REFLECTOR: how hot is too hot?

[Douglas Holub]

The Tg for EZ-84 is 151 F for room temperature cure, 196 F after a post-cure. I wonder if the hot rotors post cure the gear legs.

Doug
  ----- Original Message ----- 
  From: Jeff Barnes 
  To: Velocity Aircraft Owners and Builders list 
  Sent: Sunday, June 21, 2009 10:05 PM
  Subject: Re: REFLECTOR: how hot is too hot?


        Hi Doug, 

              Too hot is relative. It is the TG is the epoxy of the gear leg and/or whell pants, meaning if you're safely under it, yuo're OK.

               If gear leg expoxy is Velocipoxy, I believe that is around 140, but that can go up bit by bit as it is "post cured" by your hot rotors, but it won't go a lot higher.  

              Maybe someone can chime in with the actual TG, and/or with actual rotor temp measurements if you got 'em.

        Regards,

        Jeff Barnes




        --- On Sun, 6/21/09, Douglas Holub <douglas.holub at gmail.com> wrote:


          From: Douglas Holub <douglas.holub at gmail.com>
          Subject: REFLECTOR: how hot is too hot?
          To: reflector at tvbf.org
          Date: Sunday, June 21, 2009, 8:17 PM


          I put my wheel pants back on to protect my prop from FOD, and now, of course, the rotors are getting hotter after taxiing. I've got a NACA scoop on the pants that blows air past the rotors, and I've got vents on the top of the pants to let the hot air escape when the plane is parked. I also loosened up my bellvile washer a little to make it easier to steer, and that seems to have helped the rotor temperature.

          After the horror stories I've heard, since I started flying this Velocity I've been worried about the rotors getting too hot and softening the gear legs. I've got fiberfrax and foil tape around the left gear leg and just foil tape around the right gear leg (because there wasn't room for the fiberfrax.) I routinely touch the rotors soon after I park to see how hot they're getting. They were normally never to hot too touch. With the wheel pants they are hotter, but after loosening the Bellville washer I don't burn my finger when I touch them. I think the threshold for heat pain on your fingers is around 120 fahrenheit.

          My question is, "How hot have the rotors been for people who have had gear leg problems?"  Didn't I read once where someone's rotors were actually glowing red? If my rotors don't get over 150 F I don't think I've got anything to worry about.

          Doug Holub

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