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by bjt4888
January 4th, 2015, 9:17 am
Forum: Wright Stuff C
Topic: design rules?
Replies: 7
Views: 4040

Re: design rules?

28builder, Rule 5a. reads, "...colored panel on the wing that is at least the length of the wing chord and at least between 2 wing ribs." Also, see the official Science Olympiad website FAQ responses below to questions related to this rule and rule 3g. I wrote these two question to the SO FAQ in ord...
by bjt4888
December 28th, 2014, 12:43 pm
Forum: Wright Stuff C
Topic: Design
Replies: 178
Views: 29084

Re: Design

nxtxcholar, To the best of my knowledge, test gliding an indoor rubber airplane will not provide any useful info. As the motion of the propeller has great influence in the character of the flight for these models, you need to be under power to learn anything. I would suggest constructing an airplane...
by bjt4888
December 19th, 2014, 6:17 pm
Forum: Wright Stuff C
Topic: Design
Replies: 178
Views: 29084

Re: Design

Artysophia,

Yes, the motor will always be longer than the hook to hook distance. My students are using motors that range between 14.75" and 18" depending upon the propeller pitch and/or blade area and our hook to hook distance is about 13".

Bjt4888
by bjt4888
December 19th, 2014, 5:15 am
Forum: Wright Stuff C
Topic: Design
Replies: 178
Views: 29084

Re: Design

someusername, This NASA Glenn Resource Center website is a beginners guide to aerodynamics is an excellent resource. It even has a copy of "Foilsim" that you can play with. See the index and read the "Science Fundementals", "Aircraft Forces" and "Aerodynamics" topics in order. Who knows, maybe if yo...
by bjt4888
December 18th, 2014, 6:59 pm
Forum: Wright Stuff C
Topic: Design
Replies: 178
Views: 29084

Re: Design

artysophia, 50 cm airplane length is quite short for a typical design of this wingspan and weight. Not that it wouldn't be possible to build a successful design of this length, but a longer tail moment (wing TE to stabilizer LE distance) allows a more rearward center of gravity and lower decalage an...
by bjt4888
December 17th, 2014, 6:28 pm
Forum: Wright Stuff C
Topic: Winding
Replies: 24
Views: 7279

Re: Winding

CarneyF1D, A couple of the national caliber adult indoor flyers that i am aware of have done testing recently on Tan SS and the general consensus is the batches from 2013 onward are all very good. I have some particularly good test results with November 2013. One test sample of this vintage matched ...
by bjt4888
December 17th, 2014, 6:10 pm
Forum: Wright Stuff C
Topic: Design
Replies: 178
Views: 29084

Re: Design

Science8, My students have constructed seven of these Freedom Flight airplanes so far and I will tell you how we are mounting the wingposts to the wing. You can offset the wingposts slightly to the right of the center rib (maybe against the edge of the rib location if it continued through the LE and...
by bjt4888
November 26th, 2014, 3:39 pm
Forum: Wright Stuff C
Topic: Design
Replies: 178
Views: 29084

Re: Design

I have the greatest respect for Jeff Anderson and if students read all of his forum comments carefully, they will have an excellent framework for success with this event and for a fulfilling science experience. I do however have a slightly different perspective on use of kits like the one available ...
by bjt4888
May 29th, 2014, 9:27 am
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 30787

Re: Elastic Launched Glider C

Wisguy and Plaid Suit Guy2, I agree with all of both of your comments in general. What I was wondering, and I thought pictures of the successful gliders would show, is if any of the teams attempted designs leaning toward AMA Category II parameters in order to take advantage of a 38' ceiling. For tho...
by bjt4888
May 27th, 2014, 5:08 pm
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 30787

Re: Elastic Launched Glider C

Wisguy,
Thank you very much for the results. Is the exact ceiling height and unobstructed ceiling height known? Also, were there photos taken of the top gliders as in 2013?

Thanks,
Brian Turnbull
AMA 77545 and 342672 (off and on since 1972)

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