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Post  rdw777 Sat 22 Jun 2024 - 14:59

I’ve built a few….. This one is Thermic 20 designed by Frank Zaic…. Taken from his Model Glider Design yearbook, Copyright 1944 …. Easy to scale up from instructions in the book….Practically no support equipment needed… Simple hand launch or light catapult ….I’ve had a few simple gliders get caught in lift and just fly away…. Kind of bitter sweet but awesome to see happen …. Good excuse to build another…. Got the main blocks roughed out so now a bunch of carving and sanding…..

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Post  Ken Cook Sat 22 Jun 2024 - 15:51

These designs look simple but in reality these take a long time to build correctly. If you want to learn how to sand properly, these are the models to learn on. In addition, whenever I build these, I like to take 1/32" strips of spruce or pine and glue them to the leading edge in order to prevent nick damage. While many will think this isn't a necessity, it prolongs the lifespan of the model immensely. In addition, substituting lightweight bass or spruce for the fuse also makes the experience enjoyable.

My first experience was the Thermic B by Jetco. My dad gave the kit to me and the first thing he said was read the instructions. When your done, read them again. I tore into the model and cut two of the same sides for the airfoil not realizing there was a left and a right. He was quite mad at me. Not because I cut it wrong but because I didn't follow his direction. I ended up throwing the kit away. Fast forward 30 years and I was devoted to building another. This time I threw the kitchen sink at it. I doped it with red and yellow tissue and it was beautiful. My son launched it and it was aloft for close to 7 minutes in which I could see it. It then flew up and away never to be seen again. This was also in the cool fall in which I couldn't believe it sought out a thermal and took off.
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Post  rdw777 Sat 22 Jun 2024 - 16:45

Agree with you 100% Ken…. They look simple on the surface but getting all the shapes and a few intentional warps right can be challenging ….You bet, I’m going armor that leading edge…. Don’t have any Spruce but have some 1/16 Bass that should take the curve well….. You probably noticed the pod and boom design….. The boom can get pretty thin after shaping and become a point to break….. This one I made in two halves that were grooved internally so I could put a piece of bamboo inside for sort of a spar for strength…..

Yep, To see your Thermic B spec out and fly away is something you and your son will never forget….I’ve had it happen with catapult gliders but not from a HLG….. I’m sure it was a beaut in those colors…. My favorite for visibility…. I snapped a photo of the plan… Kitted by Jetco and I’m sure designed by Zaic….. Certainly his style of drawing…

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Post  rdw777 Mon 24 Jun 2024 - 11:49

Got the Basswood leading edge installed…Wetting the wood helps it follow the curve….Starting to shape the wing….Taper from the center (1/4”) to about 3/32” at the tips to begin with…. A messy job best done outside ….

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Post  Ken Cook Mon 24 Jun 2024 - 15:52

One incredible glider is the Sweepette 19. This one can get lost real easy. Retro R/C sells this as a kit. Campbells Custom Kits made them and he retired. A lot can be learned trimming these.
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Post  rdw777 Mon 24 Jun 2024 - 18:29

Thanks Ken, Sweepette comes up quite alot when one reads up on HLG’s…. Long history of contest wins, And has been for a lot of years…. T-20 is just a sport glider compared to something like that…. I’ll be happy if I can get one big lazy circle and land close by…. Minimize the chase …. Plus I’m enjoying the woodworking from the old book… Thumbs Up

After it got a little hot to work on the wing outside I did a little whittling on the fuse…

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Post  rdw777 Mon 24 Jun 2024 - 18:32

Here’s the boom blank before it got glued up….

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Post  Ken Cook Mon 24 Jun 2024 - 18:45

Here's some good reading

http://www.gryffinaero.com/models/ffpages/tips/hlgtips.html
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Post  getback Tue 25 Jun 2024 - 7:54

Looking good ! How did you get that groove cut in there for the inter support ?? I got a plane with a problem at the hinges , i need to cut out some material for the hinge to set in but its very thin 1/8" .
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Post  rdw777 Tue 25 Jun 2024 - 11:32

Thanks Ken, Very timely too at this point! …... Nice article on building and pre-sets….. Trimming too, It’s own little can of worms…. Will definitely influence how we finish up!

Thanks Eric, Kind of primitive but the groove was done with a couple of small chisels I made a long time ago for some other woodworking projects…. They work fine on balsa as well….Made from square “cut nails”…. Very hard metal and will hold an edge well….One is about 1/8” and the other a little over 1/16”….

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Post  getback Tue 25 Jun 2024 - 14:14

OK Very good for cutting a long channel what I need would bee 1" by 1" so to make the tools (and those are Nice ) would bee overkill for me ... I am thinking dermal w/rotor bit tool in drill stand holder , locked in maybe can move the wood through it to get close .. Its a old plane and trashed in a few places .. Thanks Very Happy
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Post  rdw777 Wed 26 Jun 2024 - 14:26

Doesn’t look like much change but the wing is what takes a lot of work on one of these…
Sanded dead flat on the bottom…. Sanded flat on the top with a taper from
root to tip …. .250” at the root to .080 at the tip…. Checked with a mic and a straight edge along the way to be flat…For prep for next steps….

The shaded portion in the photo is the bottom of the left wing…. Will be sanded away for left tip washout to help with left turn ….. I’ll put a little washout in the right tip but not nearly as much….

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I drew a line for the high point for the airfoil at 26%….. So next steps will be: Sand in the washout, Sand leading edge top and bottom…. Sand from high point to trailing edge leaving about
1/16 TE all round…..Thoughts or changes needed?

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Post  rsv1cox Wed 26 Jun 2024 - 14:48

Two different styles contrasting.........

The careful well thought out approach of a craftsman.......

Simple Gliders Robert22

The not so careful, poorly thought out style of a measure it with a stick and cut it with an axe guy........

Hammers instead of common pins Smile

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Seriously, I love your picture Robert.  A close inspection reveals attention to detail that I wish I still possessed.
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Post  rdw777 Thu 27 Jun 2024 - 12:16

Thanks Bob Very Happy …… Lots of ways to build a model airplane…. I admire your scratch built replicas…. Without a set of plans!!….
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Post  rdw777 Sat 29 Jun 2024 - 17:10

All the carving/ sanding/shaping done….Interesting note, At least to me, The wing weighed 20.5 grams before shaping, 11 grams when finished, It lost nearly half its weight thru the process….

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Filling the grain with talcum powder, Rubbed in dry then doped over, Then sand back down to the wood…. Using Sig Lite Coat with a few drops of castor oil added….Three treatments of this on wing and fuse before tissue trim….. Making an effort to make it “slippery”…. Even with best efforts of sanding with 400 can still see micro scratches….

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Post  rsv1cox Sun 30 Jun 2024 - 7:24

It seems like a shaped wing is the way to go Robert. Build the camber/dihedral in from a block of balsa. I had no luck wetting and forming the wing on the FB Jr. as it just returned to its normal shape in a day or two after painting and especially when I mounted it in the fuselage. Dihedral, a little better as I had removed balsa from the center of the wing and glued.
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Post  getback Sun 30 Jun 2024 - 7:36

Looks pretty slippery to me , you going to have it so slick it going to fly away sunny Ju8st picking ! She is got a lot of work incorporated into the process your skill is showing good job ! sunny
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Post  rdw777 Sun 30 Jun 2024 - 11:47

Thanks Bob…..Those solid sheet wings are hard to get to hold a set sometimes….I re-steamed Firebaby’s original wing and I still have to kind of massage it back to shape after it sits for a few days….I think with enough time and fiddling with it, It will eventually stay….. The glider’s wing will eventually get cut at the center and glued back together for its dihedral…..It’s just easier for shaping and doping all in one piece…

Thanks Eric….Just enjoying twiddling with a few blocks of wood…. Pretty cheap entertainment….. If it happened to fly away just a good excuse to build another one  Very Happy
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Post  getback Sun 30 Jun 2024 - 11:57

If it happened to fly away just a good excuse to build another one Very Happy))) Now that's the attitude I like to hear LOL Laughing Just a bunch of FUN !!!! This Site Rocks! RC Plane Fishing Popcorn sunny Airplane Airplane Airplane Airplane
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Post  rdw777 Tue 2 Jul 2024 - 13:01

Starting to color trim and add final finish so I can tack the pieces together to get an idea of how much weight will be needed in the nose for balance….. Will embed some lead in the nose to try and keep the lump of clay for trimming minimized…

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Post  rsv1cox Tue 2 Jul 2024 - 14:47

The wing is very Spitfireish Robert. Elliptical - gave it an advantage over the ME-109 should you find any up there. I like the simple color scheme. Does the number 20 have any signficance?
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Post  rdw777 Tue 2 Jul 2024 - 16:41

Thanks Bob, The book has a description of how to manually draw elliptical wings and I wanted to give it a try…I always liked that shape…. Firebaby has a pretty shaped elliptical wing as well….If I happen to bump into a 109 I’m afraid he’ll get the best of me lol!!!…. The 20 is simply the wingspan- Thermic “20”…. Good excuse to add some more doo dah to it…..
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Post  getback Wed 3 Jul 2024 - 6:50

Its looking Slick with the trim Good job ! Fireworks
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Post  akjgardner Wed 3 Jul 2024 - 10:33

Nice work Robert
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Post  GallopingGhostler Wed 3 Jul 2024 - 11:55

Nice work, Robert, Reminicient of my 13-in. Jetco Thermic 18 that I built some 40 years ago, finished in couple coats of clear dope trimmed in orange dope.

https://outerzone.co.uk/plan_details.asp?ID=575 Thermic 18 from Jetco 13in span

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