I have a post in the RCV engine area , but thought I would put this up here to get a larger feedback . I'm putting a RCV 120 sp into my Nieuport 28 that I'm building . I'm building a scale looking dummy engine for the cowl and it shrowds the engine a lot .I've done a lot of reading about ducting cooling air over a engine , what works and what doesn't . But , I really don't know how much air needs to flow thru the fins to keep an engine cool . I have an idea to use a fan from a computer and a fiberglass duct work to blow air thru the fins . Last night I got to thinking maybe it would be a better idea to use the fan to pull air thru the ducting instead of trying to force it thru . Does anyone have any thoughts on this that might be helpful ?

Guy.

pull the air through using a small ducted fan unit. Computer fans are clumsy and lacking in air pressure difference. They only move air, but cannot force air flow.

Why not simply baffle the engine so that the air that comes around the dummy engine is forced from top to bottom and out?  I would only take a bit of plywood, balsa, and perhaps some plastic or fabric to make the baffles.  You should have plenty of air without a fan.  Glow engines just don't generate enough heat to get that fancy.</p>

This is the way to do it!

What Sport Pilot said in post #3. Be sure there is plenty of opening for the air to exit.

jess

Thanks for your thoughts guys . RCV sp engines being what they are and the dummy engine being how it is makes me lean towards a fan . The ducted fan idea sounds like a better idea than a computer fan .

Guy.

Most posters seem to forget that this is about an RCV engine. They have a reputation of running VERY hot in their confined packaging space.