REFLECTOR: Reflector Digest, Vol 66, Issue 77 Lighting

Mark Riley the_rileys1 at verizon.net
Fri Nov 27 17:42:15 CST 2009


I have the Aveo lights mounted on my XL. You can see pictures at
marksvelocity.blogspot.com if you want to check them out.

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Sent: Friday, November 27, 2009 5:41 PM
To: reflector at tvbf.org
Subject: Reflector Digest, Vol 66, Issue 77

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Today's Topics:

   1. Re:  Trim authority (Al Gietzen)
   2. Re:  Pitch trim and pitch stability. (Al Gietzen)
   3. Re:  lighting (David Ullman)
   4. Re:  lighting (Matt Bucko)
   5. Re:  lighting (Douglas Holub)


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Message: 1
Date: Fri, 27 Nov 2009 10:58:54 -0800
From: "Al Gietzen" <ALVentures at cox.net>
Subject: Re: REFLECTOR: Trim authority
To: "'Velocity Aircraft Owners and Builders list'"
	<reflector at tvbf.org>
Message-ID: <8366FD1116A5409A93BB3961FAA81146 at BigAl>
Content-Type: text/plain; charset="iso-8859-1"

John;

In that case the bending force would be strongest at the point where the
spring makes a 180 turn and least at the ends.  Or am I missing something?

 

On further thought I?d say I really don?t know what the stress distribution
is.  The sides of the U are also in bending stress; and depending on how it
is connected to the torque tube bracket (wedge shim, or not), and the trim
postion; that leg is also subject to a bending moment as the TT rotates.
For me the uniform width has worked fine.

 

Why do the best landings occur when there is no one in the right seat to be
impressed by it?

The landing characteristics are almost always worse with a passenger on
board:-).

 

Al

 

 

John;

The width of the ? trim spring in mine is about 1 ?? ? uniform width to
avoid concentrating bending stress in one area.  Just guesstimating; I?d say
with full down-trim (elevator up) it takes 25+ lbs stick force to pull
elevator to about 1? down ? which is about what I?d need for landing.
Similar in the other direction to get about 1? up. 

Hope this helps.

Just went flying around a bit today ? with our current slightly easterly
flow, temps mid 70?s, smooth, crystal clear for 50 miles. Did a perfect
landing, I?d rank in the top 5 ever - makes you love your airplane. 

Al

 

Al,

Thanks.  Avoiding concentrating the bending stress is also what I have in
mind with my suggestion to vary the spring width.  It's been a while since
I've looked at it, but as I recall the spring is a "U" shape, with attach
points at both ends.  In that case the bending force would be strongest at
the point where the spring makes a 180 turn and least at the ends.  Or am I
missing something?

 

Why do the best landings occur when there is no one in the right seat to be
impressed by it?

 

John

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Message: 2
Date: Fri, 27 Nov 2009 11:11:59 -0800
From: "Al Gietzen" <ALVentures at cox.net>
Subject: Re: REFLECTOR: Pitch trim and pitch stability.
To: "'Velocity Aircraft Owners and Builders list'"
	<reflector at tvbf.org>
Message-ID: <4EE4C76EA3714CC2A8A958BF23BC3CD1 at BigAl>
Content-Type: text/plain; charset="us-ascii"

 

How are you able to tell when your main wing will stall?

 Doug Holub

Some time back; maybe a year or more, Scott Baker described a procedure for
testing approach to deep stall condition.  Maybe you can find it in the
archives.  Basically, as I recall it; test fly with progressively further
aft CG until you sense that the nose becomes light, or wants to go up as you
approach stall.  But best you read his words.  And probably not something to
try unless you are very experienced about how your plane reacts and 'feels'.
And best to have plenty of altitude and maybe some significant weight that
you can shift forward when needed.

 

Al

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Message: 3
Date: Fri, 27 Nov 2009 10:49:47 -0800
From: "David Ullman" <ullman at robustdecisions.com>
Subject: Re: REFLECTOR: lighting
To: <reflector at tvbf.org>
Message-ID: <00dd01ca6f92$65561890$300249b0$@com>
Content-Type: text/plain;	charset="us-ascii"

I am rethinking the lighting on my Velo.  I am leaning toward Aveo LED
system.  The tip lights have red/green, white and a strobe.  But these wont
be able to be seen from the rear per FAR 23.1397.  The Aveo dealer suggested
a Posistrobe on top of the fuselage.  It has a white position light plus a
strobe.  This fulfills the FAR as it can be seen from the rear, but I am not
convinced it completes the picture for FAR 23.1401 for horizontal lighting
and there may be an area below the plane not covered by any of these lights.
A second Posistrobe on the bottom would fix this, but it costs $306.  Do I
need the bottom strobe?   Other suggestions?

David G. Ullman 
Robust Decisions
ullman at robustdecisions.com
541-754-3609 
 

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database 4640 (20091126) __________

The message was checked by ESET Smart Security.

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Message: 4
Date: Fri, 27 Nov 2009 14:52:40 -0700
From: Matt Bucko <mbuc310 at cox.net>
Subject: Re: REFLECTOR: lighting
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Message-ID: <4B104A28.6010006 at cox.net>
Content-Type: text/plain; charset="us-ascii"

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Message: 5
Date: Fri, 27 Nov 2009 16:40:57 -0600
From: "Douglas Holub" <douglas.holub at gmail.com>
Subject: Re: REFLECTOR: lighting
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Message-ID: <D22545E1E7F947BCB6B00EEC6DFAA03F at Workshop>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"

I have Kuntzleman's combination position and strobe lights (DDM-SLC, 
http://www.kestrobes.com/cat2.htm). I like them, but the streamlined covers 
don't seal out water very well. I need to put a bigger O-ring in there.

I guess I just assumed that a person could see the white lights from 75 feet

behind the airplane-- I've never checked it. I'll check it this weekend, but

I think I will be able to see them. I've seen some planes that don't have a 
pad built out for the position lights. In that case, it might be harder to 
see the white light from behind the airplane. I've attached a picture.

Doug Holub
Standard FG w/ electric nose lift

----- Original Message ----- 
From: "David Ullman" <ullman at robustdecisions.com>
To: <reflector at tvbf.org>
Sent: Friday, November 27, 2009 12:49 PM
Subject: Re: REFLECTOR: lighting


>I am rethinking the lighting on my Velo.  I am leaning toward Aveo LED
> system.  The tip lights have red/green, white and a strobe.  But these 
> wont
> be able to be seen from the rear per FAR 23.1397.  The Aveo dealer 
> suggested
> a Posistrobe on top of the fuselage.  It has a white position light plus a
> strobe.  This fulfills the FAR as it can be seen from the rear, but I am 
> not
> convinced it completes the picture for FAR 23.1401 for horizontal lighting
> and there may be an area below the plane not covered by any of these 
> lights.
> A second Posistrobe on the bottom would fix this, but it costs $306.  Do I
> need the bottom strobe?   Other suggestions?
>
> David G. Ullman
> Robust Decisions
> ullman at robustdecisions.com
> 541-754-3609
>
>
> __________ Information from ESET Smart Security, version of virus 
> signature
> database 4640 (20091126) __________
>
> The message was checked by ESET Smart Security.
>
> http://www.eset.com
>
>
> _______________________________________________
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