*The manufacture of a propeller for an airplane is somewhat complicated but the balance is essential for it to work very well. My congratulations . Angel.*
Another way to balance prop instead of adding weights is to spray a light coat of spar varnish on back side of light blade for about 1/3 span starting at tip. Blade will move and possibly return slightly as solvent flashes off. So just add a little more spray. If too much is applied, wipe it off with acetone before it dries and start over.
Presumably the balance will be re-checked after the weight if installed and the glue has dried. I used to balance car and truck wheels, and it's obvious that the balance need finally confirming before the prop goes to the customer.
I'm not much of a woodworker, but I found that using a Dowling Jig would cause your drill bit to maintain a perfectly vertical position. I agree with the others about the possible weight problem with the epoxy and wood plug. Have built 3 EAB planes and all of that adds weight.
This is just an example video, not a tutorial! Balance is rechecked after final varnishing so a perfectly vertical hole means nothing and glue and plugs are always taken into consideration. All this is just too obvious and your comment is just not warranted.
I was wondering that too, maybe the wood plug and epoxy are light enough not to effect it. Either that, or he made the lead plug light enough to account for the weight of the wood plug and epoxy. Could be wrong though.
?question the outer diameter of the bearings that the shaft rests on. appears way too small. plus static balance is no equal to dynamic balance. ever sit inside of a helicopter while it brings rotor up to speed, balance at differant dynamics? regards,
Very well put and i get what you saying and doing but what bhupinderparamotor said in his comment is bang on have a look and please reply to him or me please :-) great video by the way 5*
If you are drilling out holes in your prop anyway, like a crazy person, wouldn't it be better to drill out on the heavy side and leave the hole empty, rather than drill out on the light side, and add lead weight to your aircraft? Looks to me like there would be a better way to do this, than compromising the structural integrity of the propellor hub.
No. You always drill on the light side to make sure you only need to drill one hole! You can add a whole lot of weight to that single hole, but if you do the drilling on the heavy side you might have to drill more than one hole. And this is a perfectly safe and the correct way of doing it, always been done like this!
what about checking to see if the glue and wooden plug havent added weight as well as the lead shouldnt you have added these components in the ballancing and when its dry . yanks dont seem to want to see things right through plus they think pitch and diameter are all you need to make a prop and always forget the width of the prop for some one else to figure out and the calculus needed to do so for motor power to width to diameter to pitch then aspect ratio comes last not first as yanks think
CPS: Yeah those yanks know nothing about airplanes. Especially when this is a New Zealand company making the propellers and advising how to balance them.
Hole location is not terrible at all, this is a perfectly good and safe example of static balancing and plug and glue are always taken into consideration when doing the work. Did you consider that this is just an example video? It's not a paid tutorial for ignorant people! And about buying one of their props, what for? I hope you don't have anything to mount it on other than your living room wall, otherwise it would be really scary!
