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HomeAircraftHelicopterHelicopter Main Discussion › OS 46 Carb
07-16-2002 03:25 PM  16 years agoPost 1
bigwave

rrApprentice

Central Illinois ( Farm Country ) , USA

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What's the number or type of carb NOW on the OS 46. The one that works correctly, not the old style with the mid-range problem.

And

Is the OS 50 really that much better than the 46.
Assuming both engines run perfectly is the 50 really worth the extra $70.

Thanks

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07-16-2002 05:33 PM  16 years agoPost 2
pipercopter

rrApprentice

Riverside, California

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It depends on what helicopter you're installing the 46 on and the kind of flying you're into. I have a 46 on a Raptor short boom conversion ( 8.5:1 gear ratio, short boom with 550mm blades). The machine has more than enough power to do anything you want. The OS 50 would be ideal on machines using 600MM blades. Use a governor to keep it from overspeeding. The extra power on the 50 will keep it from bogging down on just about any maneuver you can think off. With the governor, speed remains constant. The engine adding torque as needed.

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07-16-2002 05:55 PM  16 years agoPost 3
bigwave

rrApprentice

Central Illinois ( Farm Country ) , USA

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Type of Heli
I'm thinking about a JR Voyager 50 w/600mm blades for a second heli.
I'm just now learning inverted hover. Right now I do flips, rolls, loops, stall turns etc. but, with my JR Venture 32 if I do more than one or two manuvers in a row the head speed really starts to lag.
So what do you think?
Should I go with the 50?

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07-16-2002 06:01 PM  16 years agoPost 4
pipercopter

rrApprentice

Riverside, California

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For the Vger 50 go with the OS50 and install a governor.

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07-17-2002 01:35 AM  16 years agoPost 5
Syclic

rrApprentice

Northern Hemisphere Ont.

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46/50
Bigwave,
As mentioned earlier a lot depends on the heli relating to the weight of it (for desired power to weight ratio) e.g. My Falcon SE V2 weighs in at 7.5 lbs RTF without fuel (about the weight of the JR Venture 30) and another 46/50 size I have weighs in at 8.8 lbs without fuel. Heli B is 18% heavier then my Falcon. So if the 50 is in B and the 46 is in the Falcon (assuming the 50 produces 18% more power then the 46, which under ideal circumstances it does) then they will both have very similar power performance.

Assuming they are both using 600mm mainblades (the minimum required to load either engine properly) and if we look at the "unpowered" scenario (in an autorotation) then the lighter Falcon has an 18% advantage. Why, because they both will have about the same disc area but the lighter Falcon will have a much lighter disc loading.

Now, putting the 50 in the lighter Falcon will give me an 18% power loading advantage over B with the 50 . And because the difference in weight between the two engines is marginal I will still retain the light disc loading advantage for the autorotations.

I have owned and operated both these engines and find both equally easy to set and use when mated to the proper size (600mm plus) mainblades, using the proper gear ratio and an appropriate high volume tuned muffler system.

So if you want a relatively heavy 50 class heli to perform like a 60 size in power then get the 50 (it still won't auto like a 60 though). But if you have a lighter design like the Falcon SEV2, then the 46 will give you a similar power to weight ratio as that of a 60 and the light disc loading will give you the autorotation characteristics of a 60. (The 50 in this lighter design will give a power loading similar to a 60 size with an 80 or 90 in it.)

Conclusion, If you have a heavier design, the extra cost of the 50 would be better spent then on a lighter design.

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07-17-2002 02:04 AM  16 years agoPost 6
Scotty740

rrApprentice

Nashport, Ohio

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Bigwave,

To answer the first part of your question:

There are the numbers 1 or 2 on the OS 46 carbs. This has nothing to do with the presence of the new or old type spraybar. There have been carbs with the number 1 with the new type spraybar as well as the number 2 carb.

The only way to tell is to pull the carb off and look in the bottom and see if there is an oval shaped slot in the spraybar as opposed to a slot with straight sides.

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07-17-2002 02:10 AM  16 years agoPost 7
Buzzin Brian

rrProfessor

College Station, Texas

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So which of the two is the new design? The oval, or the slot? I am thinking about getting a 46 for my Raptor as well. And would like to know.

Thanks

Build it, fly it, crash it. Repeat as often as needed.

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07-17-2002 02:22 AM  16 years agoPost 8
Scotty740

rrApprentice

Nashport, Ohio

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The oval slot is the correct one. There is a longitudinal slot in the spraybar with a v at each end. The new spraybar has an oval area in the center. The old type had straight sides on the slot.

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07-17-2002 02:48 AM  16 years agoPost 9
Optech

rrKey Veteran

San Diego, CA.

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If you get the .46 go with 580mm blades. Anything else and the motor is a dog unless you are so super smooth through every manuver everytime. You wont auto as well but the motor will recover faster if you bog it. My Falcon with a .46 and the 580s is really fun to fly. Now if the mechanics weren't so crappy it would be a perfect ship. Also, Between a buddy and I, we've tried just about every muffler and agree that the KSJ competition is the best. Another buddy has a .46 in his Sceadu and decided to go to the glass 570s. Makes since because that ship is a tad heavier and is easier to bog the motor. His disk loading is higher now so its a catch22 situation but its working for him. Those blades are semis so the extra lift probably makes up for it.

Hope this helps,
Mike

Viva La Airtronics!

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07-17-2002 03:25 AM  16 years agoPost 10
Safe_Cracker

rrKey Veteran

Chicago, IL

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Here we go.....
The OS 46 fxh uses a 40c carburetor.The difference between the old and the new is just a newly designed spraybar focused on idle quality.I got this engine with a used heli and it has the oval spraybar with a tiny hole on the left side(towards the fuel inlet nozzle on the carb body) of the oval end.If this is the new spray bar then someone screwed up and drilled the small hole modification for no reason at all.If someone has a picture of the new spraybar could you please post it so we would know what to look for..

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07-25-2002 07:24 AM  16 years agoPost 11
Buzz1167

rrApprentice

Somewhere over the Rainbow

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Yes, plz post a picture if you have one, I have the (old 46) with the flat sided spray bar. Anyone know of anything I can do to get the new spraybar, (or modify mine) Short of buying a new carb.
I have the problem of the Low end having to be pretty lean to get the engine to run at all, but I want to richen up the low end to get rid of the overspeeding and (wah wah) with my undersized blades.
If its not lean on the low end it wont even put out as much as my os32, it'll take off and seem like its got power (the high end has to be 1/2 out or so), but when I punch it, it'll go up quick then loose power fast and start coming down. Is this the dreaded (midrange problem)?? Low end lean so the high end can be rich enough to fly? PLZ tell me it is.

Thanks in advance,
Buzz1167
Jon N

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