I only used either the EK Remote Release tow hook which I converted
to a capture tow hook for models up to 115 inch span such as the
Paragon. These models didn't zoom very well and I could usually do
as well by towing as slow as possible to minimize the amount of
towline reeled in. Nothing is more hopeless than to zoom a Sailaire
so I always towed as slow as possible and used a capture tow hook to
avoid popoffs. The only capture tow hook that was strong enough for
Sailaire size models was the Rocket City Protow. Ten years ago when
I was having eye problems, I flew a Sailaire in Unlimited at the
Nats. I towed so slow the winchmaster always made me launch either
first or last.
As I said before, a conventional tow hook could be made into a
capture tow hook by installing a retractable pin at the back of a
regular tow hook. The pin would have to be retracted to hook up the
tow hook. If this was done with a servo, both the transmitter and
receiver would have to be on to hook up. The pin would then be
retracted after stabilized in the launch and before starting the zoom
so it shouldn't affect the zoom.
Chuck Anderson
At 06:20 PM 2/1/2008, you wrote:
Capture tow-hooks don't work well with zoom-launching techniques.
Operation of such increases pilot load during arguably the most
critical portion of a sailplane flight, seemingly causing a problem
rather than solving one.
FYI, those older types of (nylon) hooks can bind and not release at
high line tension: I know this because I had it happen and destroy a
plane. (in combination with a ratcheting winch - another bad idea).
For the forgetful, perhaps a Remove-Before-Flight device (flag
connected to plug-type switch, etc.) would solve the problem.
Using such a device is a no-brainer that requires only a low-tech
approach and costs only pennies.
Ain't old age wonderful?
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