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"Fitting is the reversal of removal" Numerous Haynes car manuals usually right after explaining a complex procedure like an engine removal and strip down.
"And the Lord spake, saying, "First shalt thou take out the Holy Pin. Then shalt thou count to three, no more, no less. Three shall be the number thou shalt count, and the number of the counting shall be three. Four shalt thou not count, neither count thou two, excepting that thou then proceed to three. Five is right out. Once the number three, being the third number, be reached, then lobbest thou thy Holy Hand Grenade of Antioch towards thy foe, who, being naughty in my sight, shall snuff it.", Armaments, chapter two, verses nine through twenty-one. - Monty Python and the Holy Grail (On deploying the Holy Hand Grenade Of Antioch)
'The only time you have too much fuel is when you're on fire.' - Unknown Author
That may true in military aircraft, but that is definitely not true in civilian aircraft.
I was flying a particular low wing aircraft that I rarely flew and stopped for fuel at an airport. The line guy asked if I wanted the tanks filled "to the tabs" and I replied, "No, full please." In many smaller civilian aircraft the engine doesn't have enough power to take off with both full fuel tanks and passengers in all the seats or with a lot of baggage. So the aircraft manufacturer installs tabs in the fuel tanks that are visible when fueling. When the fuel tanks are filled to the these tabs, that generally means the aircraft will have enough power to take off with passengers in all the seats and little or no baggage. In this case, I had one seat empty, the passengers all weighed significantly less than the standard weight used for passengers when calculating whether the engine has enough power to take off with passengers in all the seats and full fuel, and no baggage, so I told the line guy to fill the tanks full.
When the aircraft had been fueled, I paid the fuel bill, and I was ready to go again, I got permission to taxi to the runway and was immediately given permission to take off. The runway was paved, a length commonly found at smaller airports, the airport was less than 1,000 feet above sea level, and it was a cool day, so there was no need to configure the aircraft for what is known as a "short field" takeoff. A short field take off gets the aircraft off the runway using as little runway as possible and the pilot flies at a specific speed so the aircraft climbs at the steepest safe angle possible to clear any obstacles that might be at the end of the runway. I configured the aircraft for a normal take off and opened the throttle. The aircraft started down the runway but it seemed to take a little longer than usual to get up to flying speed and when it did I lifted off the runway. The aircraft was climbing rather slowly and the trees at the end of the runway were getting larger and larger in the windshield instead of disappearing out of sight below the nose of the aircraft like they normally do. It was at that point that I realized that something was wrong. A quick check of all the gauges indicated the engine was developing full power and I was flying at the proper speed to climb at the best angle possible. I needed to climb more quickly or there was a good possibility we would end up in the trees. The only thing left to do was to configure the aircraft for a short field take off. Once in the air, if one is flying at the proper speed, the only thing left to do is to change the flap setting to the short field setting and hope the additional lift would get us over the trees. I moved the flaps from the normal takeoff setting to the short field setting and we cleared the trees with a lot less altitude that I would have liked.
Once we got up to a safe altitude and headed towards our destination, I started trying to figure out why I had such a hard time clearing the trees at the end of the runway. I had one empty seat, light passengers, and no baggage. What was the problem? Then it hit me; this particular aircraft had air conditioning installed. The weight of the A/C unit, the motor and stuff needed to lower the unit into the operating position, etc., had added several hundred pounds of weight to the aircraft. I had failed to take this into consideration when determining how much fuel to put in the aircraft at the fuel stop.
So yes, you CAN have too much fuel and NOT be on fire.
Issue 20 of the excellent online FREE Raspi mag, "The MagPi" is now available.
For those who haven't heard of this, it is a great magazine with good article on beginner to advanced topics. Did I say it was Free? You can view it online or download it as PDF to consume at your own leisure offline.
After going round to pal from works house yesterday to see what tools he had to potentially remove my locking wheel nut that is mashed and subsequently giving up, I headed to the shops this morning to get some new drill bits and extractors etc.
Couldn't find any high cobalt bits or tungsten carbide so had to settle for titanium coated.
After what was hours of hunched over drilling a progressively larger hole in the knackered wheel nut (which is unfeasibly hardened, even a centre punch barely made an impression), I eventually got a decent size. I tried hammering in a hex/torx socket, and it did get a really good hold, but there was so much torque it started turning the bit inside its parent socket.
Next thing to try was the coarse thread extractor, after various attempts eventually got a really good bite on the wheel nut. Slowly increasing the force through the breaker bar, whilst still trying to keep it square the damn extractor shattered and yes it is jammed in the hole
I'm going to try and clear the hole tomorrow and then leave it till I get back from offshore in a couple of weeks then either order up some fancy bits and some hex-spline sockets (haven't found any in the UK yet only on Ebay from the US) etc.
If that doesn't work, then it will be trying to weld a nut on or just book it into a garage and let them do their damndest.
On top of that, I have a pile of 3 about 4 shipping blankets on top of the stored winter wheels, went to take one of them to kneel on, and found it was full of peanuts. Also, some of the others were also full of peanuts and really chewed up. Looks like a mouse had set up home and was stockpiling peanuts from the bag of bird/squirrel nuts I have in the garage. It would also explain why when I went to the bag at the weekend and lifted it up, it start spilling nuts on the floor. I thought I had just torn the bag with some timber that was against it.
Wish I could roll back to 24th December when I think the first damage to the wheel nut occurred and things might have been different now.
It is a MB C63, the locking nuts are recessed into the alloy (by about 1.5inch), are flat faced with a groove cut in them and also have a spinning ring round the edge. There is next to 0 space between them and the recess wall.
I think that the bolts were originally over torqued or have seized over time. Then when I tried to release them using a standard MB tyre iron, it slipped and dogged the nut. Had I used a proper breaker bar I probably would have been OK.
I'm not familiar with the vehicle, Dave, but is it possible to get to the backside of the studs? On US cars and all Asian vehicles I've seen, the studs are pressed into the axle plate. If there's any thread left, it's SOP to use a nut and puller, but in extreme cases, the studs can be driven out from behind. You'll probably have to drill out the part that engages the nut from the front in order to get the wheel off and expose the axle plate, but from there it should be reasonably easy to replace the studs.
Alternatively, you could drag it somewhere distant from your house, set fire to it, and file a stolen vehicle claim with the insurance company.
Easyouts seldome work, they often break leaving the very hard metal that it is made of behind. Which is wosre.
Weld something to it. A big nut often works well, if not a bolt. At the very least the heat will denature the steel rendering it drillable, and will break the bond with the hub making it easier to get off.
Of course you could just take off the upright and brake pipe and get another one from a breakers yard.
Last Visit: 31-Dec-99 19:00 Last Update: 3-Dec-16 16:53