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by bjt4888
April 22nd, 2014, 9:51 am
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 36816

Re: Elastic Launched Glider C

Astroidea, A flapper glider could be very successful in a 40' ceiling height site. See the website "Hip Pocket Aeronautics", Builders Plan Gallery, Indoor Gliders, "Cat 2 AMA Record Standard Class Glider" plan by "OlBill". Of course, this plan is for AMA class and the wingspan would have to be reduc...
by bjt4888
April 1st, 2014, 9:56 am
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 36816

Re: Elastic Launched Glider C

Smithy0013, Jeff Anderson has given you a very big hint in his post. Test different size forplanes. Also, see the canard design calculator I posted a link to several pages back in this forum. With a conservative static stability margin entered into this calculator (like 15%), and all other area and ...
by bjt4888
March 3rd, 2014, 3:58 pm
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 36816

Re: Elastic Launched Glider C

Smithy0013, Congratulations on your success. 20 second flights in a low ceiling gym is quite good. The purpose of tip washout is to reduce lift induced drag. As approximately 50% of drag for these small gliders is induced drag, (other types of drag are "skin" drag and profile drag) reducing it will ...
by bjt4888
March 2nd, 2014, 1:06 pm
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 36816

Re: Elastic Launched Glider C

Correct, less washout for the right wingtip for a glider that circles to the right. Bend in the washout during test flying. It is not necessary to washout during construction. Be sure to understand my previous post; only the last 1" of the wingtip TE (1" along the span) is washed out. The chordwise ...
by bjt4888
March 2nd, 2014, 9:57 am
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 36816

Re: Elastic Launched Glider C

Fanjiatian,
Sorry, I meant 1/32" washout on the right wing tip and 1/16" on the left. Less washout for the inboard wing panel relative to the glide circle direction.

Bjt4888
by bjt4888
March 2nd, 2014, 9:52 am
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 36816

Re: Elastic Launched Glider C

Fanjiatian, Here is a methodology that my students have used toadd washout to the Littl Sweep wing tips: 1. Usually, the glide circle produced by the plan specs is between 30' and 35', a little too big for a single basketball court sized gym. The students add a very small amount of additional right ...
by bjt4888
March 1st, 2014, 12:13 pm
Forum: 2014 Build Events
Topic: Helicopters B
Replies: 180
Views: 32676

Re: Helicopters B

I would like to express my thanks to Jeff Anderson, Matt Chalker and John Schubert for answering my questions about judging the helicopter event. All comments and suggestions were very helpful. The invitational event that I judged went very smoothly thanks to your assistance and thanks to a super se...
by bjt4888
February 28th, 2014, 6:35 pm
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 36816

Re: Elastic Launched Glider C

Jeff, I would suggest the following possible ideas for future year Wright Stuff: 1. Span limit and overall length limit to make transport reasonable 2. No wing chord limit or stabilizer or rudder limits to allow creative designs that push performance 3. Maybe allow student to choose either a modifie...
by bjt4888
February 26th, 2014, 7:55 pm
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 36816

Re: Elastic Launched Glider C

Fanjiatian, For the typical tapered, semi-eliptical small glider planform, washout of the wingtips should improve performance by reducing lift induced drag. For thin wing wood like 1/32" or thinner, heating the area with your breath and bending works fine. Typically, for this size glider the area be...
by bjt4888
February 25th, 2014, 6:06 pm
Forum: 2014 Build Events
Topic: Helicopters B
Replies: 180
Views: 32676

Re: Helicopters B

jgrischow1, Congratulations on your extensive research. Another website you will want to reference related to rubber powered indoor free flight is Hip Pocket Aeronautics. There are a significant number of world and national record holders posting on this forum. Here is a link to a thread that includ...

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