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Author Topic: New 12" CLG  (Read 1215 times)
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Skymon
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« on: February 28, 2018, 03:16:50 AM »

I'm back in the hall next Tuesday so I knocked up this 12" CLG on Monday night.
Not from plans, just cut up some wood and foam.
I bought 15 square metres of foam over the weekend, so I needed to use some up... Cheesy

Terrible picture sorry.

What is evident is the area on the wing where I used a pot of acetone to hold it steady....
There must of been a drip on the bottom as it melted a nice aerodynamic feature in to the top surface.

Live and learn
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New 12" CLG
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OZPAF
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« Reply #1 on: February 28, 2018, 08:01:16 AM »

It's now a bit lighter and possibly with a built in left turn(slightly more drag) Smiley

The tail looks courageous - a right wee tiny one Smiley

Good luck with it.

John
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Skymon
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« Reply #2 on: February 28, 2018, 08:29:14 AM »

I just went for a massive wing area.
Does make the tail look little though...
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Skymon
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« Reply #3 on: March 15, 2018, 11:39:38 AM »

This little thing lasted two good throws...
Wing just ripped straight off.
It's a learning exercise Smiley

I can see why those big F1N's flex so much now.

Back to the drawing board.

I'm getting regular 20+ second flights with my little 10" HLG in my local sports hall.
But that things is only getting about half way to the ceiling.
I just can't sling it any higher.

I added some bluetak as a weight and that's what allowed me to get up where I am.

I don't think just adding mass will help in the long run, so I'm on a larger span plane now that will carry more mass and more wing area.

S
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Skymon
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« Reply #4 on: July 18, 2018, 10:32:33 AM »

Another two pingers made this week.
Looking forward to seeing if these get to the ceiling.
Both lightweight 12 inchers with various bits of foam and carbon.
Careless use of acetone has created a unique and novel turbulator feature on one wing.... Wink

Fuselage is 2mm pultruded carbon tube taper sanded to 1.1mm at the rear.
Not sure if it saves a lot of weight but it certainly makes a lot of dust.

S
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Re: New 12" CLG
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OZPAF
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« Reply #5 on: July 18, 2018, 08:01:07 PM »

They look neat S. Indoor HLG seems to require a lot of practice and learning. I imagine you have studied Old Bill's efforts here on HPA. The second glider looks like one of his WIFI series.

His method of using balsa and carbon for the  fuselages seems like a good way to go.

John
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Skymon
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« Reply #6 on: July 19, 2018, 03:16:05 AM »

John
both catapult and HLG are really easy to get in to and really hard to master.
I have managed step 1.

The catapult launched have a wingspan limit of 12" for the BMFA indoor class, so they are nice little things.

I have read all I can on HLG and CLG.
I have downloaded every single plan I can find.
I do tend to end up just picking bits and bobs from various sources and making a plane.
Both planes have wings from HLGs that have been scaled down. They use pultruded carbon tube for the fuse.
I have no ambition for world domination, I'm playing Smiley

The CLG in particular has some really tricky challenges.
A launch at very high speed and a glide at the lowest speed possible.
Superlight weight but high local strength.
It's a nice little paradox.

S
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OZPAF
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« Reply #7 on: July 19, 2018, 04:30:13 AM »

Well good luck with it - I'm enjoying your journey.

John
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Snaky Stringer
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« Reply #8 on: July 19, 2018, 05:41:30 AM »

A novice inquiry: what does pultruded mean? Extruding by pulling, perhaps? I think I might try to experiment with small hand launch or catapult gliders. Certainly easy to get into but as you say, difficult to master, like everything else in this crazy hobby/obsession.
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Skymon
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« Reply #9 on: July 19, 2018, 09:52:19 AM »

Pultrusion is just the manufacturing process used to make the cheaper carbon rods and tubes.
Essentially the carbon fibre is saturated in resin and then pulled through a die and cured on the way.
It means the tubes have all fibres aligned axially.
Nice and stiff but can be crushed or split easily.

Other ways to make carbon tube are more complex involving winding and braiding.

Standard 6mm pultruded carbon is about £6 a metre, wrapped is at least double that depending on the properties.

For glider fuselages you can also use carbon fishing pole tips.
these are spiral wrapped and have a nice taper and are pretty cheap from the far east.
Also for the bigger sizes, tip launched high ceiling, you can look at kite spars.
Skyshark do a response range which are light and tapered.
Just check out the specs for indoor kites and read up on the carbon they use.


Or just use balsa - it's worked for a long time.

I like the carbon tubes in 2 and 3mm diameters as they are tough and cost about £1 for a CLG fuse.
For me tough is good Smiley


I use easycomposites in the UK for carbon, they do nice stuff and are very quick to deliver.
Carbon from China on Ebay can be very variable.

Where do you fly??
S
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Snaky Stringer
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« Reply #10 on: July 19, 2018, 04:27:38 PM »

I don't do much flying these days but am trying to get back in. Building quite a lot but mainly refurbishing old models. Rubber scale is my main interest and in fact I don't really do anything else. I found what may be an almost complete CO2 engine the other day but I have never used it. I also had a little glow plug engine once but gave it away after a bit many years ago, having decided that rubber was the limit of my technical ability. Tried a few simple chuck gliders too but found them a bit frustrating. I am sort of thinking of converting a Keil Kraft Grumman Panther to catapult launch, It will need new wings and tail but that shouldn't take long. I have a little recreation ground down the road a bit that would do for a few test flights. I live in West Wales and there isn't much free flight activity round here. There is an RC club that does some indoor flying and I have made tentative approaches but fitting it in might be difficult for family reasons. A small chuck or catapult glider or both should fit into my building programme quite easily. Used to be in SAM 35 and considering reenlisting.
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Olbill
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« Reply #11 on: October 01, 2018, 06:32:24 AM »

Another two pingers made this week.
Looking forward to seeing if these get to the ceiling.
Both lightweight 12 inchers with various bits of foam and carbon.
Careless use of acetone has created a unique and novel turbulator feature on one wing.... Wink

Fuselage is 2mm pultruded carbon tube taper sanded to 1.1mm at the rear.
Not sure if it saves a lot of weight but it certainly makes a lot of dust.

S

These look really nice! Did you have any luck with either of them? Do BMFA rules specify a 3" max chord like AMA? What material did you use for the foam? Did you hand sand the foam?
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Mefot
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« Reply #12 on: October 01, 2018, 07:45:33 AM »

Current rules seem very simple. I suspect building and trimming a successful model is not so simple !!!  Grin
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Re: New 12" CLG
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Skymon
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« Reply #13 on: October 01, 2018, 10:50:27 AM »

Rules are pretty simple but CLG and HLG provide a complex problem indoors.
They spend the first 1% of their flight time going like a bullet and then they are expected to float like a butterfly.
Imagine shooting a butterfly from a pistol...


The hardest challenge for me is making something tough enough to survive the launch.
I build light and they fall to bits.

I'm building tough now and then going lighter where I can.
At least I can get some flights in.

The weak joints are normally the fuse to pylon, or the central wing dihedral.

There are a number of nice plans out there and they provide a great place to start.

Si
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piecost
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« Reply #14 on: October 01, 2018, 11:40:39 AM »

Skymon, that is a great similie. What span and mass due you think is appropriate for Eton; the nationals venue? It has a 28' ceiling (to the beams). I didn't take a close look at Marks winning model. I quite like the idea of hotwiring a
Blue foam wing model.
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Skymon
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« Reply #15 on: October 02, 2018, 09:30:41 AM »

CLG has to be 12" span.
Which makes things easier.
I'm on the low end of the learning curve right now, so I've got nothing of any use to contribute  Cheesy Cheesy

I've started a plane based on Mr Benns Kitchen Sink but with a carbon tube fuse.

I think the HLGs are a bit more of a challenge, I am starting with a plan called Lazy bird - there are two versions, standard and light for lower halls.

I am off to Wickham tonight but I have nothing glider ready to fly.
Hopefully next month.. I'll start a new thread.
Si

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