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The wheels of an airplane. Sometimes replaced by floats or skis.
6
votes
Why should an overheated wheel be approached from the front/back and not in line with the axle?
The weakest part of tire's structure is the sidewall, unless the wheel has been locked and the tire tread is severely worn out. If a tire is blown simply due to overheating, it most likely will eject …
2
votes
Why are aircraft tires not pre-spun prior to landing to preserve them?
A good summary of factors in this concept is SAE AIR5800 report. It lists the pros and cons as follows, citing several SAE and NASA documents, and Boeing NACA and AIAA papers:
Advantages:
Reduces tir …
7
votes
Why are/were there almost no tricycle-gear biplanes?
As you suspected, this in an evolutionary coincidence. As construction methods and materials improved, multiple stacked wings became obsolete being less efficient to otherwise comparable single wing d …
66
votes
Accepted
What operation is this aircraft performing?
The flight in question is most probably an evaluation/calibration flight for radio navigation systems at Ust-Kut. The aircraft is a Yak-40 special version designated for such tasks:
Aviamuseum - Yak-4 …
1
vote
Why does the hydraulic pump of retractable-gear GA aircraft run continuously throughout the ...
As user3528438 pointed out, the reservoir seldom has enough capacity to run the systems it is feeding. It's purpose is more like being a dampener, as the pump would otherwise produce quite spikey pres …
31
votes
Accepted
What causes a Cessna 172 and its gear to shake violently after landing and braking?
I'm pretty sure you have encountered "nose wheel shimmy".
For reference, see this video on Youtube: c172 M Nose wheel shimmy [sic].
The shimmy can occur for a variety of reason, most likely due to som …
3
votes
Why landing gears still need bungee springs?
The purpose of the (bungee) cord was correctly explained by CatchAsCatchCan... however
If the question is about the springs, their purpose is to help pull and lock the drag strut into it's down positi …