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by bjt4888
February 16th, 2015, 11:17 am
Forum: Wright Stuff C
Topic: Design
Replies: 178
Views: 36615

Re: Design

Sorry. Here's the link to the video referenced in my post above. I also see that I have a couple of typos. Obviously, I'm gluing the blade to the prop spar, etc. Sorry about that. Typing too fast.

Bjt4888

https://vimeo.com/68616979
by bjt4888
February 16th, 2015, 9:21 am
Forum: Wright Stuff C
Topic: Design
Replies: 178
Views: 36615

Re: Design

Here is an excellent video of AMA Penny Plane construction. I believe that this has been posted on the SO forum previously. Several steps demonstrated in the video are done "free hand" and may be difficult for a novice. However, the concepts and demonstration are very good and a few additional piece...
by bjt4888
February 15th, 2015, 3:36 pm
Forum: 2015 Build Events
Topic: Elastic Launched Glider B
Replies: 134
Views: 35215

Re: Elastic Launched Glider B

bernard, Fuselage flexing will result in erratic fast direction change. Transition issues, if not related to parts flexing, are often an issue of decalage. If nosing over, add 0.5 degree of wing incidence (if you have an incidence adjustable wing mount). SO Coach, See the posts at this link. Read al...
by bjt4888
February 14th, 2015, 6:33 pm
Forum: 2015 Build Events
Topic: Elastic Launched Glider B
Replies: 134
Views: 35215

Re: Elastic Launched Glider B

bernard, Good job of documenting your current glider. It appears that the pylon that attaches the wing to the fuselage is not very substantial. This is an area that you want to be quite rigid so that the wing does not flex or change incidence angle too much during launch. Also, I'm not sure why you ...
by bjt4888
February 14th, 2015, 2:30 pm
Forum: 2015 Build Events
Topic: Elastic Launched Glider B
Replies: 134
Views: 35215

Re: Elastic Launched Glider B

bernard, Nosediving on launch is usually caused by inadequate decalage angle. It is odd that adding ballast to the nose corrected this. Please supply much more information so that I can help you better. Example: what design are you building? What is the amount of flap droop? What are the flaps made ...
by bjt4888
February 11th, 2015, 9:50 am
Forum: Wright Stuff C
Topic: Design
Replies: 178
Views: 36615

Re: Design

nxtscholar, You did an excellent job researching the web to find this INAV issue. I has good info on bucket props. Jeff, Would it be within the scope of this wiki for me to post a sample simplified solution to the bucket prop development problem using the Fred Rasch spreadsheet and a couple of pictu...
by bjt4888
February 9th, 2015, 4:49 pm
Forum: 2015 Build Events
Topic: Elastic Launched Glider B
Replies: 134
Views: 35215

Re: Elastic Launched Glider B

drcubbin wrote: I saw on one of the Launched Glider videos that an "accelerant" is used to dry the CA glue much more quickly. Does anyone know where I can buy that (without having to order and wait since we are in a bit of a rush?) I thought they said it is sold at Walmart, but I couldn't find it th...
by bjt4888
February 7th, 2015, 1:06 pm
Forum: Wright Stuff C
Topic: Design
Replies: 178
Views: 36615

Re: Design

InfiniCuber, If your only basic change was a new wing, which resulted in extreme stalling and right turn instead of left, your issue is most likely with your wing. I would suspect too much incidence (LE higher than TE). Many of these airplanes will fly well with less than 1.5 degrees of total decala...
by bjt4888
February 2nd, 2015, 5:03 pm
Forum: Wright Stuff C
Topic: Design
Replies: 178
Views: 36615

Re: Design

DoctaDave wrote: Well for the leading and trailing edges found in the Freedom Flight kit, they use a very thin, tapered, triangular strip of balsa but I can't seem to find the same type of wood in any hobby shop or website. I've only found balsa leading and trailing edges that are 1/4"x1" at the sma...
by bjt4888
February 2nd, 2015, 4:53 pm
Forum: Wright Stuff C
Topic: Design
Replies: 178
Views: 36615

Re: Design

nxtscholar, Attached are pictures of the Harlan prop hanger/"pigtail thrust bearing" and custom prop hook and rear hook that my students are using. Both hooks are made from .018" guitar string. The Harlan prop hanger/"pigtail thrust bearing" shown is the Penny Plane bearing. This bearing needs to be...

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