Topic: 262

Our biggest job yet Alis 262 ,
it arrived last week for Ian who has doe a great job on the rebuild and paint job what strikes you first is the size of it
very big and takes up most of our unit,
our job was to  gut it and fit new Turbines  and rewire the whole model plus new fuel system ,
Every servo was double wired so that had to go so did all the leads and battery's,
After a week of soldering and 15 meters of wire new servos we are almost there and maybe ready for Weston park

Cool.... That looks huge in there!

What do you mean by double wired?

Every servo in the 262 had been took apart and had two leads why i don't know so you can imagine how many leads there was, but not any more all gone.

Every servo in the 262 had been took apart and had two leads why i don't know so you can imagine how many leads there was, but not any more all gone.

Redundancy - if it's done properly you still have your 2 Rx, but  both are feeding every servo

just post the old ones to me and I'll dispose of them....

Alis 262 ready to fly , Any one know were the C/G should be has it a swept wing not sure were it should be

Treat it like a simple swept tapered wing, ignore the crank in the trailing edge. A line up the trailing edge from the tip to the root will give you a dimension for the root chord to type into one of the many online CofG calculators. You'll need to know the sweepback too. Easiest way to get this is to assemble the wing, then put a string from tip trailing edge to the other tip trailing edge, then measure at the root from string to the 'imaginary' rear chord line  I just mentioned. If you send me the measurements I'll work it out.

Ian.

Heres one from a quick search

http://adamone.rchomepage.com/cg_calc.htm

Simply type in the numbers and voila. I've never used one of these sites so it would be best to use a few different to see if the figures tally.

Ian.

From the same site, this one gives it for a 262 type wing planform, though as I said earlier, a simple taper would work fine since this wing doesn't change much.

http://adamone.rchomepage.com/cg2_calc.htm

Redundancy - if it's done properly you still have your 2 Rx, but  both are feeding every servo

Could you do that with a Y lead ? 2 rx's into one servo lead ?

Chris

Redundancy - if it's done properly you still have your 2 Rx, but  both are feeding every servo

How does that work then?  Two digital outputs  wire OR'd together.   Of course, ideally both outputs would change state at exactly the same time and at exactly the same rate but we live in the real world and each output would be driving the other for a fraction of the time twice for every pulse which would, I would have thought, tend to lead to an earlier failure of one or both rather than providing greater reliability.   

Not the way to do redundancy in my book and anyway, at the end of the day (or even the wire) you've got a single point failure waiting to happen i.e. the servo.   Coupled with the fact that the servos have been disassembled and reworked with a, hopefully, hot soldering iron by someone not necessarily best equipped to make good joints.

Good job it's all been stripped out and replaced I would have thought.

It's looking fantastic BTW

Two penneth supplied.

Alan

 

How does that work then?  Two digital outputs  wire OR'd together.   Of course, ideally both outputs would change state at exactly the same time and at exactly the same rate but we live in the real world and each output would be driving the other for a fraction of the time twice for every pulse which would, I would have thought, tend to lead to an earlier failure of one or both rather than providing greater reliability.   

Not the way to do redundancy in my book and anyway, at the end of the day (or even the wire) you've got a single point failure waiting to happen i.e. the servo.   Coupled with the fact that the servos have been disassembled and reworked with a, hopefully, hot soldering iron by someone not necessarily best equipped to make good joints.

Good job it's all been stripped out and replaced I would have thought.

It's looking fantastic BTW

Two penneth supplied.

Alan

Trust me they were installed by a far more qualified person than you or I! Also don't forget the designer and original builder wrote the book on redundancy and the over 20kg scheme so I also would not worry about that.

She looks fantastic btw. Look forward to seeing Ali flying her.

Steve