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Author Topic: F1N for cat III  (Read 953 times)
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boca55
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« on: April 17, 2017, 07:09:51 PM »

My new model F1N cat. III call "Easter". Wingspan 720mm, weight 20,1 gram.
Wing balsa 5mm, Depron 3mm. A model designed to competition at the Belgrade fair, from 7-9 July.
http://i43.photobucket.com/albums/e374/watt1992/Easter%201_zpsvrx1hipe.jpg
http://i43.photobucket.com/albums/e374/watt1992/Easter%202_zpskwtvgov7.jpg
F1N for cat III
F1N for cat III
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OZPAF
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« Reply #1 on: April 17, 2017, 09:43:25 PM »

Very nicely made glider. The wing clips onto the low pylon?

John
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boca55
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« Reply #2 on: April 18, 2017, 02:49:03 AM »

Yes, wings are mounted on the bottom pylon and ensure adhesive tape. This model has a slightly slimmer profile of 4.5%, but it has the ability to change the angle of attack, so I hope to be able to achieve maximum height.
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OZPAF
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« Reply #3 on: April 18, 2017, 04:45:42 AM »

Thanks - good luck with it.
John
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boca55
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« Reply #4 on: April 18, 2017, 09:12:31 AM »


Here is a plan, just baked.
http://i43.photobucket.com/albums/e374/watt1992/F1N%20Eister_zpsne4xq4ki.jpg
F1N for cat III
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Olbill
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« Reply #5 on: April 18, 2017, 11:36:39 AM »

Bosko
I just built a new glider based on Lazar's Dark NG dimensions. Dark NG is for Cat 1 and the flat wingspan is 576mm. Easter's wingspan is 720mm. What is your thinking on what size glider to build?

Specifically I'm wondering why most of the Cat 1 F1N's that I see are smaller than Easter?
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boca55
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« Reply #6 on: April 19, 2017, 02:49:22 AM »

Olbill,
My experience is that if you want to achieve a height of 8m to model Cat.1 you must have a model of 8 grams. I'm flying model range 640 mm and weighing 11 grams. The model had a slightly thicker profile 4mm. With this model I won in 3 national championships.  It's great plan but it would be better that is easier for at least 2 grams. For hull I used carbon tube 2 / 1mm, but this is wrong. A better solution is a carbon tip for telescopic rod so facilitate the model for 1 gram.
I think that the model range 600-640 mm and weighting 7-8 grams, right measure for F1N Category 1.
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Olbill
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« Reply #7 on: April 19, 2017, 01:17:18 PM »

My most successful HLG had a flat span of 711mm and a flat area of 645 cmsq. Weight was 8+ grams (I don't remember exact weight).

It sounds like we are in pretty close agreement there, but it seems that many Cat 1 F1N's are smaller like Slow Poker size. I guess if you can match the Slow Poker flight times you are in pretty good shape. I don't know anyone who has done that.
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Olbill
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« Reply #8 on: August 27, 2017, 01:01:28 PM »

I tried recycling some old parts to come up with a new Cat 2 glider. The first picture is the new glider and the second one is one that I built several years ago that didn't work. I removed the silk reinforcing and the weird tips from the old wing. Span is 680mm, chord is 76mm and area is about 390 cm2. Weight at this point is 14.4 g. Reinforcing on the wing is a carbon rod top and bottom - I don't know what size. The rods may be split rods. Split rods would make more sense b/c they can be buried flush with the balsa.

It seems to glide like a rock which might be due to a strange airfoil or it may be that I'm not used to the higher wing loading.

I may build a new wing at this size and try to reduce the weight.
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Re: F1N for cat III
Re: F1N for cat III
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mimino
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« Reply #9 on: August 28, 2017, 03:52:59 PM »

That's really nice work
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