- Wed Oct 30, 2013 4:56 pm
#337286
Last flight with my mosquito ended quite abruptly: after 10mn, the motor stopped running, after some strange noise and vibrations.
Back at home, the first thing that I noticed, was a missing screw on the air box bracket (the one that connect to the cylinder cover).
The screw was still inside the air box...but when I opened the motor, I found half a washer inside the crankshaft chamber, and lots of iron chips. Bummer.
So now I wait for a new piston and a new cylinder. Hopefully nothing else has been damaged in the process.
The fact is, before the flight, at home, I had time to check all screws and made sure every of them were tight enough. I just found that "this" one was
somehow not any more fixed to the air box body, so was turning when I tried to tighten it.
Anyway, I was confident, because the Nyloc nut was correctly screwed on it.
I was wrong, mainly because this screw was too short.
So it loosen while in the air, the screw fell inside, and the washer was suck into the carburettor all the way to the motor chamber.
If I think of a solution, it would be to have a bigger screw, on which you could have an additional nut between air box and bracket. Just now, I have to
figure out, how to place this screw back into its hole.
The positive side is, now I know exactly how is assembled my motor, and it is way simpler than I thought.
Back at home, the first thing that I noticed, was a missing screw on the air box bracket (the one that connect to the cylinder cover).
The screw was still inside the air box...but when I opened the motor, I found half a washer inside the crankshaft chamber, and lots of iron chips. Bummer.
So now I wait for a new piston and a new cylinder. Hopefully nothing else has been damaged in the process.
The fact is, before the flight, at home, I had time to check all screws and made sure every of them were tight enough. I just found that "this" one was
somehow not any more fixed to the air box body, so was turning when I tried to tighten it.
Anyway, I was confident, because the Nyloc nut was correctly screwed on it.
I was wrong, mainly because this screw was too short.
So it loosen while in the air, the screw fell inside, and the washer was suck into the carburettor all the way to the motor chamber.
If I think of a solution, it would be to have a bigger screw, on which you could have an additional nut between air box and bracket. Just now, I have to
figure out, how to place this screw back into its hole.
The positive side is, now I know exactly how is assembled my motor, and it is way simpler than I thought.
Attachments
the damage.bmp (764.91 KiB) Viewed 3655 times
the washer.bmp (646.37 KiB) Viewed 3655 times
missing screw.bmp (776.82 KiB) Viewed 3655 times
Sphinx La Mouette, Boomerang XM 147 tecma, new old Speed UP, Vertigo Seedwings and a Mosquito harness for those no wind days!
No matter what you do, but do it with style!
No matter what you do, but do it with style!