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#11
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Nose Wheel Steering for Retracts
Dan wrote:
Drew Dalgleish wrote: On Wed, 24 Jun 2009 08:13:28 -0500, Dan wrote: I'm looking for a simple design for nose wheel steering for retractable gear. Any ideas? Dan, U.S. Air Force, retired Have you considered just having a castering nosewheel? That's what I have on my floats and it works pretty well steering with the brakes. Yes, differential braking is probably the simplest method. I'm not discarding it, just poking around at options. Dan, U.S. Air Force, retired Thisis an interesting pic. http://www.infinityaerospace.com/Oriion_TS_gear.jpg Not a lot of detail there, but the steerable strut seems to poke thru the top and would meet with a steering link (tiller/thingie) there. |
#12
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Nose Wheel Steering for Retracts
On Jun 24, 10:28*pm, cavelamb wrote:
Dan wrote: Drew Dalgleish wrote: On Wed, 24 Jun 2009 08:13:28 -0500, Dan wrote: * I'm looking for a simple design for nose wheel steering for retractable gear. Any ideas? Dan, U.S. Air Force, retired Have you considered just having a castering nosewheel? That's what I have on my floats and it works pretty well steering with the brakes. * Yes, differential braking is probably the simplest method. I'm not discarding it, just poking around at options. Dan, U.S. Air Force, retired Thisis an interesting pic. http://www.infinityaerospace.com/Oriion_TS_gear.jpg Not a lot of detail there, but the steerable strut seems to poke thru the top and would meet with a steering link (tiller/thingie) there. I keep thinking about the "T-Bar" idea. If the rudder pedals had control horns extending below the pedals hinge line with push rods attached that extended forward to ball bearing rollers that pushed on the right and left of the "T-Bar", that would provide the reverse action to make the steering work right. A push on the right pedal would pull back the push rod and roller attached to it and the left pedal would push it's pushrod and roller forward to turn the "T-Bar" to the right. When the gear was retracted, the pushrods wouldn't have anything to push on. If the nose gear strut was directly below the pedals, the pedals could just have "spurs" with rollers on them. |
#13
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Nose Wheel Steering for Retracts
bildan wrote:
On Jun 24, 10:28 pm, cavelamb wrote: Dan wrote: Drew Dalgleish wrote: On Wed, 24 Jun 2009 08:13:28 -0500, Dan wrote: I'm looking for a simple design for nose wheel steering for retractable gear. Any ideas? Dan, U.S. Air Force, retired Have you considered just having a castering nosewheel? That's what I have on my floats and it works pretty well steering with the brakes. Yes, differential braking is probably the simplest method. I'm not discarding it, just poking around at options. Dan, U.S. Air Force, retired Thisis an interesting pic. http://www.infinityaerospace.com/Oriion_TS_gear.jpg Not a lot of detail there, but the steerable strut seems to poke thru the top and would meet with a steering link (tiller/thingie) there. I keep thinking about the "T-Bar" idea. If the rudder pedals had control horns extending below the pedals hinge line with push rods attached that extended forward to ball bearing rollers that pushed on the right and left of the "T-Bar", that would provide the reverse action to make the steering work right. A push on the right pedal would pull back the push rod and roller attached to it and the left pedal would push it's pushrod and roller forward to turn the "T-Bar" to the right. When the gear was retracted, the pushrods wouldn't have anything to push on. If the nose gear strut was directly below the pedals, the pedals could just have "spurs" with rollers on them. Here's my fantasy design. Two tiny motorbike master cylinders, one on each rudder pedal, and one slave cylinder on a horn each side of the nose wheel. Then the wheel could rotate and retract, and the hose pipes from brake flexibles, would just flex. (Difficult to make this light enough, I imagine.) Brian W |
#14
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Nose Wheel Steering for Retracts
Brian Whatcott wrote:
bildan wrote: On Jun 24, 10:28 pm, cavelamb wrote: Dan wrote: Drew Dalgleish wrote: On Wed, 24 Jun 2009 08:13:28 -0500, Dan wrote: I'm looking for a simple design for nose wheel steering for retractable gear. Any ideas? Dan, U.S. Air Force, retired Have you considered just having a castering nosewheel? That's what I have on my floats and it works pretty well steering with the brakes. Yes, differential braking is probably the simplest method. I'm not discarding it, just poking around at options. Dan, U.S. Air Force, retired Thisis an interesting pic. http://www.infinityaerospace.com/Oriion_TS_gear.jpg Not a lot of detail there, but the steerable strut seems to poke thru the top and would meet with a steering link (tiller/thingie) there. I keep thinking about the "T-Bar" idea. If the rudder pedals had control horns extending below the pedals hinge line with push rods attached that extended forward to ball bearing rollers that pushed on the right and left of the "T-Bar", that would provide the reverse action to make the steering work right. A push on the right pedal would pull back the push rod and roller attached to it and the left pedal would push it's pushrod and roller forward to turn the "T-Bar" to the right. When the gear was retracted, the pushrods wouldn't have anything to push on. If the nose gear strut was directly below the pedals, the pedals could just have "spurs" with rollers on them. Here's my fantasy design. Two tiny motorbike master cylinders, one on each rudder pedal, and one slave cylinder on a horn each side of the nose wheel. Then the wheel could rotate and retract, and the hose pipes from brake flexibles, would just flex. (Difficult to make this light enough, I imagine.) Brian W I had considered that as I mentioned elsewhere in this thread. The problems I can't get past is how to cut it out when retracted to reduce rudder pedal effort and how to not interfere with differential braking. I would think a castering nose wheel would be best with differential braking, but one that's being steered could make for some interesting effects. Dan, U.S. Air Force, retired |
#15
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Nose Wheel Steering for Retracts
On Jun 30, 5:52*am, Dan wrote:
Brian Whatcott wrote: bildan wrote: On Jun 24, 10:28 pm, cavelamb wrote: Dan wrote: Drew Dalgleish wrote: On Wed, 24 Jun 2009 08:13:28 -0500, Dan wrote: * I'm looking for a simple design for nose wheel steering for retractable gear. Any ideas? Dan, U.S. Air Force, retired Have you considered just having a castering nosewheel? That's what I have on my floats and it works pretty well steering with the brakes.. * Yes, differential braking is probably the simplest method. I'm not discarding it, just poking around at options. Dan, U.S. Air Force, retired Thisis an interesting pic. http://www.infinityaerospace.com/Oriion_TS_gear.jpg Not a lot of detail there, but the steerable strut seems to poke thru the top and would meet with a steering link (tiller/thingie) there. I keep thinking about the "T-Bar" idea. *If the rudder pedals had control horns extending below the pedals hinge line with push rods attached that extended forward to ball bearing rollers that pushed on the right and left of the "T-Bar", that would provide the reverse action to make the steering work right. A push on the right pedal would pull back the push rod and roller attached to it and the left pedal would push it's pushrod and roller forward to turn the "T-Bar" to the right. *When the gear was retracted, the pushrods wouldn't have anything to push on. If the nose gear strut was directly below the pedals, the pedals could just have "spurs" with rollers on them. Here's my fantasy design. Two tiny motorbike master cylinders, one on each rudder pedal, and one slave cylinder on a horn each side of the nose wheel. *Then the wheel could rotate and retract, and the hose pipes from brake flexibles, would just flex. (Difficult to make this light enough, I imagine.) Brian W * *I had considered that as I mentioned elsewhere in this thread. The problems I can't get past is how to cut it out when retracted to reduce rudder pedal effort and how to not interfere with differential braking. I would think a castering nose wheel would be best with differential braking, but one that's being steered could make for some interesting effects. Dan, U.S. Air Force, retired |
#16
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Nose Wheel Steering for Retracts
On Jun 30, 5:52*am, Dan wrote:
Brian Whatcott wrote: bildan wrote: On Jun 24, 10:28 pm, cavelamb wrote: Dan wrote: Drew Dalgleish wrote: On Wed, 24 Jun 2009 08:13:28 -0500, Dan wrote: * I'm looking for a simple design for nose wheel steering for retractable gear. Any ideas? Dan, U.S. Air Force, retired Have you considered just having a castering nosewheel? That's what I have on my floats and it works pretty well steering with the brakes.. * Yes, differential braking is probably the simplest method. I'm not discarding it, just poking around at options. Dan, U.S. Air Force, retired Thisis an interesting pic. http://www.infinityaerospace.com/Oriion_TS_gear.jpg Not a lot of detail there, but the steerable strut seems to poke thru the top and would meet with a steering link (tiller/thingie) there. I keep thinking about the "T-Bar" idea. *If the rudder pedals had control horns extending below the pedals hinge line with push rods attached that extended forward to ball bearing rollers that pushed on the right and left of the "T-Bar", that would provide the reverse action to make the steering work right. A push on the right pedal would pull back the push rod and roller attached to it and the left pedal would push it's pushrod and roller forward to turn the "T-Bar" to the right. *When the gear was retracted, the pushrods wouldn't have anything to push on. If the nose gear strut was directly below the pedals, the pedals could just have "spurs" with rollers on them. Here's my fantasy design. Two tiny motorbike master cylinders, one on each rudder pedal, and one slave cylinder on a horn each side of the nose wheel. *Then the wheel could rotate and retract, and the hose pipes from brake flexibles, would just flex. (Difficult to make this light enough, I imagine.) Brian W * *I had considered that as I mentioned elsewhere in this thread. The problems I can't get past is how to cut it out when retracted to reduce rudder pedal effort and how to not interfere with differential braking. I would think a castering nose wheel would be best with differential braking, but one that's being steered could make for some interesting effects. Dan, U.S. Air Force, retired I'm not sure I understand your concern. If the nose gear steering "T- Bar" is above the nose strut pivot point, it will swing forward away from the rollers as the nose gear retracts aft. There 'shouldn't' be any residual extra effort from the pushrods since they wouldn't be pushing against anything with the gear retracted. I used to fly a Grumman Tiger with a castering nose wheel. It worked OK but a long taxi in a crosswind would really heat up the downwind brake - so much so that maneuvering in the runup area could be problematic. Brake pads didn't last very long. |
#17
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Nose Wheel Steering for Retracts
On Jun 30, 5:52*am, Dan wrote:
* *I had considered that as I mentioned elsewhere in this thread. The problems I can't get past is how to cut it out when retracted to reduce rudder pedal effort and how to not interfere with differential braking. Dan, U.S. Air Force, retired A rotating valve. Similar to the one on a single handle kitchen faucet, or as used to change the control arrangement on some back/ track hoes from Cat to JD? ============== Leon McAtee |
#18
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Nose Wheel Steering for Retracts
Brian Whatcott wrote:
Here's my fantasy design. Two tiny motorbike master cylinders, one on each rudder pedal, and one slave cylinder on a horn each side of the nose wheel. Then the wheel could rotate and retract, and the hose pipes from brake flexibles, would just flex. (Difficult to make this light enough, I imagine.) Brian W I kinda suspect it would take a LOT more fluid flow than a brake master could deliver - and a lot of pressure too. |
#19
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Nose Wheel Steering for Retracts
cavelamb wrote:
Brian Whatcott wrote: Here's my fantasy design. Two tiny motorbike master cylinders, one on each rudder pedal, and one slave cylinder on a horn each side of the nose wheel. Then the wheel could rotate and retract, and the hose pipes from brake flexibles, would just flex. (Difficult to make this light enough, I imagine.) Brian W I kinda suspect it would take a LOT more fluid flow than a brake master could deliver - and a lot of pressure too. There's one FAA design requirement that I can remember: rudder pedals shall withstand 150 lbs force each, without fail or stretch. Brian W |
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