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by bjt4888
November 10th, 2019, 8:02 pm
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 296
Views: 18693

Re: Wright Stuff C

...removable shim either under the bottom edge of the front of the wing mount wood strip or the bottom edge of the back of the wing mount wood strip...
by bjt4888
November 10th, 2019, 6:57 pm
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 296
Views: 18693

Re: Wright Stuff C

Are you verifying the CG with the motor installed per page 14 of the instructions? Is it 1.8” forward of the wing TE? Be sure as this year’s design is extremely sensitive to CG placement. 1/8” off will cause poor flying. Washin is the slight “wing warp” referred to on page 15 of the instructions. Th...
by bjt4888
November 10th, 2019, 5:59 pm
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 296
Views: 18693

Re: Wright Stuff C

Xiangyu, Congrats on building the biplane. Did you have the following all exactly per plan: CG, wing incidence and wing washin? Did you install the carbon diagonal struts connecting the wing LE and TE to the wing posts exactly per the plan? If not, what does each of these specs measure and what is y...
by bjt4888
November 8th, 2019, 5:31 pm
Forum: Elastic Launched Glider B
Topic: Elastic Launched Glider B
Replies: 49
Views: 2670

Re: Elastic Launched Glider B

New, If you are building the Freedom Flight kit, I think that the foam is Graupner Vector Board, which can be glued with CA. Glueing recommendations should be in the very thorough instructions. Yes, epoxy can be used to glue most foam to wood joints, however, I do not have experience with Vector Boa...
by bjt4888
November 7th, 2019, 6:58 pm
Forum: Elastic Launched Glider B
Topic: Elastic Launched Glider B
Replies: 49
Views: 2670

Re: Elastic Launched Glider B

New,

See my reply to Nathan regarding glue about 12 posts back in this thread.

Brian T
by bjt4888
November 7th, 2019, 10:32 am
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 296
Views: 18693

Re: Wright Stuff C

Patrick, https://www.hach.com/ptfe-tubing-020-interior-diameter-x-0625-outside-diameter/product?id=7640378806&callback=qs This tubing is sold by the foot and is a little small in inside diameter (exactly .020”). You can ream out the inside with a .022” or .024” drill bit and then slice 1/32” thick o...
by bjt4888
November 6th, 2019, 3:27 pm
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 296
Views: 18693

Re: Wright Stuff C

Patrick, Congrats on planning your own propellers. Ikara prop hangars and nose bearings are workable and successful airplanes use them. That being said, my teams use the Harlan bearing. This bearing has built in 1/4” stick clearance for the motor and is Probably a lower shaft friction coupling. We u...
by bjt4888
November 3rd, 2019, 6:42 am
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 296
Views: 18693

Re: Wright Stuff C

Eric, Congrats again for your results to date and for the contribution to the forum. With reference to your response about induced roll to control initial climb rate, you probably already know this, but the three methods I mentioned in my above posting are listed in the order my teams would approach...
by bjt4888
November 3rd, 2019, 6:29 am
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 296
Views: 18693

Re: Wright Stuff C

Ginaje, The teams that I coach (and other top teams) approach Wright Stuff partly as a materials engineering project. The density, weight, cross section and stiffness of ever balsa wood and carbon part is evaluated carefully and selected to provide adequate stiffness and to achieve correct CG and ov...
by bjt4888
October 29th, 2019, 11:33 am
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 296
Views: 18693

Re: Wright Stuff C

partly not “party”. Hard to keep up with crazy auto correct.

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