8
$\begingroup$

The engine pylons on the Hondajet are aerodynamically shaped so as to provide a lift force laterally and outwardly.


Engine pylon as viewed from rear

enter image description here
Engine pylon as viewed from front

Are these for lateral stability or drag reduction or both or other purposes?

$\endgroup$
1
  • 2
    $\begingroup$ seems like it tries to maintain a constant cross section area between the engine and aft fuselage. it's not meant to produce any force. $\endgroup$ Apr 16 '18 at 0:12
2
$\begingroup$

There is a pretty interesting write up on the pylon design here. According to that the shape was chosen for a number of reasons including flutter reduction, stall characteristics and wave drag reduction. There is also some more info here that briefly touches on the design.

$\endgroup$
4
  • $\begingroup$ The pylon writeup and all they looked at is quite interesting reading. Cabin size, wing laminar flow, stall characteristics, flutter, etc. Too bad I can't unbolt the wing on my Cardinal, pull the engine, and replace them with a wing with 2 small jet engines! $\endgroup$
    – CrossRoads
    Apr 16 '18 at 16:43
  • $\begingroup$ @CrossRoads I think it would become an experimental but you could... $\endgroup$
    – Dave
    Apr 16 '18 at 16:50
  • $\begingroup$ Yeah, that and the cost are a pretty big disincentive :) Plus my home field does not have jet fuel, only 100LL. $\endgroup$
    – CrossRoads
    Apr 16 '18 at 18:04
  • $\begingroup$ @CrossRoads: Most (possibly all) jet engines can run on 100LL, they just need to be inspected and maintained more frequently. $\endgroup$
    – Vikki
    Jan 2 at 23:32
0
$\begingroup$

I would have to confirm but in conventional aircraft design the engines are usually in front of and below the main wing. Firstly this would allow a maximum of the fuselage to be utilized for cabin space. Also, having such highly isolated engine nacelles would provide low wave drag coefficients allowing for smooth and efficient flying at higher Mach numbers. The engine is quite large for the aircraft and because mounting engines aft on a small plane, and because it is too low to mount below the wing, it is probable that it was the only location to place the engine without making considerable compromises otherwise.

[Edit] Running a CAD model of the Hondajet through a flow sim, the upward pylons should also provide extra yaw moment stability.

$\endgroup$
2
  • $\begingroup$ Functioning as strakes? $\endgroup$
    – Mike Brass
    Apr 19 '18 at 1:07
  • $\begingroup$ Pretty much, yes. $\endgroup$
    – Jihyun
    Apr 19 '18 at 1:12

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.