STLPilot

My Feedback: (21)

I have an MVVS 2.15 with tuned pipe. Mounted on OMP Profile Edge 80". Looking for best prop fit for 3D'ing. Or if you have it mounted on any 3D type plane. Looking for best torque.

PLEASE ADVISE !

THANKS!

[email protected]

STLPilot

My Feedback: (21)

Still looking for help!

ballistic1

My Feedback: (27)

Well thats a good one ! I had a OMP540gs with a moki 210. the only prop I found with a large diameter and low pitch was a zinger 18-6
Its the lowest pitch -big diameter prop. you can find from anyone
I wish APC would make a 20-4 as this IMHO would have been perfect for this engine,airframe combination
hope this helps
Frank

alyohagg

Maybe MenzS 20x6?

STLPilot

My Feedback: (21)

I have been looking for a 20x4 or 21x4 or 22x4 ... no luck???

Anyone ever see?

bn120

My Feedback: (1)

Nope and I do not you will ever find a commercially available one because with these big props anything over 7500 and they start breaking the sound barrier at the tip and it causes some major harmonics and keeps the prop from running at peak performance.Even if they made one and you ran it at 7500 rpm your top speed would be just above a stall speed.

Darin

STLPilot

My Feedback: (21)

I don't mean to sound condescending but could back up your theory with a location that I could read about that on the net somewhere. Relatively speaking what would be the difference in length of the prop vs the pitch as compared to say a 12.75 x 3.75 on a .46 FX engine.

Your theory makes sense, of course, then they would make low pitched props for us 3D'ers if they would work, but they do not, so something is holding them back.

Just would like to read more about it if you have the info.

THANKS!

Hobbsy

My Feedback: (102)

Zinger list a three blade 18x5 and a 20x5, the 18x5 three blade should be the approximate equivalent of a 20x4 two blade.

STLPilot

My Feedback: (21)

Again, sounds like a good theory ... but is there any docs that state that?

THANKS!

Crash90

My Feedback: (17)

I will be building the same setup so I am also curious to know. If you search OMP there are people using 22x6 on their Mokis. Maybe you can track them down and see where they're getting them.

Hobbsy

My Feedback: (102)

Zinger lists a ProZinger in the 22x6 size. "www.zingerpropeller.com"

bn120

My Feedback: (1)

Ok lets see if I can explain it

12x4 prop at 14000 on a 46 fx about 53 mph

12x4 prop at 7000 on a 46fx about 26 mph

so if you needed to get to 53 mph at 7000 rpm you would need 8 pitch prop

The limiting factor is most gas engines produce most hp around 6500 for big ones and 9000 for smaller in relation a smaller prop on the smaller engines can rev higher without breaking the sound barrier.

so to sum it up a 20x4 prop would have to turn 14000 rpm to go 53 mph

Darin

capthis

My Feedback: (67)

Ok I have read this and I want to ask one question. What was wrong with the 22-6 pro zinger that was on the engine when I sold it. It was a hovering fool with that prop and had very good pull out. I don't think you are going to find some "magic" prop for the thing. That one worked very well or at least I thought so. I guess I don't get what you are trying to improve?

capthis

My Feedback: (67)

Oh and by the way that mvvs 2.15 was turning the 22-6 pro zinger at 7400. I wonder how this compares with the moki's?

Crash90

My Feedback: (17)

Capthis, I am about to start the same project and I haven't ordered an engine yet. How would you rate the MVVS on the OMP. How was the pull out from a hover?

capthis

My Feedback: (67)

Very good. It would hover well below half throttle, and the pull out was vey strong. If I were building another one, I would go with the mvvs and pipe combo again.

STLPilot

My Feedback: (21)

Absolutely nothing wrong with the prop. Since it's a 2 stroke engine I am just trying to get as much torque out of it as possible and seeing whatever anyone else is using.

Antique

My Feedback: (4)

You might give PK props a call..Phil Kovar, 785 238 1679..
Very nice props, reasonable prices, any size wood, from 14 to 36 diameter, 2,3 and 4 blade...
They don't turn as fast as some, but pull like crazy...Been there....

Hobbsy

My Feedback: (102)

Fox Mfg. has some of the PKs in stock, I have several and can vouch for their quality.