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« on: May 26, 2018, 12:23:29 PM »
kiran rc
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Hi,
Tried Building a mini hlg for the challenge posted here.
http://www.rcindia.org/kites-trains-free-flight-and-all-others/one-minute-flight/
It was a quick build.(Took an hour and a half )
Specifications:
Material- 0.75mm Balsa
WS- 9inches
Weight- 4g


IMG_20180526_102059.jpg
Mini HLG -9" WS
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« Reply #1 on: May 26, 2018, 12:27:14 PM »
kiran rc
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Polyhedral wing followed by the construction of tail section.

IMG_20180526_105403.jpg
Re: Mini HLG -9" WS
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« Reply #2 on: May 26, 2018, 12:33:01 PM »
kiran rc
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0.8mm CF rod used for fuse stick.

IMG_20180526_113912.jpg
Re: Mini HLG -9" WS
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« Reply #3 on: May 26, 2018, 09:17:53 PM »
K K Iyer
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@ kiran rc,
Outstanding work, as expected from you!

If 4gms AUW is correct, its a real achievement. My 9” HLGs are in 9-10gm range!

You said you used 0.75mm balsa. I can see that the stab, fin and pylon look like 1/32”, or 0.75mm.

But the wing?
From the airfoil shape and a close look at the thickness of the left tip in the first pic, the wing seems to have been carved from 2 or 3mm balsa, and not curved from 0.75mm sheet.
Which one is it?

Your balsa stock seems to be of contest quality (6lbs/cuft or less). Where did you get it?
Can you weigh one of your sheets and tell me?
(6lb/cft weighs about 10gms per 1mm thickness in a 100mm x 1000mm sheet)

BTW, the wood grain for the pylon needs to be vertical, not horizontal. Reason will become apparent when you try a full power throw  Grin

Await test flight video...
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« Reply #4 on: May 27, 2018, 09:01:40 PM »
kiran rc
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@K K Iyer
Sir, the wing is curved from 0.75mm balsa. (Soaked with warm water and then heat treatment)
I got the balsa sheets from Aliexpress. The stock are mixed up with both A/B grains. Single sheet of 250mm*100mm weighs about 1.8-2g.

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« Reply #5 on: May 27, 2018, 09:29:52 PM »
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Excellent purchase.
If your weight data is correct, it means you are getting A/B grain 5-6lbs/cuft, which is contest quality.
(We can discuss C grain privately...)
Gives you a big advantage in this challenge.
Most of mine is 50% heavier.

Would you care to post a few hints on the ‘One minute challenge’ thread for the benefit of the other entrants?

More specifically, can you guide Taksh on that thread?

Thanks
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« Reply #6 on: May 27, 2018, 10:31:02 PM »
K K Iyer
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@K K Iyer
Sir, the wing is curved from 0.75mm balsa.

From the first pic looked like top carved from 2-3mm with flatbottom...
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« Reply #7 on: May 28, 2018, 11:36:01 AM »
kiran rc
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I guess this is the pic you are referring too. The shadow makes it look like having a carved aerofoil. The fact is that I've slightly curved the edges to make a good joint between the pieces.

IMG_20180528_113007.jpg
Re: Mini HLG -9" WS
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