Search found 562 matches

RETURN_TO_SEARCH_ADV

by bjt4888
February 25th, 2014, 6:06 pm
Forum: 2014 Build Events
Topic: Helicopters B
Replies: 180
Views: 27151

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...
by bjt4888
February 24th, 2014, 8:59 am
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 30968

Re: Elastic Launched Glider C

About a week ago, I posted a plan and some construction notes for a basic flapper style glider that meets the 2014 SO rules on the Hip Pocket Aeronautics Builders Plan Gallery. The plan is called "Flapper SO 2014 CLG". Also posted under the "Science Olympiad" subject on the Hip Pocket Aero site are ...
by bjt4888
February 20th, 2014, 9:03 am
Forum: 2014 Build Events
Topic: Helicopters B
Replies: 180
Views: 27151

Re: Helicopters B

I am judging this event at a local invitational tournament this weekend and am wondering if the experienced competitors or coaches among you could answer a couple of questions. First, I'm wondering what is the typical device used to judge rotor span. I have a couple of ideas based upon my experience...
by bjt4888
February 12th, 2014, 3:46 pm
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 30968

Re: Elastic Launched Glider C

I would like to thank calgoddard for clarifying my response regarding aspect ratio. I agree that my post relates to low ceiling gliders. And, of course, my mention of lightweight rubber classes like Limited Pennyplane was with regards to aspect ratio design analysis only. This does not mean that I w...
by bjt4888
February 8th, 2014, 8:58 am
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 30968

Re: Elastic Launched Glider C

smithy0013, Reducing aspect ratio is a common design idea used to increase performance in span limited model airplane classes with weight minimums. This was not so much a factor last year as there was no weight minimum. AMA CLG classes have a required maximum chord of 3", but SO does not. Increased ...
by bjt4888
February 7th, 2014, 10:19 am
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 30968

Re: Elastic Launched Glider C

Reply to Goswal, See the Canard Design Calculator link I posted in a message on page 3 of this forum. If the center of gravity of your glider is properly located relative to the neutral point (do you have enough clay on the nose and not too much), your issue is probably inadequate positive foreplane...
by bjt4888
January 1st, 2014, 1:22 pm
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 30968

Re: Elastic Launched Glider C

Fanjiatian, Composite Structures Technology webstore is a reliable supplier of 1k carbon tow. The cost of this carbon material is quite low at about $20 for a 300' roll. Unfortunately, shipping cost is a little high for small orders. There is a very good description of the process of attaching carbo...
by bjt4888
December 27th, 2013, 9:28 am
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 30968

Re: Elastic Launched Glider C

The teams that I am coaching are using the Littl Sweep glider and, yes, it is adapted for the 2014 28cm wing span. The 3 gram minimum weight is also not an issue as the kits we have received will produce glider between 3.2 and 4.2 grams. The lightest copies of this glider are capable of "on pattern"...
by bjt4888
December 21st, 2013, 5:36 pm
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 30968

Re: Elastic Launched Glider C

Dear Toast, Here are some helpful links for canard design: Canard design calculator http://adamone.rchomepage.com/cg_canard.htm Interesting discussion on the RCGroups.com forum “Canard Forum” http://www.rcgroups.com/forums/showthread.php?t=613556&page=114 There is also an interesting discussion of "...
by bjt4888
December 6th, 2013, 5:54 pm
Forum: 2014 Build Events
Topic: Elastic Launched Glider C
Replies: 157
Views: 30968

Re: Elastic Launched Glider C

Bizzle, It is possible that your flap material is too stiff. I have found that thin .032" foam needs to be sanded on both sides to .025". See construction notes on the hip pocket aeronautics website for the WIF7. Bjt4888 AMA member since 1972 (off and on) NFFS member for many years (also off and on)

RETURN_TO_SEARCH_ADV