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by bjt4888
January 22nd, 2015, 9:51 am
Forum: Wright Stuff C
Topic: weight. thoughts?
Replies: 6
Views: 2821

Re: weight. thoughts?

28builder, Great job helping students with this project! As you deduced, weight is pretty important to achieving maximum duration. A heavier airplane will usually require thicker cross section rubber motors which will take fewer turns resulting in lower duration. The heavier airplane will also need ...
by bjt4888
January 20th, 2015, 4:19 pm
Forum: Wright Stuff C
Topic: Winding
Replies: 24
Views: 9055

Re: Winding

Toms_42, nxtscholar and retired1 have both given you good advice to inspect rubber, check experimental procedures and wind rubber properly. Reading the info already available on soinc.org is a very good idea. 0.087" thickness Tan Super Sport rubber should make a 17" to 18" two gram motor. This motor...
by bjt4888
January 18th, 2015, 5:19 pm
Forum: Wright Stuff C
Topic: Design
Replies: 178
Views: 35485

Re: Design

nxtscholar, Looking from the front, the covering should be on the right side of the rudder/vertical stabilizer. Although it is more typical to describe "sides" of an airplane as if you are sitting in it and flying it as if it were a full scale airplane. If I were sitting in the Freedom Flight kit ai...
by bjt4888
January 18th, 2015, 5:14 pm
Forum: Wright Stuff C
Topic: Circular
Replies: 25
Views: 6956

Re: Circular

torqueburner, One possibility would be that the motor you are using cannot operate the higher pitch propeller well enough to create the airspeed necessary for the tailboom offset or the stabilizer tilt to create adequate turn. We had this exact result as propeller pitch was increased or when substit...
by bjt4888
January 17th, 2015, 6:45 pm
Forum: Wright Stuff C
Topic: Winding
Replies: 24
Views: 9055

Re: Winding

Chris_L, nxtscholar's information is good and he or she should be congratulated for compiling a good set of data and analyzing. Other factors that will affect the rubber thickness and corresponding rubber motor loop length that gives best duration include: propeller pitch, propeller blade area, airp...
by bjt4888
January 16th, 2015, 9:44 am
Forum: Wright Stuff C
Topic: Circular
Replies: 25
Views: 6956

Re: Circular

artysophia, Congrats on constructing a great airplane! If you could please supply more data, I could answer your question. For example: what thickness and length is your rubber motor, how many turns are you putting in it (what are you lubricating it with), are you backing off any turns on the rubber...
by bjt4888
January 13th, 2015, 4:31 pm
Forum: 2015 Build Events
Topic: Elastic Launched Glider B
Replies: 134
Views: 34366

Re: Elastic Launched Glider B

torqueburner, Congrats on building the Stan Buddenbohm Litt'l Sweep glider. The high schools that I have coached for the last couple of years also used this glider as their initial experience and got excellent results with it. I have built a few of these myself for testing purposes and all have trim...
by bjt4888
January 11th, 2015, 6:36 pm
Forum: Wright Stuff C
Topic: Winding
Replies: 24
Views: 9055

Re: Winding

torqueburner, Congratulations on your thorough testing of winding technique. Sounds like you're getting some great data. I'm assuming that you saw Jeff Anderson's correction of my comment about winding quickly to deal with the 8-minute window. Jeff reminded us that the 8-minute window starts with th...
by bjt4888
January 4th, 2015, 9:17 am
Forum: Wright Stuff C
Topic: design rules?
Replies: 7
Views: 4786

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: 35485

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...

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