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1. 11:08 AM - Re: Re: Emailing: 033 (2) (Mark Kettering)
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| Subject: | Re: Emailing: 033 (2) |
At times the flaps added downwash on the horizontal tail pitching the nose up.
At least in many of the aircraft I have flown. In a Diamond DA40 I trim for
80 knots with half flaps and then when I add full flaps the same trim position
gives a nice 70 knots for final so has a higher alpha. But with many aircraft
you may need to pitch the nose down to keep the same speed.
Mark
-----Original Message-----
>From: Owen Baker <bakerocb@cox.net>
>Sent: Jul 29, 2014 7:17 AM
>To: Tim Yoder <ftyoder@yoderbuilt.com>, 'KIS-LIST MATRONICS' <kis-list@matronics.com>
>Subject: KIS-List: Re: Emailing: 033 (2)
>
>
>7/29/2014
>
>Hello Tim, Thanks for the detailed response. You wrote: "The pitch angle
>noticeably increases when I go to the last
>notch."
>
>Increases? Do you mean the nose goes up? That is opposite of the effect that
>I would be seeking. Let's say that right now I can just barely see the far
>end of the runway over the nose at 75 KIAS. My goal would be to decrease my
>airspeed to 70 KIAS and not have to raise the nose and lose sight of the far
>end of the runway.
>
>Would making that additional flaps down notch modification to the flap
>sectors help me or hurt me in getting towards my goal?
>
>Thanks,
>
>OC
>
>PS: I'll try to take some pictures of my flap sectors at the airport today
>and send them to you so that we can see the difference in the original shape
>of the sectors.
>
>==========================================================
>From: Tim Yoder
>Sent: Monday, July 28, 2014 8:24 PM
>To: 'Owen Baker ' ; 'KIS-LIST MATRONICS'
>Cc: 'TRICKEL MARK'
>Subject: RE: Emailing: 033 (2)
>
>Hi OC,
>
>My answers are below your comments/questions below;
>
>================================================================
>From: Owen Baker [mailto:bakerocb@cox.net]
>Sent: Monday, July 28, 2014 11:00 AM
>To: YODER TIM; KIS-LIST MATRONICS
>Cc: TRICKEL MARK
>Subject: Fw: Emailing: 033 (2)
>
>7/28/2014
>
>Hello Tim, Thanks for the pictures and the explanation. You wrote:
>
>1) "Looks like I cut the new notch back as far as I could."
>
>I have contemplated this kind of modification of my flap control sectors for
>some time, but have been too lazy to pursue it. Some comments / questions:
>
>a) Your flap sectors appear to have a different shape than mine. It would
>appear that Tri-R made some modifications to those sectors in later kits. My
>kit is number 116.
>
>***These are from kit #49, I don't know what yours look like.
>
>b) My flap sectors do not have the sharp cornered forward projections with
>the bottom scoop out that yours does. Any ideas what the purpose of that is?
>
>*** No
>
>c) Also mine do not have the slope on the aft side of the forward notch like
>yours does. Was that a local modification?
>
>*** No, that is the way It came. I only added the last (left) notch.
>I think the easy slope on the aft side of the forward notch just makes it
>easier to move the handle to the first notch.?
>
>d) I see that there is a split plastic tube guard over the bottom edge of
>the slot. What is the purpose of that?
>
>*** good observation, I forgot I did that. I was noticing that in
>flight the roll pin wasn't moving smoothly, galling, due to pushing the
>release button hard because of the flight load on the flaps. When the
>plastic tubes wore out and it started again so I took a closer look and saw
>that the roll pin slot was oriented down, you cannot see it in the photo but
>it is, so I turned the roll pin horizontally and fix that problem.
>
>2) ".... helps the pitch angle on approach."
>
>By that do you mean that you can have a lower nose attitude angle for the
>same indicated airspeed by use of that additional extension of the flaps? If
>so that might just be the additional motivation that I need to make that
>added notch modification.
>
>*** Yes, The pitch angle noticeably increases when I go to the last
>notch. On the ground I get the recommended 28 deg. After lifting the
>trailing edge of the flaps in order to remove the slop in the system.
>
>Right now I insist on keeping the far end of the runway in sight over the
>nose during the approach and flare which gives me a pretty flat nose
>attitude at touch down. Now with any speed less than 75 KIAS I would block
>out that over the nose picture. I usually have my engine set at 1,300 RPM +
>or - a bit during the approach once I am on glide slope and leave it set at
>that RPM to control descent rate until touch down.
>
>*** My procedure is much like yours with similar numbers, I almost
>always have someone with me and my field elevation is 1400' also, I sit very
>tall in the cockpit. And I doubt that I an as good a pilot as you so it is
>hard to compare.
>
>If I could still have that same over the nose picture at 70 KIAS I would
>consider making that additional flap sector notch to be a worth while
>modification.
>
>*** I only did the mod because I wanted to get the book recommended
>28 deg's. and I was glad I did it. I think it was Scott Stearns that
>recommended trying to get mire than 28 deg. I would if I had the extra room.
>I hope this helps, Tim
>
>OC
>
>
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