Martin Whybrow
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Posts posted by Martin Whybrow
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I consider the XTs to be one of the best battery connectors for the purpose and certainly don't consider them unsafe.
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Possibly the most honest thing I've seen in a listing: "I don't know what I'm talking about with it"
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Posted by Adrian Smith 1 on 28/10/2017 08:44:55:
Browsing the t'internet the other day, as you do, I came across this online supplier. **LINK**
If you Google their registered address, you may think twice about buying from them
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Send me a message with your email address and I'll send it to you.
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The wings look very much like the Greensleve wings; the Greensleeve has a conventional (low horizontal stabiliser) tailplane; the wingspan is 2m and is electric powered with a motor in the nose. The wings are 2 pieces, joined with a steel bar; the wings mount via 2 dowels at the front and 2 M6 nylon bolts at the rear.
The Cortina has the same fuselage, but has an all moving T tail, 3 part wings with no aeilerons and a span of 2.2m.
I have both plus two more unidentified models with the same fuselage! I also have the instructions for the Greensleve.
Edited By Martin Whybrow on 25/10/2017 21:01:21
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Glad that Essex police know the law, their neighbouring force, to the north and west, doesn't appear to have a clue from my experience with them.
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Pete, do you mean BCF or powder? BCF is a halon, so disposal is very different.
The powder is relatively harmless as it's either ammonium phosphate, which is a fertiliser, or potassium or sodium bicarbonate. If it's the type with a gauge, it's a stored pressure extinguisher so needs to be fired to make it safe; if there's no gauge, it will be a cartridge type which can be opened easily (the head assembly screws off), these usually have a wider neck and will have no sign of a gas fill valve. With the cartridge type, you could tip out the powder into the bin, reassemble the extinguisher and fire it in safety.
Halon is a very tricky substance to deal with owing to ozone depleting chemical regulations.
Alternatively, let the local fire brigade set it off for you!
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Posted by Paul Marsh on 01/10/2017 20:32:09:
It's not the Rolls-Royce Trent engine this time, but a General Electric/Pratt and Whitney engine,but same non-contained failure as the Qantas Flight 32.
Edited By Paul Marsh on 01/10/2017 20:36:05
QF32 suffered a turbine disc failure on the Trent 900, this was a fan / shaft failure; agree that both were uncontained failures though.
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The engine sounded very much like it lost one cylinder, was the object that came flying out a spark plug?
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You're right, that boot IS much bigger than it looks from the outside!
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Not so much from my house, although it would have been very close, but was out gliding today from Cambridge Gliding Club (1st time I've tried gliding), I spotted a fighter aircraft ahead which then turned and passed directly over us a few hundred feet above us, we got a very close up view of a Sea Fury, fantastic!
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Posted by Geoff Sleath on 17/09/2017 00:33:23:You're absolutely right, Martin except capacitors don't store voltage, they store energy and the energy (Q) in joules = voltage x capacitance (in Farads!). Obviously you can juggle the formula around to give the voltage.
Geoff
I'm going to be a real pedant here! Capacitors don't store energy, they store charge, Q is a measure of charge, not energy and it's measured in Coulombs.
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Posted by Denis Watkins on 16/09/2017 23:20:12:
Its voltage too guys, as a cap never runs at 100% capacity,
They discharge at a very high rate at 2/3rds the voltage.
So the 50v caps I see in the pics will discharge at 30v, hmmm ?
Choosing a cap is like choosing an ESC, in that we choose one near and above our operating voltage.
Caps come in various guises, and ours would be the 8v or 16v
And would do their work between 6 and 10 volts.
On reaching their case claimed voltage range, they immediately discharge and are ready again to fill.
This is how they smooth circuits
I'm not sure where you go this information Denis, but it's far from correct.
The voltage rating of a cap is the maximum voltage it's guaranteed to withstand before the dielectric breaks down; when selecting a cap, choose one that exceeds the maximum working voltage, e.g. for a 3S pack, use a 16V or higher rated cap. You could use a 250V rated capacitor, it would work but it would be much larger than the 16V cap and would cost a lot more as well.
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Posted by Geoff Sleath on 16/09/2017 22:28:13:
The only problem is that the capacitors you're adding look like aluminium electrolytic which can have quite a high inductance themselves if the aluminium plates are wound round the electrolyte as they often are. That means their ability to absorb high frequency spikes is limited. A better type of electrolytic is a solid tantalum, which is more expensive, but they have much lower inductance
Tantalum caps are very unreliable and best avoided where possible as they have a tendency to go short circuit. Much better is to look at the ESR and select an electrolytic cap with a low ESR value.
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Had my first hands-on in a Cessna 182 about 25 years ago, then a Piper PA28 about 4 years ago; also had an hour in a 737-800 simulator a couple of years ago, a very worthwhile experience if you get the chance (if you're anywhere near Cambridge and fancy a try, I can put you in contact with the operator of the sim). On Monday, I have an entire day of glider training at Cambridge Gliding Centre, courtesy of my brother (my 50th birthday gift from him, he knows me well!)
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How about a D connector, they're pretty substantial but reasonably compact.
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Obviously those recommending Appliances Online haven't had to deal with them when trying to get something repaired!
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A colleague who's in the know mentioned it was picked up during an examination of the magnetic plug in the oil system.
It's a shame thay didn't find it earlier, the Lanc was supposed to do a display at our loacl show at Little Gransden last Sunday!
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Sally B was flying today (Sunday), she did her routine at Little Gransden show (Cambs)
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One of the news sites indicates this affects all Merlin engine aircraft! I haven't been able to find anywhere that details what the problem is so far.
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Another one who mounts the switch internally and uses a pushrod to operate it; I use the SLEC kit for this as it gives a neat bush for the fuselage side and a plastic knob for the actuating rod.
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Posted by Charles Smitheman on 11/08/2017 15:34:36:
Thanks for that link. So the bucket of water is a good idea after all.
I'm sure somebody mentioned that yesterday
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The way airlines deal with Lithium ion battery (valid for LiPos as well) fires is to drop them in a metal bucket and pour water on them; you need to cool the battery down below the point where it's breaking down. You will hear people telling you not to put water on a metal fire - they're correct, but there's no lithium metal in a lithium ion battery so it's OK to use water.
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I'm jealous! That's a lovely flying site in a beautiful location.
Clearview - take care
in Simulators
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A lot of antivirus packages work on signature for executable files; if they're not in the database, or the signature doesn't match, the program is treated as malevolent and the AV deletes files; I have a recurring issue with one bit of software that my AV keeps deleting, despite it being 100% safe!
The issue with Kaspersky AV is that it's Russian and the US government has apparently detected that as well as sending suspicious files back home for analysis, it may also be detecting keywords in files and sending those home too (it's been suggested that words and phrases such as top secret or classified might trigger this behaviour).