RV10-List Digest Archive

Tue 04/30/19


Total Messages Posted: 6



Today's Message Index:
----------------------
 
     1. 04:33 AM - Re: Re: Brakes have me stumped (Jack Philips)
     2. 04:57 AM - Brakes (Terry Moushon)
     3. 05:14 AM - Re: Re: Brakes have me stumped (Carlos Trigo)
     4. 11:34 AM - Re: Re: Brakes have me stumped (Jack Philips)
     5. 04:37 PM - Re: Brakes have me stumped (woxofswa)
     6. 06:10 PM - Re: Brakes have me stumped (Bob Turner)
 
 
 


Message 1


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    Time: 04:33:26 AM PST US
    From: "Jack Philips" <jack@bedfordlandings.com>
    Subject: Re: Brakes have me stumped
    Well said, General! As a Seaplane CFI teaching in a Cessna on amphibious floats (which have castering nosewheels steered by braking, just like an RV-10), I spend the first 15 minutes teaching a student just how to taxi the floatplane, and invariably they want to ride the brakes, even on takeoff. On landing, they want to stop quickly and then turn around to back taxi to the ramp (we don't have a taxiway on our runway, so back-taxiing is the norm). I always point out that "runway is cheaper than brakes", and have them gradually slow down, without using the brakes any more than necessary. Part of the problem with the RV-10 brakes is the efficient, fully enclosed wheel pants that don't allow a lot of cooling air to reach the brakes, compared to older designs that usually did not enclose the brakes. Keep that in mind when using your brakes. Jack Phillips Smith Mountain Lake, Virginia RV-10 #40610 - In the Paint Shop. Should fly for the first time in early June -----Original Message----- From: owner-rv10-list-server@matronics.com [mailto:owner-rv10-list-server@matronics.com] On Behalf Of JOHN MILLER Sent: Monday, April 29, 2019 10:41 PM Subject: Re: RV10-List: Re: Brakes have me stumped At the risk of being tard and feathered by the crowd, let me offer a thought on using brakes in GA aircraft, especially RVs. Biggest problem with brakes is usually related to the pilot. Back a long time ago when military brakes were not what they are today, pilots were taught to never ride the brakes . when you need them, step on them and then get your feet off the brakes. Reason was the brakes (and they were disc brakes then) would overheat quickly, which was not a good thing. The pilot risked one of the following: brakes would fade and give no stopping power; brakes would lock up; brake pucks would spring a leak due to heat and start a fire; etc, etc. Mil 6606 brake will burn very hot and fast. Fast forward to today. As a CFI, I am constantly battling pilots who like to ride the brakes .. whether they realize it or not. It is easier to ride the brakes in an RV than in other GA planes just because of the way the pedals are made and how they are installed. It is far too easy to ride the brakes when merely thinking you are only applying rudder when in fact you are inadvertantly applying some brake pressure as well. And how about those long taxi routes to the runway or ramp? Do you ride the brakes to keep your speed constant on a long taxiway? (the wrong way) Or do you let the bird coast (with increasing speed) and then apply brakes quickly to slow down, then immediately get off the brakes and start the coast process again? (the right way) Same thing with slowing down after landing on the runway ,,,,, do you ride the brakes to slow down gradually and then keep your feet on the brakes to turnoff? Or do you apply moderate, constant pressure to start slowing down . and then get off the brakes totally and coast a bit, then reapply brakes again? Remember .. if you get on the brakes (moderate pressure) to use them, and then immediately get off of them, you wont generate near as much head on the disc's as if you use a constant pressure on themI am 12 years on the same MATCO discs and have change pads once. Just saying. Much of the brake problems in the RV's are not who makes the pads or the discs..it is how you use them. Oh, dont forget to let her roll to the far end of the runway to turn off rather than stepping on the brakes to make the closer turnoff whenever you have the option. grumpy N184JM > On Apr 29, 2019, at 2:36 PM, Lenny Iszak <lenard@rapiddecision.com> wrote: > > --> <lenard@rapiddecision.com> > > Clearly visible. Attached some pictures. > > Lenny > > > > digidocs wrote: >> Lenny, >> >> This is very interesting. How did you determine that the discs were warped or was it obvious? Hopefully you've found the issue now! >> >> >> David >> >> >> On Mon, Apr 29, 2019 at 10:10 AM Lenny Iszak wrote: >> >> >>> >>> Mine has been doing that for a while and I think i just now fixed it. >>> The discs were warped and that was overheating the calipers/pads even when not using the brakes. >>> >>> Replacing the discs only didn't help. Adding return springs on the master cylinders didn't help. >>> >>> The pads crack just as well with Matco's SwiftLine pad/shoe that they rivet together themselves. So I doubt it's an oversqueezed rivet problem. Plus the whole pad looks charred by the time it cracks around the rivet holes. >>> >>> This time around I replaced the shoes, pads, the pins, everything. Also put thermocouples on both calipers. AFS has two TIT thermocouples inputs so my caliper temps are showing on the screen. >>> >>> The one thing I learned from that exercise is that when I hold onto the brakes after landing i can see the temps zoom up above 200F in seconds, otherwise they stay below 130F. >>> Just tap them and let go and the heat from the disc won't have time to transfer over to the pads. >>> >>> Lenny >>> >>> -------- >>> Lenny Iszak >>> Palm City, FL >>> 2014 RV-10, N311LZ - 500 hrs >>> >>> >>> >>> >>> Read this topic online here: >>> >>> http://forums.matronics.com/viewtopic.php?p=489001#489001 >>> (http://forums.matronics.com/viewtopic.php?p=489001#489001) >>> >>> >>> >>> >>> >>> >>> ========== >>> -List" rel="noreferrer" >>> target="_blank">http://www.matronics.com/Navigator?RV10-List >>> ========== >>> FORUMS - >>> eferrer" target="_blank">http://forums.matronics.com >>> ========== >>> WIKI - >>> errer" target="_blank">http://wiki.matronics.com >>> ========== >>> b Site - >>> -Matt Dralle, List Admin. >>> rel="noreferrer" >>> target="_blank">http://www.matronics.com/contribution >>> ========== >>> >>> >>> >>> >> > > > -------- > Lenny Iszak > Palm City, FL > 2014 RV-10, N311LZ - 500 hrs > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=489014#489014 > > > > > Attachments: > > http://forums.matronics.com//files/img_0453_752.jpg > http://forums.matronics.com//files/img_0449_175.jpg > http://forums.matronics.com//files/img_0444_471.jpg > > > > > >


    Message 2


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    Time: 04:57:45 AM PST US
    Subject: Brakes
    From: Terry Moushon <tmoushon@gmail.com>
    I am in annual now, and have 400 hours on my 10 with MATCO brakes. Last week I installed new brakes, Michelin Aviators and Michelin Airstop tubes. This is my THIRD set of brake pads. My first set of brakes had a burr on the left brake causing it to not release....and I had to replace early during my phase 1 testing. My second set got me through my instrument rating, 120 taxi miles and about 250 landings (best guess). To walk the piston back into place when installing new brakes, I use a 1/4" x 4" x 2" piece of steel and a C clamp. Turning slowly will walk the Pistons back into place. Using my hand, I can push one piston in, but the other two come out.... Hence, the steel plate. I have Banaco brake lines and a parking brake and have had no issues with those. The only other issue I have seen is leaks, because I did not use Locktite 567 sealant. George at Matco had me try it, and it worked great. I took advantage of Matco's brake replacement service, basically buy two, put one set on the shelf...get small discount, and they assure flatness and install pads.


    Message 3


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    Time: 05:14:30 AM PST US
    From: Carlos Trigo <trigo@mail.telepac.pt>
    Subject: Re: Brakes have me stumped
    Hello Jack and all On the subject of your last paragraph, the wheel pants not letting the brakes to cool as good as they would if no pants were used, why not think in a solution for the brakes cooling with the wheel pants, like for example put some shark grills in the pants, forcing air to cool the brakes? Would this cause any extra drag? Just food for thaught Carlos Enviado do meu iPhone No dia 30/04/2019, s 12:30, Jack Philips <jack@bedfordlandings.com> escreveu: > > Well said, General! As a Seaplane CFI teaching in a Cessna on amphibious floats (which have castering nosewheels steered by braking, just like an RV-10), I spend the first 15 minutes teaching a student just how to taxi the floatplane, and invariably they want to ride the brakes, even on takeoff. On landing, they want to stop quickly and then turn around to back taxi to the ramp (we don't have a taxiway on our runway, so back-taxiing is the norm). I always point out that "runway is cheaper than brakes", and have them gradually slow down, without using the brakes any more than necessary. > > Part of the problem with the RV-10 brakes is the efficient, fully enclosed wheel pants that don't allow a lot of cooling air to reach the brakes, compared to older designs that usually did not enclose the brakes. Keep that in mind when using your brakes. > > Jack Phillips > Smith Mountain Lake, Virginia > RV-10 #40610 - In the Paint Shop. Should fly for the first time in early June > > -----Original Message----- > From: owner-rv10-list-server@matronics.com [mailto:owner-rv10-list-server@matronics.com] On Behalf Of JOHN MILLER > Sent: Monday, April 29, 2019 10:41 PM > To: RV10-List Digest Server <rv10-list@matronics.com> > Subject: Re: RV10-List: Re: Brakes have me stumped > > > At the risk of being tard and feathered by the crowd, let me offer a thought on using brakes in GA aircraft, especially RVs. > > Biggest problem with brakes is usually related to the pilot. > > Back a long time ago when military brakes were not what they are today, pilots were taught to never ride the brakes . when you need them, step on them and then get your feet off the brakes. Reason was the brakes (and they were disc brakes then) would overheat quickly, which was not a good thing. The pilot risked one of the following: brakes would fade and give no stopping power; brakes would lock up; brake pucks would spring a leak due to heat and start a fire; etc, etc. Mil 6606 brake will burn very hot and fast. > > Fast forward to today. As a CFI, I am constantly battling pilots who like to ride the brakes .. whether they realize it or not. It is easier to ride the brakes in an RV than in other GA planes just because of the way the pedals are made and how they are installed. It is far too easy to ride the brakes when merely thinking you are only applying rudder when in fact you are inadvertantly applying some brake pressure as well. > > And how about those long taxi routes to the runway or ramp? Do you ride the brakes to keep your speed constant on a long taxiway? (the wrong way) > > Or do you let the bird coast (with increasing speed) and then apply brakes quickly to slow down, then immediately get off the brakes and start the coast process again? (the right way) > > Same thing with slowing down after landing on the runway ,,,,, do you ride the brakes to slow down gradually and then keep your feet on the brakes to turnoff? > > Or do you apply moderate, constant pressure to start slowing down . and then get off the brakes totally and coast a bit, then reapply brakes again? > > Remember .. if you get on the brakes (moderate pressure) to use them, and then immediately get off of them, you wont generate near as much head on the disc's as if you use a constant pressure on themI am 12 years on the same MATCO discs and have change pads once. > > Just saying. Much of the brake problems in the RV's are not who makes the pads or the discs..it is how you use them. > > Oh, dont forget to let her roll to the far end of the runway to turn off rather than stepping on the brakes to make the closer turnoff whenever you have the option. > > grumpy > N184JM > >> On Apr 29, 2019, at 2:36 PM, Lenny Iszak <lenard@rapiddecision.com> wrote: >> >> --> <lenard@rapiddecision.com> >> >> Clearly visible. Attached some pictures. >> >> Lenny >> >> >> >> digidocs wrote: >>> Lenny, >>> >>> This is very interesting. How did you determine that the discs were warped or was it obvious? Hopefully you've found the issue now! >>> >>> >>> David >>> >>> >>> On Mon, Apr 29, 2019 at 10:10 AM Lenny Iszak wrote: >>> >>> >>>> >>>> Mine has been doing that for a while and I think i just now fixed it. >>>> The discs were warped and that was overheating the calipers/pads even when not using the brakes. >>>> >>>> Replacing the discs only didn't help. Adding return springs on the master cylinders didn't help. >>>> >>>> The pads crack just as well with Matco's SwiftLine pad/shoe that they rivet together themselves. So I doubt it's an oversqueezed rivet problem. Plus the whole pad looks charred by the time it cracks around the rivet holes. >>>> >>>> This time around I replaced the shoes, pads, the pins, everything. Also put thermocouples on both calipers. AFS has two TIT thermocouples inputs so my caliper temps are showing on the screen. >>>> >>>> The one thing I learned from that exercise is that when I hold onto the brakes after landing i can see the temps zoom up above 200F in seconds, otherwise they stay below 130F. >>>> Just tap them and let go and the heat from the disc won't have time to transfer over to the pads. >>>> >>>> Lenny >>>> >>>> -------- >>>> Lenny Iszak >>>> Palm City, FL >>>> 2014 RV-10, N311LZ - 500 hrs >>>> >>>> >>>> >>>> >>>> Read this topic online here: >>>> >>>> http://forums.matronics.com/viewtopic.php?p=489001#489001 >>>> (http://forums.matronics.com/viewtopic.php?p=489001#489001) >>>> >>>> >>>> >>>> >>>> >>>> >>>> ========== >>>> -List" rel="noreferrer" >>>> target="_blank">http://www.matronics.com/Navigator?RV10-List >>>> ========== >>>> FORUMS - >>>> eferrer" target="_blank">http://forums.matronics.com >>>> ========== >>>> WIKI - >>>> errer" target="_blank">http://wiki.matronics.com >>>> ========== >>>> b Site - >>>> -Matt Dralle, List Admin. >>>> rel="noreferrer" >>>> target="_blank">http://www.matronics.com/contribution >>>> ========== >>>> >>>> >>>> >>>> >>> >> >> >> -------- >> Lenny Iszak >> Palm City, FL >> 2014 RV-10, N311LZ - 500 hrs >> >> >> >> >> Read this topic online here: >> >> http://forums.matronics.com/viewtopic.php?p=489014#489014 >> >> >> >> >> Attachments: >> >> http://forums.matronics.com//files/img_0453_752.jpg >> http://forums.matronics.com//files/img_0449_175.jpg >> http://forums.matronics.com//files/img_0444_471.jpg >> >> >> >> >> >> > > > > > > > > > >


    Message 4


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    Time: 11:34:55 AM PST US
    From: "Jack Philips" <jack@bedfordlandings.com>
    Subject: Re: Brakes have me stumped
    Carlos, Having just gone through all the filling and sanding to get the wheel pants ready to paint, I can't imagine working around cooling vents when doing that! I think General Grumpy put his finger on it - just stay off the brakes as much as possible, and NEVER ride them. Jack Phillips Just finished the Condition Inspection on my other airplane - a Pietenpol Air Camper -----Original Message----- From: owner-rv10-list-server@matronics.com [mailto:owner-rv10-list-server@matronics.com] On Behalf Of Carlos Trigo Sent: Tuesday, April 30, 2019 8:14 AM Subject: Re: RV10-List: Re: Brakes have me stumped Hello Jack and all On the subject of your last paragraph, the wheel pants not letting the brakes to cool as good as they would if no pants were used, why not think in a solution for the brakes cooling with the wheel pants, like for example put some shark grills in the pants, forcing air to cool the brakes? Would this cause any extra drag? Just food for thaught Carlos Enviado do meu iPhone No dia 30/04/2019, s 12:30, Jack Philips <jack@bedfordlandings.com> escreveu: > --> <jack@bedfordlandings.com> > > Well said, General! As a Seaplane CFI teaching in a Cessna on amphibious floats (which have castering nosewheels steered by braking, just like an RV-10), I spend the first 15 minutes teaching a student just how to taxi the floatplane, and invariably they want to ride the brakes, even on takeoff. On landing, they want to stop quickly and then turn around to back taxi to the ramp (we don't have a taxiway on our runway, so back-taxiing is the norm). I always point out that "runway is cheaper than brakes", and have them gradually slow down, without using the brakes any more than necessary. > > Part of the problem with the RV-10 brakes is the efficient, fully enclosed wheel pants that don't allow a lot of cooling air to reach the brakes, compared to older designs that usually did not enclose the brakes. Keep that in mind when using your brakes. > > Jack Phillips > Smith Mountain Lake, Virginia > RV-10 #40610 - In the Paint Shop. Should fly for the first time in > early June > > -----Original Message----- > From: owner-rv10-list-server@matronics.com > [mailto:owner-rv10-list-server@matronics.com] On Behalf Of JOHN MILLER > Sent: Monday, April 29, 2019 10:41 PM > To: RV10-List Digest Server <rv10-list@matronics.com> > Subject: Re: RV10-List: Re: Brakes have me stumped > > > At the risk of being tard and feathered by the crowd, let me offer a thought on using brakes in GA aircraft, especially RVs. > > Biggest problem with brakes is usually related to the pilot. > > Back a long time ago when military brakes were not what they are today, pilots were taught to never ride the brakes . when you need them, step on them and then get your feet off the brakes. Reason was the brakes (and they were disc brakes then) would overheat quickly, which was not a good thing. The pilot risked one of the following: brakes would fade and give no stopping power; brakes would lock up; brake pucks would spring a leak due to heat and start a fire; etc, etc. Mil 6606 brake will burn very hot and fast. > > Fast forward to today. As a CFI, I am constantly battling pilots who like to ride the brakes .. whether they realize it or not. It is easier to ride the brakes in an RV than in other GA planes just because of the way the pedals are made and how they are installed. It is far too easy to ride the brakes when merely thinking you are only applying rudder when in fact you are inadvertantly applying some brake pressure as well. > > And how about those long taxi routes to the runway or ramp? Do you > ride the brakes to keep your speed constant on a long taxiway? (the > wrong way) > > Or do you let the bird coast (with increasing speed) and then apply > brakes quickly to slow down, then immediately get off the brakes and > start the coast process again? (the right way) > > Same thing with slowing down after landing on the runway ,,,,, do you ride the brakes to slow down gradually and then keep your feet on the brakes to turnoff? > > Or do you apply moderate, constant pressure to start slowing down . and then get off the brakes totally and coast a bit, then reapply brakes again? > > Remember .. if you get on the brakes (moderate pressure) to use them, and then immediately get off of them, you wont generate near as much head on the disc's as if you use a constant pressure on themI am 12 years on the same MATCO discs and have change pads once. > > Just saying. Much of the brake problems in the RV's are not who makes the pads or the discs..it is how you use them. > > Oh, dont forget to let her roll to the far end of the runway to turn off rather than stepping on the brakes to make the closer turnoff whenever you have the option. > > grumpy > N184JM > >> On Apr 29, 2019, at 2:36 PM, Lenny Iszak <lenard@rapiddecision.com> wrote: >> >> --> <lenard@rapiddecision.com> >> >> Clearly visible. Attached some pictures. >> >> Lenny >> >> >> >> digidocs wrote: >>> Lenny, >>> >>> This is very interesting. How did you determine that the discs were warped or was it obvious? Hopefully you've found the issue now! >>> >>> >>> David >>> >>> >>> On Mon, Apr 29, 2019 at 10:10 AM Lenny Iszak wrote: >>> >>> >>>> >>>> Mine has been doing that for a while and I think i just now fixed it. >>>> The discs were warped and that was overheating the calipers/pads even when not using the brakes. >>>> >>>> Replacing the discs only didn't help. Adding return springs on the master cylinders didn't help. >>>> >>>> The pads crack just as well with Matco's SwiftLine pad/shoe that they rivet together themselves. So I doubt it's an oversqueezed rivet problem. Plus the whole pad looks charred by the time it cracks around the rivet holes. >>>> >>>> This time around I replaced the shoes, pads, the pins, everything. Also put thermocouples on both calipers. AFS has two TIT thermocouples inputs so my caliper temps are showing on the screen. >>>> >>>> The one thing I learned from that exercise is that when I hold onto the brakes after landing i can see the temps zoom up above 200F in seconds, otherwise they stay below 130F. >>>> Just tap them and let go and the heat from the disc won't have time to transfer over to the pads. >>>> >>>> Lenny >>>> >>>> -------- >>>> Lenny Iszak >>>> Palm City, FL >>>> 2014 RV-10, N311LZ - 500 hrs >>>> >>>> >>>> >>>> >>>> Read this topic online here: >>>> >>>> http://forums.matronics.com/viewtopic.php?p=489001#489001 >>>> (http://forums.matronics.com/viewtopic.php?p=489001#489001) >>>> >>>> >>>> >>>> >>>> >>>> >>>> ========== >>>> -List" rel="noreferrer" >>>> target="_blank">http://www.matronics.com/Navigator?RV10-List >>>> ========== >>>> FORUMS - >>>> eferrer" target="_blank">http://forums.matronics.com >>>> ========== >>>> WIKI - >>>> errer" target="_blank">http://wiki.matronics.com >>>> ========== >>>> b Site - >>>> -Matt Dralle, List Admin. >>>> rel="noreferrer" >>>> target="_blank">http://www.matronics.com/contribution >>>> ========== >>>> >>>> >>>> >>>> >>> >> >> >> -------- >> Lenny Iszak >> Palm City, FL >> 2014 RV-10, N311LZ - 500 hrs >> >> >> >> >> Read this topic online here: >> >> http://forums.matronics.com/viewtopic.php?p=489014#489014 >> >> >> >> >> Attachments: >> >> http://forums.matronics.com//files/img_0453_752.jpg >> http://forums.matronics.com//files/img_0449_175.jpg >> http://forums.matronics.com//files/img_0444_471.jpg >> >> >> >> >> >> > > > > > > > > > >


    Message 5


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    Time: 04:37:35 PM PST US
    Subject: Re: Brakes have me stumped
    From: "woxofswa" <woxof@aol.com>
    Interesting thread. I have the original Cleveland brakes. Everything g ok through 600 hours but I am about to install my third set of pads. One thing I have found very interesting involves buying pads. I always try and buy from Vans just to keep the home fires burning plus they usually have fair prices. Shopping for the 66-112 pads for the Clevelands however, Vans has jacked their prices through the roof. More than twice what they sell other pads for and more than twice what the pads (rapco version) sell for from Spruce. Just thought that was curious. -------- Myron Nelson Mesa, AZ Flew May 10 2014 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=489029#489029


    Message 6


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    Time: 06:10:27 PM PST US
    Subject: Re: Brakes have me stumped
    From: "Bob Turner" <bobturner@alum.rpi.edu>
    The simple truth is, brakes generate a lot of heat. Sure, you could make them much larger and heavier, but who wants to do that. Even without fairings, air cooling is pretty ineffective (unless you can make a rotor with lots of fins, like on your cylinders!). Large jet aircraft have no fairings (since they're retractable) and it's pretty common to have the brakes sized for just one maximum effort stop, after which the plane has to be parked until the brakes cool down. -------- Bob Turner RV-10 QB Read this topic online here: http://forums.matronics.com/viewtopic.php?p=489032#489032




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