From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] RE [FlyRotary] first Flight of Glasair - finally
Date: Mon, 12 Aug 2019 20:45:38 +0800
References: <list-12840915@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Message-Id: <51F7528B-017A-4091-B523-96AAABA1275D@gmail.com>

Thanks Jeff
I've tried to seal the cowl as much as possible. The gear door is not =
very well sealed, but all the rest as pretty tight.
My concern is if the exit is not enough then the air will spill around =
the entry rather then getting to the exchangers.
I=E2=80=99ll keep you guys abreast of the testing.

Steve


> On 12 Aug 2019, at 8:17 pm, Jeff Whaley jwhaley@datacast.com =
<flyrotary@lancaironline.net> wrote:
>=20
> Congratulations Steve - a major milestone accomplished.
> A couple things: yes, the increase in airspeed will help : 110k - 150k =
is about 36%; will be interesting to see if your cooling follows in =
linear fashion.  Too much pressure in the cowl from an undersized outlet =
is highly unlikely - to over-pressurise (a balloon or tire) it takes =
both a sealed inlet and a seal outlet - the cowling will flow as much =
air as it can; the rest will simply never enter the openings.  On the =
other hand, if you have leaks into the cowling that are not part of your =
cooling ducts this DOES increase pressure under the cowling and will =
work against the low pressure area needed behind your heat exchangers.
> Good luck and keep up the posts as you move forward ... Jeff
>=20
> Hi People
>=20
> The Glasair has finally left the ground and had a successful first =
flight.
> I've attached a graph of the data. OAT was 63F
> I was really very pleased given our smallish 20in2 coolant inlet area =
and <9in2 oil inlet area for ~190hp.
> The temps are a bit hot (~220F) but we didn't go beyond 110 knots. I =
suspect when we get the airspeed up above 150knots into her nose we'll =
see some improvement.
> My hunch is we might have too much pressure in the cowl. The exit air =
area is approx. 30in2.
>=20
> Appreciate any of your thoughts from the first flight data.
>=20
> Cheers
>=20
> Steve Izett
> Glasair Super II RG Renesis 4 port RD1C EC3 EM3
>=20
>=20
>=20
> --
> Homepage:  http://www.flyrotary.com/
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