Auto-Towing - why is this not more popular?

On Monday, October 5, 2015 at 7:32:02 PM UTC-6, Sean Fidler wrote:
From the guy who ran the Cadilac auto-tow camp last year...

"Auto-tow pointers" - Cadillac, MI camp

Gliders: ASW12, ASK21, ASW15, RS15, and some others
Tow vehicle: Late model Ford Fairmont, V8, 305 cubic inch
Tow rope: Initially, dacron 1500 ft The next year spectra 1500ft
Runway length 5200 ft (field elevation - 800 msl)
Average altitude gain 1000 to 1200 ft (occasionally 1500ft)
Get away rate for cross country: 75%

Highlights:
Six pilots auto-tow launch endorsed in one day and a 12-year annual (Thank you Stan & Carol)
Over 100 hours of XC in the 12 from auto-tow in 1 yr

Lowlights: introduced to a club with many solo pilots, not many tow pilots, and left the unit with them for a year. They never used it!

Auto-Tow unit description: 1500 ft.rope on a reel powered by a Ford starter motor 1950's vintage (exposed shaft beyond motor housing) controlled by a dead man type switch. Reel in time about 1 minute. Easily fits in trunk. The emergency release mechanism is a larger copy of Schweizer tow release mounted to a hitch with a rope to the driver. The driver has radio communication to glider. The driver is any person that is willing. The driver is instructed to accelerate smoothly until glider lifts off and then add 5mph unless told otherwise. Normally, this meant (after glider lift off) full to the floorboard (and to remember that the runway does have an end!).

Note: the glider has a window that, if looked out of, shows the whole operation. So remind the driver as you see her, or him nearing the end.

For those of you that think this technique is not proper well, ok. For those that are willing, this is a way to launch sailplane with: 1) less cost and 2) no need for a tow pilot or tow aircraft. This auto-towing technique is ideal for any "club" with a willing group of two or more. Oh yes, the safety checks were performed on all gliders used. They all had properly functioning, carefully inspected tow releases.

sidenote - one fine lady got to boast that she jerked three guys off and kept them all up at the same time

Sean (still shaking my head at the sidenote).
7T

The former Enstone GC in the UK used autotow for several years. Parafil was used as it could be dragged along the tarmac without appreciable wear. Parafil is not pulley friendly (they tried). It was easily spliced.
Case study, http://linearcomposites.net/media/pa...e_study_13.pdf

The club moved on to winches before we wore out the parafil. 1500ft plus launches were done on a 500m length using an XJ-6 Jaguar with 275hp. We just pulled it back to the launch point at 65mph. Near tangled though we did snag a couple of things in the tall grass on the north side of the runway.

That engine replaced the 150hp Bedford diesel in one of the ex-ATC winches. Another winch was refitted with the motor and transmission from a stolen Rolls Royce that was burned on the airfield one night.

I don't think the third ex-ATC winch was ever put into service before the club folded.

Maybe some lurker knows the fate of those winches.

Frank Whiteley

The former Enstone GC in the UK used autotow for several years.
Parafil
wa=
s used as it could be dragged along the tarmac without
appreciable wear.
P=
arafil is not pulley friendly (they tried). It was easily spliced.
Case study,
http://linearcomposites.net/media/pa...e_study_13.pdf

The club moved on to winches before we wore out the parafil.
1500ft plus
l=
aunches were done on a 500m length using an XJ-6 Jaguar with
275hp. We
jus=
t pulled it back to the launch point at 65mph. Near tangled
though we did
=
snag a couple of things in the tall grass on the north side of the
runway.

That engine replaced the 150hp Bedford diesel in one of the ex-
ATC
winches.=
Another winch was refitted with the motor and transmission from
a stolen
=
Rolls Royce that was burned on the airfield one night.

I don't think the third ex-ATC winch was ever put into service
before the
c=
lub folded.

Maybe some lurker knows the fate of those winches.

Frank Whiteley

I learned to fly at Enstone in the late 70s but my recollections of
parafil are very different. Once the outer sheath had been worn
through on retrieves the cable broke on about 1 in 5 launches.
Since we were using scrapper cars we mounted the cable
attatchment in the middle of the roof. This solved the problem of
lifting the weight off the rear wheels when towing.
We also built a special which used a Ford Transit pickup with a mid
mounted 4.2litre Jaguar engine. We retained the original axle which
gave us very good acceleration but a top speed of about 60mph.

I now fly at Lasham which used to use Autotow. We now use
modern winches which give better and safer launches to 1700-
2000ft on a normal day. The cost of buying, maintaining and
running costs of autotow were much higher than the winch in the
UK. Gasoline about $7.50 a gallon here. Winch runs on LPG.

At 12:43 06 October 2015, Nigel Pocock wrote:

The former Enstone GC in the UK used autotow for several years.
Parafil
wa=
s used as it could be dragged along the tarmac without
appreciable wear.
P=
arafil is not pulley friendly (they tried). It was easily spliced.
Case study,
http://linearcomposites.net/media/pa...e_study_13.pdf

The club moved on to winches before we wore out the parafil.
1500ft plus
l=
aunches were done on a 500m length using an XJ-6 Jaguar with
275hp. We
jus=
t pulled it back to the launch point at 65mph. Near tangled
though we did
=
snag a couple of things in the tall grass on the north side of the
runway.

That engine replaced the 150hp Bedford diesel in one of the ex-
ATC
winches.=
Another winch was refitted with the motor and transmission from
a stolen
=
Rolls Royce that was burned on the airfield one night.

I don't think the third ex-ATC winch was ever put into service
before the
c=
lub folded.

Maybe some lurker knows the fate of those winches.

Frank Whiteley

I learned to fly at Enstone in the late 70s but my recollections of
parafil are very different. Once the outer sheath had been worn
through on retrieves the cable broke on about 1 in 5 launches.
Since we were using scrapper cars we mounted the cable
attatchment in the middle of the roof. This solved the problem of
lifting the weight off the rear wheels when towing.
We also built a special which used a Ford Transit pickup with a mid
mounted 4.2litre Jaguar engine. We retained the original axle which
gave us very good acceleration but a top speed of about 60mph.

I now fly at Lasham which used to use Autotow. We now use
modern winches which give better and safer launches to 1700-
2000ft on a normal day. The cost of buying, maintaining and
running costs of autotow were much higher than the winch in the
UK. Gasoline about $7.50 a gallon here. Winch runs on LPG.

For info.
The RR engine powered winch is at north wales gliding club, we are
putting it back in service as our chevy powered winch destroyed its
gearbox last sunday with wave all over the site so the pw6 pilot the only
launch of the day managed to get a nice wave flight, so the RR will get
another lease of life starting this week end with a bit of luck.
KF.

I've had a lot of fun Auto Towing at Sunflower in the last few years. Twice when I've had family visiting, we've taken them up in the 2-33 on Auto Tow, with Leah driving and me flying. Everyone gets involved in the operation, everyone has fun, and it's cheap.

We have a lot of room. We usually start the launch from wherever the glider stopped on landing, usually with around 6000 feet remaining. Usually we use a 2000 foot-ish long rope. Usually we get our 2-33 to around 1000 feet AGL without much extra effort. We could accelerate faster, we could pull harder, and we would have more rope breaks and more wear and tear on the car and the glider. There is a lot of extra wear and tear on everything involved, whether winch launching or auto towing, to get that last 10% of altitude.

When I was giving my grandparents rides and my little sister her first flying lessons on Labor Day, we had a great wind gradient and our best launch in the 2-33 was 1500 AGL. This is on the "nose" aerotow hook.

One of our club members has built a few pulleys but we haven't had a chance to test them out. I am kind of more interested in a 3:1 reduction with a moving and fixed pulley. This allows the towing car to also have a tow release in case the glider can't release. Also reduces the car speed, increases acceleration, and allows you to use less runway.

We've almost exclusively been auto towing the last few years with my 3.6L 2014 Subaru Outback with a homemade schweizer-like tow release in the receiver hitch.

I'd like to get a hitch mounted rope rewinder along with the tow release. Then I think that with a parachute on the glider end we could wind the rope in before the end hit the ground, greatly reducing our wear and tear and not hurting the turn around time much.

Sometimes when I'm dreaming I think that a mobile glider school with an auto tow rig and a two seater on a trailer could be fun. There are a lot of people out there who are interested in flying gliders but just don't live within a convenient distance to a club or commercial operation.

After reading about Casey Aviation's Auto Towing (http://flycasey.com/auto-towing-a-glider/) we got some of the flat pull tape that he was talking about. It is cheap, available in long lengths, and plenty strong enough. Unfortunately it just didn't last at all on our rough old runway and its almost impossible to splice. At least it wasn't an expensive experiment.

On Tuesday, October 6, 2015 at 6:45:08 AM UTC-6, Nigel Pocock wrote:
The former Enstone GC in the UK used autotow for several years.
Parafil
wa=
s used as it could be dragged along the tarmac without
appreciable wear.
P=
arafil is not pulley friendly (they tried). It was easily spliced.
Case study,
http://linearcomposites.net/media/pa...e_study_13.pdf

The club moved on to winches before we wore out the parafil.
1500ft plus
l=
aunches were done on a 500m length using an XJ-6 Jaguar with
275hp. We
jus=
t pulled it back to the launch point at 65mph. Near tangled
though we did
=
snag a couple of things in the tall grass on the north side of the
runway.

That engine replaced the 150hp Bedford diesel in one of the ex-
ATC
winches.=
Another winch was refitted with the motor and transmission from
a stolen
=
Rolls Royce that was burned on the airfield one night.

I don't think the third ex-ATC winch was ever put into service
before the
c=
lub folded.

Maybe some lurker knows the fate of those winches.

Frank Whiteley

I learned to fly at Enstone in the late 70s but my recollections of
parafil are very different. Once the outer sheath had been worn
through on retrieves the cable broke on about 1 in 5 launches.
Since we were using scrapper cars we mounted the cable
attatchment in the middle of the roof. This solved the problem of
lifting the weight off the rear wheels when towing.
We also built a special which used a Ford Transit pickup with a mid
mounted 4.2litre Jaguar engine. We retained the original axle which
gave us very good acceleration but a top speed of about 60mph.

I now fly at Lasham which used to use Autotow. We now use
modern winches which give better and safer launches to 1700-
2000ft on a normal day. The cost of buying, maintaining and
running costs of autotow were much higher than the winch in the
UK. Gasoline about $7.50 a gallon here. Winch runs on LPG.


Interesting. I can only recall 2-3 repairs. We knotted the dacron in a protective rubber bumper. We did move in winches within a year, so I really only had a single season with the parafil. Enjoyed the Jag though.

Frank Whiteley

At 04:29 06 October 2015, Frank Whiteley wrote:
On Monday, October 5, 2015 at 7:32:02 PM UTC-6, Sean Fidler wrote:
From the guy who ran the Cadilac auto-tow camp last year...
=20
"Auto-tow pointers" - Cadillac, MI camp
=20
Gliders: ASW12, ASK21, ASW15, RS15, and some others =20
Tow vehicle: Late model Ford Fairmont, V8, 305 cubic inch=20
Tow rope: Initially, dacron 1500 ft The next year spectra 1500ft
Runway length 5200 ft (field elevation - 800 msl)
Average altitude gain 1000 to 1200 ft (occasionally 1500ft)=20
Get away rate for cross country: 75%
=20
Highlights: =20
Six pilots auto-tow launch endorsed in one day and a 12-year annual
(Than=
k you Stan & Carol)
Over 100 hours of XC in the 12 from auto-tow in 1 yr=20
=20
Lowlights: introduced to a club with many solo pilots, not many tow
pilo=
ts, and left the unit with them for a year. They never used it!
=20
Auto-Tow unit description: 1500 ft.rope on a reel powered by a Ford
star=
ter motor 1950's vintage (exposed shaft beyond motor housing)
controlled
by=
a dead man type switch. Reel in time about 1 minute. Easily fits in
trun=
k. The emergency release mechanism is a larger copy of Schweizer tow
relea=
se mounted to a hitch with a rope to the driver. The driver has radio
comm=
unication to glider. The driver is any person that is willing. The
driver=
is instructed to accelerate smoothly until glider lifts off and then add
5=
mph unless told otherwise. Normally, this meant (after glider lift off)
fu=
ll to the floorboard (and to remember that the runway does have an
end!). =
=20
=20
=20
=20
For those of you that think this technique is not proper well, ok. For
t=
hose that are willing, this is a way to launch sailplane with: 1) less
cost=
and 2) no need for a tow pilot or tow aircraft. This auto-towing
techniqu=
e is ideal for any "club" with a willing group of two or more. Oh yes,
the=
safety checks were performed on all gliders used. They all had properly
f=
unctioning, carefully inspected tow releases. =20
=20

=20
Sean (still shaking my head at the sidenote).
7T

The former Enstone GC in the UK used autotow for several years. Parafil
wa=
s used as it could be dragged along the tarmac without appreciable
wear.
P=
arafil is not pulley friendly (they tried). It was easily spliced.
Case study,
http://linearcomposites.net/media/pa...e_study_13.pdf

The club moved on to winches before we wore out the parafil. 1500ft
plus
l=
aunches were done on a 500m length using an XJ-6 Jaguar with 275hp.
We
jus=
t pulled it back to the launch point at 65mph. Near tangled though we
did
=
snag a couple of things in the tall grass on the north side of the
runway.

That engine replaced the 150hp Bedford diesel in one of the ex-ATC
winches.=
Another winch was refitted with the motor and transmission from a
stolen
=
Rolls Royce that was burned on the airfield one night.

I don't think the third ex-ATC winch was ever put into service before the
c=
lub folded.

Maybe some lurker knows the fate of those winches.

Frank Whiteley


For info
The winch with RR engine is at north wales gliding club,
our other winch destroyed it,s gearbox on sunday so the Rolls Royce is to
be put back to work this weekend with some luck.
KF