Search found 1678 matches

by illusionist
March 27th, 2010, 5:41 pm
Forum: 2010 Lab Events
Topic: Physics Lab B/C
Replies: 424
Views: 49750

Re: Physics Lab B/C

We have consistently been getting 1200 mv, but when we tested it today, it went down to 700 mv. We tested 5 different turbines, and all of them went down about 300 mv... We thought the multimeter battery was low, so we replaced the battery, but the results were still 200 mv lower... Any suggestions...
by illusionist
March 27th, 2010, 2:32 am
Forum: 2010 Lab Events
Topic: Physics Lab B/C
Replies: 424
Views: 49750

Re: Physics Lab B/C

Not likely for a motor to go bad - motors are burned out if too much current is passed through the coils, causing them to heat up and short through the insulation. I don't think that's likely at the speeds of the turbine. If you used an ohmmeter to measure the motor's resistance before you could co...
by illusionist
March 26th, 2010, 5:45 pm
Forum: 2010 Lab Events
Topic: Physics Lab B/C
Replies: 424
Views: 49750

Re: Physics Lab B/C

We have consistently been getting 1200 mv, but when we tested it today, it went down to 700 mv. We tested 5 different turbines, and all of them went down about 300 mv... We thought the multimeter battery was low, so we replaced the battery, but the results were still 200 mv lower... Any suggestions...
by illusionist
March 26th, 2010, 5:10 pm
Forum: 2010 Lab Events
Topic: Physics Lab B/C
Replies: 424
Views: 49750

Re: Physics Lab B/C

We have consistently been getting 1200 mv, but when we tested it today, it went down to 700 mv. We tested 5 different turbines, and all of them went down about 300 mv... We thought the multimeter battery was low, so we replaced the battery, but the results were still 200 mv lower... Any suggestions ...
by illusionist
March 25th, 2010, 3:12 pm
Forum: 2010 Lab Events
Topic: Physics Lab B/C
Replies: 424
Views: 49750

Re: Physics Lab B/C

Littleboy wrote:How well do 2 bladed ones do?
based on my testing, they tend to be more efficient than the 3-bladed designs...
by illusionist
March 24th, 2010, 2:04 pm
Forum: Wright Stuff B
Topic: Flight Times
Replies: 175
Views: 24397

Re: Flight Times

Quick question, how should I adjust the center of gravity? Adding wire or other mass is adding a little too much weight...
by illusionist
March 24th, 2010, 2:00 pm
Forum: Wright Stuff B
Topic: Flight Trimming
Replies: 79
Views: 18319

Re: Flight Trimming

What is an ideal location for the cg?
by illusionist
March 24th, 2010, 1:50 pm
Forum: Wright Stuff B
Topic: Flight Times
Replies: 175
Views: 24397

Re: Flight Times

Based on my plane that has a 38.5 cm wingspan and 11 cm chord, 19 cm stabilizer span, 6 cm stab chord, 3/32 inch rubber motor, and a 20 cm ikra prop and weighs exactly 7.1 grams. If I increase the area of the stabilizer, will I need to adjust the size of my wing? I know I will have to do some re-tri...
by illusionist
March 22nd, 2010, 12:40 pm
Forum: Wright Stuff B
Topic: Flight Times
Replies: 175
Views: 24397

Re: Flight Times

[quote="jcollier"]IME, .093-.062 would be too drastic of a change. Our planes fly well with .080 to .085 rubber. If you are pressed for time and can't get thinner rubber, you could always decrease the wing incidence (angle of attack) a mm or so and see what that does.[/quote As of right now, I actua...
by illusionist
March 22nd, 2010, 4:11 am
Forum: Wright Stuff B
Topic: Flight Times
Replies: 175
Views: 24397

Re: Flight Times

Alright thanks, I'll let you know after the competition. :) Right now, I get my rubber from aeroracers.com. I'm using the ".093" inch rubber, should I get the ".062" inch?

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