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Marc RC pilot

Advice on, reel, line, rubber tubbing and anchor

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Marc RC pilot

Good morning

I will be after a bungee system for launching 2 to 3 metre gliders in the next week or so.

Any advice on what I should be looking  for regarding quality/where to buy etc?

Thank you

Marc  

 

PS I was not sure where to post my request, so apologies if this is the wrong place.

 

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satinet

Emc Vega

Probably a few winches around these days due to end of f3b and f3j.

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Marc RC pilot

Thanks for head's up satinet.  They got some lovely kits there/pretty high end stuff. 

Link below if anyone else is interested.

https://www.emc-vega.de/en/index

 

 

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satinet

There aren't that many flying bungee as there used to be for obvious reasons.

Where do you fly?

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Nigel Castle

I bit the bullet and bought a complete system from EMC Vega a couple of weeks ago, it was on my doorstep less than three days later, outstanding service and great quality products.

It will last for years if looked after carefully, you will not go wrong buying from them, I was pointed in theta direction by the guys on this forum.

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Marc RC pilot
1 hour ago, satinet said:

There aren't that many flying bungee as there used to be for obvious reasons.

Where do you fly?

Just started back flying after a fair layoff last week at Wormwood Scrubs London satinet: https://www.bing.com/maps?q=wormwood+scrubs&FORM=HDRSC4

 

1 hour ago, Nigel Castle said:

I bit the bullet and bought a complete system from EMC Vega a couple of weeks ago, it was on my doorstep less than three days later, outstanding service and great quality products.

It will last for years if looked after carefully, you will not go wrong buying from them, I was pointed in theta direction by the guys on this forum.

Thanks for the advice/experience with EMC Nigel. The launch system has to be 100% sound for sure.

Do you mind me asking what type of model sizes you launch with and what launch package did you get? 

Thank you 

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Nigel Castle
1 hour ago, Slap said:

Just started back flying after a fair layoff last week at Wormwood Scrubs London satinet: https://www.bing.com/maps?q=wormwood+scrubs&FORM=HDRSC4

 

Thanks for the advice/experience with EMC Nigel. The launch system has to be 100% sound for sure.

Do you mind me asking what type of model sizes you launch with and what launch package did you get? 

Thank you 

I bought the Allround 150 Plus, this should launch many different weights and wingspans, from my Xplorer to AVA, more weight more stretch..............

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Marc RC pilot

Cheers Nigel

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LEO THOMPSON

Hi,

I think we may have met at wormwood Scrubs last weekend.. I was flying my supra off the high start. (My favourite way to fly bar slope soaring)

I got my 2 mtr class bungee from Seta tek in Germany as I have built his models and he sends a complete ready to use high start. 

I purchased my 3mtr and above high start from the states, super nice quality components and you can specify exactly your requirements.

see links below.

http://www.seta-tech.de/

https://www.aerofoam.com/complete-3m-1.html

best, Leo.

 

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pete beadle

Hi Marc and all,

I'm hoping that I might be able to help at least a few of you guys who are just starting to use a bungee, by describing a few of the techniques that can be employed to make "marginal" power bungee systems work better in practice

Firstly, wind, any wind, seriously improves the power available to be used on any launch. If you start using a bungee on a dead calm day you'll see this immediately

Secondly, you'll find that, the more ooomph you can get into the first few feet of the launch, the fewer problems will appear as you start to really get into the climb

Thirdly, the glider should be launched at roughly 45 degrees nose up, no more, and certainly no less, and you MUST launch squarely into wind ALWAYS.....every time

Don't stand , ready to launch the end of the line, any more time than you absolutely have to.......holding the bungee at full stretch really kills it over time

You can improve any launch by weaving on the line, but only after you are settled into the launch, at about a quarter of the way up, weaving stretches the line and improves the pull, especially if you feed some up elevator at the same time, but doesn't increase the total energy of the pull........that's simple Physics for you.......this is also known as "kiting"

Gauging the moment of release at the top of the launch is important too, try to get off just before the model does it for you......

Towhook position is also critical and an ordinary cup hook is often better than the releasable type because it can be "tuned" by moving it forward or back depending on the conditions.....just drill holes in front and behind the starting position and move the cup hook either way as necessary

Then there's CG position, the hook position must enable the glider to "cock" on the launch settling the glider's angle of climb to maximum effect

I won't go into caring for the bungee rubber or repairing line breaks just here but, if anyone is in any doubt as to look after their bungee rubber, please post here and I'll try to answer what you want to know.....oh, and hand winches and power winches either...... they're quite complicated to get working at 100%.......

Smooth, high launches and long flights chaps:thumbsup:

Regards

Pete

BARCS1702

 

 

  

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Marc RC pilot
On 19/05/2019 at 19:20, Stormeflyer said:

If you don’t want to outlay too much this is a U.K. supplier that sells 6mm and 8mm OD Silicon bungee in 10 mtr lengths that should get you going

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F232032593480

EABABF2E-167F-4B40-B97A-3B8B6C519B55.jpeg

 

On 19/05/2019 at 20:54, Nigel Castle said:

I bought the Allround 150 Plus, this should launch many different weights and wingspans, from my Xplorer to AVA, more weight more stretch..............

Thx Stormflyer

17 hours ago, LEO THOMPSON said:

Hi,

I think we may have met at wormwood Scrubs last weekend.. I was flying my supra off the high start. (My favourite way to fly bar slope soaring)

I got my 2 mtr class bungee from Seta tek in Germany as I have built his models and he sends a complete ready to use high start. 

I purchased my 3mtr and above high start from the states, super nice quality components and you can specify exactly your requirements.

see links below.

http://www.seta-tech.de/

https://www.aerofoam.com/complete-3m-1.html

best, Leo.

 

Hi Leo! Yes we did indeed. How could I forget your Shinto and other amazing birds in your quiver...I still cant get over how light your Shinto is and how slow/beautiful she can fly when you was scratching for lift last week and how well she cut's into wind...Dream of Dreams :)   

Thanks for advice and links.

See you at Scrubs sometime soon I hope.

Cheers 

Marc

 

 

17 hours ago, pete beadle said:

Hi Marc and all,

I'm hoping that I might be able to help at least a few of you guys who are just starting to use a bungee, by describing a few of the techniques that can be employed to make "marginal" power bungee systems work better in practice

Firstly, wind, any wind, seriously improves the power available to be used on any launch. If you start using a bungee on a dead calm day you'll see this immediately

Secondly, you'll find that, the more ooomph you can get into the first few feet of the launch, the fewer problems will appear as you start to really get into the climb

Thirdly, the glider should be launched at roughly 45 degrees nose up, no more, and certainly no less, and you MUST launch squarely into wind ALWAYS.....every time

Don't stand , ready to launch the end of the line, any more time than you absolutely have to.......holding the bungee at full stretch really kills it over time

You can improve any launch by weaving on the line, but only after you are settled into the launch, at about a quarter of the way up, weaving stretches the line and improves the pull, especially if you feed some up elevator at the same time, but doesn't increase the total energy of the pull........that's simple Physics for you.......this is also known as "kiting"

Gauging the moment of release at the top of the launch is important too, try to get off just before the model does it for you......

Towhook position is also critical and an ordinary cup hook is often better than the releasable type because it can be "tuned" by moving it forward or back depending on the conditions.....just drill holes in front and behind the starting position and move the cup hook either way as necessary

Then there's CG position, the hook position must enable the glider to "cock" on the launch settling the glider's angle of climb to maximum effect

I won't go into caring for the bungee rubber or repairing line breaks just here but, if anyone is in any doubt as to look after their bungee rubber, please post here and I'll try to answer what you want to know.....oh, and hand winches and power winches either...... they're quite complicated to get working at 100%.......

Smooth, high launches and long flights chaps:thumbsup:

Regards

Pete

BARCS1702

 

 

  

Yes and be careful when launching into gales or you might fold your wings on the way up....(I am still haunted by that memory/was like in slow motion) :D.

Great   advice as always Pete, thank you.

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Stormeflyer

We have regularly used standard 5mm builders bungee chord and braided fishing line to the ring to hook on the model on really blustery days to blast “DS Planks” out from the ridge with great success. The trick was leave the sticks alone.............and only do this with a trimmed model 😳

When we got bored on calm days we used to crank up the tension even more and see how high we could launch...............we expected to see the fuselage disappear over the ridge and the wings stay on the ground! 😂

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Marc RC pilot
On 20/05/2019 at 09:47, LEO THOMPSON said:

Hi,

I think we may have met at wormwood Scrubs last weekend.. I was flying my supra off the high start. (My favourite way to fly bar slope soaring)

I got my 2 mtr class bungee from Seta tek in Germany as I have built his models and he sends a complete ready to use high start. 

I purchased my 3mtr and above high start from the states, super nice quality components and you can specify exactly your requirements.

see links below.

http://www.seta-tech.de/

https://www.aerofoam.com/complete-3m-1.html

best, Leo.

 

Hi Leo

 

I am going to go for that 3m complete bungee system from areofoam.com, just waiting for confirmation of uk delivery info/pricing etc. I decided to go with the convertible one to give me option to fly on a shorter field if needed (100ft.of rubber with 500' line with snap swivels at 50' on the rubber and 250' on the line)

I was tempted to go for a 2m complete set up as well but cannot justify it at the mo (I'll be using DLG near that wingspan range and mainly interested in 2.5m/3.5m upwards for the larger soarers of a line). 

Thanks for link etc 👍

 

Edit: after being contacted by aerofoam/Alan the costs are very high for complete system (100 bucks!). On advice it makes good sense to get  the 50m of 3m bungee with chute which gets up to 400 feet launch height and caters for smaller fields also. Braided Nylon can be sourced here as well as stake/reel. Shipping cost 30 bucks.  

Edited by Marc RC pilot
added extra info

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Merlin

may be it´s intersting foryou, how we are bungee launching over here.   We are using a short bungee system wit 7.5m of rubber and 75m of line. The rubber is the "scale" typeby EMC-Vega.  We stretch it to about 25kg when we use it in our "Sommerliga"  F3J contests  (https://www.sommerliga.org/).  It works with 15kg or 20kg as well. The more wind, the less you have to stretch it.  launch heights are between 80m and 180m. 

https://www.youtube.com/watch?v=mV5F5VWrDok

Why the "scale" rubber?   In stronger wind the smaller rubber will be ripped off!  Keepin mind: we use normal F3J planes. With smaller planes for sure you can use smaller rubber.  

/Bernd

 

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SilentPilot

I've had good success launching my Ka-8 on a hi-start.

My Radian too, goes up like it was designed as a bungee launch, obviously it should self launch! 

Different bungees btw :D

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StraightEdge

Specifically for 2m RES postal, where we're limited to 10m of 6mm OD (4mm ID), I've just ordered 20m of this stuff from China (for £11.45 plus £1.00 postage) as spare:

https://www.ebay.co.uk/itm/1-20M-Natural-Latex-Rubber-Surgical-Tube-Band-Elastic-Slingshot-Catapult-1-7-12/323757660344?hash=item4b6175d8b8:g:~58AAOSwlw1dyKp~

So cheap at that it doesn't matter if it turns out to be below-standard... anything will be better than the now useless HK stuff, which was good when I bought mine 18mths ago!

Jon

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