Recently, I discovered some small counter-rotating propellers that I didn't know before. I ordered some and did some tests. The red 4x4.5" props look really good, nice thin airfoils and a good precision. During the tests, they made the least amount of noise, and are currently my preferred ones. The performance of the 4x2.5" props is even better, but they have a pretty terrible sound and seem to be less balanced. Both propellers outperform the AirAce propellers, but this is not really a surprise because the AirAce have a smaller diameter and more blades. What is also interesting is the weight of the propellers. A propeller with a lower weight potentially has a lower moment of inertia which is beneficial for the control loops: AirAce: 2.1 g 4x2.5": 1.5 g 4x4.5" : 1.3 g So this is an advantage for the 4x4.5" propellers, especially because the weight of this propeller is more concentrated to the center, which should further lower the momentof inertia. ...
Looks excellent - I have bought the parts and will be building during the Christmas Holiday. I will let you know how I get on.
ReplyDeleteI would like to use an ATMega32 that I have already - if I change the def file name is the software likely to compile and work ok?
regards Peter
Hi Peter,
ReplyDeleteyou can most likely use an Atmega32, but I would nevertheless recommend an arduino mini pro. It's cheap, small, light and handy. I assume that you know how to change the circuit and that you have Bascom + an ISP programmer? Because otherwise it will be complicated for you if I release new firmware.
So my recommendation is: Pay some 14 Euros extra and get an Arduino.
Thanks William.
ReplyDeleteI have built a number of projects using processors from an ATMega16 to a 644P and BASCOM so I would not have any probelms (I hope) replacing the Arduino with a processor, crystal, etc. and programming using the ISP port.
regards Peter
dalla svizzera LUGANO
ReplyDeleteGrazie william per il set-up manual lo aspettavo con inpazienza molto ben descritto
la costruzione del cubbo.
ciao e scusa per litaliano.