REFLECTOR: Video of NOSE GEAR DOOR DO-HICKEY

[Tom & Mo Falls]

Scott B (and others),

First and unequivocally, I am fully on board with the concept that all
designs must be proven/de-bugged with thorough field testing. I'm curious
about a few things though.

1. Why does the retracted nose wheel bounce in turbulence? The hydraulic
fluid in the lines is incompressible and should hold everything firm. Could
this be traced to air in the lines or a leak in the system? Is there enough
G force to compress the shock?

2. If bouncing nose gear can not be eliminated, wouldn't the sequencing
valve in the current design be triggered as much as the mechanical link
systems, in terms of slamming the doors open & closed in turbulence?

My thinking is not intended to challenge current wisdom. I'm interested in
more background so I can determine if design modifications to the mechanical
linkage is needed/possible, or if I should be thinking about going back to
the original set up. I've got time to hear feedback from others and wait
test results. It is a lot easier to access however, with the top half of the
fuselage stored in a corner.

Tom Falls
Should have something looking like an SERG in 2008.


-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Scott Baker
Sent: Thursday, June 02, 2005 5:07 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Video of NOSE GEAR DOOR DO-HICKEY

The system was the brainchild of Brian Gallagher (see www.airmech.com).  We 
have observed the installation of this setup with keen interest on Dan 
Smalley's aircraft (Dan is building his XL-RG in Sebastian).  I like the 
idea of eliminating hoses, cylinders, sequence valves.  We have not had the 
opportunity to evaluate this setup in actual practice.  Our only wonder 
about this mechanical linkage deals with how the system will work in 
turbulence.  The retracted nose gear assembly has a lot of weight and arm. 
The hydraulic doors, though they are not designed from the beginning to do 
this, help keep the gear tucked inside of the nose compartment when things 
start bouncing around.  We are curious to learn, during bumpy ride 
situations, if the nose gear will move up and down an inch - and if so, what

will be the affect of the nose gear doors opening and closing (slamming) in 
concert with the movement.  Again, we like the idea - and Brian has 
graciously invited Velocity to use the design if we wish.
Best regards,
SB

----- Original Message ----- 
From: "Greg Poole" <gpoole at zeta.org.au>
To: <dvblack at comcast.net>; "Velocity Aircraft Owners and Builders list" 
<reflector at tvbf.org>
Sent: Wednesday, June 01, 2005 6:38 PM
Subject: Re: REFLECTOR: Video of NOSE GEAR DOOR DO-HICKEY


> Thanks for your thoughts on this Dave!  ...am left wondering what the 
> factory "take" would be on this as it certainly embodies the KISS (...keep

> it simple...) principle and in doing so would appear to reduce parts 
> count, kit cost, wieght, potential failure points, build time, and areas 
> requiring adjustment. There...did  I cover em all?
>
> What does the factory say Scott Baker?
>
> Greg in Sydney.
>
>
> ----- Original Message ----- 
> From: "Dave Black" <dvblack at comcast.net>
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Sent: Wednesday, June 01, 2005 9:03 PM
> Subject: Re: REFLECTOR: Video of NOSE GEAR DOOR DO-HICKEY
>
>
>> Scott,
>>
>>> Here's Tom & Mo Falls video of the Nose Gear Mechanism.
>>>
>>> http://www.tnstaafl.net/canards/ng_mech.avi
>>
>> Now, THAT's the way to do it!!
>> No sequence valve, no hydraulic cylinder, and no slamming doors!
>>
>>
>> Dave Black
>> Shortwing RG
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