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That's why it's called "Experimental", the key word,
"mental". We plan on cutting it (the 4" exhaust)
into an oval, ala' turbine exhausts, and
see what happens. We have cooling and oil lines coming into the lower
cowl, and honestly don't want the heat there if we can help
it.
Greg
----- Original Message -----
Sent: Thursday, March 12, 2009 8:47
AM
Subject: [FlyRotary] Re: Fw: [FlyRotary]
progress on N178RG
Greg,
The "exhaust exit out the side" should look really cool, but will
certainly add drag to your airframe. I didn't do this because my door is
on the left and I didn't want to risk asphyxiating myself and my pax. My
DNA muffler exits out the left tunnel and just about fills
the tunnel. I'm considering adding some louvers on the left side
cowl for the oil cooler exit air. I think it would really help with the
oil temps, maybe enough to allow removal of the oil-to-water exchanger.
It would also provide additional flow for the water radiator. But, as I
stated above, it will add to my cooling drag. Then again, maybe I should
just leave things alone.
Mark
On Mon, Mar 9, 2009 at 10:36 AM, Greg Ward <gregw@onestopdesign.biz>
wrote:
Hey Mark;
Yeah, it's a Legacy, and to flip it over, we have
to wheel it outside, and crank the rotisserie as high as it will go, lotta'
fun. As to the turbo and exhaust, they occupy the whole lower left
area of the cowl, and exit directly out the side, and as I said below,
we are leaving the stock exhaust bubbles in the lower cowl intact for heat
to exit. Tests will tell how effective this is.
Greg Ward
----- Original Message -----
Sent: Monday, March 09, 2009 5:18
AM
Subject: [FlyRotary] Re: Fw:
[FlyRotary] progress on N178RG
Greg,
That is a cool looking scoop. I'm looking forward to
seeing the side profile. This is a Lancair Legacy, correct?
(BTW, how do you flip it over inside the garage?)
One comment... don't underestimate the heat generated by the 20B
exhaust. I think one of the big benefits of having the radiator
inside the cowl is that the airflow helps to cool the
white-hot exhaust. Without that airflow, you risk melting
anything within sight of the exhaust.
Mark S.
On Sun, Mar 8, 2009 at 9:10 PM, Greg Ward <gregw@onestopdesign.biz> wrote:
----- Original Message -----
Sent: Sunday, March 08, 2009 7:06 PM
Subject: Re: [FlyRotary] progress on N178RG
A few shots of our cooling system finally
mounted as far as the firewall. The two 1-1/2"
cooling lines will be covered with 3" 1/2 round plastic covers, 2"
smaller in diameter than the exhaust outlets on the cowling, which will
continue to let heat from the engine exit. You can't see the oil
cooler, as it is mounted inside the scoop, in a similiar fashion as the
P-51.
We are awaiting final engine dyno tests, and
then we can mate the whole mess up, and start on the next
phase.
Greg Ward;
Lancair 20B N178RG in
progress
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