sky rangers model flyers radio controlled aircraft club
Google
Web skyrangersmodelflyers.com
Sky Rangers Model Flyers

R/C Aircraft Modeling Articles

Propellor Balancing
 
Author: Bill Cousins

Let's talk a bit about prop balancing. This is very important and your motor will love you for it. It also creates less vibration for your plane and all of your radio components,especially your beloved receiver. It is also very necessary to keep the bearings in your motor intact. The better you balance your prop the smoother things will run. So with that out of the way lets talk about the types of balancers there are.

First of all, there is the hand held balancer {PRATHER PRODUCTS AIRCRAFT BALANCER}. This is shown in { Fig,#1-#2-#3 } ,this little fellow is good in a pinch especially up at the field, but not truly accurate. There is also the {TOP FLITE MAGNETIC PROP BALANCER - Fig.#4.} This balancer is truly an excellent item, it uses a pointed shaft and magnets on each end of the up-rights and is very accurate. If you notice in { Fig.#4 } I have spacers screwed to the bottom of the balancer so I can balance longer props. If you don't raise it up then it's only good for 12-13 inch props. There is absolutely no friction between the pointed shaft when balancing your prop. The third one to mention is the {DU-BRO TRU-SPIN PROP BALANCER - Fig.#5 }. This is also a very good unit as there are different configerations that you can work with. It can be taken apart and used in different ways, and can balance rotor blades and car wheels etc. It can also sit on the edge of your work bench and balance any size of props that you have in your collection, and that's what is so unique about this unit.

Well, how do we balance a prop?. I think most hobbyists use sand paper { Fig.#6 } to balance and all you do is attach the prop accordingly, hold it parallel and see which way it falls. That will indicate the heavy side. Then just use the sandpaper {Fig.#6 } and on the inside of the prop, sand off a little material at a time until the balance comes out perfect. DO NOT sand the edges of the blades - leave them sharp. I know, they are hard on skin and fingers but if you round the edges the prop won't cut the air properly.

I perfer to use yellow enamel {Fig. #7} to balance a prop. This is just my personal preference. I do this for two reasons; one is it's easier. A prop is shown on either {Fig.#7.4 and Fig.#7.8} prop balancer. All you have to do is paint the tips and just add more coats on the light side until you get it perfect { Fig.8. }. The second reason is that you can see the tips of the prop when the engine is running and that is very pleasing to your finger tips {and skin}. They will thank you for it, believe me.

Fig.#9-#10-#11-#12-#13 show the prop stays at any angle you put it at and that shows a well balanced prop. Fig. #14-#15-#16 show the same prop, but on the Du-bro Tru-spin balancer and it also stays in the positions you put it at. Also it's a good idea to balance the spinner, since you have balanced the prop goes hand in hand.

Install the back plate first Fig.#17; then install the cone Fig.#18 and don't forget the screws Fig. #19. Never balance the spinner without installing the screws. Turn the spinner and see which side is the heaviest. Now you can either paint the inside of the cone or take your Dremel tool and grind off some material where the prop goes. { A very little bit at a time } until it's balanced and you can turn the cone in any direction. Fig.#20 Fig. #21 and Fig. #22. Also never have the prop touch the outer edges of the cone, always have one eigth of an inch clearance between the cone and the prop. You will more than likely have to grind it out to accept the prop anyways.

There are always other ways to balance props and I have just discussed three ways. Hobbyist's out there might have better ways to do it and that's great too. This article is just my opinion and hopefully you will find it helpful. Just remember, prop balancing is one of the most important items to do before you go flying and always - SAFETY FIRST!!! Never rush when you're at the field and KEEP THOSE HANDS AWAY FROM THAT PROP!!!!.
 

click to enlarge

Fig. #01 Prather Products Hand Held Prop Balancer
click to enlarge

Fig. #02 Another View
click to enlarge

Fig. #03 Hand Held Prop Balancer With Prop
click to enlarge

Fig. #04 Top-Flight Magnetic Prop Balancer
click to enlarge

Fig. #05 Du-Bro Tru-Spin Prop Balancer. {Excellent For Big Props}
click to enlarge

Fig. #06 Sand Paper Foe Sanding Inside Of Prop
click to enlarge

Fig. #07 Yellow Enamel Paint
click to enlarge

Fig. #07.4 Top-Flite Balancer With Prop
click to enlarge

Fig. #07.8 Tru-Spin Balancer With Prop
click to enlarge

Fig. #08 Prop With Yellow Tips That Is Balanced
click to enlarge

Fig. #09 Perfectly Balanced Prop Should Stay In Any Position
click to enlarge

Fig. #10 Same Prop But With The Du-Bro Tru-Spin Prop Balancer
click to enlarge

Fig. #11 Balanced It Stays In This Positoin
click to enlarge

Fig. #12 Should Not Move
click to enlarge

Fig. #13 This Is Perfectly Balanced
click to enlarge

Fig. #14 Same Prop But With The Tru-Spin Balancer
click to enlarge

Fig. #15 Still Stays In One Position.
click to enlarge

Fig. #16 Even On An Angle
click to enlarge

Fig. #17 Install Back Plate onto Prop Balancer
click to enlarge

Fig. #18 Install Nose Cone onto Back Plate
click to enlarge

Fig. #19 Don't Forget to Install the Screws Before Balancing
click to enlarge

Fig. #20 When Finished should Balance in any Position
click to enlarge

Fig. #21 Balanced in any Position
click to enlarge

Fig. #22 Yet Another Example

Support The Sky Rangers By Visiting Other Great R/C Sites!

 

Copyright © 2004 Sky Rangers Model Flyers
Email:

Radio Control Modeling Webring
Radio Control Modeling Webring
 
[ Join Now | Ring Hub | Random | << Prev | Next >> ]
 
THEFT ALERT!!!
Please help find this airplane!
Click here to
learn more!
 
SUPPORT US
Check out these other great R/C web sites and in doing so you'll be supporting the sky rangers model flyers.
 
 
CHECK THIS OUT
Interested in making money from your web site? Click the image below to find out how we do it for our Sky Rangers Club Web Site...
 
 
 
MORE RESOURCES
Gas-Powered R/C Planes
Check out this excellent selection of gas-powered airplanes.
Electric R/C Planes
A valuable resource for the electric r/c plane enthusiast.
R/C Plane Radios
Looking for a radio? Check out this wide selection of radios.