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by bjt4888
December 19th, 2014, 6:17 pm
Forum: Wright Stuff C
Topic: Design
Replies: 178
Views: 35485

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: 35485

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: 35485

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: 9055

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: 35485

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: 35485

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: 36794

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: 36794

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)
by bjt4888
May 15th, 2014, 10:05 am
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 36794

Re: Elastic Launched Glider C

I would like to support the comments by "calgoddard" about the possibility of electric motor powered Wright Stuff. I think that the students get a lot out of the complexity of analysis that rubber power provides. The need to evaluate and test rubber torque to optimize duration and rubber tension aga...
by bjt4888
April 27th, 2014, 7:23 pm
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 36794

Re: Elastic Launched Glider C

Jeff, I attended several hours of the Michigan State Science Olympiad Tournament Elastic Launch Glider event and saw a number of high-quality gliders. The ceiling height was measured using a laser range-finder and we estimated that the height to the base of the girders at the peak of the ceiling was...

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