Youtube video:
Continuing development of the Electric Toothbrush Aircraft using a high power rechargeable compact motor drive from a budget supermarket electric toothbrush.
Exploring the potential for educational value in getting that running a polystyrene glider kit flying "around the pole" on a tether line. Lessons can include feeling the torque effect then choosing the direction around the circle so the torque effect to maintain the line tension. Other lessons include a micro switch held on by line tension so cutoff happens if the line breaks.
Aiming here for a low cost kit - the motor unit, switches, propeller (and optional micro video camera) can be re-used for each group of learners. The aircraft and some accessories probably need to be new for each group project at a cost of about USD 10
Well performing fixed wing aircraft typically need to have a maximum thrust (weight force) of 25 percent of the weight. The measurements here are 35gram-force for an all up estimated weight of 100g - that includes carrying a micro video camera. So the maths says that this should be a good performer - 35 percent - too good to let loose on free flight - this will need a tether!
Low cost electric toothbrush is "Expert" sold by Countdown Supermarkets here in New Zealand. Cost is NZD 25 which is approx equivalent to USD 18
http://shop.countdown.co.nz/Shop/ProductDetails?stockcode=749862
Propeller is "THO 387" from Acorn Models, Christchurch, New Zealand:
https://www.acornmodels.co.nz/products/aircraft-accessories/propellors-electric-rubber-powered/78684/
The next exciting episode will be the aircraft. So far after checking out a variety of kits, the best value I can find is this one:
http://www.dx.com/p/fx-fx-702-hand-throwing-hand-launch-glider-airplane-toy-w-sticker-white-black-420328
Note that links are working as at 01 Oct 2016 but designs and supply can change quickly.
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