Recognizing and reacting to tow plane engine failure

On 2014-10-26 09:45:47 +0000, Cookie said:

Ok...and signalling a turn by moving out to the side will not make the
towplane hit its rudder stops either ...so what's the problem?


Shall we now replace all 17 of the "standard American soaring
signals"...with "use radio"?

Cookie


If boxing the wake causes the towplane to reach control stops then you
are doing it WAY WRONG and should expect to wear the rope, yes.

Btw:

Pawnee wingspan 36 ft 2 in. So out at his wingtip you are 5.5 m off
center. On a 60m rope that's 5.3 degrees angle on the rope.

If the glider weighs 600 kg and has a 30:1 L/D at towing speed then
there will be 20 kg of pull in the rope from drag, plus (at 600 fpm, 3
m/s climb and 70 knots 38 m/s airspeed) another 48 kg pull from
climbing. Total 68 kg. About 6 kg of which will be sideways pull on the
tail.

Anyone want to figure out how much rudder deflection it takes to
produce 6 kg sideways force at 70 knots? It won't be a lot.

So, you're saying the rudder won't even be near the stop on a typical box the wake, or "please turn" signal....so what's the problem?


Cookie





On Sunday, October 26, 2014 7:03:30 AM UTC-4, Bruce Hoult wrote:
On 2014-10-26 09:45:47 +0000, Cookie said:

Ok...and signalling a turn by moving out to the side will not make the
towplane hit its rudder stops either ...so what's the problem?


Shall we now replace all 17 of the "standard American soaring
signals"...with "use radio"?

Cookie


If boxing the wake causes the towplane to reach control stops then you
are doing it WAY WRONG and should expect to wear the rope, yes.

Btw:

Pawnee wingspan 36 ft 2 in. So out at his wingtip you are 5.5 m off
center. On a 60m rope that's 5.3 degrees angle on the rope.

If the glider weighs 600 kg and has a 30:1 L/D at towing speed then
there will be 20 kg of pull in the rope from drag, plus (at 600 fpm, 3
m/s climb and 70 knots 38 m/s airspeed) another 48 kg pull from
climbing. Total 68 kg. About 6 kg of which will be sideways pull on the
tail.

Anyone want to figure out how much rudder deflection it takes to
produce 6 kg sideways force at 70 knots? It won't be a lot.