REFLECTOR: brake lines

Scott Derrick scott at tnstaafl.net
Wed Mar 8 09:02:35 CST 2006 

Ron,

did you glass in the larger tube and then feed the brake line through that?

The reason I'm inquiring is, I am planning on removing most of my main 
gear door as part of a modification to increase my gear extension speed 
to 160 knots.  Right now I have flexible braided line running from 
inside the fuselage down the leg to the caliper,  attached at a few 
spots to the gear door.  With most of the gear door removed I had 
thought I could glass in the brake tube like its done on EZ's.  Glassing 
in a larger tube seems like a great idea, so I can easily replace the 
smaller tube that carries the fluid.

Scott

Ron Brown wrote:
> No, I used larger diameter nylon tube that the nyloflow would fit in.  
> I stopped that about 8" above the caliper.  Then I installed an 8" 
> length of 3/16(? - it is the same size as the nyloflow) aluminum 
> tubing.  I used the same brass fittings supplied for the nyloflow.  
> NAPA had the additional union fittings and ferrules that I needed.
>
> Ronnie
>
> ----- Original Message ----- From: "Scott Derrick" <scott at tnstaafl.net>
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Sent: Tuesday, March 07, 2006 11:10 PM
> Subject: Re: REFLECTOR: brake lines
>
>
>> Ron,
>>
>> did you glass your lines into the legs?
>>
>> Scott
>>
>> Ron Brown wrote:
>>> No, not a safety issue to run the nyloflow in the duct with the oil 
>>> lines. I ran mine down the keel because on my RG that is where the 
>>> lines needed to end up at the back where they connect to the 
>>> pivoting main gear legs.  The picture you're referring to is 
>>> actually an RG too.  The lines run through a piece of larger nylon 
>>> tubing from the left side duct to the center of the gear bulkhead.
>>>
>>> However, I did run about 8" of aluminum line at the bottom of the 
>>> gear legs to minimize the chance of overheating the nyloflow from 
>>> the heat of the calipers.  This IS a safety issue.  I personally 
>>> know of two planes (not Velocities) that lost brakes on initial taxi 
>>> testing due to nyloflow overheating and blowing out. RV's have had 
>>> the same problem.
>>>
>>> Ronnie
>>>
>>>
>>> ----- Original Message ----- From: "Grigore Rosu" <grosu at cs.uiuc.edu>
>>> To: "'Velocity Aircraft Owners and Builders list'" <reflector at tvbf.org>
>>> Sent: Tuesday, March 07, 2006 6:51 PM
>>> Subject: RE: REFLECTOR: brake lines
>>>
>>>
>>>> Kevin,
>>>>
>>>> Yes, I am sure.  I initially had a similar concern, so I sent a 
>>>> message to
>>>> the factory.  Scott Swing answered and said that both the brake 
>>>> lines and
>>>> the rudder cable use the same nylaflow; the kit came with 55 feet of
>>>> nylaflow, I guess enough for both the rudder and the brake lines.
>>>>
>>>> Ron and others, is there a real safety issue with running the 
>>>> nylaflow brake
>>>> lines with hot oil through the airducts?  I'm a beginner in 
>>>> building and I'd
>>>> prefer to just follow the manual confidently, without having to 
>>>> worry about
>>>> things being unsafe ...
>>>>
>>>> Yes Michalk (sorry, I do not know your first name), I'm slowly 
>>>> learning how
>>>> to read between the lines.  But still, I'd prefer not to deviate 
>>>> from the
>>>> manual, because I want to fly it soon.
>>>>
>>>> Thanks,
>>>> Grigore
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: reflector-bounces at tvbf.org 
>>>> [mailto:reflector-bounces at tvbf.org] On
>>>> Behalf Of Velocity_AZ
>>>> Sent: Tuesday, March 07, 2006 4:37 PM
>>>> To: 'Velocity Aircraft Owners and Builders list'
>>>> Subject: RE: REFLECTOR: brake lines
>>>>
>>>> Are you sure you are not seeing the nylaflow tubing that houses the 
>>>> rudder
>>>> cable?
>>>>
>>>> Kevin
>>>>
>>>> -----Original Message-----
>>>> From: reflector-bounces at tvbf.org 
>>>> [mailto:reflector-bounces at tvbf.org] On
>>>> Behalf Of Grigore Rosu
>>>> Sent: Tuesday, March 07, 2006 3:25 PM
>>>> To: 'Velocity Aircraft Owners and Builders list'
>>>> Subject: REFLECTOR: brake lines
>>>>
>>>> I just finished installing the master cylinders in my SEFG and now 
>>>> I'd like
>>>> to install the nylaflow brake lines.  The manual says that I should 
>>>> drive
>>>> them through the pilot airduct, all the way down till right before the
>>>> firewall, then have each brake line go to its corresponding leg.  I
>>>> understand the big picture, but there are all those details left 
>>>> that are
>>>> not mentioned in the manual, so I'd like to kindly ask those of you 
>>>> who are
>>>> more advanced with their projects for a few more details, even some
>>>> pictures, if possible.
>>>>
>>>> First of all, I found the following picture on Velocity's website:
>>>> http://www.velocityaircraft.com/photos/Fuselage/pages/MG-CABLE-AND-BRAKELINE 
>>>>
>>>> 0088.html
>>>> In this picture, the brake lines seem to leave the airduct way 
>>>> before the
>>>> firewall and are driven through some sort of a tube to the middle 
>>>> of the
>>>> firewall.  This is different from what they said in the manual ...
>>>>
>>>> If I follow the manual, should I simply drill a larger hole in the 
>>>> airduct
>>>> right before the firewall?  Where exactly, in the upper or in the 
>>>> lower part
>>>> of the airduct?  It should not matter for the co-pilot leg, but it 
>>>> seems
>>>> important for the pilot leg; I guess we do not want to bend the 
>>>> brake line
>>>> too much ...
>>>>
>>>> To me, the most natural thing to do seems to drill TWO holes, one 
>>>> for the
>>>> brake line of each leg.  The one for the co-pilot leg would be as 
>>>> low as
>>>> possible, so that the brake line smoothly goes on the bottom of the 
>>>> airplane
>>>> right in front of the firewall to the co-pilot leg.  The other 
>>>> hole, on the
>>>> pilot's side, I would drill through the bottom of the fuselage as 
>>>> close as
>>>> possible to the leg, so that the pilot brake line smoothly goes 
>>>> down the leg
>>>> to the wheel.  What I'm missing here, I guess, is what happens next 
>>>> with
>>>> these nylaflow tubes; how should they transit from the fuselage to 
>>>> the legs
>>>> so that they do not get damaged during landings?
>>>>
>>>> So, what did you do with the brake lines in your airplanes?  Do you 
>>>> have any
>>>> pictures available?  I looked at Andy Millin's pictures, but he 
>>>> seems to
>>>> have an entirely different setting for his brake lines: they are of 
>>>> aluminum
>>>> instead of nylaflow, and they go through the keel instead of 
>>>> through the
>>>> airduct.
>>>>
>>>> Thank you in advance,
>>>> Grigore
>>>>
>>>>
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>>>
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>
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