Why Do I Need a V-Tail Mixer? Previously I have flown an RC glider (that was more or less a barn find) with an old Graupner remote control that is probably from the 70s or 80s. After its death1 I w...

Disclaimer: the following text is mostly based on Müller W. Herbert (1988) “Die Umlaufgetriebe: Auslegung und vielseitige Anwendungen”. This is of course in German, but there appears to be an Engl...

In a future post that is a bist of an addition to my astro gearbox post, i am planning to provide some information on gearboxes for very high transmission ratios. Because it became quite long, i am...

Someone on the cloudy nights forum found out hat you can use a teleconverter as a binocular with low magnification but high field of view. Due to a larger aperture, more stars can be seen on the ni...

In other news, i am sometimes also doing experimental photography. My newest exploits are cyanotypes of some of the beautiful flows collected in van Dykes An Album of Fluid Motion. The pictures we...

After completing a design, it is important to be able to measure whether the expected performance has been met and if not, where improvements have to be made. In my case, i had to measure whether a...

To make the telescope mount presented in this post actually useful, it has to be motorized with at least a polar axis. For this i intend to use the open source OnStep controller. On the mechanical ...

This is my design for an equatorial mount. It doesn’t need many specialized tools, apart from a jigsaw, a drill press or a drill stand and Forstner drill bits. For parts, the most distinct are the...