Spring 2019

Work continues on modifying the original Jefferson Jyrodyne design to take advantage of recent electric motor developments.  A far larger CL and CG range will now be allowable than was theoretically possible before, and has an extra dimensional consideration, since both CL and CG can now more easily move in two dimensions, rather than just one.

Ambulance Modifications

All previous designs were for passenger and cargo and the configuration was optimized for that purpose. Special designs are top secret, and won’t be mentioned here, but veterans who I converse with will find out their thoughts are listened to.

The stretcher supports affect the configuration, and have a big effect on weight and balance performance. Thus, aerodynamic analysis of new configurations can get complex and lead to multiple unanticipated crashes.  Work progresses on ¼ to 1/10th scale RC models.

Since a lot of equipment is typically carried in a conventional ambulance, two models are required: 1) stretcher model, for frontline usage; 2) triage model, mobile hospital.

Fire Trucks

These are water bombers that can take off and land vertically, but do much better as STOL units, with a range of sizes developed to optimize firefighting. Minimum gallons per aircraft vary from one 55 gallon drum to 1000 gallons. Some of these are pretty big aircraft.


Helicopters elicit complaints due to the noise level caused by exposed flapping wingtips. This may turn out to be a societal problem if not addressed carefully. Early cars had very poor mufflers.

Ducted fans convert propeller tip losses and the resulting noise into useful  thrust. At the same time, the use of sound deadening materials like rubber and other flexible plastics in the ducted fan bellmouth can further reduce the perceived noise level. Urethanes and Kevlar are of particular interest in multilayer castings.