ORIGINAL: David Gladwin
Really guys its unbelievably simple. Our models are TOTALLY dependant on a secure power supply. Without it they are DEAD, period. We CAN so easily gurantee that power supply by fitting TWO batteries, at minimal cost in cash and weight. A big hole plugged, dead easy and cheap in the big picture . Risk of battery failure is X, with TWO batteries its X squared , virtually eliminated . Why do you guys think that two of everything (sometimes three, but they still have just ONE main spar !) are fitted to things like ETOPS airliners, why does my boat have 2 batteries ? Why does my car (all modern cars) have THREE brake systems, my aeroplane (when I had it) 2 ignition systems ?
May I suggest you read the manuals of the Weatronics DRs and the Powerbox systems if my logic about power supplies is dismissed. The designers of these system are no fools, far from it.
Sorry, Ali, my big models do have TWO receivers ( Weatronic) and TWO power supplies. I CANT guarantee totally systems redundancy as even with twin servos on a single surface a burned out servo will make that surface immovable. Even my small models will soon have Weatronic Dual receivers (micros) on 2.4
However, there are situations where total redundancy IS possible and the critical situation of vital power supplies is just such. Not filling THAT gap is, in my opinion, just dumb !
Just my opinion, of course, but based on 40 years of R/c modelling (back to RCS Guidance systems and Flight Link Proportional) and 40 plus years of operating real jets, but what would Boeing etc. know ?
Funny thing is that I have bought hundreds of servos over the years, with perhaps two failures, I have a whole box full of batteries that have deteriorated to the point of being unuseable as main power supply. Go figure, as our American friends would say !
Regards,
David.
PS and yes large models DO place a larger demand on electrical supplies. Large digital servos moving large surfaces against higher dynamic loads equals greater current draw, elementary physics !!
David,
You can say things without being so condesinding. as the AMERICANS WOULD SAY I have had various powerbox/smartfly power systems burn out due to a pinched servo wire. It did not matter how many batteries were hooked up I was dead in the water. or should I say sky
However I do agree more is better I have had many jets with 1 batteries for surfaces 1 for ECU Hell most composit bandit arfs are like that. I do not think there is a shortage of those. I always love the throughn in I am a pilot or engineer like it really matters. Hell I have been driving cars for 27 years does that make me a expert No Nor will it make me a better RC car Driver. See the point so leave the profession out no one cares. Crashes are going to occure no matter what, lets just hope that we all can help each other to minimize the damage and hold a high level of safty. Not scold one another about what should have been done and what are qualifications are for saying it. Never showing the problem does not help anyone. By the way David My experience is based on 2 years of modeling experience. I know guys with 40 years experience that are yet to get a Jet off the ground there just not that good ( So leave your experience out as well) Some people are natural tallent some take 40 years to get it! I would say AlI is in the natural tallent colum and I am very confident that he did not put a unsafe jet up in the sky. Very simple
equipment failer.
Ronald R Long