Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Helpful to know the acrylic used on the bottom plate of the Solar models is designed for lower temp tolerance.
Finally, will yours run from sunshine thru window glass ? Also, I assume it will run from an overhead infrared heat source, and not just sunlight

I've not tried running it in the windowsil but i don't see why it wouldn't work indoors through glass, i know it can run under the glass dome in the sunshine. Not sure about infrared or a strong artificial light as i've never tried it.

OH, and do the KS90 Solars normally run by heat on top plate and cooler temp on bottoms ?

Yes that is correct, it threw me the first time as i realised i had to flick the flywheel the opposite way for it to work.