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Steve came over a couple days ago to help me think through the layout of a duct and where to place the radiators. The Delta has an open wheel well, per the plans, and we eventually lighted on the idea of taking advantage of that. The pictures below are my first attempt. One of these will go on each side
The idea is to clean up the turn into the wheel well to pull in more air, and then provide a scoop at the rear to keep the air in. With the wheel down, that will give an intake area of 100in^2, though it won't be facing directly into the wind. When the wheels come up, they will act as cowl flaps to block some of that air. How much it will block, I'm not sure. But I will have some control of it through tire selection, and the size of the scoop. This is probably the most experimental part of it. The worst case scenario is that I build the scoop to small and have to fly around with the wheels down.
The piece of green painted foam represents the radiator. I have room for about 9"x13"x3" of radiator, if I lay it in at a 30degree angle. I have the ability to pull in a lot of air, so I'm leaning toward a radiator on the thicker size (haven't actually picked one out yet).
The air will exit at the rear, just before the trailing edge. I've made an attempt to round the exit so that the air comes out moving in the general direction of the slipstream. With any luck, the extra air will give a little more elevon authority on landings. They tend to get washed out in nose high operations.
I think the general idea is sound, but the devil is always in the details. My biggest question at this point is whether to choke the intake down and then back up in a K&W profile, or just leave it open. --
This is by far the hardest lesson about freedom. It goes against
instinct, and morality, to just sit back and watch people make
mistakes. We want to help them, which means control them and their
decisions, but in doing so we actually hurt them (and ourselves)."
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