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  #11  
Old 05-10-2021, 05:01 PM
Jake14 Jake14 is offline
 
Join Date: May 2014
Location: Seattle
Posts: 389
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just as a follow-up, I finally got around to installing the Matco parking brake valve. Fairly straightforward with the 2 additional Aircraft Specialty hoses and works great.

A nice benefit is that you can jump start the airplane. set the parking brake and get out to disconnect the cables without shutting off the engine or asking someone else to endanger themselves close to the prop. The PB holds the airplane up to a static rpm of around 2400

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Last edited by Jake14 : 05-10-2021 at 08:51 PM.
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  #12  
Old 05-10-2021, 09:28 PM
Bicyclops Bicyclops is offline
 
Join Date: Oct 2012
Location: LA, California
Posts: 381
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First, jump starting the airplane is usually a bad idea. Launching with a discharged battery can heat the alternator and/or battery to failure. Burn out a couple of diodes and you've got the proverbial "total electrical failure" with a dead battery as backup.

Parking brakes are real handy and be aware that setting it when the brakes are hot can make it hard to get the brake to release when it's time to go. Ask me how I know.

Ed Holyoke
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  #13  
Old 05-11-2021, 01:53 AM
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rv8ch rv8ch is online now
 
Join Date: Feb 2005
Location: LSGY
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Quote:
Originally Posted by Jake14 View Post
... set the parking brake and get out to disconnect the cables without shutting off the engine or asking someone else to endanger themselves close to the prop. ...
I've accidentally bumped the controls getting into or out of an aircraft - please be careful, that could be the start of a bad day if it happens with the engine running and you just fell out of it onto the ramp.
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Last edited by rv8ch : 05-11-2021 at 04:21 AM.
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  #14  
Old 05-11-2021, 05:55 AM
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Walt Walt is offline
 
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Location: Dallas/Ft Worth, TX
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Leaving brake pressure applied for an extended period may have undesirable results. You should always chock and release PB.
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  #15  
Old 05-11-2021, 08:12 AM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
Location: Southwest
Posts: 1,819
Default Being a Little Civil

A little bit of civil engineering.

Without taking into account the wind, for every sloped surface there is an orientation of the plane where it will not roll. And an orientation of the plane where if rolls really fast. So if a pilot does not have a parking brake, he can point the plane in a direction that does not cause a roll, get out and secure a wheel, and then re orientate the plane.

If there is wind, this doesn't always work. That is why I am installing a parking brake.
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  #16  
Old 05-11-2021, 07:54 PM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
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Quote:
Originally Posted by PilotjohnS View Post
A little bit of civil engineering.

Without taking into account the wind, for every sloped surface there is an orientation of the plane where it will not roll. And an orientation of the plane where if rolls really fast. So if a pilot does not have a parking brake, he can point the plane in a direction that does not cause a roll, get out and secure a wheel, and then re orientate the plane.

If there is wind, this doesn't always work. That is why I am installing a parking brake.
When I lived on the east coast, I could always count on rolling the tailwheel into the grass before shutdown. West coast, that isnít always an option, as the concrete often has a pretty good step into the gravel.. Also the winds out west donít always allow for it either. Iím still hesitant to install a parking brake on a tailwheel aircraft.. for one, I donít care to start the engine on a tailwheel with the brake set. If the throttle is too much, or gets bumped, I could see it going over. By holding the brakes, you could release pressure and that may prevent or slow the tail rise. I also had a friend doing phase one for a builder who installed the PB, but didnít tell the pilot, and didnít hook up the cable to the lever. After one of the flights, the plane came to a stop and couldnít be rolled clear of the runway. Turns out the lever vibrated or was moved somehow to the closed position and when he applied brakes, the valve trapped the pressure. I cringe thinking what could have happened if the pilot was in the habit of ďtestingĒ the brakes on short final..
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