REFLECTOR: Parking brake

Scott Derrick scott at tnstaafl.net
Sun Jan 25 18:28:39 CST 2009


I use a similar setup.

Laurence Coen wrote:
> 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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