Search found 89 matches

by HandsFreeCookieDunk
January 14th, 2017, 7:41 am
Forum: 2017 Lab Events
Topic: Hovercraft B/C
Replies: 906
Views: 136748

Re: Hovercraft B/C

So.... I'm pretty sure most people will think this is a stupid question, but the rules specify the dowel's height "above the lowest vehicle surface". Isn't the lowest surface of the vehicle the part that runs on the track? (In which case why didn't they just say above the track?) I know that sounds...
by HandsFreeCookieDunk
January 13th, 2017, 5:18 pm
Forum: 2017 Lab Events
Topic: Hovercraft B/C
Replies: 906
Views: 136748

Re: Hovercraft B/C

So.... I'm pretty sure most people will think this is a stupid question, but the rules specify the dowel's height "above the lowest vehicle surface". Isn't the lowest surface of the vehicle the part that runs on the track? (In which case why didn't they just say above the track?) I know that sounds ...
by HandsFreeCookieDunk
January 13th, 2017, 4:53 am
Forum: 2017 Lab Events
Topic: Hovercraft B/C
Replies: 906
Views: 136748

Re: Hovercraft B/C

I have a bit of a dumb question.... I assume that we don't have to protect the underside of the hovercraft from people trying to probe the "lift fan" from underneath inside its skirt, just anything that is exposed on top of the hovercraft? Cheers, Andrew Not a dumb question at all, since I think th...
by HandsFreeCookieDunk
January 13th, 2017, 4:44 am
Forum: Towers B/C
Topic: Towers B/C
Replies: 745
Views: 103914

Re: Towers B/C

In discussions about bracing, almost all of the methods I’ve seen involve placing a piece of balsa between the two legs, connected by butt joints. Really? I've never seen a tower made with anything other than lap joints attached on the outside. HandsFreeCookieDunk, such bracing, if I'm understandin...
by HandsFreeCookieDunk
January 12th, 2017, 5:54 pm
Forum: Towers B/C
Topic: Towers B/C
Replies: 745
Views: 103914

Re: Towers B/C

In discussions about bracing, almost all of the methods I’ve seen involve placing a piece of balsa between the two legs, connected by butt joints. Does anyone has any tips on how to cut the stick so that so that it fits perfectly? I’ve had some difficulty creating a brace that is not only the perfec...
by HandsFreeCookieDunk
January 9th, 2017, 7:29 am
Forum: 2017 Lab Events
Topic: Hovercraft B/C
Replies: 906
Views: 136748

Re: Hovercraft B/C

Considering that no one has asked this yet, what scores have y'all gotten when testing your hovercrafts? I think it's hard to tell because of the mass score. It depends on the heaviest device at the competition, so people's scores will vary. At a very competitive competition, someone might have a l...
by HandsFreeCookieDunk
January 6th, 2017, 8:48 am
Forum: 2017 Lab Events
Topic: Wind Power B/C
Replies: 338
Views: 42169

Re: Wind Power B/C

Has any of you been to an invitational and know of top high and low voltage scores at the event? Please post the resistance used in the setup. Thanks! Unfortunately, that information is kind of useless without knowing the motor as well. The motor itself has a huge effect on the voltage and those re...
by HandsFreeCookieDunk
December 5th, 2016, 6:04 pm
Forum: Towers B/C
Topic: Support
Replies: 10
Views: 1464

Re: Support

Hey what do you think would be the best way to make the legs of the tower stronger without adding too much weight? What do you mean by "make the legs stronger"? The only way to make the leg columns themselves stronger is to use a stronger stick of balsa. Using a stick with a larger cross-section wi...
by HandsFreeCookieDunk
December 1st, 2016, 6:05 am
Forum: 2017 Lab Events
Topic: Hovercraft B/C
Replies: 906
Views: 136748

Re: Hovercraft B/C

I did an estimate by scaling down larger hovercraft propellers and found that you'll need about 50 CFM to go full speed with a 2kg craft. Does this sound reasonable? Very reasonable, but keep in mind our hovercrafts will not be very comparable and youll likely need much more CFM. There is a fan on ...
by HandsFreeCookieDunk
December 1st, 2016, 4:33 am
Forum: 2017 Lab Events
Topic: Hovercraft B/C
Replies: 906
Views: 136748

Re: Hovercraft B/C

I did an estimate by scaling down larger hovercraft propellers and found that you'll need about 50 CFM to go full speed with a 2kg craft. Does this sound reasonable?

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