BTW here is a quick and simple pusher cooling system.
The rad is part of the scoop, the diffuser duct and the exit duct
all in one. It is spaced down from the fuse with a splitter plate to
bypass the boundary layer. Works great! Very flexible and
can be used with a wide range of rads.

Chad Robinson wrote:

OK, I got confused with all the talk about other air collection methods, and
forgot this one. This is how I plan to set my pusher up. A few questions:

1. Will the natural convection allowed by this system be sufficient for ground
cooling, or will it be necessary to keep idle times low? Since there's no fan
to augment the flow (== drag while flying), it looks like convection might
cause problems while earthside (which includes the entire time I'll be testing
things before my first flight, including some multi-hour runs to see how it
performs once it's heat-saturated). For ground testing I can use a box fan,
but should I also consider one or more biscuit fans?

It wouldn't be too tough to have a drop-down panel with fans in it that
augments the flow only while on the ground. But it's an extra subsystem I'd
prefer to do without.

2. My real question. Should I still install the NACA scoop for OTHER purposes,
such as supplying intake air to the engine, or cabin cooling?

Thanks,
Chad

You will have to keep idle times short unless you add an electric fan
or a water dribble system. Tracy Crook used a water dribble system
when he 
needed to taxi all over OSH in the middle of a 110 F summer. As I
recall he also
had a dribble system in the Sun 100 race last year. Not sure if he
needed
or used it however.

Paul Lamar
 
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