On the pusher/rear eng. aircraft the air leaking " OUT " from around the spinner/cowl area sounds like it would not be an issue, one more area for cowl pressure to escape then just follow the spinner back away. David
From: "Ernest Christley" <echristley@att.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, August 31, 2012 1:15:37 PM
Subject: [FlyRotary] Re: FIRST FLIGHT N655HC
The area between the cowl and spinner on my plane is used for intake air. I seal the cowl to PSRU mount plate with 2" wide silicone baffling that is slitted every 1" to be more flexible. Each slit ends in a 1/8th inch hole I punched to stop it from tearing all the way through. It is riveted to the cowl.
Bill Bradburry <bbradburry@bellsouth.net> wrote:
>I didn't see any input when I last asked this question, so I will try now
>that we are again talking about cooling.
>
>
>
>How are you sealing around the PSRU outlet on the cowl? I am talking about
>the area behind the spinner. This area allows air to enter behind the heat
>exchangers and it seems to me that it would adversely affect cooling. This
>area is open on my plane because I haven't figured out how to seal it. I am
>wondering what others have done?
>
>
>
>Bill B
>
>
>
> _____
>
>From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
>Behalf Of Ed Anderson
>Sent: Friday, August 31, 2012 11:56 AM
>To: Rotary motors in aircraft
>Subject: [FlyRotary] Re: FIRST FLIGHT N655HC
>
>
>
>Congratulations David,
>
>
>
>I would completely seal any leaks around the sides or anyplace else that
>could leak between duct inlet and radiator. I read someplace that a
>1/2"square hole could cost you 20% of your cooling effectiveness.
>
>
>
>A gent who once sold Subaru engine installations tried just sticking the
>radiator in back of the opening (no ducting) - did not cool.
>
>
>
>Yes, I find that getting the airflow up as soon as safely possible will help
>a great deal in keeping temps down and bring them back down quickly. My
>magic airspeed after take off is 120 MPH IAS then a 140 IAS for climbout.
>
>
>
>Looking forward to more reports
>
>
>
>Ed
>
>
>
>
>
>
>
>From: Ernest Chrisltey <mailto:echristley@att.net>
>
>Sent: Friday, August 31, 2012 11:01 AM
>
>To: Rotary <mailto:flyrotary@lancaironline.net> motors in aircraft
>
>Subject: [FlyRotary] Re: FIRST FLIGHT N655HC
>
>
>
>Congratulations, David. I hope to be following you soon.
>
>Are you able to cool on the ground? What did you do to improve the cooling
>between the two flights?
>
>
>On 08/30/2012 10:48 PM, hoursaway1@comcast.net wrote:
>
>Thanks Mark, it was kind of anti-climatic for the others on the ground
>because they already saw that last month, but for me seeing the temps coming
>down at about the same stage as Terry saw them still climbing was
>comforting. I'm setting up a video camera to record the panel so I can
>focus on flying for now until I get more comfortable. We have a 100 mile
>radius to work with & I asked for & was granted a crew member during the
>flights that computer tuning will be worked on. Tryed to get a stewardess
>also but FAA said no. ???? Yes I read Ed's procedure for takeoff & our
>sys. is very similar so will use for next flights. Terry is a member of our
>EAA Chapter 55 here in Mason MI, his dad just flew his 400 th Young Eagle.
>( where is that stewardess with my Margarita ) David.
>
>
> _____
>
>
>From: "Mark Steitle" <mailto:msteitle@gmail.com> <msteitle@gmail.com>
>To: "Rotary motors in aircraft" <mailto:flyrotary@lancaironline.net>
><flyrotary@lancaironline.net>
>Sent: Thursday, August 30, 2012 7:44:53 PM
>Subject: [FlyRotary] Re: FIRST FLIGHT N655HC
>
>David,
>
>
>
>Congrats!!! Job well done. Terry Lutz... WOW!
>
>
>
>What was the OAT? I start to get nervous when my coolant temp goes above
>200 F. No reason to climb at WOT if not needed and OAT is high.
>
>
>
>Mark S.
>
>On Thu, Aug 30, 2012 at 6:07 PM, <hoursaway1@comcast.net> wrote:
>
>First flight for me anyhow not for the aircraft, Terry Lutz ( AKA;; world
>renowned professional test pilot, flew in from France to do the First, First
>flight )
>Temps went;; coolant 221 F max, oil 210 F max, on full throttle clime
>out up to 2000 ft., powered back from 6300 rpm to 5000 rpm/135 mph
>indicated, push the nose over to level off, pulled power back to 4500 rpm (
>made no prop pitch changes at this time ) temps went down to;; coolant
>195 F, oil 190 F, this is without therm. & bypass blocked, also would like
>comments about sealing around sides of both radiators, we saw the extra fins
>there so we allowed air to pass through that area, may install a temp seal &
>recheck data points next flight. Then possibly install venting openings in
>bottom of cowl to let more airflow out quicker. David R. Cook RV6A
>Rotary.
>
>
> _____
>
>
>From: "Joseph Pirch" <pirch@sbcglobal.net>
>To: hoursaway1@comcast.net, "rv man2010" <rv.man2010@hotmail.com>
>Sent: Wednesday, August 29, 2012 8:40:58 PM
>
>
>
>
>
>[image/jpeg:photo.JPG]
>
>
>
>
>Sent from my iPad
>
>
>
>
>
>
>
>No virus found in this message.
>Checked by AVG - www.avg.com
>Version: 2012.0.2197 / Virus Database: 2437/5237 - Release Date: 08/31/12
>
--
Homepage: http://www.flyrotary.com/
Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html