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Offline mfight43  
#1 Posted : Wednesday, September 12, 2018 10:40:27 AM(UTC)
mfight43

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Hey everyone, I thought I would pose this question here since IMAC flyers use carbon fiber props frequently.

I have a Falcon 3-blade CF prop (26-12) that I am trying to balance. What are your techniques to do so? I am using the Dubro balancer and CA drops to change the weight around. But something just seems off with all of this. And its starting to look ugly too. Any video links out there?

I have a lot to learn and improve in this hobby still.
Offline tl3  
#2 Posted : Wednesday, September 12, 2018 10:59:21 AM(UTC)
tl3

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Get yourself a Vess Balance Ring. You'll never mess with CA and velcro trying to balance a prop again. Also, make sure you're balancing the entire rotating mass assembly together: prop and spinner, with the bolts.
http://www.vesspropellers.com/vess-balance-rings/
Offline Steve Stanton  
#3 Posted : Wednesday, September 12, 2018 11:29:36 AM(UTC)
Steve Stanton

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I'm sure Ty's advice is good however, try as I did, I could not get a three blade prop to balance with the Vess
balance ring. If you look close, you will see the spots on the Falcon props where they have balanced them.
If you feel that isn't good enough, you might want to try using small pieces of masking tape to achieve a closer
balance. After your satisfied with the balance, then use something more permanent to replace the tape.
I've always used a tiny piece of Velcro placed near the hub. You can then drip CA into the Velcro if needed.
Another method I have used is to use a clear coat of dope on the back side of the prop out toward the tips.
Apply cautiously. It doesn't take much.
Offline Earle Andrews  
#4 Posted : Wednesday, September 12, 2018 4:00:11 PM(UTC)
Earle Andrews

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To get an accurate balance you also need the heavy duty Vess balance shaft. The one supplied with the Dubro balancer has too much flex for our large prop/spinner combos.

I found most good CF props (Falcon and Mej) to be very nearly perfect from the factory. Also Tru-Turn spinners are pretty damned close, if not perfect. Once you get into CF/FG spinners all bets are off. They may easily require way more weight than the Vess BR can add. That's where the Velcro/CA comes in hand.....on the INSIDE of the spinner cone. You can also add washer(s) beneath your prop bolt heads for additional weight in that location.

Once you get it where you wish......mark the prop, balance ring, spinner and backplate for proper orientation should you need to remove it and put it back. A photo or drawing of the screws added on the balance ring is needed as well. By marking and noting all of that you can have 2 (or more) prop/spinner combos ready to go if a change is needed.
Offline mfight43  
#5 Posted : Thursday, September 13, 2018 8:53:02 AM(UTC)
mfight43

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Thanks for the advice everyone, I have ordered the Vess balancer. I'll give it a try and use the velcro/ca method along with it if needed. I have all the factors involved, CF spinner custom painted, painted CF prop too. It'll probably take some work.
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