Air cooling flow help
10-20-2011, 08:09 PM
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Air cooling flow help
Hello
I am scratch building a DC3 C47 and it is going to be electric powered with twin Turnigy SK3548-1100kv motors with twin 80amp speed controllers and one Turnigy 4 cell 20-30c 5000mah lipo .
the problem is I have to mount the battery in the nose of the plane and it needs cooling air .
Question is if I cut out all the windows in the cock pit and sides and use black screen for the windows would the air flow threw the plane effect the planes performance in flight .
thank you.
I am scratch building a DC3 C47 and it is going to be electric powered with twin Turnigy SK3548-1100kv motors with twin 80amp speed controllers and one Turnigy 4 cell 20-30c 5000mah lipo .
the problem is I have to mount the battery in the nose of the plane and it needs cooling air .
Question is if I cut out all the windows in the cock pit and sides and use black screen for the windows would the air flow threw the plane effect the planes performance in flight .
thank you.
10-21-2011, 05:13 AM
#3
RE: Air cooling flow help
Just from a purely visual point of veiw that would seem to be a really ugly way to do it. Doing a cheat with Duvateen screen would just be so obvious and look awful since the cockpit area is one of the areas of that airplane that the eyes are first draw to when looking at it.
Would seem much better to do an underside chin NASA type inlet. My preferrance would to also compartmentalize the battery airflow so the airflow is isolated from the rest of the airplane interior. Providing the Nasa inlet and an appropriate outlet a little further aft underneath.
John
Would seem much better to do an underside chin NASA type inlet. My preferrance would to also compartmentalize the battery airflow so the airflow is isolated from the rest of the airplane interior. Providing the Nasa inlet and an appropriate outlet a little further aft underneath.
John
10-21-2011, 11:46 AM
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RE: Air cooling flow help
ORIGINAL: JohnBuckner
Just from a purely visual point of veiw that would seem to be a really ugly way to do it. Doing a cheat with Duvateen screen would just be so obvious and look awful since the cockpit area is one of the areas of that airplane that the eyes are first draw to when looking at it.
Would seem much better to do an underside chin NASA type inlet. My preferrance would to also compartmentalize the battery airflow so the airflow is isolated from the rest of the airplane interior. Providing the Nasa inlet and an appropriate outlet a little further aft underneath.
John
Just from a purely visual point of veiw that would seem to be a really ugly way to do it. Doing a cheat with Duvateen screen would just be so obvious and look awful since the cockpit area is one of the areas of that airplane that the eyes are first draw to when looking at it.
Would seem much better to do an underside chin NASA type inlet. My preferrance would to also compartmentalize the battery airflow so the airflow is isolated from the rest of the airplane interior. Providing the Nasa inlet and an appropriate outlet a little further aft underneath.
John
10-21-2011, 12:53 PM
#5
RE: Air cooling flow help
Replacing the windows with a screen won't help any airflow, even leaving the windows out completely will not influence any airflow. It will look slightly better than the screen idea, but to get air to flow, you need to think much more about the OUTLET, not the inlet. Your battery needs to be in the direct flow, so some sort of duct will need to built, to encourage the air to actually flow around the pack. As you expect the the air to cool the pack, then the air will be warmed, so the outlet of the duct must be bigger, at least 2x the inlet, so that the warm air will not prevent the cool air entering the duct. Perhaps mounting the pack in the cabin is not such a good idea, a removeable 'pan' under the wing centre section containing the battery and the cooling duct with entry and exit might be both easier, less obtrusive, and more accessable. Just FWIW.
Evan, WB #12.
Evan, WB #12.
10-21-2011, 01:02 PM
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RE: Air cooling flow help
ORIGINAL: pimmnz
Replacing the windows with a screen won't help any airflow, even leaving the windows out completely will not influence any airflow. It will look slightly better than the screen idea, but to get air to flow, you need to think much more about the OUTLET, not the inlet. Your battery needs to be in the direct flow, so some sort of duct will need to built, to encourage the air to actually flow around the pack. As you expect the the air to cool the pack, then the air will be warmed, so the outlet of the duct must be bigger, at least 2x the inlet, so that the warm air will not prevent the cool air entering the duct. Perhaps mounting the pack in the cabin is not such a good idea, a removeable 'pan' under the wing centre section containing the battery and the cooling duct with entry and exit might be both easier, less obtrusive, and more accessable. Just FWIW.
Evan, WB #12.
Replacing the windows with a screen won't help any airflow, even leaving the windows out completely will not influence any airflow. It will look slightly better than the screen idea, but to get air to flow, you need to think much more about the OUTLET, not the inlet. Your battery needs to be in the direct flow, so some sort of duct will need to built, to encourage the air to actually flow around the pack. As you expect the the air to cool the pack, then the air will be warmed, so the outlet of the duct must be bigger, at least 2x the inlet, so that the warm air will not prevent the cool air entering the duct. Perhaps mounting the pack in the cabin is not such a good idea, a removeable 'pan' under the wing centre section containing the battery and the cooling duct with entry and exit might be both easier, less obtrusive, and more accessable. Just FWIW.
Evan, WB #12.
