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Offline Highonthai  
#1 Posted : Thursday, August 10, 2017 12:12:24 PM(UTC)

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Having flown with both. I'm curious as to what you all consider as to the pros and cons of each prop other than the sound factor?
Offline Mitch Johnson  
#2 Posted : Friday, August 11, 2017 9:38:38 AM(UTC)
Mitch Johnson

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I personally like a 3 blade better on my DA 170 because it has always performed the best with a Mejzlik 29x12n. I have tried 2 blades on it before and they just didn't perform as well. It wouldn't make as good of rpm's and it was mush easier to rip.
Offline Curtis Cozier  
#3 Posted : Friday, August 11, 2017 1:07:53 PM(UTC)
Curtis Cozier

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3 blade for me... quieter and for me, it seems to have a smoother application of power through the whole power band...
on a DA-170 with KS1090 pipes
Sequence Committee Member, National Judging Instructor, Wood Badge trained Scout Leader, and all around nice guy!
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Offline Orthobird  
#4 Posted : Saturday, August 12, 2017 8:46:12 PM(UTC)

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I prefer a two blade.

Well, it all depends on the application and the motor you have and the weight of your airframe.

when comparing 2 blade vs 3 blade, some factors to consider:

3 blade props can weigh more than 2 blade props, lets say, comparing a 30 x 13 evo 2 blade vs a 29 x 12 3 blade prop.

However, it is possible that a 32 x 12 may weigh more or similar to a 3 blade prop.

sound, yes, 3 blade will usually be quieter than a 2 blade, unless you are under propped, or have a monster motor, (ZDZ 180), which can rip a 3 blade as well.

Efficiency: the 2 blade prop is more efficient than a 3 blade prop.

SO in theory, a 2 blade prop should be able to push air better than a 3 blade, but this becomes more of a factor at high RPM's. Probably not a factor in our airplanes.

Ground clearance: IF you use a 3 blade, usually the diameter will be less than a 2 blade. Therefore, less likely to have problems with prop strikes (no guarantee on this now! Blushing )

I have probably over 1000 dollars in 3 blade carbon fiber props in my trailer, and I do not use a single one.

I have tried them all (the ones I own) and gone back to a 2 blade.

I have tried Mejzlik, Falcon, and Fuchs.

My assessment is, that with a 2 blade prop & my motors that I run (which are not high compression monster motors, but they are reliable), are able to perform better on uplines with a 2 blade prop. However, the down side is, I must use much better throttle control / management.

Edited by user Sunday, August 13, 2017 12:40:17 AM(UTC)  | Reason: Not specified

Wish I could fly everyday!
thanks 1 user thanked Orthobird for this useful post.
Mark Thurman on 8/13/2017(UTC)
Offline Highonthai  
#5 Posted : Saturday, August 12, 2017 10:09:46 PM(UTC)

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Thank you for taking the time to explain the differences in a easy and comprehensible manner.
thanks 1 user thanked Highonthai for this useful post.
Orthobird on 8/13/2017(UTC)
Offline Mark Thurman  
#6 Posted : Sunday, August 13, 2017 1:23:47 AM(UTC)
Mark Thurman

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I currently use a 3 blade Mejzlik 30 x 13EVO on my ZDZ-180 and it pulls very nicely while being very quiet at the same time. I have a Mejzlik 29 x 12EVO 3 blade in my trailer in case I find myself on a very hot day and want less load on the engine. I have tried Falcon 30 x 14 and 32 x 12 2 blade props and have found that they can get out of control very quickly with the 180. The throttle response is electric like, breath on the throttle and it is moving. The rpm is way to high for my liking. I was turning the 32 x 12 Falcon 2 blade at 6900, which made it very loud. The 29 x 12EVo 3 blade turns at 6650. The 30 x 13EVO 3 blade turns at 6450 to 6500. These tests were on a day when the heat index was 101 at an altitude of 1282'. I run 100LL with Redline at 32:1. When the temps cool down the 30 x 13EVO 3 blade will rip but, it is much more manageable than either of the other props.

I have tried a Falcon 30 x 13 3 blade but, it was way to noisy and would turn over 7000 easily so, it came off :)

Just some info on testing I have done. BTW, I fly a 43 lbs 3DHS 330LX and am using JMB canisters.
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