|
|
David Leonard wrote:
Why is it going slower? BECAUSE YOU HAVE DESIGNED YOUR THIN RADIATOR SYSTEM
DUCTS SUCH THAT AN EQUAL AMOUNT OF AIR PASSES THROUGH AN EQUAL VOLUME OF
RADIATOR AS WOULD OCCUR ON A THICK RADIATOR SYSTEM. (This is the big if...
system design... but bear with me). ie, equal amount of air, equal volume
of radiator - in the thin radiator system the air will be flowing more
slowly.
I agree with your concept, Dave, but I think you underestimate the difficulty of fitting a large faced radiator into the physical constraints of the area available in a small airplane. I worked on trying to use a large, 1" thick radiator for a while, and this was in a delta planform. I had comparitively HUGE amounts of volume to work with. I eventually gave up, as there was just no reasonable way to get a duct built around it that would slow the air down. As you increase the face area, you increase the size of the duct necessary to expand the air without separation. The best radiator and duct ever created will be useless if we have to leave it on the ground because it doesn't fit in the airplane.
I think the flow chart for sizing a radiator for our needs should follow something like this:
1) Mark out a space for the largest volume that you can fit a radiator and its associated ducting into. Insure that routing for the hoses will be convenient, and the ducting can be made something resembling efficient.
2) Visit one of the websites like frigidair.com and find a radiator that meets the dimensional specs you came up with. Or contact Jerry and have him make you one of that size.
3) If the core volume is less than 700 cubic inches, add another.
4) Go fly. If it is to cool (<160F), choke off the inlet a little. If it is to hot (>200F), fiddle with the ducting.
|
|