Vikkyvik From United States of America, joined Jul 2003, 9407 posts, RR: 27
Reply 5, posted (10 years 4 weeks 1 day 20 hours ago) and read 5143 times:
The inlets are slanted upwards in order to alighn the intakes with the local airflow, as it has been disturbed by the wings and fuselage.
In the reply in the linked thread, you stated that the horiz. stab. gives a nose-down moment, which is not correct. The H-stab gives a nose-up moment; it's an inverted airfoil, meaning it's generating lift downwards, which would obviously cause the tail end to lower and the nose to raise.
Also, adding power will cause a nose-up moment as well. The whole reason the H-stab is in existence is because the center of lift is ahead of the CG, therefore, causing a nose-up moment. Adding power will increase the aircraft speed, therefore increasing the lift. As far as as I know, this will counteract the very slight nose-down moment created by the engines increasing their thrust.
Someone correct me if I'm wrong.
"Two and a Half Men" was filmed in front of a live ostrich.
Darkblue From United States of America, joined Sep 2003, 233 posts, RR: 10
Reply 6, posted (10 years 4 weeks 1 day 17 hours ago) and read 5107 times:
This topic has been discussed before, you may want to do a search.
Note that it is the inlets of the engines that are facing up, not the actual engine. Aft-mounted engines are in the downwash of the wing so the inlets usually face upward to be aligned with the flow. Wing mounted engines are in the upwash of the wing and the inlets usually face downward to be aligned with the flow.