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Title: Mini HLG -9" WS Post by: kiran rc on May 26, 2018, 12:23:29 PM 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 Title: Re: Mini HLG -9" WS Post by: kiran rc on May 26, 2018, 12:27:14 PM Polyhedral wing followed by the construction of tail section.
Title: Re: Mini HLG -9" WS Post by: kiran rc on May 26, 2018, 12:33:01 PM 0.8mm CF rod used for fuse stick.
Title: Re: Mini HLG -9" WS Post by: K K Iyer on May 26, 2018, 09:17:53 PM @ 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 ;D Await test flight video... Title: Re: Mini HLG -9" WS Post by: kiran rc on May 27, 2018, 09:01:40 PM @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. Title: Re: Mini HLG -9" WS Post by: K K Iyer on May 27, 2018, 09:29:52 PM 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 Title: Re: Mini HLG -9" WS Post by: K K Iyer on May 27, 2018, 10:31:02 PM @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... Title: Re: Mini HLG -9" WS Post by: kiran rc on May 28, 2018, 11:36:01 AM 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.
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