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Finn,
Dave’s advice is spot on. Most of these companies will build what you need for only a little more money then retail. You tell them core / tank size, fitting size, air bleed, drain location, additional angle for defuser mounting, etc.. Build a mock-up out of cheap thin foam board, 5 minute epoxy and toothpicks to determine fit up. Thrift store foam works great for about $1.00 a sheet. Lightweight and sturdy. Make a sketch for the manufacture to build the heat exchanger. 500-600 cu in is a good range for a non-boosted two rotor. With a reasonable duct and defuser you can expect between 80F-110F air delta T. Some have had better results. This is where Ed’s workbook is very useful and helps set expectations for core and inlet size. If you have room I would start with a 25-30% duct opening and reduce if possible during flight testing. Once you have a performance baseline it’s much easier to reduce the opening then enlarge it. Or use a cowl flap. Ed’s workbook estimates BTU rejection for the core face so I assume it’s for the first cubic inch. My 2.75” cores with an 82F delta T preform about 35% better than the workbook prediction. Bobby Sent from my iPad
On Sep 8, 2019, at 12:59 AM, Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote:
I think the "Scirocco" style refers to no filler cap.
There are a lot of "Scirocco" rads at fairly low prices, but they appear to be thin; nowhere near the 500 cu inch we're looking for. Also, most of the racing radiators have 1.25 to 1.75" inlets/outlets. I wonder how you found yours with 1.1" inlets/outlets. ( https://www.ebay.com/itm/290600743649?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 )
But would like to know what Dennis uses.
Finn
On 9/6/2019 10:30 PM, Charlie England ceengland7@gmail.com wrote:
On 9/6/2019 8:16 PM, Finn Lassen finn.lassen@verizon.net wrote:
Not sure why I was so stuck on only putting evap cores in the cowl cheeks.
Evap cores are cheaply available.
I'm thinking they could easily be stacked under the engine as well. (Not making then 8" thick, but flat end to flat end, or tank-to-tank).
One way would be to join them flat end to flat end with an o-ring. That would put them in series. 13" wide and 18" long.
The other way would be tank against tank, which would enable parallel (but more hoses). 9" wide and 26" long.
I don't remember earlier postings on this, but would 3/4" ID hoses be enough for a series configuration? (200 max HP Renesis, more likely 180 HP)
Finn
Tank to tank makes an efficient diffuser difficult.
There are cheaper versions of the Scirocco rad with 2" thick cores, if you think that would be enough core volume. Dennis H. is using a Scirocco for his Renesis; perhaps he'll see this thread & tell you his core thickness.
Charlie
Charlie
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