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You know Bill I never even thought of that area as a air bypass but it does look like a leak, the Lyc. guys kind of ignore it , but then again the air would pass right down the crank case for them, outside there baffling. David.
From: "Bill Bradburry" <bbradburry@bellsouth.net> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net> Sent: Friday, August 31, 2012 12:25:29 PM Subject: [FlyRotary] Re: FIRST FLIGHT N655HC
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
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
Sent: Friday, August 31, 2012 11:01 AM
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" <msteitle@gmail.com>
To: "Rotary motors in aircraft" <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
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