otterdriver

I was wondering what size 3 blade prop you guys are using for the 106s in IMAC. Thanks. Mark,

Baron Johnson

Generally for the 100cc class people are running 25x12 and 26x12 3 bladed props, but I've yet to see anyone flying the 3W-106.

otterdriver

Thanks Baron I was wondering with this motor because I have heard so many conflicting numbers. Some people are using props for 100s and some are pulling 120 size props.I will do some testing with the 2 blade props and figure it out from there.But this motor just got sidelined for awhile the plane I bought it for has too short of a cowl ( 2.6 composite ARF )so I am putting a ZDZ 120 in it I know it sounds heavy for that plane but I am using titanium shaft bolts and mounting bolts with a carbon spinner the motor package ends up weighing less than a DA 100 with a aluminum spinner. should work. Thanks again Mark,

quist

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the 3w will pull a 26-12

UNLDAVE

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I tried the mEjzlik 24-12 3 blade on my 106....6800 rpm. The engine revved like it didn't have a prop. I think the 25-12 fuchs is just right for the 106 but the plane will fly a lot faster than any 2 blade which will take some getting used to. I haven't talked to Tony Quist yet to see how he liked the Fuchs25-12-3 that i sold himto see how he thought it flew.

dave

quist

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Dave, I ran well on my DA 100. The 3w is a stronger engine. My 3w 100 will turn a 28 10 menz 6200 rpms. my DA 100 turns a 27 -10 6200. I have a buddy that runs a 28 10 Menz and it turns 5800.

I just ordered the spinner for the 3 blade and I will start running that prop full time. I never tached the motor with the fuchs.

Fred

My Feedback: (21)

I was running a 3w 28x10 on H9 Sukhoi (3w 100 )and was having torquing problems till Bobby told me to try his new 3 blade..it is a Engel 26x12CF ,,it stopped my torque problem and is a real quiet prop,,I lost absolutely no performance ! you can see it in my Gallery..I did have to richen my low & high needles 1/4 turn ..

Aero330LX

My Feedback: (-1)

I've seen 6700 on my DA 100 28-10 prop...it wasn't enough prop (as far as noise) and had to go with a 3 blade. It actually would pass on the ground, but in the air it would rip like crazy. Check balance on the prop on the DA, and make sure you run the oil they recomend...something don't sound right. As far as the engle props...those I would be verrrrry careful on...those are the same props that were shedding blades awhile back. And yes, I have seen a couple, but I make sure I'm not in the prop arc when they are running. The engle props also have less blade so they *DO* turn up a bit more.

quist

My Feedback: (198)

Aero330lx, what kind of tach and what brand of prop. We have alot of DA 100's in Phoenix and I have never seen one that will turn that kind of rpm. The most I have seen is 6400 with the Mejzlik 28 -10 flywheel. And that was ripping on the ground. 106 db with the pefa 2 into 1 quiet pipe at 10 feet.

Aero330LX

My Feedback: (-1)

The tachs were 3 different tachs...two photoelectric, and one disharge tach...all read within 100 r's of each other. The prop a Mejzlik 28-10. The readings (the ones I report with backed up tach's anyway) were taken after the engine had 7 gallons through it. I was trying to look up phoenix, but can't get the page to load...how high is it? There may be some a difference at ALT. I noticed in your post you said that it was ripping at 6400...that's a little hard to believe, when I see 6700 and mine meets the IMAC noise right at 98dB on the same prop, and it was tested at 987' MSL...lower MSL = higher test = louder, and more rip... lower critical mach number near sea level. I no longer run the 28-10 because it really is silly...the prop at 1/2 throttle looks like a fun-fly blasting through manuevers, and at 1/2 to 3/4 power! LOL One thing I will say is the engine has to be broken in right...if one gets impatient and leans an engine out before it has gone through initial break in, that is the r's they will get. There are some engines I have seen though, that before you went through the break in, they would spring a leak somewhere and go lean, and then that bit of patience was all for nothing. All it takes is a carb block leak, or a case leak and fly one lean run, and that engine just started running in that heat range, and the cylinders will be glazed...it's broke in folks...you don't get a second chance at a break in unless you rehone it, re ring it, and re BUILD it.

quist

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My DA has been flawless since the beginning. And so have the others at my field. My buddy finally sent his in for bearing after 700 flights. The elevation that we fly at is 1100 feet.

I broke my engine in by the book. Petrolium based oil for 5 gallons then I switched to Amsoil 50-1. I have just switched to 100-1 mixed at 85-1. It is cleaner on the plane.

When the Mejzlik prop breaks 6000 rpms it gets a high piercing noise to it. Also our field will not follow the stf distance of 25' for big engines, they say one test works for everyone. But then they exempt turbines. oh well