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Author Topic: finally built a HLG  (Read 1481 times)
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justwantin
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« on: September 12, 2011, 07:11:35 AM »

Hello all,

I finally got around to putting together a HLG as I discussed in a previous post. I tried shaping a wing several months ago following discussion/techniques in the topic below but was very unhappy with it. This time around I took more time to do it was satisfied enough to complete the glider. This was basically a test project learning how to work with ca glue, balsa plane, carbon fiber, etc. I started out with enlarging thermic 18 wing shape to give me a 180mm cord and 200mm length center to wingtip. Just before shaping the wing I reversed it to see if I could wrap the curve with spruce The finished wingspan is 400mm. Tail boom length is same ~ ratio as wing enlargement. The rest was just eyeball and I have no reason why I didn't use an existing plan. This just sort of happened last weekend.

I used orange shellac for a sealer and two coats of dope on the wings, one on stab and rudder. Lighter spots on wing are where I sanded through shellac. I'd probably would recoat on a serious build but I consider this more of a learning exercise. The finished weight was 28 grams. Weather has been lousy here since I finished the glider but I had a chance to take it down to a local oval for some easy straight test glides today. It required 4 grams of plasticine to get a nice straight even glide. I don't have any idea what will happen when I get around to giving it a decent toss though and I'll need to get some left turn into it.

It's now time to settle on a decent HLG plan and do something a little more serious. I have heaps of questions but I'll leave em for now
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Rewinged
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« Reply #1 on: September 13, 2011, 02:12:21 AM »

The glider looks very nice.  It doesn't look like it has a 180 mm chord, though?

I don't know if it is the finish, the wood, or the boom, but the weight is high.  You should try and get lighter with the next one.  I'm not real familiar with HLGs of this size, but a similar CLG would be at least 5g and better 10grams lighter.  But for HLG, you probably don't want it that light.

Also, you'll be looking at a plan for the next one, so these are probably moot points, but the tail boom could probably be longer and the nose shorter, but it's hard to tell just from photos.

Most importantly, though, your workmanship looks very good.  Actually, by my experience it looks pretty incredible for a second attempt!  Congrats on a fine build.  I hope it goes well when you give it a full throw!

--Bill
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justwantin
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« Reply #2 on: September 13, 2011, 05:54:11 AM »

Thanks for the comments. The cord is 80, the 180 was a tyop. I had a feeling the weight was high and in retrospect much more could have come off the wings. Whether or not the carbon fibre (hollow) boom weighs more than something of comparable strength out of balsa is an unknown. I think the finish would not be a contributing factor, one coat shellac sealer sanded out plus thinned dope wouldn't amount to much.

I built gliders as a kid and even a few as a teen (a very long time ago) and have worked with wood most of my life for money and pleasure. Small stuff like this is great fun. I recently I have been making timber andon lanterns which are framed like shoji (screens) and then have paper stretched across the panels. Not to0 far away from stick and tissue building, just heavy and they don't have to fly.

I'm in the midst of deciding between building a Thermal Scout by Mike Chapman or a Whistler by George Perryman. Actually I have plans for a Little Whistler as well albeit Little Whistler does not appear to be much smaller than the Whistler.

These three sets of plans raise some questions in my mind, however, it's probably better to start another thread rather than asking here.
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Ployd
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« Reply #3 on: March 25, 2012, 05:28:24 PM »

Nice model and don't worry about the finished weight, just go out and fly it! I see from your profile that you are near Frankston so contacting like minded HLG specialists should be easy  Wink

Ployd in OZ
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Obiwan
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« Reply #4 on: November 06, 2012, 08:02:09 AM »

I am doing the same thing that you are - trying to sort out a new skill set - have been away from modeling for a number of years - in the past have build Kordas and Gollywocks - the HLG/TLG category looks like it might be a lot of fun.  I am building a Polly from plans and hope to nail down some of the skills necessary to build and fly it.  Stan B was kind enough to answer a few questions about building and finishing.  Let me know how you progress - we might share the learning experience.
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