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by bjt4888
January 9th, 2020, 8:40 am
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 705
Views: 50163

Re: Wright Stuff C

All, Gearbox by master indoor modeler, Ray Harlan (of Harlan prop hanger fame; same person). See Pictures in Reply #9 of this thread. The pictured gearbox is for electric indoor FF, but could be reversed, as Aircoco did, for rubber power. https://www.hippocketaeronautics.com/hpa_forum/index.php?topi...
by bjt4888
January 8th, 2020, 3:53 pm
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 705
Views: 50163

Re: Wright Stuff C

A two gram loop of .125 should be taking around 1250 turns on the first wind going up to about 1.9. After 1 or 2 flights, maybe around 1350+ A higher prewind will give you more intial turns, and hopefully you don't have to dewind as much. I've known quite a few to push .125 above 2.0 torque (I've g...
by bjt4888
January 8th, 2020, 3:00 pm
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 705
Views: 50163

Re: Wright Stuff C

Air, Since a 2 gram loop of .125” rubber takes about 1,100 turns when wound to about 1.2 in oz and maybe less if this is a first winding; maybe 900 to 1,000. And from 1.2 to 0.6 in oz would be about 50 to 75 backoff turns and assuming landing with a small number of turns remaining; maybe another 50;...
by bjt4888
January 8th, 2020, 1:01 pm
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 705
Views: 50163

Re: Wright Stuff C

Air, Yes, I agree with Jeff. I didn’t mean to discourage your work on gearboxes. Just want to advise you to get clarification and to consider that one of the most difficult parts of gearbox construction is the housing which aligns the gears and shafts. It’s possible that a premanufactured housing mi...
by bjt4888
January 8th, 2020, 5:20 am
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 705
Views: 50163

Re: Wright Stuff C

Air, I want to compliment your ingenuity and effort on the gearbox, but you might want to consider the “purchase preassembled” wording in the rules related to the propeller assembly. The rules appear to only allow a few elements to be purchased preassembled, including: propeller, shaft, hanger and/o...
by bjt4888
January 7th, 2020, 5:44 pm
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 705
Views: 50163

Re: Wright Stuff C

So I finally got some gym time. I know everyone has said a gearbox is a waste of time but I'm kind of intrigued by the idea. So I built a concept plane to test the gearbox. I put the link to a video of the first flight. I started it late since I had to launch then record. It went for 59 seconds. ht...
by bjt4888
January 6th, 2020, 5:27 pm
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 705
Views: 50163

Re: Wright Stuff C

We dislodge stuck airplanes from the ceiling with a 35 ft. extendable fiberglass pole. Never lost an airplane. Sometimes get some small damage dislodging, but always repairable. Brian T Brian Where do you get a pole like that? Air coco, This is the pole I have. Sorry, I remembered incorrectly it is...
by bjt4888
January 5th, 2020, 6:40 pm
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 705
Views: 50163

Re: Wright Stuff C

We had a good day today! We've come to terms with the fact that we have one design good for 25'+ ceilings (wings centered so the plane banks, which controls the climb), and another design for ceilings above 50' (wings offset either way so no banking, more efficient climb). The second design would o...
by bjt4888
January 3rd, 2020, 11:11 am
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 705
Views: 50163

Re: Wright Stuff C

Do I need to make any modifications to the bernie hunt design spreadsheet in order for it to apply to science olympiad planes and/or biplanes? If so, what modifications? Thanks Pasch, Yes, since SO airplanes are significantly heavier than those that the spreadsheet was designed for, you'll find tha...
by bjt4888
December 21st, 2019, 8:17 pm
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 705
Views: 50163

Re: Wright Stuff C

EDIT: I'm looking at my wings again and I've noticed that some are warped not due to the placement, but due to curvatures in the carbon fiber rods. Does anyone have suggestions on how to straighten carbon fiber rods? Xiangyu We use carbon from CST, and have not had issue with curvature. I understan...

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