How will an APC 12.25 X 3.75 prop work on an os 46 fx. It will be installed on a great planes dazzler. Thanks

i have seen that one a the 11.5 x 4 do wonders on that motor...

That's a perfect prop for that motor!

Mike

I agree that both will do well....IMNSHO the 11.5X4 will give you the quickest spool up of the two.

I have the 12.25x3.75 on my Magic right now and it just doesn't have the transition it needs.

I'm going to start cutting down the prop a 1/4 inch at a time as I like the 3.75 pitch but it's just a bit too much prop for this engine.

ALSO, I had the .46fx on my Dazzler ARF (RIP) before the Magic and I found the 11x5 APC to be the best combo. For some reason the Dazzler liked the airflow better than the 11/4 or 12/4.

Note, all props are APC.

I played around with a bunch of props on my Cap 232 with the 46 fx engine. I ended up using the graupner 12 X 5 with my combination.. It is important to note however that I fly at 5600 feet in elevation. good luck and don't be afraid to try a bunch of different prop sizes, pitches, and manufactures.

FW

Hey Crash90
I have a OS 46 FX and a APC 12.25x3.75 prop on a FF and the combo Is aewsome. Very easy to hover!

Doug

APC 11x7 seems to be the magic prop for the OS .46 FX on my US.

APC 11-5 is the best prop I ever had on my OS46. It was good for everything from reasonable speed charactersistics, outstanding practically unlimited climb power, and could hover a 5.25lb plane pretty well - but climb out speed from hover was minimal at that weight.

I tried the 12.25-3.75 and it felt sluggish in flight compared to the 11-5.

I have this prop on my .46 fx and it works great...I use %15 powermaster fuel...If you use 10% I think that the 11x5 might be a better choice...I also am using a Tower Hobbies muffler

I think the 12 1/4" x 3.75 is too much prop for the O.S. 46fx. Doesn't let the engine turn up, where these engines like to run. I have seen this used on the newer O.S. .50 and I think it is a much better prop for that engine.

I have had good success with the following props.

Apc 11.5x4 (Probably my favorite)
Apc 11x5 (2nd choice)
Zinger 12x4 (3rd choice)

Hey Daven
I'll have to tach the prop in the next day or so because my 46 FX screams with the 12.25x3.75 APC using S&W 10% 50/50. This prop Is for low and slow/hovering, not speed!!!


Doug

Here's a tip...if you have not tried a 11.5X4 APC I suggest you do so before you comment on what the best prop is for a given engine.

Sure the 12.25X3.75 is a great prop and preforms fine. What your missing however, is the spool up time. Think about it. A shorter prop spools up quicker.....what do you want in a hover?

A prop that responds as quick as possible, ergo the 11 inch VS the 12.25 is a no brainer.

Just try it, then comment on your objective results.

Besides, since when do you only have one prop size in your prop collection?

I tried the 12.25x3.75 prop on my thunder tiger 46 w/ stock muffler and baffle removed. It would turn the prop fine, but it was sluggish on spool up.

I had it on for about 2 minutes during a flight, I landed and switch props. I have read that some people have great success w/ 12.25 prop. but others do not. Could be the altitude, fuel, etc.

but I have tried the 12.25 on a ST45 w/ stock muffler, and a TT46 w/ stock muffler w/ baffle removed. And I didn't like it. I swapped back to a 11x4APC.
But I use 11x4APC, 11x5APC, 11x4.5APC. that is what works best for me.

Also tried the 12.25 on my brother OS46 and his magic, hated it. Swapped back to 11x4.5APC. Turn it great, but spool up to slow. But w/ a 11x4.5, throttle transistion was instant. Vertical pull was better to. Hovering was easier, because I could bump the throttle and motor would increase instantly.

I have a friend that has 2 of the same brand and size motors, w/ same fuel, on same day, 1 would spin the 12.25 great, and the other was sluggish.

I don't think that anyone has only one prop in their prop collection....I have not tried the 11.5x4 and was not commenting on it....I have tried the 11x5 on my freestyle and love it...I have 12.25x3.75 on my Ext 330 and it does great but it is a lighter and smaller airframe....I would suspect that the 12.25 may be too much prop for this application....I would agree that this all comes into play when selecting a prop....I also think that weather conditions and fuel do make a difference IMO

Howdy,

I recently started playing around with different prop sizes on my 46fx, (stock muffler and baffle in tact) which is on a World Models Super Stunts 40 (ugly stik variant).

If you can, get every prop size that is safe for the 46 and try it. In short order you'll find the perfect one and probably one or two variables that will work better in different scenarios = wind, humidity, temperature and your general flying attitude for the day.

I have found three for my super stunts, 10x7 for mock pylon racing with my friend who has an Ultra Stik 40, 11x6 slower than the 10x7 better vertical and more of a on rails tracking, nice looking split S's and Hammerheads. Last but not least a 12x4. The 12x4 is my favorite. It seems to give the motor a very linear 4 stroke throttle response, unlimited vertical, and slow in your face flying. I can get away with a lot of dumb thumb showing off with this prop. Also for what it's worth, my motor likes the wood props better than the APC of the same size.

I know you can't compare the the two planes to each other, But I think to many people are stuck on one prop size. Since I have done this I feel like I have three different airplanes in one.

Well... put me down as one who probably prefers the 11.5 x 4 but it is close. Before going with a Saito .72 on my Dazzler, I ran a .46FX and alternated between the 11.5 x 4 and the 12.25 x 3.75 (whew, not much clearance).

The 11.5" definitely spools faster and many times gave better results over all. Part of it would depend on engine performance related to weather conditions - winter or summer.

If I could only have 1, I would take the 11.5

Photo (pre-APC)

The APC 12.25x3.75 is too much prop for a stock 46FX. Check the revs. The 46FX really wants to be spinning at least 12.5k rpm (it's even better at 13-15k rpm) WOT. But the stock exhaust on the 46FX is really restrictive. Put a tuned pipe (i.e. MCP), and the 46FX power increases dramatically. In doing some preliminary test, I've been able to spin the same APC 12.25x3.75 1500 rpm faster (12k vs 13.5k rpm) through the use of the Morris/Rossi pipe combo. The engine spins up (transitions) much faster as well.

For me, the 12.25 x 3.75 was the perfect fit for my STOCK 46fx on a somethin extra. That engine is on a canard, and now likes an 11 x 5. But no way is that prop too much, that's what it was defined by. My OS 50 loves it too, though I haven't had time to try many props. Now my SE goes up as fast as it goes horizontal!

Gordon

Hello,

I am a beginner flyer with an Global RCM 40 Trainer with an OS 46FX. After reading all the threads on different props for this engine, yesterday I changed my Master Airscrew plastic 11X6 prop for a Tornado plastic 12X4 prop to see how it would fly. My LHS didn't have a MA or APC brand 12X4.

My plane flew noticably slower with the 12X4 than with the 11X6. For example, on final approach, I had to maintain one or two clicks of throttle with the 12X4 where with the 11X6, I would have already pulled back to idle. Pulling all the way back to idle with the 12X4 did indeed have a breaking effect. Pretty cool if you ask me! My plane also seemed to climb better with the 12X4 than with the 11X6. The top end speed is slower with the 12X4 than with the 11X6, which is just fine with me at this point in my flying. I felt that the 12X4 gave me better low speed control over the 11X6, especially on landings, which I liked. Finally, on the ground and in the air, the RPM range seemed fine with the 12X4, although this is based on my limited experience and without a tach.

In summary, it would seem to me that a beginner flying a trainer with an OS 46 FX, and probably other engines as well, might benefit from a relatively larger prop with a smaller pitch. Thoughts?

Thanks for all the posts on this subject. It has been fascinating and I never would have tried this prop had it not been for the posts.

Travis

Use low diameter/high pitch props for speed and high diameter/low pitch for FunFlying(hoovering) :stupid:

I use 10*6 Apc in my pylon(O.S46fx stock muffler) and 12.25*3.57 Apc in fun fly use.

check out this prop chart

Interesting conversations, and it boils down to try more than one prop, as someone has already stated.

I have a lot of fun with a Morris Hobbies Spinsation using a 11/4 APC on a .46 O.S. FX.

I tried several props and settled on this one.



Great Hobby we have. There's something in it for everyone.

Just remember, all of our RC toys have unknown expiration dates.

Regards, FRED