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by bjt4888
January 12th, 2020, 6:25 pm
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 558
Views: 37231

Re: Wright Stuff C

Yes, agree with Jeff. Going through a pound already this year was just an exasperated remark on my part. Sorry, not very helpful. Motors are longer this year than in the past and lots of combinations to test with the challenging little propeller and two-direction flying. As difficult as the event is...
by bjt4888
January 12th, 2020, 5:45 pm
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 558
Views: 37231

Re: Wright Stuff C

6-8 practice flights per motor if not pushing the winds too hard. Number of turns on a particular length and density rubber motor can be determined pretty accurately using the John Barker equation that I have previously published in the Scioly forum and that Eric has actually found and reposted most...
by bjt4888
January 12th, 2020, 4:40 pm
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 558
Views: 37231

Re: Wright Stuff C

For an event where time is unlimited, I think risking breakage is mandatory. Luke knows he's sacrificing 5-10 seconds of flight time by winding conservatively, but he's understandably concerned about launching twice in the allowed time frame and having to deal with an unexpected motor failure. He t...
by bjt4888
January 9th, 2020, 2:45 pm
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 558
Views: 37231

Re: Wright Stuff C

Air, Yes, molded carbon cloth, probably actually “carbon veil”; ultra thin cloth. Ray is a master craftsman. Did you note the ball bearings for the carbon rod shafts? The airplane pictured holds the AMA Category I (ceiling height of less than 8 meters, or 26.3 ft) national record for FF electric, fl...
by bjt4888
January 9th, 2020, 8:40 am
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 558
Views: 37231

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: 558
Views: 37231

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: 558
Views: 37231

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: 558
Views: 37231

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: 558
Views: 37231

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: 558
Views: 37231

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...

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