|SR 71||06/08/2020 08:38:24|
463 forum posts
Its all very technical, why dont you just make an airflow through it, try it, if it dont get hot you have cracked it, vent it through the cockpit so you dont have to cut holes in the fuselage, simple
|Ron Gray||06/08/2020 08:44:04|
|2320 forum posts|
Personally I wouldn’t worry about cooling for the battery, it shouldn’t get that hot, if it does then something is wrong with the leccy setup. I would look to see if the esc could fit inside the cowl, if it can then as long as you have an exit for the air then there will be sufficient cooling for it. If it has to go as you’ve shown in your illustration then can you cut an air exit hole just in front of b/b? I do like to keep things simple and not over think them.
|Robin Colbourne||06/08/2020 11:54:03|
640 forum posts
This is more or less what aircraft engines do; they don't just sit in a big empty space under the cowling. If you look at a Lycoming or Continental, the air is forced past the cooling fins by ducting and shrouds, then exits into a low pressure area to encourage the flow. Ideally the exiting air should be warm, which shows it is taking the heat with it.
|Richard Clark 2||06/08/2020 12:43:07|
|426 forum posts||
1) Maybe because a superbeing in the sky in which some believe likes it that way
AFAIK that's the only 'deeper' answer that exists at present. I would add that there does not HAVE to be a 'reason' for things. Some things do have a reason but it's not essential. Believing a reason is essential is merely an artefact of human linear thinking. (EG: Having got ourselves stuck with the 'big bang' hypothesis we are now saddled with looking for a probably non-existent cause of it. We just can't help it.)
2) I will try again to the best of my (limited) ability. The cause of the heat is 1 above. It's inherent in the process and it occurs in the motor coils, which are internal. That heat conducts and radiates to the surface of the motor It doesn't stop the process, which is constant and at a given current and load stays unchanged whatever you do. That you pass the conducted/radiated heat to the air by fitting a heatsink and letting air flow though it doesn't slow the process as it can only deal with what is the effect of the process, not the process itself. It may stop the motor from melting but that's all, it doesn't change point 1.
The 'proper' way to do this stuff is to not get into the areas of operation where these unwanted effects become significant, which is where I started. Cut your hole and be happy
PS: I usea discarded inrunner EDF motor in my 65 inch Aeronca Sedan. They work fine on big props instead of small fans with the lower current caused by the much smaller number of cells and work in their maximum efficiency area so don't get hot. The only way the air gets out on mine is the little slit where the 'real' exhausts poke out.
Edited By Richard Clark 2 on 06/08/2020 13:26:42
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