Now that your Hidden Blade Mechanism is attached to your Bracer, the only thing left to do is affix the ring that activates the blade retracting mechanism, . pulls the lock out of the hole. Start by drilling a small hole in the flat spring close to the end you ground to a point. Next tie a knot in your string and lace it through the hole so that the knot acts as a stopper keeping the string from pulling completely through. Now tie the free end of the string to your ring, you may have to play around to find the proper length for the string so that when you pull your hand back the string pulls up on the spring and releases the blade.
Congratulations, you should now have a working Hidden Blade prop!! To deploy the blade, simply give a flick of your forearm and the blade will slide out and lock in place. to retract the blade, lift your hand to pull the flat spring out of the depression in the blade releasing the lock.
I would keep the dimensions of the plane and use the smaller propeller. The smaller propeller will weigh less, the wing loading will be less, the sinking speed will be less. The propeller will be a bit less efficient, more importantly, will turn faster and will run out the motor turns more quickly. If you are flying indoors, that may not matter much, since you don’t have the altitude to take full advantage of the energy available from the rubber. But once the contest is over, you can put the bigger propeller on for sport flying outside.
For those of our readers, who like your friendly editor, can’t recall where that article we wanted to look up later got filed, here’s a list of the articles published during the past several years. The list will be updated in January of each year to add the articles from the previous year. The date of the issue in which the article was published is shown in the other column. Each issue covers two months, hence the hyphenated month numbers.
Should you wish to download any specific article, simply click on the name of the article and it will be delivered to your desktop in .PDF format, which you will be able to view and/or print using Adobe Acrobat Reader.