REFLECTOR:Gear Speed
John Dibble
reflector@tvbf.org
Fri, 26 Dec 2003 14:27:41 -0600
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Scott Baker wrote:
> The air stream doesn't offer a lot of force against the split nose
> gear doors.
How do you know this? Have you ever measured how much force there is?
> The weight of the nose gear leg, casting, wheel, and tire offer a
> goodly amount of weight.
So prove to me that the air stream force on the doors is less than goodly.
> If the gear doesn't freely free fall through the doors at 120 knots,
> then something else (not the doors) is holding things up.
> The nose gear's free fall operation needn't be the subject of theory
> or to "Gee, I wonder if the slip stream is going to keep the gear
> doors from opening" speculation.
It wouldn't be subject to theory if you can explain to me why my nose
gear drops and locks perfectly on the ground and not in the air.
> Go fly the aircraft, test the emergency gear extension process and
> confirm that everything is working as it should.
I did fly it - with a dead battery (not intentionally of course) - and
it didn't work as it should. Now I'm trying to find out why.
John
> The gear should fall with deliberate movement and travel to the
> "down and locked" position with authority. If it doesn't, find out
> what's stopping the system from doing so, and fix it.
> The slip stream will move the gear to the point that it _almost_
> reaches the overcenter position. A mirror will not tell you if the
> nose gear is in the overcenter/locked position. If the gas spring is
> weak, it may not have enough force to push the linkage to the
> overcenter/locked position. Also, if the gas spring is weak, it may
> get the gear to the overcenter position - but it may not have enough
> force to keep it in the overcenter position following touchdown. Many
> Velocity builders have installed a little hole in the side of the keel
> to stick a pry-bar into the keel to help move the nose gear linkage
> that last little bit into the overcenter position (this is a failsafe
> to a failsafe). Pulling some "G-forces" will help move the nose gear
> to the overcenter position. It may not always do the job.
Scott B.
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Scott Baker wrote:<br>
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<div><font face="Arial" size="2">The air stream doesn't offer a lot
of force against the split nose gear doors.</font></div>
</blockquote>
How do you know this? Have you ever measured how much force there is?<br>
<blockquote type="cite" cite="mid000f01c3cb6e$90e20b00$0200a8c0@DAD">
<div><font face="Arial" size="2"> The weight of the nose gear leg,
casting, wheel, and tire offer a goodly amount of weight.</font></div>
</blockquote>
So prove to me that the air stream force on the doors is less than
goodly.<br>
<blockquote type="cite" cite="mid000f01c3cb6e$90e20b00$0200a8c0@DAD">
<div><font face="Arial" size="2"> If the gear doesn't freely free
fall through the doors at 120 knots, then something else (not the
doors) is holding things up.</font></div>
<div><font face="Arial" size="2">The nose gear's free fall operation
needn't be the subject of theory or to "Gee, I wonder if the slip
stream is going to keep the gear doors from opening" speculation.</font></div>
</blockquote>
It wouldn't be subject to theory if you can explain to me why my nose
gear drops and locks perfectly on the ground and not in the air.<br>
<blockquote type="cite" cite="mid000f01c3cb6e$90e20b00$0200a8c0@DAD">
<div><font face="Arial" size="2"> Go fly the aircraft, test the
emergency gear extension process and confirm that everything is working
as it should.</font></div>
</blockquote>
I did fly it - with a dead battery (not intentionally of course) - and
it didn't work as it should. Now I'm trying to find out why.<br>
<br>
John<br>
<blockquote type="cite" cite="mid000f01c3cb6e$90e20b00$0200a8c0@DAD">
<div><font face="Arial" size="2"> The gear should fall with
deliberate movement and travel to the "down and locked" position with
authority. If it doesn't, find out what's stopping the system from
doing so, and fix it.</font></div>
<div><font face="Arial" size="2">The slip stream will move the gear
to the point that it _almost_ reaches the overcenter position. A
mirror will not tell you if the nose gear is in the overcenter/locked
position. If the gas spring is weak, it may not have enough force to
push the linkage to the overcenter/locked position. Also, if the gas
spring is weak, it may get the gear to the overcenter position - but it
may not have enough force to keep it in the overcenter position
following touchdown. Many Velocity builders have installed a little
hole in the side of the keel to stick a pry-bar into the keel to help
move the nose gear linkage that last little bit into the overcenter
position (this is a failsafe to a failsafe). Pulling some "G-forces"
will help move the nose gear to the overcenter position. It may not
always do the job.</font></div>
</blockquote>
<div><font face="Arial" size="2">Scott B.</font></div>
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