manner
of controlling the air. I
currently accept 210-220 on
takeoff in order to get
180-190 in cruise.
That
plane is going to be fast! It
looks like 200K just sitting
in the hangar!
What
prop is that?
Bill
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Tuesday, November 15, 2016 3:13 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Cooling
Hi there Bill.
The
water exchanger is
~540 cubic inch in
capacity and fed from
the right cheek via a
rotating trumpet
shaped diffuser which
in turn feeds a wedge.
The oil exchanger is a
turbo RX7 unit of 190
cubic inch capacity
and fed via a
trumpet/wedge diffuser
fed from below the
spinner.
I’ll send some
pictures separately as
they are together to
large.
Steve,
Can you share any
photos of your cooling
install? Oil and
water.
Bill
-----Original
Message-----
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Monday, November
14, 2016 4:21 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary]
Cooling
Hi guys.
The Glasair SIIRG is
near completion and we
are taxi testing.
The OAT is rising as
we enter summer.
Yesterday was 37C ~
100F.
She can idle forever
with water stabilising
below 220F and oil
below 180F if
the OAT is below 70F
but not sure yet about
the warmer days.
I'm wondering about 3
options and would
value your experience
and thoughts:
1. Route some more air
from the left cheek
into the water heat
exchange
diffuser currently fed
by the right cheek. I
am currently only
using 50% of
the left cheek
(Blanked off). The
other 50% of the left
cheek feeds air to
the engine. The air is
likely not to want to
do the gymnastics
required to
travel the path
available.
2. Install another
small core fed by the
available left cheek
air with water
from the heater
outlet. This would
make for easy plumping
as far as the
water system. I'm not
sure how much heat we
could reject from that
small
diameter heater
outlet?
3. Install an electric
fan on the main
exchanger for extended
on the ground
running. Main concern
with fan is, what
happens when cruising
at up to
200Knots?
Appreciate you
feedback
Steve Izett
Glasair SIIRG Genesis
4 port RD1C EC2
Perth Western
Australia
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