Archiv rubriky: Posts in English

Propeller Efficiency

This text is a result of my discussion on propellers with Mr Spencer Greenhalgh from whom a have learnt a lot. Note: This text contains mathematical formulas and derivations. However, these could be easily skipped without considerable loss of the … Celý příspěvek

Rubriky: Posts in English, Teorie | 1 komentář

Crumble – 15.10.2010

26 flights in Autonomy, few afterthoughts from WC F3J by Sydney Lennsen, latest development on the F5J/FXJ battlefield. Is it really better to have smooth and accurate wings, and how about walkalong e-glider?

Rubriky: Názory, Posts in English, Teorie | Napsat komentář

Battery and Temperature

It is known that a Li-pol battery performance depends strongly on the temperature. However, the hard data are scarce – so here is my contribution.

Rubriky: Posts in English, Teorie | Napsat komentář

Electric Sailplane Efficiency

An electric motor is pulling some amount of energy from the battery. The model climbs at speed which is much less than it would correspond to this battery power. About 2/3 of the energy dissipates on the way. Where it … Celý příspěvek

Rubriky: Posts in English, Teorie | Napsat komentář

About Autonomy contest

The Autonomy originates in and is flown in Italy (please see www.autonomy-f5j.it). The rules are simple: make as many 6 minutes flights as possible with the allocated amount of energy.

Rubriky: Posts in English, RCEE/Autonomy | Napsat komentář