REFLECTOR: 165 kt Gear Extension Speed
Tom Martino
tmartino at troubleshooter.com
Tue Dec 6 09:46:40 CST 2005
I am going to post photos in a day or so. I am going to the hangar
tonight.
-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Scott Derrick
Sent: Monday, December 05, 2005 8:38 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: 165 kt Gear Extension Speed [heur]
Tom,
I'm very interested in your new nose gear mechanism. I remember your
first post about it and it sounded simple and effective.
Scott
Tom Martino wrote:
>I can tell you first hand ... that my gear doors made no appreciable
>difference in indicated airspeed.
>
>I can indicate 200 knots with or without them. I could not notice any
>difference at all.
>
>I did away with them. Keeping it simple!
>
>I also came up with a unique way to close the nose gear doors. I will
>soon post photos. I wanted to wait until I had 50 hours on it ...
which
>has come and gone.
>
>The nose door system consists of a cable (similar to the rudder cable)
>with a spring on each end. The cable is looped through an eyelet on
the
>nose strut and then each spring end is connected to the gear door.
>
>When the strut is lifted to bring up the gear, the cable pulls on the
>doors and the springs keep them tightly closed. (The cable runs freely
>which automatically equals out the pressure on each door.)
>
>When the strut drops, it pulls down on the gear doors to open them.
>
>I am not sure what gear extension speed is safe to use with no main
gear
>doors, but there isn't much to falter. Can anyone venture a guess as
to
>how much speed the main gear struts can take?
>
>Tom
>
>-----Original Message-----
>From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
>Behalf Of Scott Derrick
>Sent: Sunday, December 04, 2005 7:43 PM
>To: Velocity Aircraft Owners and Builders list
>Subject: REFLECTOR: 165 kt Gear Extension Speed [bayes][heur]
>
>I have been flying a T210 lately and can't say enough about how
>versatile the 165 Kt gear extension speed is. Once extended you can
run
>
>up to Vne. This 210 does not have any main gear doors, just nose gear
>doors.
>
>Yesterday I was flying in from Las Cruces, was day dreaming and
suddenly
>
>realized I was 15 miles from the airport at 10,500 and needed to be
down
>
>to 7,500 in 10-12 miles, and slowed down to 120 kts when reaching
>7,500. Totally impossible in my V. I let the gear down, and
without
>
>touching anything else was descending at 800ft a minute at 150 kts
>indicated. I pulled 2 inches of MAP every 2 minutes, and made a
>straight in with no problems, no stress... All because I could extend
>the gear at such a high speed.
>
>My V should cruise much faster once I'm back in the air and I'm
>concerned about being able to slow down or descend rapidly if required,
>and not abuse the engine by having to pull the throttle from 75% to
>idle. The only option in a Velocity cruising above 120 kts.. Well you
>can extend both rudders but thats not nearly enough.
>
>I have considered modifying the speed brake, but not sure what would be
>needed to insure it wouldn't depart the airframe at 165 kts if
extended,
>
>much less 200 Kts..
>
>So I'm now considering emulating the T210.
>
>First by removing most of the main doors:
> Leave the portion that covers the brake unit attached but beef it
>up.
> Leave the short portion that seals off the fuselage when the gear
>is up, and beef that piece up too.
> Glass the brake line onto the gear leg, or add a fiberglass
channel
>
>for it to sit in(not carve out but add a 'U' channel).
>
>Then beef up the nose gear doors and hinge points.
> A couple carbon fiber layers on the inside of the doors
> Reinforce the hinges and fuselage pivot points with carbon fiber
>
>I wonder if the nose gear extension mechanism(rods, sliders, hyd ram,
>etc) would be up to a 165 kt extension? Somebody had mentioned they
>were testing a simplified nose gear door mechanism that used the nose
>strut to extend the doors, is this working?
>
>I remember reading a post from Scott Baker that the gear extended
speed,
>
>sans doors, was Vne, like the T210. Is this correct?
>
>I also remember reading that a couple of folks have tested their planes
>with and without main doors with no noticable speed loss. Correct?
>
>Sound sensible? I really think with the high cruise speeds of the
>Velocity, being able to extend the gear at around 165 kts, would really
>enhance its capability and safety.
>
>Scott
>
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>
>
>
>
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