REFLECTOR: Parking brake

[Laurence Coen]

Scott,

I don't have a parking brake on my Velocity but I do use chocks and tie it 
down if it's on the ramp over night.  I made my chocks from 1.5" aluminum 
angle about 3" long.  I have 3 pair and use them when ever I'm not in the 
hanger.  If I'm away from home I also carry my own tie downs.  I've been to 
airports that have rotten ropes that wouldn't keep a small dog from running 
off.  My tie downs are cargo straps that have a hook on each end and a 
buckle that allows snuggling them up with a pull on the free end.

Larry Coen
N136LC


--------------------------------------------------
From: "Scott Derrick" <scott at tnstaafl.net>
Sent: Sunday, January 25, 2009 8:28 AM
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Subject: Re: REFLECTOR: Parking brake

> I've been flying for 3,000 + hours and never used a parking brake.
>
> granted I've never flown a tail wheel aircraft which I've been told
> really needs one because it will roll into the wind at the slightest 
> breeze.
>
> Scott
>
> Chuck Jensen wrote:
>> David,
>>
>> A parking brake does not come standard, by it's highly recommended. 
>> Matco (Aircraft Spruce) make an inexpensive dependable brake that can be 
>> actuated with a little push-pull cable.  You plumb your lines into it and 
>> when it is set on 'brake', actuating the brakes will pressurize the line 
>> from the Matco valve to the brakes and hold pressure.  Or, you can 
>> actuate the brakes and then shut the Matco valve.
>>
>> At one time parking brakes were discouraged; it was thought if the brakes 
>> were pressured and locked, and later in the day it warmed up, that it 
>> might over-pressurize the brakes.  Great theory but it's not a problem in 
>> practice.  I can set my brake and come back a week later and they are 
>> still locked.
>>
>> Hint.  Set up your cable so that pushing the knob in releases the brake 
>> and pulling it engages the check valve.  If you reverse it and you happen 
>> to bump the knob in while in flight, then when you actuate the brakes on 
>> landing they will stay locked up....not good.
>>
>> Chuck Jensen
>>
>>
>>
>> -----Original Message-----
>> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On
>> Behalf Of David Ullman
>> Sent: Saturday, January 24, 2009 11:58 AM
>> To: reflector at tvbf.org
>> Subject: Re: REFLECTOR: Parking brake
>>
>>
>> I was flying my friends Grumman Tiger the other day and inquired how the
>> parking brake works.  Since the Grumman has a castoring noise wheel and 
>> is
>> steered with hydraulic toe brakes, this seemed a good question as I am 
>> now
>> plumbing the brakes on my Velocity.  It appears that when you pull the
>> parking brake knob, you are locking the hydraulic pressure on the brakes.
>> So, to apply the parking brakes, you apply both toe brakes, and then pull
>> the knob, hydraulically locking them.
>>
>> I don't recall seeing this capability in my Velocity kit nor hearing it
>> discussed on this site.  Anyone done this?  If so where did you get the
>> knob/valve assembly, to do this?
>>
>> David G. Ullman PhD ME
>> Robust Decisions
>> ullman at robustdecisions.com
>> 541-754-3609
>>
>>
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