Hi guys
A while ago a pic of the cooling plenum chamber I made for a revmaster was
circulated on KRnet. At the moment I am working on another cooling chamber
for another revmaster motor, except this one is turbo charged, intercooled
and is equipped with fuel injection. It has an induction system that crosses
over the top of the motor which has made building the plug somewhat of a
challenge but I finally have it built.
Today while building the inlet tube plugs that join the cowling inlets to
the chamber inlets, I considdered doing what Mark L did with his inlets ie
making the tubes bigger than the inlets in the cowl so that they fit over
the cowl's inlet lips. After thinking it through I decided to go with rubber
seals because I think that the air rushing into the cowling inlets past the
edge of the cowling inlet lips would cause a venturi effect and suck with it
air from inside the cowling via the gap between the duct and the cowl inlets
thereby recirculating air that had already been through the cooling system
and heated. This would not be too critical in a low speed aircraft like the
motorgliders I build but in a ahigh performance ircraft like a KR I would
imagine the venturi effect would be exponentially higher??
Mark, I know that your cooling system obviously works well but don't you
think that you could make it even better (more efficient), achieving even
lower CHT's by sealing that gap?
Regards
Dene Collett
Avlec Projects
Port Elizabeth
South Africa
