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dashvii(at)hotmail.com
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 Posted: Thu Apr 03, 2008 8:30 am Post subject: Tail Redesigns |
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| Quote: | | Quote: | | Just a few observations and things to think about. I am attaching some pics to describe a little better what I'm talking about.During the course of on-going testing, it was decided to change the elevator slightly. A couple of the changes were a decrease inweight. I think it was a 3lbs decrease, by taking out the counterweighted and balanced part. It was discovered that there wasno flutter or adverse handling issues with the tail that would require this. The other change that I noticed was that the new horizontalsare all shielding the ends of the rudder. Nick commented that this acts like a spade and even though wasn't a huge deal, it would makethe handling even better and more predictable. I believe 3 aircraft including: the prototype, Greg Hobbs and Earl Ferguson's airplane allinitially had these. I do not believe either customer plane flew like this. The prototype completely switched out to a set of "production tailfeathers" My first picture below shows the original tail on the prototype. I have outlined it a little better so that you can see it. The second picture shows what all subsequent production Lightnings rolled off the line with. You can see the front edge is now part of the horizontal stabilizer instead of the elevator and shields the elevator end piece. The final picture shows the vertical stabilizer.During the course of on-going testing, it was decided to change the elevator slightly. A couple of the changes were a decrease in |
0 | Quote: | | During the course of on-going testing, it was decided to change the elevator slightly. A couple of the changes were a decrease in |
1 | Quote: | | During the course of on-going testing, it was decided to change the elevator slightly. A couple of the changes were a decrease in |
2 | Quote: | | During the course of on-going testing, it was decided to change the elevator slightly. A couple of the changes were a decrease in |
3 | Quote: | | During the course of on-going testing, it was decided to change the elevator slightly. A couple of the changes were a decrease in |
4 | Quote: | | During the course of on-going testing, it was decided to change the elevator slightly. A couple of the changes were a decrease in |
5 | Quote: | | During the course of on-going testing, it was decided to change the elevator slightly. A couple of the changes were a decrease in |
6 | Quote: | | During the course of on-going testing, it was decided to change the elevator slightly. A couple of the changes were a decrease in |
7 |
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jhausch
Joined: 14 Jan 2008
Posts: 35
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dashvii(at)hotmail.com
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| Posted: Fri Apr 04, 2008 6:14 am Post subject: Tail Redesigns |
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The spades on aircraft (found on things like Citabrias) help to eleviate control pressures and also work as a dynamic balance. They hang down from the ailerons and look like a spade or shovel. From what I understand, by shielding this, it helps to greatly reduce that effect. From what I have read though, when applied to the rudder, a shielded rudder will help to reduce the nose initially swinging opposite of the rudder input, especially during control reversal. I think that it is also done for looks though. Just noticed that most aircraft, including the similar looking Lancair have this. When I flew the Lightnings I don't remember Dutch Roll as being a problem, just wondered if the Arion guys had thought to try this out and see if it makes any difference, and what their thoughts on this might be. Brian W.
[quote] Subject: Re: Tail Redesigns
From: jhausch(at)charter.net
Date: Fri, 4 Apr 2008 04:06:45 -0700
To: lightning-list(at)matronics.com
--> Lightning-List message posted by: "jhausch" <jhausch(at)charter.net>
Thanks for the explanation and pictures.
I don't know enough about aerodynamics or ac design to comment, but that's never stopped me before [Wink]
Please explain the idea behind the benefit offered here (you called it the spade effect?) vs if you were to just extend the fixed and moving parts of the H-stab/elevator full length?
I have attached a crude sketch to explain.
What is the A/C in the background of Horizontal 1?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=174762#174762
Attachments:
http://forums.matronics.com//files/tail_feathers_180.jpg
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dashvii(at)hotmail.com
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| Posted: Fri Apr 04, 2008 8:55 am Post subject: Tail Redesigns |
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Oh, and the aircraft in the background is a Jabiru J-250 I believe. Basically a 4 seater high wing with the rear two seats removed, can be a special light sport, but gives a huge baggage compartment with full sized door for access. Brian W.
| Quote: | From: dashvii(at)hotmail.com
To: lightning-list(at)matronics.com
Subject: RE: Re: Tail Redesigns
Date: Fri, 4 Apr 2008 09:08:02 -0500
.ExternalClass .EC_hmmessage P {padding:0px;} .ExternalClass body.EC_hmmessage {font-size:10pt;font-family:Tahoma;} The spades on aircraft (found on things like Citabrias) help to eleviate control pressures and also work as a dynamic balance. They hang down from the ailerons and look like a spade or shovel. From what I understand, by shielding this, it helps to greatly reduce that effect. From what I have read though, when applied to the rudder, a shielded rudder will help to reduce the nose initially swinging opposite of the rudder input, especially during control reversal. I think that it is also done for looks though. Just noticed that most aircraft, including the similar looking Lancair have this. When I flew the Lightnings I don't remember Dutch Roll as being a problem, just wondered if the Arion guys had thought to try this out and see if it makes any difference, and what their thoughts on this might be. Brian W.
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