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(c130) Use of reverse thrust on landing?


MINHAS866
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Hello experts

sir kindly i want to know about the use of reverse thrust after touch down? is there any limitations? is there any speed limit for revesing after landing( and why it is limited).and is there any effect on aircraft structure in case of full reverse .

any feed back will be appretiated thanks to all

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There is a maximum speed for ground idle (including Rev), as well as a minimum speed at which you get significant benefit of the reverse thrust (around 60kts).  Reverse thrust is most beneficial at higher speeds; at lower speeds you tend to just heat the engine oil up too much.

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If you have an operators manual it should have specific KIAS in the landing section. Reverse at high airspeeds (115 maybe) could cause flameout and directional control problems. As for the stresses if you think about the torque generated during reverse the prop/eng/wing is actually several thousand IN lbs below the 19.6 torque limit.

Air flow is the issue in the engine.

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The wing structure is designed to withstand the stress of torque twisting the nacelle off the wing as well as the pull and push moments experienced during forward and reverse thrust. The stress to pull the aircraft through the air (and the nacelle off the wing) would be greater than the stress of the reverse thrust which would try and push the nacelle onto the wing... The wing structure is designed to absorb the 19,600 (+) Tq and  the pushing/ pulling stress would be factored in as well. Reverse thrust is a fraction 19,600.

Edited by NATOPS1
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  • 3 weeks later...

You will not get anywhere near 19.6 out of the engines at reverse as the reverse blade angle is set to -5.5 to -8 at 96-106%rpm, flight idle blade angle is no greater than 17 so you can imagine take off blade angle in relevance with the amount of air its pulling compared to reverse. You need to make sure that your reverse torques on symetrical engines are within 1000 in lbs minhas to make sure that you do not get a yaw when landing and going to reverse. if they are out of limits there is an adjustment on the left side of the valvehousing under the cap, its the hex head with the sheath around it. other than that you arent going to rip the engines off the wing from going all 4 to max reverse when landing.

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  • 3 weeks later...

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