Max Q
Topic Author
Posts: 6817
Joined: Wed May 09, 2001 12:40 pm

Angled nose gear leg

Mon Mar 05, 2018 3:10 am

The DC10, MD11 and A320 series aircraft
are a few types that have a pronounced
‘forward angled’ nose gear


Curious as to why it was designed this way,
there is a disadvantage, in a tight turn the nosewheel on the outside of the turn actually comes off the ground, not good
for steering, especially when its wet



So what were these designers thinking?
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Nicoeddf
Posts: 820
Joined: Thu Jan 10, 2008 7:13 am

Re: Angled nose gear leg

Mon Mar 05, 2018 12:49 pm

Max Q wrote:
The DC10, MD11 and A320 series aircraft
are a few types that have a pronounced
‘forward angled’ nose gear


Curious as to why it was designed this way,
there is a disadvantage, in a tight turn the nosewheel on the outside of the turn actually comes off the ground, not good
for steering, especially when its wet

So what were these designers thinking?

Edited because of own stupidity.
Last edited by Nicoeddf on Mon Mar 05, 2018 1:13 pm, edited 1 time in total.
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fr8mech
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Joined: Mon Sep 26, 2005 9:00 am

Re: Angled nose gear leg

Mon Mar 05, 2018 12:57 pm

Nicoeddf wrote:
all of those A/C retract their gear backwards.


None of them retract to the rear.
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Lpbri
Posts: 131
Joined: Tue Sep 27, 2016 7:18 pm

Re: Angled nose gear leg

Mon Mar 05, 2018 12:59 pm

A320 nose gear retracts forward. DC10/MD11 also.
 
Nicoeddf
Posts: 820
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Re: Angled nose gear leg

Mon Mar 05, 2018 1:13 pm

fr8mech wrote:
Nicoeddf wrote:
all of those A/C retract their gear backwards.


None of them retract to the rear.


Then disregard everything I said! :D Thanks for the correction.
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StereoTechque
Posts: 159
Joined: Sat Nov 28, 2015 7:24 am

Re: Angled nose gear leg

Mon Mar 05, 2018 7:19 pm

Max Q wrote:
The DC10, MD11 and A320 series aircraft
are a few types that have a pronounced
‘forward angled’ nose gear
Curious as to why it was designed this way,
there is a disadvantage, in a tight turn the nosewheel on the outside of the turn actually comes off the ground, not good
for steering, especially when its wet
So what were these designers thinking?


The DC10, MD11 and A320 series aircraft do have the forward tilted NLG gear. It is called Caster Angle.
Link: https://en.wikipedia.org/wiki/Caster_angle

On the above mentioned aircrafts, all have a positive caster angle to maximise straight line stability of the gear. As to why some aircrafts have them and some dont, understand that all aircrafts manoeuvre differently so it is the designers wish. A tight turn on these aircrafts sure lifts up the offside gear but the wheel in contact with ground does its job just fine.
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CanadianNorth
Posts: 3215
Joined: Sat Aug 24, 2002 11:41 am

Re: Angled nose gear leg

Tue Mar 06, 2018 1:42 am

Not a designer, so I don't know.

A couple of my guesses though...
- Shorter distance to retract, so shorter/smaller/lighter retract jack?
- One tire off the ground during sharp turns would mean more weight on the tire that remains on, which would actually increase traction on a hard surface and make cornering easier (just like a pickup truck in winter, in two wheel the drive axle tends to fail at traction and spin out on the snow and ice, but throw 100 or 200 pounds of whatever is handy in the box and then the drive axle bites in and it goes just fine again)
- My brain seems to figure at higher speeds such as takeoff and landing having the gear angled forward a bit would actually decrease bending stress on the gear leg. Not sure if I would count that though because the same brain cells also figure that during a hard landing you'd want the gear leg straight up and down while the aircraft is in a typical touchdown attitude to reduce bending forces, which would leave the gear angled back slightly during taxi (on a tricycle gear aircraft of course, taildraggers would be different story).
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jetmech
Posts: 2342
Joined: Wed Mar 29, 2006 2:14 am

Re: Angled nose gear leg

Tue Mar 06, 2018 2:04 am

StereoTechque wrote:
The DC10, MD11 and A320 series aircraft do have the forward tilted NLG gear. It is called Caster Angle.

Exactly, this geometry being similar to the rake and trail of bike steering.

On the B747, A330 / A340 for instance, the nose gear leg is straight up and down.



Self centering in this case is achieved by having the centreline of the axle behind the centreline of the oleo, which provides geometry similar to a shopping trolley castor.

Regards, JetMech
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