Search found 10938 matches

by Mark
Thu Mar 14, 2024 1:49 am
Forum: Off topic forum
Topic: youtube
Replies: 1510
Views: 537162

Re: youtube

Airborne 03.13.24: We Fly Deltahawk!, Kite Magnetics eTrainer, Pulsejet!
https://www.youtube.com/watch?v=Aoj61D06MGU&t=567s

https://wave-engine.com/
by Mark
Thu Mar 07, 2024 3:42 pm
Forum: Off topic forum
Topic: youtube
Replies: 1510
Views: 537162

Re: youtube

Quite a bit of spring energy as it jumps out of the beaker Thick nitinol wire tossed in hot water, breaks glass beaker. https://www.youtube.com/watch?v=MuhwiPzlcCw I just tried the above demo with 1mm thick nitinol wire,1 meter long wound into a ~3/4 inch diameter spring about 2 inches long and dro...
by Mark
Sun Mar 03, 2024 7:14 pm
Forum: Off topic forum
Topic: youtube
Replies: 1510
Views: 537162

Re: youtube

"Oh, that's really weird ... Can you hear that?"

How NASA Reinvented the Wheel
https://www.youtube.com/watch?v=vSNtifE0Z2Q&t=900s
by Mark
Sun Mar 03, 2024 7:14 pm
Forum: Off topic forum
Topic: youtube
Replies: 1510
Views: 537162

Re: youtube

"Oh, that's really weird ... Can you hear that?"

How NASA Reinvented the Wheel
https://www.youtube.com/watch?v=vSNtifE0Z2Q&t=900s
by Mark
Thu Feb 29, 2024 1:44 pm
Forum: Ramjet forum
Topic: Ryan's Marquardt Firebrand drone
Replies: 1
Views: 110

Re: Ryan's Marquardt Firebrand drone

by Mark
Sun Feb 25, 2024 5:01 pm
Forum: Off topic forum
Topic: youtube
Replies: 1510
Views: 537162

Re: youtube

Quite a bit of spring energy as it jumps out of the beaker
Thick nitinol wire tossed in hot water, breaks glass beaker.
https://www.youtube.com/watch?v=MuhwiPzlcCw
by Mark
Sat Feb 24, 2024 3:58 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 812607

Re: Odds and ends

Some out of focus perspective showing the angle and movement of the rolling with a fixed point. The other day it ran for almost 9 minutes and could do better if it had a flat even surface for it to roll over.
Wheel Motor Pivoting on a Point
https://www.youtube.com/watch?v=9DG4FdhXGJw
by Mark
Fri Feb 23, 2024 3:45 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 812607

Re: Odds and ends

My little rolling wheel motor towel bar posts are made of chrome-plated brass. So I wonder how a nitinol wheel would perform. From Wikipedia "The discovery of the shape-memory effect in general dates back to 1932, when Swedish chemist Arne Ölander[6] first observed the property in gold–cadmium alloy...
by Mark
Thu Feb 22, 2024 7:59 pm
Forum: Off topic forum
Topic: youtube
Replies: 1510
Views: 537162

Re: youtube

Just a funny design Shape Memory Motor Prototype Test https://www.youtube.com/watch?v=JAbjJY-6Ts4&list=PLdlO2o-tWpQvdZPJMJ9E_7My_VDfgAy7W A faster one Very strong Nitinol Engine running on warm water and ice https://www.youtube.com/watch?v=sscoMtJV0uY&list=PLdlO2o-tWpQvdZPJMJ9E_7My_VDfgAy7W&index=3 ...
by Mark
Thu Feb 22, 2024 1:51 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 812607

Re: Odds and ends

Yes. I've bought several shapes myself because they just seemed like something potentially useful later on somehow. Here's yet another variation of the wheel motor. A center needle point stays fixed in one spot and the wheel tilts on the pivot point going in circles. I was thinking of trying a swash...
by Mark
Tue Feb 20, 2024 2:00 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 812607

Re: Odds and ends

I kind of like this twirling effect, like something you would spin on the tip of your finger with motion.
Compound Rocking Motion Using Two Cones
https://www.youtube.com/watch?v=Kk9-ocp1Nx4
by Mark
Sat Feb 17, 2024 8:35 pm
Forum: Off topic forum
Topic: Left field
Replies: 600
Views: 222228

Re: Left field

I saw this exact desk model for sale on ebay today for $1800.00. https://chadslattery.com/X-Plane-Models/113 https://www.bonhams.com/auction/29359/lot/152/globe-aircraft-model-22-goblin-contractors-concept-model-mixed-material-on-wood-base-late-1940s-wingspan-7-14-inches-fuselage-8-34-inches-7-14-in...
by Mark
Mon Feb 12, 2024 8:49 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 812607

Re: Odds and ends

I came across this video today by accident, it having some pertinent subject matter starting here. If you turn up the volume you can hear the brass ball chatter or vibrate a bit. PIEZOELEMENT THE SIMPLEST ELECTRICITY GENERATOR Piezoelectric Generator IGOR BELETSKY https://www.youtube.com/watch?v=Kwy...
by Mark
Mon Feb 12, 2024 12:53 am
Forum: Off topic forum
Topic: youtube
Replies: 1510
Views: 537162

Re: youtube

Interesting ending to the story
Why It Was Almost Impossible to Make the Blue LED
https://www.youtube.com/watch?v=AF8d72mA41M
by Mark
Sun Feb 11, 2024 6:31 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1850
Views: 812607

Re: Odds and ends

Some experiments but not much else. I guess it's a lot of weight to move unless perfected.

Test of a Two Inch Single Ball Bearing Motor
https://www.youtube.com/watch?v=Fxxp-VkKqsY
Large Ball Bearing Motion from Heat
https://www.youtube.com/watch?v=79Jl0g4Gz5Q