Depends on the glider and airfoil if the flap position is critical.
On the LS6 the flaps hardly work! Hence the LS8. It only took them 10
years to figure this out but they had the DLR polar test (including
flap settings) for the LS6 back in 1984 showing this.
Flying smoothly has many benefits - you are less likely to make
yourself sick, the path flown through the air is shorter and your
variometer is likely to work better. Lower G loads mean the G induced
transients in the Total Energy line are lower and the vario is esier
to interpret. It is difficult enough to do this with the effects of
horizontal gusts. Fortunately that is about to end (the sensitivity
to horizontal gusts). Dynamis is *very* smooth as in the real world
vertical air motions aren't usually completely sharp edged.
Flying through the best air and avoiding the worst is the aim in
cruise. Removing the effects of horizontal gust will make this much
easier for even small values of airmass vertical motion.
As flying through the best AIR (not necessarily the lowest glider
sink rate - it varies as you change airspeed) is what you need to do,
those who aren't using netto or relative netto to remove the effects
of varying glider sink rates with speed are operating with a self
imposed handicap. See the article on Basic glider instruments on our
website for a detailed explanation.
Drag rakes have never been all that popular because of a couple if
issues with getting them to work properly. I think my design fixes that.
Mike
.
At 06:48 PM 3/04/2014, you wrote:
Adam and others
It must be 30 years ago Brad Edwards wanted to try one out when he
was owner IIC ASW20. We made up a very low speed airspeed indicator
out of a vario and calibrated it. Brad flew a season with it. The
discovery he made was to always fly smoothly and never ever do
sudden pull ups with G as this really added to drag. He already knew
but you had to use flaps correctly - slightly wrong then huge
drag. He never fitted it again next season and maybe he then got
ASW20B I can not remember. It would be worth phoning Brad (H 0267
711733) if you want to know more.
After learning from the drag rake he certainly flew very
well. Actually the best way to learn is fly with him and see how
smoothly he flys.
Not to do with drag rake but Brad really searches out good air and
goes out of the way to avoid heavy sink.
Ian McPhee
On 3 April 2014 17:45, Adam Woolley
<<mailto:[email protected]>[email protected]> wrote:
G'day all,
An odd question to throw out to the group, does anyone have a drag
rake instrument that they'd be willing to lend out? I'm keen to do
some flight data testing on my Ventus 1.
Particularly to determine optimum flap settings* for differing
wingloadings, but also perhaps to experiment with turbulator chord
positions and thickness.
*the flight manual & Dick Johnson FTR's show differently, as I'm
sure Idaflieg would too!
Cheers,
WPP
_______________________________________________
Aus-soaring mailing list
<mailto:[email protected]>[email protected]
To check or change subscription details, visit:
<http://lists.internode.on.net/mailman/listinfo/aus-soaring>http://lists.internode.on.net/mailman/listinfo/aus-soaring
_______________________________________________
Aus-soaring mailing list
[email protected]
To check or change subscription details, visit:
http://lists.internode.on.net/mailman/listinfo/aus-soaring
Borgelt Instruments - design & manufacture of quality soaring
instrumentation since 1978
www.borgeltinstruments.com
tel: 07 4635 5784 overseas: int+61-7-4635 5784
mob: 042835 5784 : int+61-42835 5784
P O Box 4607, Toowoomba East, QLD 4350, Australia
_______________________________________________
Aus-soaring mailing list
[email protected]
To check or change subscription details, visit:
http://lists.internode.on.net/mailman/listinfo/aus-soaring
