Stuka Stunt Main Forum · 25 of 25 known posts recovered
When the character of a man is not clear to you, look at his friends.
Japanese Proverb
The following was posted by Steve Moon on another thread.
L L: It would be hard to go wrong with the OS LA 46. It is a great running motor, and it is a great deal.
We have run several of these down here in Dallas, and had good luck with all of them. We use the APC 12.25 x 3.75 CL prop (usually available at your LHS, as it is very popular with the RC Fun Flyers) cut down to 11.75". We also have tried just about every muffler imaginable and have had our best result with a tube muffler such as Randy Smith or Richard Oliver sells. We use a Sllivan RST 6 oz. tank with pressure. Run the motor just short of a steady 2-cycle and it will perform exactly the same every time. Hours and hours of troublefree and hasslefree use.
Later, Steve
The following was posted by Patrick Rowan on another thread.
After trying a number of different prop MFGs & sizes I've found the Bolly 12x4 CF to be the best prop for my LA .46s. Launch a little over 10,000 rpm.
When the character of a man is not clear to you, look at his friends.
Japanese Proverb
Thats why you get a Lettered set.
When the character of a man is not clear to you, look at his friends.
Japanese Proverb
I have a T&L ST46 and the OS46LA. Without a doubt the OS has the edge on raw power. The power band is very broad.
I used a profile Cavalier as a test bed. I ran a OS40FP, ST46 & OS46LA. The ST46 & the OS40FP were similar in power
The ST would fly the Cavalier on 4.5 ounces of fuel with a zinger 11/6 prop on a 4-2-4 break. The full pattern was not a problem and good line tension everywhere, 5.3 second laps.
The OS40FP would fly the Cavalier on 4.5 ounces of fuel on a Zinger 12/6 prop, 4-2-4 break, 5.7 second laps, excellent line tension and a full pattern, no problem.
The OS46LA would fly the Cavalier on 4.5 ounces of fuel however you could not waste a step of fly an extra lap. I used a zinger 12/6 and a 13/5 prop. The airframe was so over powered that most of the flight was flown 4 stroke only, 6 second plus laps. You could almost go to sleep during the Square 8 maneuver. All verticle maneuvers were slow and powerful.
The OS46LA is a powerful engine, in the right airframe it would be a winner. I would love to build a Tom Dixion Nakke and power it with a 46LA.
I'll see you in Atlanta in the fall.
Mike Clark
You can assuredly find a detailed answer in the threads.
Bigs
On my ST 46 I use 5 1/2 oz. at 15% nitro for the pattern. On my OS 46 powered Cardinal (Profile) I do the pattern with 4 oz. at 10% nitro and have enought left over for about 5 level laps.
I have flown with both and like both. I like the Tigre from a classic stand point but like the LA for cost and ease of operation. I have mine in a profile with 587 sq/in span and 44 ozs. I use an APC 11x5 most of the time with 9.6k release and use the OS large venturi and NVA. It flies with authority on just under 4 ozs with about 10-12 laps after the pattern. Mine took a long time to really break in and now just hums along. I should get the first flight on my new Tempest 40 this weekend and am installing this engine in the plane. I'll let you know how it goes.
Mike Clark
Ask Carl Shoup about his LA46. Seems to run pretty much like an ST46...on steriods. But his isn't stock.
OS LA46s are invariably in good condition due to the un-ringed P&C and are more consistent than ST46s which commonly have tired rings (or even new standard ST rings which have poor metalurgy).
Fitted with a good well tensioned cast iron ring in a honed liner, an ST46 will out torque an LA easily and will swing a 13x5 and more. That's not a typo. 13x5 with 10% nitro pulling a 56oz 700 sq in model through the pattern 4 stroking all the way in a stiff breeze. A honed liner and a good ring is the key.
You can make rings quite easily if you have a lathe and heat treating tension into them isn't difficult but that's another topic.
Regards,
When the character of a man is not clear to you, look at his friends.
Japanese Proverb
Kind of hard to answer your question of which makes more power because I think they are close. But also because I think my ST 46 runs better than most I've seen. Mine is not special or anything it just has good compression and the venturi recommended by Brett. Mine was shall we say, lack luster until the venturi change, 10% nitro min. and I found the prop my motor likes. Now it's a great runner and I love it. Before that, any LA 46 would of blown it off. A lot of people like me expect the ST 46 to be a good runner because of it's reputation but such is not the case. It needed to be fiddled with a little to bring it into it's own. Most of the problem was me and my lack of experience. Having said all of the above, the OS LA 46 is a strong runner right out of the box (I did add one head gasket) and requires little messing with. Grins !!
Norvald Olsvold
With the LA46 flying at a two wet stroke and with a 12/4 prop I can imagine that you do have your hands full. If you engine is performing the way you like it to maybe longer lines may be the answer.
Mike Clark
NORVALDO,
I would suggest you go back to the beginning of this thread and start reading from the beginning or maybe even print it out if it's easier for you to read. There are several props recommended for you to use that are successful. None of which are of the Master type. Do not try to reinvent the wheel. The work has been done. If you follow the setups and the props listed you will be successful. There may be other problems with your setup, but start with what has already been proven and work from there. Good Luck!!!
Norvald Olsvold
Yes, It was printed in Stunt News (PAMPA) also.