MINHAS866 Posted May 8, 2015 Share Posted May 8, 2015 Hello expertssir 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 Quote Link to comment Share on other sites More sharing options...
AMPTestFE Posted May 13, 2015 Share Posted May 13, 2015 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. Quote Link to comment Share on other sites More sharing options...
MINHAS866 Posted May 15, 2015 Author Share Posted May 15, 2015 sir bundle of thanks and what about stresses during reversing is there any effect? Quote Link to comment Share on other sites More sharing options...
AMPTestFE Posted May 18, 2015 Share Posted May 18, 2015 I'm not sure I know a good answer on that. Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted May 18, 2015 Share Posted May 18, 2015 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. Quote Link to comment Share on other sites More sharing options...
AMPTestFE Posted May 21, 2015 Share Posted May 21, 2015 NATOPS, I wonder if the structure is built to withstand 19,600 in either direction longitudinally....I would tend to think it is not. Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted May 21, 2015 Share Posted May 21, 2015 (edited) The torque would be "felt" the same as forward thrust (same rotation) the propeller forces would change.. Edited May 21, 2015 by NATOPS1 Quote Link to comment Share on other sites More sharing options...
GVS Posted May 21, 2015 Share Posted May 21, 2015 On "A" models,when the mains hit the runway or the dirt or the grass,the pwr. levers were over the gate and headed for reverse! Quote Link to comment Share on other sites More sharing options...
AMPTestFE Posted May 26, 2015 Share Posted May 26, 2015 Right...I understand torque would be felt the same...so no worries with the Lord mounts. What about the structure holding the nacelle on the wing though? Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted May 29, 2015 Share Posted May 29, 2015 (edited) 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 May 29, 2015 by NATOPS1 Quote Link to comment Share on other sites More sharing options...
ec130 Posted June 14, 2015 Share Posted June 14, 2015 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. Quote Link to comment Share on other sites More sharing options...
MINHAS866 Posted July 6, 2015 Author Share Posted July 6, 2015 sir thanks to all for a wonderfull feed back to my post Quote Link to comment Share on other sites More sharing options...
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