Since RCV SP engines have a tendency to overheat, probably due to the cooling fins being perpendicular to the airflow, why couldn't RCV redesign the cylinder casing to have the cooling fins parallel to the airflow? That way, no special baffles are needed to cool the engine.

Hi Richard

Thanks for your post.
With regard to the cooling fins, all RCV SP series are cnc machined from solid (rather than diecast like conventional 4-strokes), and this machining process means it is not feasible to change the cooling fins. If we went to a die cast design we would consider changing the fin orientation, however research into this suggests the results would not be significant, as the current configuration potentially increases cooling due to turbulence.

Secondly RCV SP engines don't really have a tendency to overheat any more than other 4-strokes. Instead, because of their streamline shape they can be too tightly cowled without enough air flow over the engine (both air in and air out). As long as basic cowling rules are followed they shouldn't be any overheating problems. Rules include allowing at least 1" air inlet with 3" air outlet. If tightly cowled arrange a scoop within the cowl to direct airflow over the engine.

Best regards
Laurenne

Hi again Richard

I have just had a look at your website, you have some absolutely fantastic models - I'm very impressed.

I thought you might be interested in our CD range too, as these get cooled in the standard fashion. The main advantage of these over conventional engines is their height, so they are much easier to cowl than conventional 4-strokes. The RCV91CD for example is the same height as .52 size 4-stroke. A couple of warbird kit manufacturers are now using the RCV91CD engines as standard for much of their prototype testing with great results. Check out the videos on our website [link=http://www.rcvengines.com/gallery/rcv_gallery_video.htm]www.rcvengines.com/gallery/rcv_gallery_video.htm[/link]

Anyway I've bookmarked your website and will pass it on to the guys in our workshop.

Best regards
Laurenne

Laurenne,

Thanks for the replies. I will keep your CD range in mind. The guys over at YT International in the UK are using the 91CD in their latest warbirds with success.