gabe200

My Feedback: (21)

whats a good prop for os120 fse i have 2 props to try a 16x6 and a 15x6 this is on a 1/4 scale tri pacer will the 16x6 overload my engine

Flyboy Dave

My Feedback: (21)

Power Output: 1.9 BHP at 11,000 RPM
Weight-Without Muffler: 30.5oz (864g)
Weight-With Muffler: 33.3oz (944g)
Practical RPM Range: 2,000 - 11,000 RPM

I would prop it for 10,000 rpm on the ground, then richened to about 9500 for flight. If it
won't peak to 10,000....I would say it is over-propped.

FBD.

maukaonyx

I'm running that engine on my CG Ultimate bipe with a Master Airscrew 16x6. It runs great and pulls the bipe with unlimited vertical. The prop does not bog the engine down. I forget what RPM it tachs out at. Jon

David Bathe

You don't want that engine hitting the 10's way too many R's.
16x6 MAS CLassic is what I used.
What a great sound it made also.

Don M.

My Feedback: (5)

I've been running a 120E for 400 flights. I use an APC 15-8 and it's perfect fo the plane ( Venus II ). It turns 9200 after riching it a bit and I agree 10,000 static for this engine is toooo high. I've tried a 14-10 & a 16-6 but keep coming back to the 15-8. I found the plane too fast with the 14-10 and over reved on turns with the 16-6. The 16-6 is not too much prop, but in my case I found it useless on this plane, all revs and no power.

jaka

Hi!
In a slow flying Cub type plane the 16x6 is the best prop. avoid Master A props with white tips as these are noisy and doesn't give as good performance as APC, RAM, Bolly, Menz or Graupner cam-props.

David Bathe

Absolutely.
As stated a 16x6 in that plane will be very nice.
I normally stay as far away from MAS props as possible.
But for that plane/engine, the MAS Classic 16x6 will be wonderful.
It's such a fat (and dreadfully in effect prop compared to a APC) that it makes a WONDERFUL sound when coupled with that engine.
That airframe/engine/prop combo... made in for each other mate.
Trust me, if you're not utterly delighted... I'll never post a suggestion again!
What ever... 16x6 is the prop for that plane/engine IMO.

Flyboy Dave

My Feedback: (21)

....I wonder what OS Engines means by "practical RPM range"?

O.S. FS-120S-E, Practical RPM Range: 2,000 - 11,000 RPM

O.S. FS-120 III Surpass, Practical RPM Range: 2,000 - 12,000 RPM

I will notify OS Engines first thing Monday morning and let them know they must not
know how to run these engines....what are they thinking ???

FBD.

gabe200

My Feedback: (21)

ill try the prop and see what happens this will only be ground testing im still working on my wing thanks fo all the great info