IMAC Prop Selection????
OK, I've moved up to a 42% extra 260 powered with a DA170 on MTW 110 cans. Man what a stump puller that engine is!!!!
Question is, now that I am through the break-in on the engine, what prop should I be using? Don't plan on any 3D stuff, just IMAC. I don't what to have to take out another loan against the house (did that for the plane and engine) trying a bunch of props, so thought I would ask. Would like to use a 3-blade like I had on my 33% CA, just not sure what size. Suggestions?????? Thanks, Tom |
RE: IMAC Prop Selection????
Tom,
I'm using a 29x12 Mejlik<sp> 3-blade on a 42lb Jtec with the same exhaust setup. Nice and quiet and still more than enough power for the uplines with 2 snaps. I suspect that once I get another 5 gallons through it I'll be changing out to a 30x12 3-blade as I can rip the 29x12 if the air is cool enough and I'm only 7 gallons into the engine A good 30x13 2 blade works fine but you can rip that one pretty good |
RE: IMAC Prop Selection????
Thanks Bill,
I have been running Biela props on my BME110's and have really liked the down line breaking that they give. I just hate to have to spend $150+ on a prop and then not like it! My plane is at 41#'s that 170 pulls it like it is only 30! I debated on the 150, but figured I can alway throttle back! Thanks again. |
RE: IMAC Prop Selection????
Tom,
Sorry, I cannot give you any input on the Biela. I know a few that use them and love them but no one on a DA170. I suspect that since they are a wider/thicker blade you might be better off with something 3-Blade in the 28 inch range. That would keep the RPM's up and allow for a better upline and still have the downline braking |
RE: IMAC Prop Selection????
ORIGINAL: tburndrett Thanks Bill, I have been running Biela props on my BME110's and have really liked the down line breaking that they give. I just hate to have to spend $150+ on a prop and then not like it! My plane is at 41#'s that 170 pulls it like it is only 30! I debated on the 150, but figured I can alway throttle back! Thanks again. Now...like you Tom, I'm looking to change back to a 3 blade prop as the 2 blade prop is too "instantaneous" on the throttle. I would highly suggest to keep looking for the best 3 blade prop... I have not found it as yet. Wayne |
RE: IMAC Prop Selection????
Hey Wayne,
Met you at the Nats a couple years ago. How is it going? Thanks for the input. One additional question, how has your idle been on the 170? I have trouble getting a good reliable idle that is low enough for landing. I am hoping that moving to a larger/heavier prop will help. The problem I have is that the TT-TOC Extra260 just doesn't want to stop flying unless the idle is 1200 or less! Of course, getting use to the landing speed on the 42% plane vs the 33 is taking a little adjustment for the pilot as well. I have a little over 10 gallons through the engine at this point and the idle is getting better. Transition is great and smooth throughout the RPM range. Just wondering. Keep Flying.... Tom |
RE: IMAC Prop Selection????
Hey Tom...the idle is extremely slow & smooth.... I hope you have got all the updates on the 170? I use a solid backplate TruTurn spinner, so it helps to smooth out the idle. You can slow down the airplane with the elevator & use the throttle to vary the altitude...
Wayne |
RE: IMAC Prop Selection????
Hey Tom,
Did you find the prop? Probably not just wondering. Still waiting for warmer days. |
RE: IMAC Prop Selection????
ORIGINAL: vbortone Hey Tom, Did you find the prop? Probably not just wondering. Still waiting for warmer days. Wayne |
RE: IMAC Prop Selection????
I have decided to go with the 29X12 as well. It should be here by the end of the week. I too am using a sold backplate on my spinner (TruTurn). What are the updates you are referring to on the engine? Mine is less than a year old, so should be the latest and greatest. At least it hasn't given me any problems after 99 flights.
Now, if only the weather would warm a little - I just can't bring myself to go to the field with temps below freezing! Let you know how it turns out. Tom |
RE: IMAC Prop Selection????
If you watch your throttle a Mej 30x13 is one of the best. Assuming it doesn't delam.
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RE: IMAC Prop Selection????
ORIGINAL: nmking09 If you watch your throttle a Mej 30x13 is one of the best. Assuming it doesn't delam. I tried the 30x13 Mejzlik 2 weeks ago & it was a noisy prop for IMAC. Even with throttle management you will have trouble with sound. The 29x12N is the best I have found up to now. Look on the Hall sensor pick-up. Is it turned all the way to the left (retarded)? There were updates to head bolts & other internal areas that are significant. Give Tony a call at Desert Aircraft & let him tell you if your engine has the updates. I am sure they would have it on file. Wayne |
RE: IMAC Prop Selection????
Wayne,
Yea, I checked and mine is retarded as far a possible. Is that part of the update? I'll try to call Tony tomorrow and check. Thanks, Tom |
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