Vought pilots had never seen nor worn crash helmets. Wearing them would give protection if at high speeds the plane hit an air pocket. When I put in a request for a hard hat, Purchasing could not find a supplier. The military had not accepted hard hats yet. When they did, such hard helmets were plentiful. But that was not until late 1946, several months after my request. For me, having played football at an eastern college, I was able to get surplus football helmets from my school's athletic department. The electrical shop at Chance Vought wired them for 2 way radio. That was as close as we got to hard hats. Although gaudy, they worked. I've kept (actually my mother kept) my primitive helmet, and it generates many questions at book signings.
If you haven't heard of AM/FM radio, you may want to get out more. AM/FM , more commonly FM, radio is a daily part of most American's lives. They're used in almost every vehicle, portable radios are used by joggers, alarm clocks, etc. You've probably heard a test of the emergency broadcast system on the radio. It comes across as an irritating buzzing noise followed by a message stating something to the effect of "This has been a test of the emergency broadcast system". In an emergency situation, you will most likely be hearing important information on most FM stations.
It can be a pain walkie talkies to do this manually especially when you simply want to focus on talking and communicating. So do yourself a feature by making sure that the unit you get is working with you to ensure longer battery life.
Another feature that you should closely look into when you are purchasing walkie talkie headsets is the sound quality. It does not have to be as good as Bose. After all, it is just a toy, but you still need good quality nonetheless.
That said, when you're out browsing and shopping for an FRS radio, try to make sure that the product you get has at least these 3 significant features.
Back to that sticky air, as it slows down it starts to be influenced! The air over a river is colder still and moves with that river. A wood or dam is cold. You will move with or towards these cool areas and that allows you a little bit of steerage.
To test the new F4U-5's above 40,000 ft., our pilots needed hard hats, pressurized cockpits, and ejection seats. Ironically for three to four months in we had radio communications none of those three necessities!
And yes, children do still use "walkie-talkie" two portable radio radios. Surprisingly, they still enjoy it just as much as we did, too! Perhaps this is one invention that will outlive us all!