PPRuNe Forums - View Single Post - New big prop, facing the A320 & 737: TurboLiner.
Old 14th May 2008 | 13:46
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Mad (Flt) Scientist
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Joined: Sep 2002
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From: La Belle Province
Some comments on the aerodynamic configuration, if I may.

Control System Architecture

Looks like the elevator and rudder are manual, or at best hydraulically-boosted manual. (Tabs on both surfaces, horns on the elevators). Yet the ailerons have no tabs of any kind, and you've got "high speed" ailerons, which implies to me a purely hydraulic solution for roll control. I don't think that's a consistent approach; you're going to have to build in a level of hydraulic redundancy to address the roll axis, so you may as well use the same systems for the other axes too.

I'm not convinced of the need for a "high speed" aileron option, nor am I convinced that not having spioilerons is a good choice.

I see no provision for ground lift dumping, other than the slightly oddly located "direct lift spoilers". Why are they so far forward - they are going to infringe on the fuel tank volume sat in the middle of the chord. Usually they'd go just ahead of the flaps so they could mount on the rear spar.

The h tail looks a bit small, as indeed does the rudder.

The wing isn't "dressed" so I'm guessing you're assuming artificial stall protection?

It looks like you've got AI protection only either side of the nacelle - with the new rules for icing that unprotected outboard wing is going to be a real drag, no pun intended. If you're going to leave the wing unprotected you'll need a big wing, and still may have problems.

The wing/body fairing looks too small, just by eye.

Re the emergency exits: maybe you can argue that the UC door is the step-down surface and avoid slides? Need to align the forward exit with the gear door in that case.
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