If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#5
|
|||
|
|||
poor lateral control on a slow tow?
On Dec 31, 9:35*am, sisu1a wrote:
Sure, even more with flaps equipped ships! But yaw control seems to be more affected than roll. Can we explain that? Just a little faster please is what doctor ordered here...usually 5 mph more is enough to a more pleasant tow. I'm going to assume your flying with a nosehook, in which case the big tether is resisting motion in the yaw axis... whereas for roll the towrope runs directly down the longitudinal axis, leaving airspeed/AoA as the dominant external forces affecting roll. The rope also holds the glider at unnatural attitudes for given airspeeds, which I think contributes a lot to the lack of perceived (less than usual for that particular airspeed) aileron authority, contributing greatly to making the glider feel horrible on tow, despite being well within it's stall speed. Not as an endorsement for or against this arrangement but from an aerodynamic prospective rather, a CG hook leaves the yaw axis pretty free to swivel accordingly and likely reduces the rope induced AoA affecting aileron authority as well *once in a steady climb. (*not to be confused with the up pitching tendency these hooks are famous for during the initial acceleration of a launch...) -Paul Since the possible influence of hook position has been introduced, I'll have to add that all my tows in the 28 have been on the CG hook as were all my tows in the 19 I had before that. One factor that has not been mentioned yet is the fact that a ballasted glider has much higher roll inertia that a dry one. This will require larger aileron inputs to get the same roll response and I suppose could lead to an aileron stall. I don't remember ever having loss of control authority on an unballasted tow and maybe there is more to that than just the difference in stall speeds. Andy |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
another poor man's car engine conversion | jan olieslagers[_2_] | Home Built | 19 | February 22nd 09 03:49 PM |
Poor readability | Kees Mies | Owning | 2 | August 14th 04 04:22 AM |
Poor Guy | Bob Chilcoat | Owning | 6 | July 17th 04 06:45 PM |
I'm grateful for poor people who are willing to murder & die | Krztalizer | Military Aviation | 0 | April 20th 04 11:11 PM |
Concorde in FS2002: No lateral views | A. Bomanns | Simulators | 3 | July 19th 03 11:33 AM |