The rad core width is 17.25, and the length as been changed. Full length is 24.25” (423 sq in) . The length (not covered) was first tested at 17.75 " (306 sq in) . The final length (not covered) was
12.625” (218 sq in) . HALF the original radiator. The core is 2.25” thick if anyone is
doing the math . The
other thing to consider is that the covered portion of the radiator is only
covered on the front side. The back side is open. While there is no
air passing through, turbulent air around the back side will still be removing
some heat from the covered section. There is also a 2" thick oil
cooler behind the uncovered area of radiator, so overall, this is about
4.5" thick.
Here is a chart of inlet, rad size, and temps for climb at around
100- 110 mph. The cheek outlet is fixed at about 66 sq
in, and the bottom opening is
about 83 sq in. OAT is
ground temp, not in-flight.
Date
|Inlet (sq in)| Rad core (sq
in) | water temp F | oil temp F | OAT |
comments
80 |
423 | <180 (t-stat) | 180 | 80
| bottom outlet open
80 |
306 | <180 (t-stat) | 180 | 80 | bottom outlet open
10-18 | 48 |
306 |
180 (no t-stat) | 230 | 75
10-18 | 80 |
218 |
160 (no-t-stat) | 185 (not max?) |
70
10-19 | 80 | 218
| 160 (no-t-stat) |
220+
| 80
11-01 | 80
| 218
| 160 (no t-stat) |
200
| 80 | bottom outlet open
My current (changes every week)
plan is to go with a core that is still 2.25" thick, but gives me about 300 sq
inches of frontal area. That will be more than I need now, but
since I'll be putting the oil cooler in front of it to lower the oil temps,
I'll need more radiator than I do now.
One final comment about expensive
radiators, I wouldn't buy one, unless you have a very good reason to believe it
will be just what you need. For example, I'll be retiring an $800+ dollar
radiator with my rev-2 cowl.
Cheers,
Rusty