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
>
> I think the "Scirocco" style refers to no filler cap.
>
>
> But would like to know what Dennis uses.
>
> Finn
>
>>> 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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