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Old Jul 21, 2011, 06:46 AM
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Quote:
Originally Posted by flying1 View Post
yep, you got to to get up dam early to teach them kiwis a new trick.
Not fair. Kiwis have a time zone advantage.
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Old Jul 21, 2011, 09:23 PM
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United States, WI, Stoddard
Joined Dec 2009
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I finally found the high start I want to buy .Then I read about this ,very interesting! I'll probably get the high start,but when I go to three meters I just might spring for it.More videos would be great, especially launching three meter woody's.Thanks for this thread.
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Last edited by doc993; Jul 22, 2011 at 08:19 PM. Reason: spelling
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Old Jul 21, 2011, 09:42 PM
Proud member of LISF and ESL
LI, New York, USA
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the plane launched in the video looks to be a 2.5 or 3M plane. Perhaps a Sagitta 900.
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Old Jul 22, 2011, 07:39 AM
3 Sons - Legos and Lift
2motheus's Avatar
Grand Rapids, MI
Joined Apr 2004
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Quote:
Originally Posted by aeajr View Post
the plane launched in the video looks to be a 2.5 or 3M plane. Perhaps a Sagitta 900.
Yes - it's a stretched Sagitta 900 with a 122" span. Occasionally my wife does the pulling honors. Since you're supplying the energy, smaller planes require even less effort.
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Old Jul 22, 2011, 08:23 AM
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OK, so there is your video of a 3M plane. The launch shown looks quite nice.

Stretched Sagitta 900 would not be extremely light by today's standards. It would be heavier than an AVA at 40 to 45 ounces.

That Stretched Sagitta would probably be similar to a Supra 3.4M moldie, a Thermal Dancer bagged wing 3.1M or a kit built Bird of Time woodie all of which would be in the 55 to 65 ounce range and 900 to 1100 sq inch wing area.

I would say this is a good representation for a 3M glider being launched.
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Old Jul 22, 2011, 09:02 AM
Making wood fly since 2007
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USA, MN, Rochester
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I am curious how well it works when launching on fields where the grass is longer. Some of my fields are not nicely mowed grass but are longer field grass maybe 6 to 12 inches tall. Any reports of the pulleys jamming up with debris? I really like your concept.

Wayne
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Old Jul 22, 2011, 10:02 AM
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USA, MI, Grand Rapids
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The field where I used the One Winch was pretty crappy in terms of ground cover. Tall scrubby grass waist high in places, over uneven ground . So I think I can speak for those conditions.

The design of the sled will glide over / through tall grass as it slides forward. Clogging of the pulleys with debris will not be the issue. If the grass is so thick as to let the sled ride up, off the ground, over the grass, the sled could tip onto it's side. If the sled is not upright during line retrieval the lines will get twisted up a bit.

On rough terrain, when retrieving the line, if you feel any increase in resistance, stop pulling and check the sled position. If you force it, the twisted lines can track off the pulleys and make a bit of a mess.

If you have a friend along simply having them hold the sled while you pull the line back will make it a non-issue.

A solo flying "fix" might be to bring a couple of 18-24 inch stakes, a 20ft (ish) length of extra line and a carabiner clip. Stake the line a foot or so off the ground alongside the path you walk when launching... Before you retrieve, clip the sled handle to the raised line. The sled should then remain upright, supported by the line.

*NOTE I have not actually tried this, but I believe the concept is valid.
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Old Jul 22, 2011, 03:39 PM
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Fresno CA
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What would happen if you use it on wet grass, will the bearings in the pulleys rust? During the spring time the grass is often wet with dew at the field that we fly from
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Old Jul 22, 2011, 04:41 PM
3 Sons - Legos and Lift
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Grand Rapids, MI
Joined Apr 2004
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Quote:
Originally Posted by Windependence View Post
I am curious how well it works when launching on fields where the grass is longer. Some of my fields are not nicely mowed grass but are longer field grass maybe 6 to 12 inches tall. Any reports of the pulleys jamming up with debris? I really like your concept.

Wayne
Great question, Wayne.

One of the design goals was for the OneWinch to be a one person operation. We accomplished that goal, but could not cover every possible field condition. We know it works well on grass (mowed or brush-hogged), snow, and freshly cut alfalfa. Even flying alone I'm sure there are ways to accommodate each field's needs with ideas like Nathan's.

For those of you with experience, please share what you learn. We can at least provide more options in the instructions, if not improvements to future versions.

Tim
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Old Jul 22, 2011, 05:07 PM
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Grand Rapids, MI
Joined Apr 2004
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Quote:
Originally Posted by RWCLOUD View Post
What would happen if you use it on wet grass, will the bearings in the pulleys rust? During the spring time the grass is often wet with dew at the field that we fly from
The bearing surfaces are oil-impregnated brass sleeves. Rust is not a concern.

However, this allows me to address a related issue. Since the sled pulleys are near the ground, they can be exposed to dust, blades of grass, and anything else the line pulls through. The debris will not damage either the pulleys or the bearings, but it can build up and cause some resistance. The most that's been required to restore free movement is a puff of air or silicon spray.

Again, thank you for the questions.

Tim
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Old Jul 22, 2011, 08:18 PM
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Better more in depth video's would be really good ,thanks !
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Old Jul 23, 2011, 05:33 PM
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What happens when a pop-off occurs? If you're self-towing do you end up on your behind in the grass--trying to save a low-level errant plane?
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Old Jul 23, 2011, 07:08 PM
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Grand Rapids, MI
Joined Apr 2004
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Yes - as with any hand towing method, a sudden release of the line can be a letdown. With the OneWinch you can at least see and feel the pop-off in the making. A sudden increase in line pressure along with the plane pitching up means you should get your feet back under you.

Today I lost the plane in the sun on a launch. I just eased up on the pressure, allowed the plane to come back into view, then resumed my pull. What I'm saying is that it's a more gentle and variable process than an electric winch, and not an irreversible process like a hi-start. We flew our 122" stretched Sagitta and my son's 18 ounce 48" rudder-elevator trainer without changing anything in the setup.

This isn't a system that pushes your plane to the limits.

Tim
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Old Jul 23, 2011, 07:29 PM
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Huntsville
Joined Oct 2003
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I got out today and tried out the One Winch. It's pretty neat.

It's been well thought out and has undergone some wringing out, everything works well. It's pretty ingenious in fact. If you are a gadget freak you will appreciate it.

I launched my Ava Pro in little to no wind a bunch of times. The launches were safe and high enough. Not as strong as a winch, but more than adequate. The zoom is pretty mild but there is a bit of energy to play with at the top.

The pull is easier than my HoseMonster initially, but it doesn't taper until you want it to. It is sort of like a high start, but controllable like a winch. If you don't like a high start because of shoulder problems then One Winch might be a good thing for you.

I'm not sure I'd want to try to launch my 4 meter Xplorer on a calm day, but with some wind it would probably work out OK.

Yes, you are walking backwards and flying the plane at the same time. If you can't walk and chew gum at the same time then get somebody else to tow the plane. I haven't managed to fall down yet, but it's certainly possible.

I like the feel of the launch. You can feel the plane load up when it hits a thermal or some wind shear. This will be instructive for a lot of folks.

For lightly loaded woodies this is a great launch method. For landing practice it's going to be pretty handy as well. I think my turnaround time between launches will ultimately be a bit quicker than with a short high start.

I think it will be easy to rig it for 50% less speed and double the tension if I want to launch a heavier plane on a breezy day. I'll probably give this a shot sooner or later. In such a situation the probability line breaks and the like will be increased, so a bit of discretion will be in order.
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Old Jul 23, 2011, 09:01 PM
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Great review Rob Thanks.I wonder how a slope ship would launch on a windy day,that could be lot's of fun.
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