Greetings! Earlier in the thread, there was a request to hear from remote participants. I remained remote for this meeting as the distance to travel added too much away time in total. I am planning to be in San Francisco. In the past, I did stay up all hours to attend meetings. This was because of a direct responsibility as an AD at the time. For this meeting, I attended all sessions where I was a chair or presenting. I had co-chairs in the room or this would not have been possible. The presentation went well with me remote (my perception), but I did have someone in the room in case that helped. I’m going to watch the recordings of meetings that happened in the very late hours and of course something is missed. I do think we can achieve more remotely, but we need to work together for that to be possible. Michael’s suggestion for plenary meetings makes sense. I also appreciate WGs that meet frequently in between meetings as that lessens the need for travel too. The only problem with that (for me) is that I have a standing conflict with one of them and gave to decide each week what to attend. I do think we can do better. We have to be willing. Best regards, Kathleen Sent from my mobile device > On Apr 1, 2023, at 6:25 AM, John Levine <johnl@xxxxxxxxx> wrote: > > It appears that Hesham ElBakoury <helbakoury@xxxxxxxxx> said: >> >> Hydrogen-powered planes were voted as one of breakthrough technologies this >> year. > > Not by anyone who understands the physics. To get a useful amount of > H2 in a reasonable volume, it's compressed to 700 bar (10,000 psi) > which requres a big heavy tank to contain it. Unlike kerosene, H2 > is extremely flammable if it leaks; 4% in air can explode. > > Even if someone figured out how to make the big heavy tank fit in > an airplane, would you like to ride in a flying bomb? I wouldn't. > > Battery planes with rarely used jet fuel range backup might make sense > if you can deal with the weight of both the battery system, electric > motors driving some kind of propellor, and the fuel system, probably > something like an existing jet engine. I'm not holding my breath for > that, either. > > I have seen claims about planes running on biodiesel made from > plant and food waste but scaling that up will be a challenge. > > I would rather the IETF stick to plausible technology and start > with realistic models of the carbon budgets for our meetings and > how they would change if we changed the way we met. > > R's, > John >
