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Chris,
Try taking some used engine oil, and put a several lines across the cowl
and then go high speed taxi, take a look and you can see how the air is flowing
around your inlets and exits. Friend of mine had similar issues and found that
air was flowing backwards into exit.
In one configuration he had the NACA scoops on top of the cowl, and found
that vortex generators in front of the NACA’S helped .
Strongly advocate using a water manometer to measure pressure above and
below the engine to document what each change does for you. Otherwise you are
shooting in the dark.
Bill
Schertz
KIS Cruiser #4045
N343BS
Phase one testing Completed
Sent: Sunday, May 06, 2012 7:44 AM
Subject: [FlyRotary] Re: Twin Velocity
Chris,
Do you still have the armpits as well as the NACA's? You
may need more exit space/area in order to get adequate cooling at low speed. In
other words, cowl flaps. Just a thought. Dave Staten On 5/5/2012
10:03 AM, Chris Barber wrote:
I want to but I am having some serious cooling issues on high speed taxi,
up to over 250 degrees for a few minutes (yikes). I tried something with
modified NACA's based on Velocity Inc reducing cooling issues when they
changed from armpit scoops to top NACA's, however, that is not working so I am
going to a more direct ram air with a P-51 scoop. I hope to start the
conversion later today. The process may have intimidated me years ago,
but, hey, the Gov'ment says I be a "Repairman" ;-)
Chris
Are you ready to take
advantage of that transition training? When is the first flight?
:>)
Bill
B
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net]
On Behalf Of Chris
Barber
Sent: Saturday, May
05, 2012 10:06 AM
To: Rotary
motors in aircraft
Subject:
[FlyRotary] Re: Twin Velocity
It's a kewl plane. I got to see it when I was at the
factory last month for transition training.
Chris
Sent from my iPhone
4
This thing is just begging for
two 13B or Renesis Rotary engines
!!..........................<:)
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