REFLECTOR: Cruise speed "Speed Brake"

[Scott Derrick]

I think the standard speed brake is limited to 120 knot extension 
speed.  Which limits its uses to in the pattern.

Has anybody experimented with beefing it up to allow higher speed 
extensions?  Like 175 knots?  This would make it a true speed brake. 

I would like something I could deploy at cruise to enable a cruise speed 
descent without shock cooling the engine.

What would you think would be needed to do this?  bigger hinges? bigger 
actuator?  carbon fiber door?

Scott

Scott Derrick wrote:

> Are you using both lines for ground or just one.
>
> I hadn't thought about using copper lines,  per Al's numbers that 
> would provide over 1/2 again the conducting capability over aluminum.
>
> I will try to find the burst pressure for soft copper tube..
>
> Scott
>
>
> AnnSam wrote:
>
>> My plane was completed in the end of 93 and I ran 2, 1/2 inch copper 
>> lines
>> which have been used as my ground conductor as well as the oil cooler 
>> lines.
>> My plus line is a #2 conductor
>> and I've never had any starting problems.
>>
>> -----Original Message-----
>> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On
>> Behalf Of Scott Derrick
>> Sent: Saturday, September 03, 2005 11:04 AM
>> To: Velocity Aircraft Owners and Builders list
>> Subject: REFLECTOR: Oil lines and ground wire.
>>
>>
>> My plane came with high pressure hoses for oil lines. Both ran in the
>> pilot side duct.  I noticed that the manual calls for 1/2 " aluminum
>> lines.   I was considering replacing the high pressure rubber/steel flex
>> lines with aluminum.  Much lighter and smaller, those hydraulic lines
>> are huge and heavy.
>>
>> I was also considering running one up the pilot side and the other down
>> the copilot side to take advantage of the additional cooling benefits.
>> Has anybody done the comparison of running both in one duct and one in
>> each to see if there really is an advantage?
>>
>> Then I got to thinking about using the oil lines for my ground return
>> path from the battery to the engine?  Aluminum is a pretty good
>> conductor, and having two lines would seem to provide a substantial
>> return path if I bonded both tubes at both ends?
>>
>> Anybody do this?
>>
>> Scott
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>>  
>>
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