On Thu, 22 Nov 2012 09:00:21 -0800, Karen wrote:
> Good point. US Postmaster here with a day off, so have time today to
> surf & read and post. When we read the paper Bill D sent us re
> accelerated roll rates starting with a wing down, we modified procedures
> not to launch w/o runner in any cross-wind situation.
>
Rewrite that to "We won't do a winch launch without a wing runner in ANY
circumstances". Please!
> More the guys
> invented a device to hold the tail of a taildragger down so it wouldn't
> slam down during takeoff.
>
Why? A tail-dragger's tail never slams down (after all it's already on
the ground) but, on a winch launch, some gliders can snap-rotate on lift-
off if you don't know what you're doing. I know this applies to Libelles
and Ka-8s, but there are probably others that do it too. Fast rotation
rotation at lift-off is dangerous and its prevention is one of the things
that the recent UK winch launch safety campaign emphasized.
As for nose-wheel gliders, the only type we ever hold the tail down for
is the DG-500/505. If you don't have fingers on the top of its fin to
keep the tail-wheel on the ground, it WILL slam its tail down as the
winch gets all-out.
This doesn't happen with the other two-seat nose-sitters I've flown:
ASK-13, ASK-21, Grob G-103 Acro and Puchacz. In fact these do the
opposite: you may need a bit of back stick to pick the nose up and get
the glider nicely balanced on the main wheel before it lifts off.
I think I know what I'm talking about here: the number of aero tows I do
a year can usually be counted on the fingers of one hand. All the rest
are winched.
--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |