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Balancing Mejzlik Props?

Old 07-26-2007, 07:05 PM
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sillyness
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Default Balancing Mejzlik Props?

OK... I finally came out of the stone age. I was trying to stick with wood, but I got a Mej 30x12 for my new WH Extra and I fell in love. Now I also have a 32x10 as a back-up and a 28x10 for my Panzl.

1 was spot on balance out of the box (30x12)
1 needed a slight hub balancing (28x10)
1 needs a slight hub balancing and a slight span balance (32x10)

All in all... the best balanced props I've ever had.

I balanced the hubs using the DOD method, works great.

I temp balanced the span of the 32x10 with a small piece of scotch tape so I could do the hub balance. Now, how to I balance the span permanantly?
-Can I leave the tape on the tip?
-Should I use varnish? (what kind?)
-Any better ideas?

I REALLY don't want to sand this beautiful prop!!!

Thanks,
me
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Old 07-26-2007, 07:15 PM
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Default RE: Balancing Mejzlik Props?

Go buy a can of Helmsman Spar Urethane from Home Depot or Lowes and spray on one coat at a time until you achieve the correct tip balance. BTW, the spar urethane comes in gloss or satin finish to match the existing finish on the prop. Hope that helps.
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Old 07-26-2007, 07:54 PM
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Default RE: Balancing Mejzlik Props?

Leave the tape...
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Old 07-26-2007, 08:16 PM
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Default RE: Balancing Mejzlik Props?

I use 30 minutes epoxy to balance the hub (hidden by the spinner) and clear paint spray can to balance the blades.
The only propa really balanced are Biela.
Daniel
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Old 07-26-2007, 09:34 PM
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Default RE: Balancing Mejzlik Props?

also sand or spray the back of the prop. most folks won't see it
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Old 07-26-2007, 10:13 PM
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Default RE: Balancing Mejzlik Props?

I use clear Luster coat on the light tip. Works great. The hub is either 5 minute epoxy or the DOD method of velcro strip soaked with thick CA (velcro sticky side is CA'd onto hub).
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Old 07-26-2007, 10:35 PM
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Default RE: Balancing Mejzlik Props?

Hey Me,

I think you already know not to be sanding on a carbon prop so I won't go there.

Another me.
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Old 07-26-2007, 10:48 PM
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Default RE: Balancing Mejzlik Props?

good deal welcome to the world of carbon
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Old 07-26-2007, 10:50 PM
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Default RE: Balancing Mejzlik Props?

I use CA and kicker at the tip when balancing. I use screws at the hub.

Ryan
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Old 07-26-2007, 11:45 PM
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Default RE: Balancing Mejzlik Props?

I stopped using Mejzlik along with several other pilots at my club. The last three I had took way too much work to get them balanced. The third was so bad it was unusable. Many of us have switched to Bolly wood props and they seem to be much better and require little or no work to get them balanced.

I use automotive clear coat on the front of the blade to balance the tips, and the same on the hub if needed. You should never sand on the back of the blade. It is too easy to change the pitch.
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Old 07-27-2007, 08:53 AM
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Default RE: Balancing Mejzlik Props?

I have checked quite a few Mejzlik props. All props I checked are quite closely blade balanced. For perfection, a light rub of spar varnish on one tip will do on the ones a bit off. Unbalance never was more than placing a small folded over snippet of paper on one blade
Some did need some hub balancing. I drill a small hole, and punch in one pellet of lead shot, sealed with a dab of cyano acrylate. Practically invisible. (I used to use a screw, but that is ugly on such beautiful props)
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Old 07-27-2007, 09:24 AM
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Default RE: Balancing Mejzlik Props?

which balancer are you all using for the big props... I have a TF balancer but it is waaaay too small for my 32" props.....
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Old 07-27-2007, 09:52 AM
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Default RE: Balancing Mejzlik Props?

I use the Dubro for the big props.

http://www2.towerhobbies.com/cgi-bin...&I=LXD712&P=ML
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Old 07-27-2007, 09:56 AM
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Default RE: Balancing Mejzlik Props?

i like the one that show on D O D .com site dow n on the dec k
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Old 07-27-2007, 10:00 AM
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Default RE: Balancing Mejzlik Props?


ORIGINAL: P-51B

I use the Dubro for the big props.

http://www2.towerhobbies.com/cgi-bin...&I=LXD712&P=ML

Will this one handle up to 32 x 10's?
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Old 07-27-2007, 10:07 AM
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Default RE: Balancing Mejzlik Props?


ORIGINAL: sillyness
I balanced the hubs using the DOD method, works great.
What's DOD method?
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Old 07-27-2007, 10:34 AM
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Default RE: Balancing Mejzlik Props?

Download this video: http://www.dodvideos.com/don3.wmv
It illustrates the D.O.D. prop balancing method...
Ciao!
Mauri
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Old 07-27-2007, 10:52 AM
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Default RE: Balancing Mejzlik Props?

DOD is Down On the Deck
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Old 07-27-2007, 11:58 AM
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Abras
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Default RE: Balancing Mejzlik Props?

Thanks
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Old 07-27-2007, 12:51 PM
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Default RE: Balancing Mejzlik Props?

I use the Dubro balancer as well. For big props simply hang the prop over the edge of the table with some weight on the base of the balancer. The average magnetic balancers can't hold a big prop.
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Old 07-27-2007, 01:44 PM
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Default RE: Balancing Mejzlik Props?

Check this one out... a dubro variant. Does heli blades too... good for me... I'm into both.

http://www.ewtech.com/Merchant2/merc...licopter_Tools
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Old 07-27-2007, 03:10 PM
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Default RE: Balancing Mejzlik Props?

Kinky...
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Old 07-27-2007, 04:15 PM
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Default RE: Balancing Mejzlik Props?

I have the top of my workbench stock vices level, and smooooooth as a baby's butt. Put a 10mm hard tooling ejector pin in the prop hub and let it ride on the vice jaws. I switch sides and rotation direction, and get a good feel of the prop that way. No rocket science, but a snippet of paper of 1/2 square inch will turn a well balanced prop either side.
In addition to the "DOD method", I also check blade track, blade angle and blade geometry to get all dynamic properties balanced. Using Menz-S props forced me to do that, and now the habit sticks.
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Old 07-28-2007, 08:02 AM
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Default RE: Balancing Mejzlik Props?

How?
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Old 07-29-2007, 05:39 PM
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Default RE: Balancing Mejzlik Props?

I made a blade tangent angle measuring device, check both tip heights on a flat table, and draw/compare blade outlines on thin cardboard. Results on some brands are quite interesting.
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