Stunt vehicle ?
I forget the technical term, heat pump ?, but use a heat exchange
enclosure/plate for servo, thermally insulate except for:
pipe allows gravity feed of condensate liquid from cooler region,
evaporates on contact with servo heat exchanger, rises in vapour phase
to cooler section...
Thermally insulate pipe also, try looking up "heat pump" to get an idea
of implementation.
May also be more effective if sealed when vapour phase excludes air.
Use a low boiling point non-flamable liquid. (or alcohol for an
exploding stunt vehicle.)
regards,
Graham.

> Jon Petty wrote:
> >
> > Hello
> >
> > Does anyone know if there are high temp rc type servos. I am using an
> > Airtronics heavy duty servo in a motor vehicle application that is mounted
> > under the hood. The servos are mounted in an aluminum enclosure, but they ar
e
> > subject to the underhood heat from the radiator, engine and exhaust. The
> > servos have been doing all right, but the recent ambient 110 deg F. temps in
> > Phoenix have increased servo exposure to temperatures well above 250 degrees
> > F and they have started failing.
> >
> > Any ideas or suggestions?
> >
> > Thanks
> >
> > Jon

--
Steam engines may be out of fashion, but when you consider that an
internal combustion engine would require recovery of waste heat by
transfer just before top dead centre then fashion becomes rather
redundant, USE STRATIFIED HEAT EXCHANGERS ! and external combustion.

You heard it first from: Graham Daniel, managing director of Electronic
Product Enhancements.
Phone NZ 04 387 4347, Fax NZ 04 3874348, Cellular NZ 021 954 196.